mirror of
https://github.com/samba-team/samba.git
synced 2024-12-23 17:34:34 +03:00
b220162824
We no longer have support for des encryption types in the kerberos
libraries anyway.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15237
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(cherry picked from commit 16b805c8f3
)
3724 lines
95 KiB
C
3724 lines
95 KiB
C
/*
|
|
Unix SMB/CIFS implementation.
|
|
simple kerberos5 routines for active directory
|
|
Copyright (C) Andrew Tridgell 2001
|
|
Copyright (C) Luke Howard 2002-2003
|
|
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
|
|
Copyright (C) Guenther Deschner 2005-2009
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
#include "system/filesys.h"
|
|
#include "krb5_samba.h"
|
|
#include "lib/crypto/md4.h"
|
|
#include "../libds/common/flags.h"
|
|
|
|
#ifdef HAVE_COM_ERR_H
|
|
#include <com_err.h>
|
|
#endif /* HAVE_COM_ERR_H */
|
|
|
|
#ifndef KRB5_AUTHDATA_WIN2K_PAC
|
|
#define KRB5_AUTHDATA_WIN2K_PAC 128
|
|
#endif
|
|
|
|
#ifndef KRB5_AUTHDATA_IF_RELEVANT
|
|
#define KRB5_AUTHDATA_IF_RELEVANT 1
|
|
#endif
|
|
|
|
#ifdef HAVE_KRB5
|
|
|
|
#define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
|
|
#define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
|
|
#define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
|
|
bind field, flags field. */
|
|
#define GSS_C_DELEG_FLAG 1
|
|
|
|
/* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
|
|
but still has the symbol */
|
|
#if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
|
|
krb5_error_code krb5_auth_con_set_req_cksumtype(
|
|
krb5_context context,
|
|
krb5_auth_context auth_context,
|
|
krb5_cksumtype cksumtype);
|
|
#endif
|
|
|
|
#if !defined(SMB_MALLOC)
|
|
#undef malloc
|
|
#define SMB_MALLOC(s) malloc((s))
|
|
#endif
|
|
|
|
#ifndef SMB_STRDUP
|
|
#define SMB_STRDUP(s) strdup(s)
|
|
#endif
|
|
|
|
/**********************************************************
|
|
* MISSING FUNCTIONS
|
|
**********************************************************/
|
|
|
|
#if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
|
|
|
|
#if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
|
|
|
|
/* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
|
|
* to krb5_set_default_tgs_ktypes. See
|
|
* http://lists.samba.org/archive/samba-technical/2006-July/048271.html
|
|
*
|
|
* If the MIT libraries are not exporting internal symbols, we will end up in
|
|
* this branch, which is correct. Otherwise we will continue to use the
|
|
* internal symbol
|
|
*/
|
|
krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
|
|
{
|
|
return krb5_set_default_tgs_enctypes(ctx, enc);
|
|
}
|
|
|
|
#elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
|
|
|
|
/* Heimdal */
|
|
krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
|
|
{
|
|
return krb5_set_default_in_tkt_etypes(ctx, enc);
|
|
}
|
|
|
|
#endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
|
|
|
|
#endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
|
|
|
|
|
|
#if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
|
|
krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
|
|
krb5_auth_context auth_context,
|
|
krb5_keyblock *keyblock)
|
|
{
|
|
return krb5_auth_con_setkey(context, auth_context, keyblock);
|
|
}
|
|
#endif
|
|
|
|
#if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
|
|
void krb5_free_unparsed_name(krb5_context context, char *val)
|
|
{
|
|
SAFE_FREE(val);
|
|
}
|
|
#endif
|
|
|
|
#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
|
|
const krb5_data *krb5_princ_component(krb5_context context,
|
|
krb5_principal principal, int i);
|
|
|
|
const krb5_data *krb5_princ_component(krb5_context context,
|
|
krb5_principal principal, int i)
|
|
{
|
|
static krb5_data kdata;
|
|
|
|
kdata.data = discard_const_p(char, krb5_principal_get_comp_string(context, principal, i));
|
|
kdata.length = strlen((const char *)kdata.data);
|
|
return &kdata;
|
|
}
|
|
#endif
|
|
|
|
|
|
/**********************************************************
|
|
* WRAPPING FUNCTIONS
|
|
**********************************************************/
|
|
|
|
#if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
|
|
/* HEIMDAL */
|
|
|
|
/**
|
|
* @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
|
|
*
|
|
* @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
|
|
* address from.
|
|
*
|
|
* @param[out] pkaddr A Kerberos address to store tha address in.
|
|
*
|
|
* @return True on success, false if an error occurred.
|
|
*/
|
|
bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
|
|
krb5_address *pkaddr)
|
|
{
|
|
memset(pkaddr, '\0', sizeof(krb5_address));
|
|
#ifdef HAVE_IPV6
|
|
if (paddr->ss_family == AF_INET6) {
|
|
pkaddr->addr_type = KRB5_ADDRESS_INET6;
|
|
pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
|
|
pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
|
|
return true;
|
|
}
|
|
#endif
|
|
if (paddr->ss_family == AF_INET) {
|
|
pkaddr->addr_type = KRB5_ADDRESS_INET;
|
|
pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
|
|
pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
#elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
|
|
/* MIT */
|
|
|
|
/**
|
|
* @brief Stores the address of a 'struct sockaddr_storage' a krb5_address
|
|
*
|
|
* @param[in] paddr A pointer to a 'struct sockaddr_storage to extract the
|
|
* address from.
|
|
*
|
|
* @param[in] pkaddr A Kerberos address to store tha address in.
|
|
*
|
|
* @return True on success, false if an error occurred.
|
|
*/
|
|
bool smb_krb5_sockaddr_to_kaddr(struct sockaddr_storage *paddr,
|
|
krb5_address *pkaddr)
|
|
{
|
|
memset(pkaddr, '\0', sizeof(krb5_address));
|
|
#ifdef HAVE_IPV6
|
|
if (paddr->ss_family == AF_INET6) {
|
|
pkaddr->addrtype = ADDRTYPE_INET6;
|
|
pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
|
|
pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
|
|
return true;
|
|
}
|
|
#endif
|
|
if (paddr->ss_family == AF_INET) {
|
|
pkaddr->addrtype = ADDRTYPE_INET;
|
|
pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
|
|
pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
#else
|
|
#error UNKNOWN_ADDRTYPE
|
|
#endif
|
|
|
|
krb5_error_code smb_krb5_mk_error(krb5_context context,
|
|
krb5_error_code error_code,
|
|
const char *e_text,
|
|
krb5_data *e_data,
|
|
const krb5_principal client,
|
|
const krb5_principal server,
|
|
krb5_data *enc_err)
|
|
{
|
|
krb5_error_code code = EINVAL;
|
|
#ifdef SAMBA4_USES_HEIMDAL
|
|
code = krb5_mk_error(context,
|
|
error_code,
|
|
e_text,
|
|
e_data,
|
|
client,
|
|
server,
|
|
NULL, /* client_time */
|
|
NULL, /* client_usec */
|
|
enc_err);
|
|
#else
|
|
krb5_principal unspec_server = NULL;
|
|
krb5_error errpkt;
|
|
|
|
errpkt.ctime = 0;
|
|
errpkt.cusec = 0;
|
|
|
|
code = krb5_us_timeofday(context,
|
|
&errpkt.stime,
|
|
&errpkt.susec);
|
|
if (code != 0) {
|
|
return code;
|
|
}
|
|
|
|
errpkt.error = error_code - ERROR_TABLE_BASE_krb5;
|
|
|
|
errpkt.text.length = 0;
|
|
if (e_text != NULL) {
|
|
errpkt.text.length = strlen(e_text);
|
|
errpkt.text.data = discard_const_p(char, e_text);
|
|
}
|
|
|
|
errpkt.e_data.magic = KV5M_DATA;
|
|
errpkt.e_data.length = 0;
|
|
errpkt.e_data.data = NULL;
|
|
if (e_data != NULL) {
|
|
errpkt.e_data = *e_data;
|
|
}
|
|
|
|
errpkt.client = client;
|
|
|
|
if (server != NULL) {
|
|
errpkt.server = server;
|
|
} else {
|
|
code = smb_krb5_make_principal(context,
|
|
&unspec_server,
|
|
"<unspecified realm>",
|
|
NULL);
|
|
if (code != 0) {
|
|
return code;
|
|
}
|
|
errpkt.server = unspec_server;
|
|
}
|
|
|
|
code = krb5_mk_error(context,
|
|
&errpkt,
|
|
enc_err);
|
|
krb5_free_principal(context, unspec_server);
|
|
#endif
|
|
return code;
|
|
}
|
|
|
|
/**
|
|
* @brief Create a keyblock based on input parameters
|
|
*
|
|
* @param context The krb5_context
|
|
* @param host_princ The krb5_principal to use
|
|
* @param salt The optional salt, if omitted, salt is calculated with
|
|
* the provided principal.
|
|
* @param password The krb5_data containing the password
|
|
* @param enctype The krb5_enctype to use for the keyblock generation
|
|
* @param key The returned krb5_keyblock, caller needs to free with
|
|
* krb5_free_keyblock().
|
|
*
|
|
* @return krb5_error_code
|
|
*/
|
|
int smb_krb5_create_key_from_string(krb5_context context,
|
|
krb5_const_principal host_princ,
|
|
krb5_data *salt,
|
|
krb5_data *password,
|
|
krb5_enctype enctype,
|
|
krb5_keyblock *key)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (host_princ == NULL && salt == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
if ((int)enctype == (int)ENCTYPE_ARCFOUR_HMAC) {
|
|
TALLOC_CTX *frame = talloc_stackframe();
|
|
uint8_t *utf16 = NULL;
|
|
size_t utf16_size = 0;
|
|
uint8_t nt_hash[16];
|
|
bool ok;
|
|
|
|
ok = convert_string_talloc(frame, CH_UNIX, CH_UTF16LE,
|
|
password->data, password->length,
|
|
(void **)&utf16, &utf16_size);
|
|
if (!ok) {
|
|
if (errno == 0) {
|
|
errno = EINVAL;
|
|
}
|
|
ret = errno;
|
|
TALLOC_FREE(frame);
|
|
return ret;
|
|
}
|
|
|
|
mdfour(nt_hash, utf16, utf16_size);
|
|
memset(utf16, 0, utf16_size);
|
|
ret = smb_krb5_keyblock_init_contents(context,
|
|
ENCTYPE_ARCFOUR_HMAC,
|
|
nt_hash,
|
|
sizeof(nt_hash),
|
|
key);
|
|
ZERO_STRUCT(nt_hash);
|
|
if (ret != 0) {
|
|
TALLOC_FREE(frame);
|
|
return ret;
|
|
}
|
|
|
|
TALLOC_FREE(frame);
|
|
return 0;
|
|
}
|
|
|
|
#if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_C_STRING_TO_KEY)
|
|
{/* MIT */
|
|
krb5_data _salt;
|
|
|
|
if (salt == NULL) {
|
|
ret = krb5_principal2salt(context, host_princ, &_salt);
|
|
if (ret) {
|
|
DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
|
|
return ret;
|
|
}
|
|
} else {
|
|
_salt = *salt;
|
|
}
|
|
ret = krb5_c_string_to_key(context, enctype, password, &_salt, key);
|
|
if (salt == NULL) {
|
|
SAFE_FREE(_salt.data);
|
|
}
|
|
}
|
|
#elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
|
|
{/* Heimdal */
|
|
krb5_salt _salt;
|
|
|
|
if (salt == NULL) {
|
|
ret = krb5_get_pw_salt(context, host_princ, &_salt);
|
|
if (ret) {
|
|
DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
|
|
return ret;
|
|
}
|
|
} else {
|
|
_salt.saltvalue = *salt;
|
|
_salt.salttype = KRB5_PW_SALT;
|
|
}
|
|
|
|
ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, _salt, key);
|
|
if (salt == NULL) {
|
|
krb5_free_salt(context, _salt);
|
|
}
|
|
}
|
|
#else
|
|
#error UNKNOWN_CREATE_KEY_FUNCTIONS
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Create a salt for a given principal
|
|
*
|
|
* @param context The initialized krb5_context
|
|
* @param host_princ The krb5_principal to create the salt for
|
|
* @param psalt A pointer to a krb5_data struct
|
|
*
|
|
* caller has to free the contents of psalt with smb_krb5_free_data_contents
|
|
* when function has succeeded
|
|
*
|
|
* @return krb5_error_code, returns 0 on success, error code otherwise
|
|
*/
|
|
|
|
int smb_krb5_get_pw_salt(krb5_context context,
|
|
krb5_const_principal host_princ,
|
|
krb5_data *psalt)
|
|
#if defined(HAVE_KRB5_GET_PW_SALT)
|
|
/* Heimdal */
|
|
{
|
|
int ret;
|
|
krb5_salt salt;
|
|
|
|
ret = krb5_get_pw_salt(context, host_princ, &salt);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
psalt->data = salt.saltvalue.data;
|
|
psalt->length = salt.saltvalue.length;
|
|
|
|
return ret;
|
|
}
|
|
#elif defined(HAVE_KRB5_PRINCIPAL2SALT)
|
|
/* MIT */
|
|
{
|
|
return krb5_principal2salt(context, host_princ, psalt);
|
|
}
|
|
#else
|
|
#error UNKNOWN_SALT_FUNCTIONS
|
|
#endif
|
|
|
|
/**
|
|
* @brief This constructs the salt principal used by active directory
|
|
*
|
|
* Most Kerberos encryption types require a salt in order to
|
|
* calculate the long term private key for user/computer object
|
|
* based on a password.
|
|
*
|
|
* The returned _salt_principal is a string in forms like this:
|
|
* - host/somehost.example.com@EXAMPLE.COM
|
|
* - SomeAccount@EXAMPLE.COM
|
|
* - SomePrincipal@EXAMPLE.COM
|
|
*
|
|
* This is not the form that's used as salt, it's just
|
|
* the human readable form. It needs to be converted by
|
|
* smb_krb5_salt_principal2data().
|
|
*
|
|
* @param[in] realm The realm the user/computer is added too.
|
|
*
|
|
* @param[in] sAMAccountName The sAMAccountName attribute of the object.
|
|
*
|
|
* @param[in] userPrincipalName The userPrincipalName attribute of the object
|
|
* or NULL is not available.
|
|
*
|
|
* @param[in] uac_flags UF_ACCOUNT_TYPE_MASKed userAccountControl field
|
|
*
|
|
* @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
|
|
*
|
|
* @param[out] _salt_principal The resulting principal as string.
|
|
*
|
|
* @retval 0 Success; otherwise - Kerberos error codes
|
|
*
|
|
* @see smb_krb5_salt_principal2data
|
|
*/
|
|
int smb_krb5_salt_principal(krb5_context krb5_ctx,
|
|
const char *realm,
|
|
const char *sAMAccountName,
|
|
const char *userPrincipalName,
|
|
uint32_t uac_flags,
|
|
krb5_principal *salt_princ)
|
|
{
|
|
TALLOC_CTX *frame = talloc_stackframe();
|
|
char *upper_realm = NULL;
|
|
const char *principal = NULL;
|
|
int principal_len = 0;
|
|
krb5_error_code krb5_ret;
|
|
|
|
*salt_princ = NULL;
|
|
|
|
if (sAMAccountName == NULL) {
|
|
TALLOC_FREE(frame);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (realm == NULL) {
|
|
TALLOC_FREE(frame);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (uac_flags & ~UF_ACCOUNT_TYPE_MASK) {
|
|
/*
|
|
* catch callers which still
|
|
* pass 'true'.
|
|
*/
|
|
TALLOC_FREE(frame);
|
|
return EINVAL;
|
|
}
|
|
if (uac_flags == 0) {
|
|
/*
|
|
* catch callers which still
|
|
* pass 'false'.
|
|
*/
|
|
TALLOC_FREE(frame);
|
|
return EINVAL;
|
|
}
|
|
|
|
upper_realm = strupper_talloc(frame, realm);
|
|
if (upper_realm == NULL) {
|
|
TALLOC_FREE(frame);
|
|
return ENOMEM;
|
|
}
|
|
|
|
/* Many, many thanks to lukeh@padl.com for this
|
|
* algorithm, described in his Nov 10 2004 mail to
|
|
* samba-technical@lists.samba.org */
|
|
|
|
/*
|
|
* Determine a salting principal
|
|
*/
|
|
if (uac_flags & UF_TRUST_ACCOUNT_MASK) {
|
|
int computer_len = 0;
|
|
|
|
computer_len = strlen(sAMAccountName);
|
|
if (sAMAccountName[computer_len-1] == '$') {
|
|
computer_len -= 1;
|
|
}
|
|
|
|
if (uac_flags & UF_INTERDOMAIN_TRUST_ACCOUNT) {
|
|
const char *krbtgt = "krbtgt";
|
|
krb5_ret = krb5_build_principal_ext(krb5_ctx,
|
|
salt_princ,
|
|
strlen(upper_realm),
|
|
upper_realm,
|
|
strlen(krbtgt),
|
|
krbtgt,
|
|
computer_len,
|
|
sAMAccountName,
|
|
0);
|
|
if (krb5_ret != 0) {
|
|
TALLOC_FREE(frame);
|
|
return krb5_ret;
|
|
}
|
|
} else {
|
|
const char *host = "host";
|
|
char *tmp = NULL;
|
|
char *tmp_lower = NULL;
|
|
|
|
tmp = talloc_asprintf(frame, "%*.*s.%s",
|
|
computer_len,
|
|
computer_len,
|
|
sAMAccountName,
|
|
realm);
|
|
if (tmp == NULL) {
|
|
TALLOC_FREE(frame);
|
|
return ENOMEM;
|
|
}
|
|
|
|
tmp_lower = strlower_talloc(frame, tmp);
|
|
if (tmp_lower == NULL) {
|
|
TALLOC_FREE(frame);
|
|
return ENOMEM;
|
|
}
|
|
|
|
krb5_ret = krb5_build_principal_ext(krb5_ctx,
|
|
salt_princ,
|
|
strlen(upper_realm),
|
|
upper_realm,
|
|
strlen(host),
|
|
host,
|
|
strlen(tmp_lower),
|
|
tmp_lower,
|
|
0);
|
|
if (krb5_ret != 0) {
|
|
TALLOC_FREE(frame);
|
|
return krb5_ret;
|
|
}
|
|
}
|
|
|
|
} else if (userPrincipalName != NULL) {
|
|
/*
|
|
* We parse the name not only to allow an easy
|
|
* replacement of the realm (no matter the realm in
|
|
* the UPN, the salt comes from the upper-case real
|
|
* realm, but also to correctly provide a salt when
|
|
* the UPN is host/foo.bar
|
|
*
|
|
* This can fail for a UPN of the form foo@bar@REALM
|
|
* (which is accepted by windows) however.
|
|
*/
|
|
krb5_ret = krb5_parse_name(krb5_ctx,
|
|
userPrincipalName,
|
|
salt_princ);
|
|
|
|
if (krb5_ret != 0) {
|
|
TALLOC_FREE(frame);
|
|
return krb5_ret;
|
|
}
|
|
|
|
/*
|
|
* No matter what realm (including none) in the UPN,
|
|
* the realm is replaced with our upper-case realm
|
|
*/
|
|
krb5_ret = smb_krb5_principal_set_realm(krb5_ctx,
|
|
*salt_princ,
|
|
upper_realm);
|
|
if (krb5_ret != 0) {
|
|
krb5_free_principal(krb5_ctx, *salt_princ);
|
|
TALLOC_FREE(frame);
|
|
return krb5_ret;
|
|
}
|
|
} else {
|
|
principal = sAMAccountName;
|
|
principal_len = strlen(principal);
|
|
|
|
krb5_ret = krb5_build_principal_ext(krb5_ctx,
|
|
salt_princ,
|
|
strlen(upper_realm),
|
|
upper_realm,
|
|
principal_len,
|
|
principal,
|
|
0);
|
|
if (krb5_ret != 0) {
|
|
TALLOC_FREE(frame);
|
|
return krb5_ret;
|
|
}
|
|
}
|
|
|
|
TALLOC_FREE(frame);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief This constructs the salt principal used by active directory
|
|
*
|
|
* Most Kerberos encryption types require a salt in order to
|
|
* calculate the long term private key for user/computer object
|
|
* based on a password.
|
|
*
|
|
* The returned _salt_principal is a string in forms like this:
|
|
* - host/somehost.example.com@EXAMPLE.COM
|
|
* - SomeAccount@EXAMPLE.COM
|
|
* - SomePrincipal@EXAMPLE.COM
|
|
*
|
|
* This is not the form that's used as salt, it's just
|
|
* the human readable form. It needs to be converted by
|
|
* smb_krb5_salt_principal2data().
|
|
*
|
|
* @param[in] realm The realm the user/computer is added too.
|
|
*
|
|
* @param[in] sAMAccountName The sAMAccountName attribute of the object.
|
|
*
|
|
* @param[in] userPrincipalName The userPrincipalName attribute of the object
|
|
* or NULL is not available.
|
|
*
|
|
* @param[in] uac_flags UF_ACCOUNT_TYPE_MASKed userAccountControl field
|
|
*
|
|
* @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
|
|
*
|
|
* @param[out] _salt_principal The resulting principal as string.
|
|
*
|
|
* @retval 0 Success; otherwise - Kerberos error codes
|
|
*
|
|
* @see smb_krb5_salt_principal2data
|
|
*/
|
|
int smb_krb5_salt_principal_str(const char *realm,
|
|
const char *sAMAccountName,
|
|
const char *userPrincipalName,
|
|
uint32_t uac_flags,
|
|
TALLOC_CTX *mem_ctx,
|
|
char **_salt_principal_str)
|
|
{
|
|
krb5_principal salt_principal = NULL;
|
|
char *salt_principal_malloc;
|
|
krb5_context krb5_ctx;
|
|
krb5_error_code krb5_ret
|
|
= smb_krb5_init_context_common(&krb5_ctx);
|
|
if (krb5_ret != 0) {
|
|
DBG_ERR("kerberos init context failed (%s)\n",
|
|
error_message(krb5_ret));
|
|
return krb5_ret;
|
|
}
|
|
|
|
krb5_ret = smb_krb5_salt_principal(krb5_ctx,
|
|
realm,
|
|
sAMAccountName,
|
|
userPrincipalName,
|
|
uac_flags,
|
|
&salt_principal);
|
|
if (krb5_ret != 0) {
|
|
DBG_ERR("unable to create salt principal:%s\n",
|
|
error_message(krb5_ret));
|
|
return krb5_ret;
|
|
}
|
|
|
|
krb5_ret = krb5_unparse_name(krb5_ctx, salt_principal,
|
|
&salt_principal_malloc);
|
|
if (krb5_ret != 0) {
|
|
krb5_free_principal(krb5_ctx, salt_principal);
|
|
DBG_ERR("kerberos unparse of salt principal failed (%s)\n",
|
|
error_message(krb5_ret));
|
|
return krb5_ret;
|
|
}
|
|
krb5_free_principal(krb5_ctx, salt_principal);
|
|
*_salt_principal_str
|
|
= talloc_strdup(mem_ctx, salt_principal_malloc);
|
|
krb5_free_unparsed_name(krb5_ctx, salt_principal_malloc);
|
|
|
|
if (*_salt_principal_str == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Converts the salt principal string into the salt data blob
|
|
*
|
|
* This function takes a salt_principal as string in forms like this:
|
|
* - host/somehost.example.com@EXAMPLE.COM
|
|
* - SomeAccount@EXAMPLE.COM
|
|
* - SomePrincipal@EXAMPLE.COM
|
|
*
|
|
* It generates values like:
|
|
* - EXAMPLE.COMhost/somehost.example.com
|
|
* - EXAMPLE.COMSomeAccount
|
|
* - EXAMPLE.COMSomePrincipal
|
|
*
|
|
* @param[in] realm The realm the user/computer is added too.
|
|
*
|
|
* @param[in] sAMAccountName The sAMAccountName attribute of the object.
|
|
*
|
|
* @param[in] userPrincipalName The userPrincipalName attribute of the object
|
|
* or NULL is not available.
|
|
*
|
|
* @param[in] is_computer The indication of the object includes
|
|
* objectClass=computer.
|
|
*
|
|
* @param[in] mem_ctx The TALLOC_CTX to allocate _salt_principal.
|
|
*
|
|
* @param[out] _salt_principal The resulting principal as string.
|
|
*
|
|
* @retval 0 Success; otherwise - Kerberos error codes
|
|
*
|
|
* @see smb_krb5_salt_principal
|
|
*/
|
|
int smb_krb5_salt_principal2data(krb5_context context,
|
|
const char *salt_principal,
|
|
TALLOC_CTX *mem_ctx,
|
|
char **_salt_data)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_principal salt_princ = NULL;
|
|
krb5_data salt;
|
|
|
|
*_salt_data = NULL;
|
|
|
|
ret = krb5_parse_name(context, salt_principal, &salt_princ);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = smb_krb5_get_pw_salt(context, salt_princ, &salt);
|
|
krb5_free_principal(context, salt_princ);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
*_salt_data = talloc_strndup(mem_ctx,
|
|
(char *)salt.data,
|
|
salt.length);
|
|
smb_krb5_free_data_contents(context, &salt);
|
|
if (*_salt_data == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
|
|
/**
|
|
* @brief Get a list of encryption types allowed for session keys
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] enctypes An allocated, zero-terminated list of encryption types
|
|
*
|
|
* This function returns an allocated list of encryption types allowed for
|
|
* session keys.
|
|
*
|
|
* Use free() to free the enctypes when it is no longer needed.
|
|
*
|
|
* @retval 0 Success; otherwise - Kerberos error codes
|
|
*/
|
|
krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
|
|
krb5_enctype **enctypes)
|
|
{
|
|
return krb5_get_permitted_enctypes(context, enctypes);
|
|
}
|
|
#elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
|
|
krb5_error_code smb_krb5_get_allowed_etypes(krb5_context context,
|
|
krb5_enctype **enctypes)
|
|
{
|
|
#ifdef HAVE_KRB5_PDU_NONE_DECL
|
|
return krb5_get_default_in_tkt_etypes(context, KRB5_PDU_NONE, enctypes);
|
|
#else
|
|
return krb5_get_default_in_tkt_etypes(context, enctypes);
|
|
#endif
|
|
}
|
|
#else
|
|
#error UNKNOWN_GET_ENCTYPES_FUNCTIONS
|
|
#endif
|
|
|
|
|
|
/**
|
|
* @brief Convert a string principal name to a Kerberos principal.
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] name The principal as a unix charset string.
|
|
*
|
|
* @param[out] principal The newly allocated principal.
|
|
*
|
|
* Use krb5_free_principal() to free a principal when it is no longer needed.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_parse_name(krb5_context context,
|
|
const char *name,
|
|
krb5_principal *principal)
|
|
{
|
|
krb5_error_code ret;
|
|
char *utf8_name;
|
|
size_t converted_size;
|
|
TALLOC_CTX *frame = talloc_stackframe();
|
|
|
|
if (!push_utf8_talloc(frame, &utf8_name, name, &converted_size)) {
|
|
talloc_free(frame);
|
|
return ENOMEM;
|
|
}
|
|
|
|
ret = krb5_parse_name(context, utf8_name, principal);
|
|
if (ret == KRB5_PARSE_MALFORMED) {
|
|
ret = krb5_parse_name_flags(context, utf8_name,
|
|
KRB5_PRINCIPAL_PARSE_ENTERPRISE,
|
|
principal);
|
|
}
|
|
TALLOC_FREE(frame);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Convert a Kerberos principal structure to a string representation.
|
|
*
|
|
* The resulting string representation will be a unix charset name and is
|
|
* talloc'ed.
|
|
*
|
|
* @param[in] mem_ctx The talloc context to allocate memory on.
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[in] principal The principal.
|
|
*
|
|
* @param[out] unix_name A string representation of the princpial name as with
|
|
* unix charset.
|
|
*
|
|
* Use talloc_free() to free the string representation if it is no longer
|
|
* needed.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
|
|
krb5_context context,
|
|
krb5_const_principal principal,
|
|
char **unix_name)
|
|
{
|
|
krb5_error_code ret;
|
|
char *utf8_name;
|
|
size_t converted_size;
|
|
|
|
*unix_name = NULL;
|
|
ret = krb5_unparse_name(context, principal, &utf8_name);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
|
|
krb5_free_unparsed_name(context, utf8_name);
|
|
return ENOMEM;
|
|
}
|
|
krb5_free_unparsed_name(context, utf8_name);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @brief Free the contents of a krb5_data structure and zero the data field.
|
|
*
|
|
* @param[in] context The krb5 context
|
|
*
|
|
* @param[in] pdata The data structure to free contents of
|
|
*
|
|
* This function frees the contents, not the structure itself.
|
|
*/
|
|
void smb_krb5_free_data_contents(krb5_context context, krb5_data *pdata)
|
|
{
|
|
#if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
|
|
if (pdata->data) {
|
|
krb5_free_data_contents(context, pdata);
|
|
}
|
|
#elif defined(HAVE_KRB5_DATA_FREE)
|
|
krb5_data_free(context, pdata);
|
|
#else
|
|
SAFE_FREE(pdata->data);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* @brief copy a buffer into a krb5_data struct
|
|
*
|
|
* @param[in] p The krb5_data
|
|
* @param[in] data The data to copy
|
|
* @param[in] length The length of the data to copy
|
|
* @return krb5_error_code
|
|
*
|
|
* Caller has to free krb5_data with smb_krb5_free_data_contents().
|
|
*/
|
|
krb5_error_code smb_krb5_copy_data_contents(krb5_data *p,
|
|
const void *data,
|
|
size_t len)
|
|
{
|
|
#if defined(HAVE_KRB5_DATA_COPY)
|
|
return krb5_data_copy(p, data, len);
|
|
#else
|
|
if (len) {
|
|
p->data = malloc(len);
|
|
if (p->data == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
memmove(p->data, data, len);
|
|
} else {
|
|
p->data = NULL;
|
|
}
|
|
p->length = len;
|
|
p->magic = KV5M_DATA;
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
bool smb_krb5_get_smb_session_key(TALLOC_CTX *mem_ctx,
|
|
krb5_context context,
|
|
krb5_auth_context auth_context,
|
|
DATA_BLOB *session_key,
|
|
bool remote)
|
|
{
|
|
krb5_keyblock *skey = NULL;
|
|
krb5_error_code err = 0;
|
|
bool ret = false;
|
|
|
|
if (remote) {
|
|
#ifdef HAVE_KRB5_AUTH_CON_GETRECVSUBKEY
|
|
err = krb5_auth_con_getrecvsubkey(context,
|
|
auth_context,
|
|
&skey);
|
|
#else /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
|
|
err = krb5_auth_con_getremotesubkey(context,
|
|
auth_context, &skey);
|
|
#endif /* HAVE_KRB5_AUTH_CON_GETRECVSUBKEY */
|
|
} else {
|
|
#ifdef HAVE_KRB5_AUTH_CON_GETSENDSUBKEY
|
|
err = krb5_auth_con_getsendsubkey(context,
|
|
auth_context,
|
|
&skey);
|
|
#else /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
|
|
err = krb5_auth_con_getlocalsubkey(context,
|
|
auth_context, &skey);
|
|
#endif /* HAVE_KRB5_AUTH_CON_GETSENDSUBKEY */
|
|
}
|
|
|
|
if (err || skey == NULL) {
|
|
DEBUG(10, ("KRB5 error getting session key %d\n", err));
|
|
goto done;
|
|
}
|
|
|
|
DEBUG(10, ("Got KRB5 session key of length %d\n",
|
|
(int)KRB5_KEY_LENGTH(skey)));
|
|
|
|
*session_key = data_blob_talloc(mem_ctx,
|
|
KRB5_KEY_DATA(skey),
|
|
KRB5_KEY_LENGTH(skey));
|
|
dump_data_pw("KRB5 Session Key:\n",
|
|
session_key->data,
|
|
session_key->length);
|
|
|
|
ret = true;
|
|
|
|
done:
|
|
if (skey) {
|
|
krb5_free_keyblock(context, skey);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief Get talloced string component of a principal
|
|
*
|
|
* @param[in] mem_ctx The TALLOC_CTX
|
|
* @param[in] context The krb5_context
|
|
* @param[in] principal The principal
|
|
* @param[in] component The component
|
|
* @return string component
|
|
*
|
|
* Caller must talloc_free if the return value is not NULL.
|
|
*
|
|
*/
|
|
char *smb_krb5_principal_get_comp_string(TALLOC_CTX *mem_ctx,
|
|
krb5_context context,
|
|
krb5_const_principal principal,
|
|
unsigned int component)
|
|
{
|
|
#if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)
|
|
return talloc_strdup(mem_ctx, krb5_principal_get_comp_string(context, principal, component));
|
|
#else
|
|
krb5_data *data;
|
|
|
|
if (component >= krb5_princ_size(context, principal)) {
|
|
return NULL;
|
|
}
|
|
|
|
data = krb5_princ_component(context, principal, component);
|
|
if (data == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
return talloc_strndup(mem_ctx, data->data, data->length);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief
|
|
*
|
|
* @param[in] ccache_string A string pointing to the cache to renew the ticket
|
|
* (e.g. FILE:/tmp/krb5cc_0) or NULL. If the principal
|
|
* ccache has not been specified, the default ccache
|
|
* will be used.
|
|
*
|
|
* @param[in] client_string The client principal string (e.g. user@SAMBA.SITE)
|
|
* or NULL. If the principal string has not been
|
|
* specified, the principal from the ccache will be
|
|
* retrieved.
|
|
*
|
|
* @param[in] service_string The service ticket string
|
|
* (e.g. krbtgt/SAMBA.SITE@SAMBA.SITE) or NULL. If
|
|
* the sevice ticket is specified, it is parsed (
|
|
* with the realm part ignored) and used as the
|
|
* server principal of the credential. Otherwise
|
|
* the ticket-granting service is used.
|
|
*
|
|
* @param[in] expire_time A pointer to store the credentials end time or
|
|
* NULL.
|
|
*
|
|
* @return 0 on Succes, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_renew_ticket(const char *ccache_string,
|
|
const char *client_string,
|
|
const char *service_string,
|
|
time_t *expire_time)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_context context = NULL;
|
|
krb5_ccache ccache = NULL;
|
|
krb5_principal client = NULL;
|
|
krb5_creds creds, creds_in;
|
|
|
|
ZERO_STRUCT(creds);
|
|
ZERO_STRUCT(creds_in);
|
|
|
|
ret = smb_krb5_init_context_common(&context);
|
|
if (ret) {
|
|
DBG_ERR("kerberos init context failed (%s)\n",
|
|
error_message(ret));
|
|
goto done;
|
|
}
|
|
|
|
if (!ccache_string) {
|
|
ccache_string = krb5_cc_default_name(context);
|
|
}
|
|
|
|
if (!ccache_string) {
|
|
ret = EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
DBG_DEBUG("Using %s as ccache for '%s'\n", ccache_string, client_string);
|
|
|
|
/* FIXME: we should not fall back to defaults */
|
|
ret = krb5_cc_resolve(context, discard_const_p(char, ccache_string), &ccache);
|
|
if (ret) {
|
|
goto done;
|
|
}
|
|
|
|
if (client_string) {
|
|
ret = smb_krb5_parse_name(context, client_string, &client);
|
|
if (ret) {
|
|
goto done;
|
|
}
|
|
} else {
|
|
ret = krb5_cc_get_principal(context, ccache, &client);
|
|
if (ret) {
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
ret = krb5_get_renewed_creds(context, &creds, client, ccache, discard_const_p(char, service_string));
|
|
if (ret) {
|
|
DBG_DEBUG("krb5_get_renewed_creds using ccache '%s' "
|
|
"for client '%s' and service '%s' failed: %s\n",
|
|
ccache_string, client_string, service_string,
|
|
error_message(ret));
|
|
goto done;
|
|
}
|
|
|
|
/* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
|
|
ret = krb5_cc_initialize(context, ccache, client);
|
|
if (ret) {
|
|
goto done;
|
|
}
|
|
|
|
ret = krb5_cc_store_cred(context, ccache, &creds);
|
|
|
|
if (expire_time) {
|
|
*expire_time = (time_t) creds.times.endtime;
|
|
}
|
|
|
|
done:
|
|
krb5_free_cred_contents(context, &creds_in);
|
|
krb5_free_cred_contents(context, &creds);
|
|
|
|
if (client) {
|
|
krb5_free_principal(context, client);
|
|
}
|
|
if (ccache) {
|
|
krb5_cc_close(context, ccache);
|
|
}
|
|
if (context) {
|
|
krb5_free_context(context);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Free the data stored in an smb_krb5_addresses structure.
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] addr The address structure to free.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_free_addresses(krb5_context context,
|
|
smb_krb5_addresses *addr)
|
|
{
|
|
krb5_error_code ret = 0;
|
|
if (addr == NULL) {
|
|
return ret;
|
|
}
|
|
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
|
|
krb5_free_addresses(context, addr->addrs);
|
|
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
|
|
ret = krb5_free_addresses(context, addr->addrs);
|
|
SAFE_FREE(addr->addrs);
|
|
#endif
|
|
SAFE_FREE(addr);
|
|
addr = NULL;
|
|
return ret;
|
|
}
|
|
|
|
#define MAX_NETBIOSNAME_LEN 16
|
|
|
|
/**
|
|
* @brief Add a netbios name to the array of addresses
|
|
*
|
|
* @param[in] kerb_addr A pointer to the smb_krb5_addresses to add the
|
|
* netbios name to.
|
|
*
|
|
* @param[in] netbios_name The netbios name to add.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr,
|
|
const char *netbios_name)
|
|
{
|
|
krb5_error_code ret = 0;
|
|
char buf[MAX_NETBIOSNAME_LEN];
|
|
int len;
|
|
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
|
|
krb5_address **addrs = NULL;
|
|
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
|
|
krb5_addresses *addrs = NULL;
|
|
#endif
|
|
|
|
*kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
|
|
if (*kerb_addr == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
/* temporarily duplicate put_name() code here to avoid dependency
|
|
* issues for a 5 lines function */
|
|
len = strlen(netbios_name);
|
|
memcpy(buf, netbios_name,
|
|
(len < MAX_NETBIOSNAME_LEN) ? len : MAX_NETBIOSNAME_LEN - 1);
|
|
if (len < MAX_NETBIOSNAME_LEN - 1) {
|
|
memset(buf + len, ' ', MAX_NETBIOSNAME_LEN - 1 - len);
|
|
}
|
|
buf[MAX_NETBIOSNAME_LEN - 1] = 0x20;
|
|
|
|
#if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
|
|
{
|
|
int num_addr = 2;
|
|
|
|
addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
|
|
if (addrs == NULL) {
|
|
SAFE_FREE(*kerb_addr);
|
|
return ENOMEM;
|
|
}
|
|
|
|
memset(addrs, 0, sizeof(krb5_address *) * num_addr);
|
|
|
|
addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
|
|
if (addrs[0] == NULL) {
|
|
SAFE_FREE(addrs);
|
|
SAFE_FREE(*kerb_addr);
|
|
return ENOMEM;
|
|
}
|
|
|
|
addrs[0]->magic = KV5M_ADDRESS;
|
|
addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
|
|
addrs[0]->length = MAX_NETBIOSNAME_LEN;
|
|
addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
|
|
if (addrs[0]->contents == NULL) {
|
|
SAFE_FREE(addrs[0]);
|
|
SAFE_FREE(addrs);
|
|
SAFE_FREE(*kerb_addr);
|
|
return ENOMEM;
|
|
}
|
|
|
|
memcpy(addrs[0]->contents, buf, addrs[0]->length);
|
|
|
|
addrs[1] = NULL;
|
|
}
|
|
#elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
|
|
{
|
|
addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
|
|
if (addrs == NULL) {
|
|
SAFE_FREE(*kerb_addr);
|
|
return ENOMEM;
|
|
}
|
|
|
|
memset(addrs, 0, sizeof(krb5_addresses));
|
|
|
|
addrs->len = 1;
|
|
addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
|
|
if (addrs->val == NULL) {
|
|
SAFE_FREE(addrs);
|
|
SAFE_FREE(*kerb_addr);
|
|
return ENOMEM;
|
|
}
|
|
|
|
addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
|
|
addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
|
|
addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
|
|
if (addrs->val[0].address.data == NULL) {
|
|
SAFE_FREE(addrs->val);
|
|
SAFE_FREE(addrs);
|
|
SAFE_FREE(*kerb_addr);
|
|
return ENOMEM;
|
|
}
|
|
|
|
memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
|
|
}
|
|
#else
|
|
#error UNKNOWN_KRB5_ADDRESS_FORMAT
|
|
#endif
|
|
(*kerb_addr)->addrs = addrs;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Get the enctype from a key table entry
|
|
*
|
|
* @param[in] kt_entry Key table entry to get the enctype from.
|
|
*
|
|
* @return The enctype from the entry.
|
|
*/
|
|
krb5_enctype smb_krb5_kt_get_enctype_from_entry(krb5_keytab_entry *kt_entry)
|
|
{
|
|
return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
|
|
}
|
|
|
|
/**
|
|
* @brief Free the contents of a key table entry.
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[in] kt_entry The key table entry to free the contents of.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*
|
|
* The pointer itself is not freed.
|
|
*/
|
|
krb5_error_code smb_krb5_kt_free_entry(krb5_context context,
|
|
krb5_keytab_entry *kt_entry)
|
|
{
|
|
/* Try krb5_free_keytab_entry_contents first, since
|
|
* MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
|
|
* krb5_kt_free_entry but only has a prototype for the first, while the
|
|
* second is considered private.
|
|
*/
|
|
#if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
|
|
return krb5_free_keytab_entry_contents(context, kt_entry);
|
|
#elif defined(HAVE_KRB5_KT_FREE_ENTRY)
|
|
return krb5_kt_free_entry(context, kt_entry);
|
|
#else
|
|
#error UNKNOWN_KT_FREE_FUNCTION
|
|
#endif
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief Convert an encryption type to a string.
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[in] enctype The encryption type.
|
|
*
|
|
* @param[in] etype_s A pointer to store the allocated encryption type as a
|
|
* string.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*
|
|
* The caller needs to free the allocated string etype_s.
|
|
*/
|
|
krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
|
|
krb5_enctype enctype,
|
|
char **etype_s)
|
|
{
|
|
#ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
|
|
return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
|
|
#elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
|
|
char buf[256];
|
|
krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
*etype_s = SMB_STRDUP(buf);
|
|
if (!*etype_s) {
|
|
return ENOMEM;
|
|
}
|
|
return ret;
|
|
#else
|
|
#error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
|
|
#endif
|
|
}
|
|
|
|
/* This MAX_NAME_LEN is a constant defined in krb5.h */
|
|
#ifndef MAX_KEYTAB_NAME_LEN
|
|
#define MAX_KEYTAB_NAME_LEN 1100
|
|
#endif
|
|
|
|
/**
|
|
* @brief Open a key table readonly or with readwrite access.
|
|
*
|
|
* Allows one to use a different keytab than the default one using a relative
|
|
* path to the keytab.
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] keytab_name_req The path to the key table.
|
|
*
|
|
* @param[in] write_access Open with readwrite access.
|
|
*
|
|
* @param[in] keytab A pointer o the opended key table.
|
|
*
|
|
* The keytab pointer should be freed using krb5_kt_close().
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_kt_open_relative(krb5_context context,
|
|
const char *keytab_name_req,
|
|
bool write_access,
|
|
krb5_keytab *keytab)
|
|
{
|
|
krb5_error_code ret = 0;
|
|
TALLOC_CTX *mem_ctx;
|
|
char keytab_string[MAX_KEYTAB_NAME_LEN];
|
|
char *kt_str = NULL;
|
|
bool found_valid_name = false;
|
|
const char *pragma = "FILE";
|
|
const char *tmp = NULL;
|
|
|
|
if (!write_access && !keytab_name_req) {
|
|
/* caller just wants to read the default keytab readonly, so be it */
|
|
return krb5_kt_default(context, keytab);
|
|
}
|
|
|
|
mem_ctx = talloc_init("smb_krb5_open_keytab");
|
|
if (!mem_ctx) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
#ifdef HAVE_WRFILE_KEYTAB
|
|
if (write_access) {
|
|
pragma = "WRFILE";
|
|
}
|
|
#endif
|
|
|
|
if (keytab_name_req) {
|
|
|
|
if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
|
|
ret = KRB5_CONFIG_NOTENUFSPACE;
|
|
goto out;
|
|
}
|
|
|
|
if ((strncmp(keytab_name_req, "WRFILE:", 7) == 0) ||
|
|
(strncmp(keytab_name_req, "FILE:", 5) == 0)) {
|
|
tmp = keytab_name_req;
|
|
goto resolve;
|
|
}
|
|
|
|
tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
|
|
if (!tmp) {
|
|
ret = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
goto resolve;
|
|
}
|
|
|
|
/* we need to handle more complex keytab_strings, like:
|
|
* "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
|
|
|
|
ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
|
|
|
|
tmp = talloc_strdup(mem_ctx, keytab_string);
|
|
if (!tmp) {
|
|
ret = ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (strncmp(tmp, "ANY:", 4) == 0) {
|
|
tmp += 4;
|
|
}
|
|
|
|
memset(&keytab_string, '\0', sizeof(keytab_string));
|
|
|
|
while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
|
|
if (strncmp(kt_str, "WRFILE:", 7) == 0) {
|
|
found_valid_name = true;
|
|
tmp = kt_str;
|
|
tmp += 7;
|
|
}
|
|
|
|
if (strncmp(kt_str, "FILE:", 5) == 0) {
|
|
found_valid_name = true;
|
|
tmp = kt_str;
|
|
tmp += 5;
|
|
}
|
|
|
|
if (tmp[0] == '/') {
|
|
/* Treat as a FILE: keytab definition. */
|
|
found_valid_name = true;
|
|
}
|
|
|
|
if (found_valid_name) {
|
|
if (tmp[0] != '/') {
|
|
ret = KRB5_KT_BADNAME;
|
|
goto out;
|
|
}
|
|
|
|
tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
|
|
if (!tmp) {
|
|
ret = ENOMEM;
|
|
goto out;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found_valid_name) {
|
|
ret = KRB5_KT_UNKNOWN_TYPE;
|
|
goto out;
|
|
}
|
|
|
|
resolve:
|
|
DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
|
|
ret = krb5_kt_resolve(context, tmp, keytab);
|
|
|
|
out:
|
|
TALLOC_FREE(mem_ctx);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Open a key table readonly or with readwrite access.
|
|
*
|
|
* Allows one to use a different keytab than the default one. The path needs to be
|
|
* an absolute path or an error will be returned.
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] keytab_name_req The path to the key table.
|
|
*
|
|
* @param[in] write_access Open with readwrite access.
|
|
*
|
|
* @param[in] keytab A pointer o the opended key table.
|
|
*
|
|
* The keytab pointer should be freed using krb5_kt_close().
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_kt_open(krb5_context context,
|
|
const char *keytab_name_req,
|
|
bool write_access,
|
|
krb5_keytab *keytab)
|
|
{
|
|
int cmp;
|
|
|
|
if (keytab_name_req == NULL) {
|
|
return KRB5_KT_BADNAME;
|
|
}
|
|
|
|
if (keytab_name_req[0] == '/') {
|
|
goto open_keytab;
|
|
}
|
|
|
|
cmp = strncmp(keytab_name_req, "FILE:/", 6);
|
|
if (cmp == 0) {
|
|
goto open_keytab;
|
|
}
|
|
|
|
cmp = strncmp(keytab_name_req, "WRFILE:/", 8);
|
|
if (cmp == 0) {
|
|
goto open_keytab;
|
|
}
|
|
|
|
DBG_WARNING("ERROR: Invalid keytab name: %s\n", keytab_name_req);
|
|
|
|
return KRB5_KT_BADNAME;
|
|
|
|
open_keytab:
|
|
return smb_krb5_kt_open_relative(context,
|
|
keytab_name_req,
|
|
write_access,
|
|
keytab);
|
|
}
|
|
|
|
/**
|
|
* @brief Get a key table name.
|
|
*
|
|
* @param[in] mem_ctx The talloc context to use for allocation.
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[in] keytab The key table to get the name from.
|
|
*
|
|
* @param[in] keytab_name A talloc'ed string of the key table name.
|
|
*
|
|
* The talloc'ed name string needs to be freed with talloc_free().
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_kt_get_name(TALLOC_CTX *mem_ctx,
|
|
krb5_context context,
|
|
krb5_keytab keytab,
|
|
const char **keytab_name)
|
|
{
|
|
char keytab_string[MAX_KEYTAB_NAME_LEN];
|
|
krb5_error_code ret = 0;
|
|
|
|
ret = krb5_kt_get_name(context, keytab,
|
|
keytab_string, MAX_KEYTAB_NAME_LEN - 2);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
*keytab_name = talloc_strdup(mem_ctx, keytab_string);
|
|
if (!*keytab_name) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Seek and delete old entries in a keytab based on the passed
|
|
* principal.
|
|
*
|
|
* @param[in] context The KRB5 context to use.
|
|
*
|
|
* @param[in] keytab The keytab to operate on.
|
|
*
|
|
* @param[in] kvno The kvnco to use.
|
|
*
|
|
* @param[in] princ_s The principal as a string to search for.
|
|
*
|
|
* @param[in] princ The principal as a krb5_principal to search for.
|
|
*
|
|
* @param[in] flush Whether to flush the complete keytab.
|
|
*
|
|
* @param[in] keep_old_entries Keep the entry with the previous kvno.
|
|
*
|
|
* @retval 0 on Sucess
|
|
*
|
|
* @return An appropriate KRB5 error code.
|
|
*/
|
|
krb5_error_code smb_krb5_kt_seek_and_delete_old_entries(krb5_context context,
|
|
krb5_keytab keytab,
|
|
krb5_kvno kvno,
|
|
krb5_enctype enctype,
|
|
const char *princ_s,
|
|
krb5_principal princ,
|
|
bool flush,
|
|
bool keep_old_entries)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_kt_cursor cursor;
|
|
krb5_keytab_entry kt_entry;
|
|
char *ktprinc = NULL;
|
|
krb5_kvno old_kvno = kvno - 1;
|
|
TALLOC_CTX *tmp_ctx;
|
|
|
|
ZERO_STRUCT(cursor);
|
|
ZERO_STRUCT(kt_entry);
|
|
|
|
ret = krb5_kt_start_seq_get(context, keytab, &cursor);
|
|
if (ret == KRB5_KT_END || ret == ENOENT ) {
|
|
/* no entries */
|
|
return 0;
|
|
}
|
|
|
|
tmp_ctx = talloc_new(NULL);
|
|
if (tmp_ctx == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
|
|
while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
|
|
bool name_ok = false;
|
|
krb5_enctype kt_entry_enctype =
|
|
smb_krb5_kt_get_enctype_from_entry(&kt_entry);
|
|
|
|
if (!flush && (princ_s != NULL)) {
|
|
ret = smb_krb5_unparse_name(tmp_ctx, context,
|
|
kt_entry.principal,
|
|
&ktprinc);
|
|
if (ret) {
|
|
DEBUG(1, (__location__
|
|
": smb_krb5_unparse_name failed "
|
|
"(%s)\n", error_message(ret)));
|
|
goto out;
|
|
}
|
|
|
|
#ifdef HAVE_KRB5_KT_COMPARE
|
|
name_ok = krb5_kt_compare(context, &kt_entry,
|
|
princ, 0, 0);
|
|
#else
|
|
name_ok = (strcmp(ktprinc, princ_s) == 0);
|
|
#endif
|
|
|
|
if (!name_ok) {
|
|
DEBUG(10, (__location__ ": ignoring keytab "
|
|
"entry principal %s, kvno = %d\n",
|
|
ktprinc, kt_entry.vno));
|
|
|
|
/* Not a match,
|
|
* just free this entry and continue. */
|
|
ret = smb_krb5_kt_free_entry(context,
|
|
&kt_entry);
|
|
ZERO_STRUCT(kt_entry);
|
|
if (ret) {
|
|
DEBUG(1, (__location__
|
|
": smb_krb5_kt_free_entry "
|
|
"failed (%s)\n",
|
|
error_message(ret)));
|
|
goto out;
|
|
}
|
|
|
|
TALLOC_FREE(ktprinc);
|
|
continue;
|
|
}
|
|
|
|
TALLOC_FREE(ktprinc);
|
|
}
|
|
|
|
/*------------------------------------------------------------
|
|
* Save the entries with kvno - 1. This is what microsoft does
|
|
* to allow people with existing sessions that have kvno - 1
|
|
* to still work. Otherwise, when the password for the machine
|
|
* changes, all kerberizied sessions will 'break' until either
|
|
* the client reboots or the client's session key expires and
|
|
* they get a new session ticket with the new kvno.
|
|
* Some keytab files only store the kvno in 8bits, limit
|
|
* the compare accordingly.
|
|
*/
|
|
|
|
if (!flush && ((kt_entry.vno & 0xff) == (old_kvno & 0xff))) {
|
|
DEBUG(5, (__location__ ": Saving previous (kvno %d) "
|
|
"entry for principal: %s.\n",
|
|
old_kvno, princ_s));
|
|
continue;
|
|
}
|
|
|
|
if (keep_old_entries) {
|
|
DEBUG(5, (__location__ ": Saving old (kvno %d) "
|
|
"entry for principal: %s.\n",
|
|
kvno, princ_s));
|
|
continue;
|
|
}
|
|
|
|
if (!flush &&
|
|
((kt_entry.vno & 0xff) == (kvno & 0xff)) &&
|
|
(kt_entry_enctype != enctype))
|
|
{
|
|
DEBUG(5, (__location__ ": Saving entry with kvno [%d] "
|
|
"enctype [%d] for principal: %s.\n",
|
|
kvno, kt_entry_enctype, princ_s));
|
|
continue;
|
|
}
|
|
|
|
DEBUG(5, (__location__ ": Found old entry for principal: %s "
|
|
"(kvno %d) - trying to remove it.\n",
|
|
princ_s, kt_entry.vno));
|
|
|
|
ret = krb5_kt_end_seq_get(context, keytab, &cursor);
|
|
ZERO_STRUCT(cursor);
|
|
if (ret) {
|
|
DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
|
|
"failed (%s)\n", error_message(ret)));
|
|
goto out;
|
|
}
|
|
ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
|
|
if (ret) {
|
|
DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
|
|
"failed (%s)\n", error_message(ret)));
|
|
goto out;
|
|
}
|
|
|
|
DEBUG(5, (__location__ ": removed old entry for principal: "
|
|
"%s (kvno %d).\n", princ_s, kt_entry.vno));
|
|
|
|
ret = krb5_kt_start_seq_get(context, keytab, &cursor);
|
|
if (ret) {
|
|
DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
|
|
"(%s)\n", error_message(ret)));
|
|
goto out;
|
|
}
|
|
ret = smb_krb5_kt_free_entry(context, &kt_entry);
|
|
ZERO_STRUCT(kt_entry);
|
|
if (ret) {
|
|
DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
|
|
"failed (%s)\n", error_message(ret)));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
talloc_free(tmp_ctx);
|
|
if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
|
|
smb_krb5_kt_free_entry(context, &kt_entry);
|
|
}
|
|
if (!all_zero((uint8_t *)&cursor, sizeof(cursor))) {
|
|
krb5_kt_end_seq_get(context, keytab, &cursor);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Add a keytab entry for the given principal
|
|
*
|
|
* @param[in] context The krb5 context to use.
|
|
*
|
|
* @param[in] keytab The keytab to add the entry to.
|
|
*
|
|
* @param[in] kvno The kvno to use.
|
|
*
|
|
* @param[in] princ_s The principal as a string.
|
|
*
|
|
* @param[in] salt_principal The salt principal to salt the password with.
|
|
* Only needed for keys which support salting.
|
|
* If no salt is used set no_salt to false and
|
|
* pass NULL here.
|
|
*
|
|
* @param[in] enctype The encryption type of the keytab entry.
|
|
*
|
|
* @param[in] password The password of the keytab entry.
|
|
*
|
|
* @param[in] no_salt If the password should not be salted. Normally
|
|
* this is only set to false for encryption types
|
|
* which do not support salting like RC4.
|
|
*
|
|
* @param[in] keep_old_entries Whether to keep or delete old keytab entries.
|
|
*
|
|
* @retval 0 on Success
|
|
*
|
|
* @return A corresponding KRB5 error code.
|
|
*
|
|
* @see smb_krb5_kt_open()
|
|
*/
|
|
krb5_error_code smb_krb5_kt_add_entry(krb5_context context,
|
|
krb5_keytab keytab,
|
|
krb5_kvno kvno,
|
|
const char *princ_s,
|
|
const char *salt_principal,
|
|
krb5_enctype enctype,
|
|
krb5_data *password,
|
|
bool no_salt,
|
|
bool keep_old_entries)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_keytab_entry kt_entry;
|
|
krb5_principal princ = NULL;
|
|
krb5_keyblock *keyp;
|
|
|
|
ZERO_STRUCT(kt_entry);
|
|
|
|
ret = smb_krb5_parse_name(context, princ_s, &princ);
|
|
if (ret) {
|
|
DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
|
|
"failed (%s)\n", princ_s, error_message(ret)));
|
|
goto out;
|
|
}
|
|
|
|
/* Seek and delete old keytab entries */
|
|
ret = smb_krb5_kt_seek_and_delete_old_entries(context,
|
|
keytab,
|
|
kvno,
|
|
enctype,
|
|
princ_s,
|
|
princ,
|
|
false,
|
|
keep_old_entries);
|
|
if (ret) {
|
|
goto out;
|
|
}
|
|
|
|
/* If we get here, we have deleted all the old entries with kvno's
|
|
* not equal to the current kvno-1. */
|
|
|
|
keyp = KRB5_KT_KEY(&kt_entry);
|
|
|
|
if (no_salt) {
|
|
KRB5_KEY_DATA(keyp) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
|
|
if (KRB5_KEY_DATA(keyp) == NULL) {
|
|
ret = ENOMEM;
|
|
goto out;
|
|
}
|
|
memcpy(KRB5_KEY_DATA(keyp), password->data, password->length);
|
|
KRB5_KEY_LENGTH(keyp) = password->length;
|
|
KRB5_KEY_TYPE(keyp) = enctype;
|
|
} else {
|
|
krb5_principal salt_princ = NULL;
|
|
|
|
/* Now add keytab entries for all encryption types */
|
|
ret = smb_krb5_parse_name(context, salt_principal, &salt_princ);
|
|
if (ret) {
|
|
DBG_WARNING("krb5_parse_name(%s) failed (%s)\n",
|
|
salt_principal, error_message(ret));
|
|
goto out;
|
|
}
|
|
|
|
ret = smb_krb5_create_key_from_string(context,
|
|
salt_princ,
|
|
NULL,
|
|
password,
|
|
enctype,
|
|
keyp);
|
|
krb5_free_principal(context, salt_princ);
|
|
if (ret != 0) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
kt_entry.principal = princ;
|
|
kt_entry.vno = kvno;
|
|
|
|
DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
|
|
"encryption type (%d) and version (%d)\n",
|
|
princ_s, enctype, kt_entry.vno));
|
|
ret = krb5_kt_add_entry(context, keytab, &kt_entry);
|
|
krb5_free_keyblock_contents(context, keyp);
|
|
ZERO_STRUCT(kt_entry);
|
|
if (ret) {
|
|
DEBUG(1, (__location__ ": adding entry to keytab "
|
|
"failed (%s)\n", error_message(ret)));
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
if (princ) {
|
|
krb5_free_principal(context, princ);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
|
|
defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
|
|
defined(HAVE_KRB5_GET_CREDS)
|
|
static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
|
|
krb5_ccache ccache,
|
|
krb5_principal me,
|
|
krb5_principal server,
|
|
krb5_principal impersonate_princ,
|
|
krb5_creds **out_creds)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_get_creds_opt opt;
|
|
|
|
ret = krb5_get_creds_opt_alloc(context, &opt);
|
|
if (ret) {
|
|
goto done;
|
|
}
|
|
krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
|
|
|
|
if (impersonate_princ) {
|
|
ret = krb5_get_creds_opt_set_impersonate(context, opt,
|
|
impersonate_princ);
|
|
if (ret) {
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
ret = krb5_get_creds(context, opt, ccache, server, out_creds);
|
|
if (ret) {
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
if (opt) {
|
|
krb5_get_creds_opt_free(context, opt);
|
|
}
|
|
return ret;
|
|
}
|
|
#endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
|
|
|
|
#ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
|
|
|
|
#if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
|
|
krb5_error_code KRB5_CALLCONV
|
|
krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
|
|
krb5_ccache ccache, krb5_creds *in_creds,
|
|
krb5_data *subject_cert,
|
|
krb5_creds **out_creds);
|
|
#endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
|
|
|
|
static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
|
|
krb5_ccache ccache,
|
|
krb5_principal me,
|
|
krb5_principal server,
|
|
krb5_principal impersonate_princ,
|
|
krb5_creds **out_creds)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_creds in_creds;
|
|
|
|
ZERO_STRUCT(in_creds);
|
|
|
|
if (impersonate_princ) {
|
|
|
|
in_creds.server = me;
|
|
in_creds.client = impersonate_princ;
|
|
|
|
ret = krb5_get_credentials_for_user(context,
|
|
0, /* krb5_flags options */
|
|
ccache,
|
|
&in_creds,
|
|
NULL, /* krb5_data *subject_cert */
|
|
out_creds);
|
|
} else {
|
|
in_creds.client = me;
|
|
in_creds.server = server;
|
|
|
|
ret = krb5_get_credentials(context, 0, ccache,
|
|
&in_creds, out_creds);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
|
|
|
|
/*
|
|
* smb_krb5_get_credentials
|
|
*
|
|
* @brief Get krb5 credentials for a server
|
|
*
|
|
* @param[in] context An initialized krb5_context
|
|
* @param[in] ccache An initialized krb5_ccache
|
|
* @param[in] me The krb5_principal of the caller
|
|
* @param[in] server The krb5_principal of the requested service
|
|
* @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
|
|
* @param[out] out_creds The returned krb5_creds structure
|
|
* @return krb5_error_code
|
|
*
|
|
*/
|
|
krb5_error_code smb_krb5_get_credentials(krb5_context context,
|
|
krb5_ccache ccache,
|
|
krb5_principal me,
|
|
krb5_principal server,
|
|
krb5_principal impersonate_princ,
|
|
krb5_creds **out_creds)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_creds *creds = NULL;
|
|
|
|
if (out_creds != NULL) {
|
|
*out_creds = NULL;
|
|
}
|
|
|
|
if (impersonate_princ) {
|
|
#ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
|
|
ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
|
|
#elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
|
|
ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
|
|
#else
|
|
ret = ENOTSUP;
|
|
#endif
|
|
} else {
|
|
krb5_creds in_creds;
|
|
|
|
ZERO_STRUCT(in_creds);
|
|
|
|
in_creds.client = me;
|
|
in_creds.server = server;
|
|
|
|
ret = krb5_get_credentials(context, 0, ccache,
|
|
&in_creds, &creds);
|
|
}
|
|
if (ret) {
|
|
goto done;
|
|
}
|
|
|
|
if (out_creds) {
|
|
*out_creds = creds;
|
|
}
|
|
|
|
done:
|
|
if (creds && ret) {
|
|
krb5_free_creds(context, creds);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Initialize a krb5_keyblock with the given data.
|
|
*
|
|
* Initialized a new keyblock, allocates the contents fo the key and
|
|
* copies the data into the keyblock.
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] enctype The encryption type.
|
|
*
|
|
* @param[in] data The date to initialize the keyblock with.
|
|
*
|
|
* @param[in] length The length of the keyblock.
|
|
*
|
|
* @param[in] key Newly allocated keyblock structure.
|
|
*
|
|
* The key date must be freed using krb5_free_keyblock_contents() when it is
|
|
* no longer needed.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_keyblock_init_contents(krb5_context context,
|
|
krb5_enctype enctype,
|
|
const void *data,
|
|
size_t length,
|
|
krb5_keyblock *key)
|
|
{
|
|
#if defined(HAVE_KRB5_KEYBLOCK_INIT)
|
|
return krb5_keyblock_init(context, enctype, data, length, key);
|
|
#else
|
|
memset(key, 0, sizeof(krb5_keyblock));
|
|
KRB5_KEY_DATA(key) = SMB_MALLOC(length);
|
|
if (NULL == KRB5_KEY_DATA(key)) {
|
|
return ENOMEM;
|
|
}
|
|
memcpy(KRB5_KEY_DATA(key), data, length);
|
|
KRB5_KEY_LENGTH(key) = length;
|
|
KRB5_KEY_TYPE(key) = enctype;
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Simulate a kinit by putting the tgt in the given credential cache.
|
|
*
|
|
* This function uses a keyblock rather than needing the original password.
|
|
*
|
|
* @param[in] ctx The library context
|
|
*
|
|
* @param[in] cc The credential cache to put the tgt in.
|
|
*
|
|
* @param[in] principal The client princial
|
|
*
|
|
* @param[in] keyblock The keyblock to use.
|
|
*
|
|
* @param[in] target_service The service name of the initial credentials (or NULL).
|
|
*
|
|
* @param[in] krb_options Initial credential options.
|
|
*
|
|
* @param[in] expire_time A pointer to store the experation time of the
|
|
* credentials (or NULL).
|
|
*
|
|
* @param[in] kdc_time A pointer to store the time when the ticket becomes
|
|
* valid (or NULL).
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_kinit_keyblock_ccache(krb5_context ctx,
|
|
krb5_ccache cc,
|
|
krb5_principal principal,
|
|
krb5_keyblock *keyblock,
|
|
const char *target_service,
|
|
krb5_get_init_creds_opt *krb_options,
|
|
time_t *expire_time,
|
|
time_t *kdc_time)
|
|
{
|
|
krb5_error_code code = 0;
|
|
krb5_creds my_creds;
|
|
|
|
#if defined(HAVE_KRB5_GET_INIT_CREDS_KEYBLOCK)
|
|
code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal,
|
|
keyblock, 0, target_service,
|
|
krb_options);
|
|
#elif defined(HAVE_KRB5_GET_INIT_CREDS_KEYTAB)
|
|
{
|
|
#define SMB_CREDS_KEYTAB "MEMORY:tmp_kinit_keyblock_ccache"
|
|
char tmp_name[64] = {0};
|
|
krb5_keytab_entry entry;
|
|
krb5_keytab keytab;
|
|
int rc;
|
|
|
|
memset(&entry, 0, sizeof(entry));
|
|
entry.principal = principal;
|
|
*(KRB5_KT_KEY(&entry)) = *keyblock;
|
|
|
|
rc = snprintf(tmp_name, sizeof(tmp_name),
|
|
"%s-%p",
|
|
SMB_CREDS_KEYTAB,
|
|
&my_creds);
|
|
if (rc < 0) {
|
|
return KRB5_KT_BADNAME;
|
|
}
|
|
code = krb5_kt_resolve(ctx, tmp_name, &keytab);
|
|
if (code) {
|
|
return code;
|
|
}
|
|
|
|
code = krb5_kt_add_entry(ctx, keytab, &entry);
|
|
if (code) {
|
|
(void)krb5_kt_close(ctx, keytab);
|
|
goto done;
|
|
}
|
|
|
|
code = krb5_get_init_creds_keytab(ctx, &my_creds, principal,
|
|
keytab, 0, target_service,
|
|
krb_options);
|
|
(void)krb5_kt_close(ctx, keytab);
|
|
}
|
|
#else
|
|
#error krb5_get_init_creds_keyblock not available!
|
|
#endif
|
|
if (code) {
|
|
return code;
|
|
}
|
|
|
|
#ifndef SAMBA4_USES_HEIMDAL /* MIT */
|
|
/*
|
|
* We need to store the principal as returned from the KDC to the
|
|
* credentials cache. If we don't do that the KRB5 library is not
|
|
* able to find the tickets it is looking for
|
|
*/
|
|
principal = my_creds.client;
|
|
#endif
|
|
code = krb5_cc_initialize(ctx, cc, principal);
|
|
if (code) {
|
|
goto done;
|
|
}
|
|
|
|
code = krb5_cc_store_cred(ctx, cc, &my_creds);
|
|
if (code) {
|
|
goto done;
|
|
}
|
|
|
|
if (expire_time) {
|
|
*expire_time = (time_t) my_creds.times.endtime;
|
|
}
|
|
|
|
if (kdc_time) {
|
|
*kdc_time = (time_t) my_creds.times.starttime;
|
|
}
|
|
|
|
code = 0;
|
|
done:
|
|
krb5_free_cred_contents(ctx, &my_creds);
|
|
return code;
|
|
}
|
|
|
|
/**
|
|
* @brief Simulate a kinit by putting the tgt in the given credential cache.
|
|
*
|
|
* @param[in] ctx The library context
|
|
*
|
|
* @param[in] cc The credential cache to put the tgt in.
|
|
*
|
|
* @param[in] principal The client princial
|
|
*
|
|
* @param[in] password The password (or NULL).
|
|
*
|
|
* @param[in] target_service The service name of the initial credentials (or NULL).
|
|
*
|
|
* @param[in] krb_options Initial credential options.
|
|
*
|
|
* @param[in] expire_time A pointer to store the experation time of the
|
|
* credentials (or NULL).
|
|
*
|
|
* @param[in] kdc_time A pointer to store the time when the ticket becomes
|
|
* valid (or NULL).
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_kinit_password_ccache(krb5_context ctx,
|
|
krb5_ccache cc,
|
|
krb5_principal principal,
|
|
const char *password,
|
|
const char *target_service,
|
|
krb5_get_init_creds_opt *krb_options,
|
|
time_t *expire_time,
|
|
time_t *kdc_time)
|
|
{
|
|
krb5_error_code code = 0;
|
|
krb5_creds my_creds;
|
|
|
|
code = krb5_get_init_creds_password(ctx, &my_creds, principal,
|
|
password, NULL, NULL, 0,
|
|
target_service, krb_options);
|
|
if (code) {
|
|
return code;
|
|
}
|
|
|
|
/*
|
|
* We need to store the principal as returned from the KDC to the
|
|
* credentials cache. If we don't do that the KRB5 library is not
|
|
* able to find the tickets it is looking for
|
|
*/
|
|
principal = my_creds.client;
|
|
code = krb5_cc_initialize(ctx, cc, principal);
|
|
if (code) {
|
|
goto done;
|
|
}
|
|
|
|
code = krb5_cc_store_cred(ctx, cc, &my_creds);
|
|
if (code) {
|
|
goto done;
|
|
}
|
|
|
|
if (expire_time) {
|
|
*expire_time = (time_t) my_creds.times.endtime;
|
|
}
|
|
|
|
if (kdc_time) {
|
|
*kdc_time = (time_t) my_creds.times.starttime;
|
|
}
|
|
|
|
code = 0;
|
|
done:
|
|
krb5_free_cred_contents(ctx, &my_creds);
|
|
return code;
|
|
}
|
|
|
|
#ifdef SAMBA4_USES_HEIMDAL
|
|
/**
|
|
* @brief Simulate a kinit by putting the tgt in the given credential cache.
|
|
*
|
|
* @param[in] ctx The library context
|
|
*
|
|
* @param[in] cc The credential cache to store the tgt in.
|
|
*
|
|
* @param[in] principal The initial client princial.
|
|
*
|
|
* @param[in] password The password (or NULL).
|
|
*
|
|
* @param[in] impersonate_principal The impersonatiion principal (or NULL).
|
|
*
|
|
* @param[in] self_service The local service for S4U2Self if
|
|
* impersonate_principal is specified).
|
|
*
|
|
* @param[in] target_service The service name of the initial credentials
|
|
* (kpasswd/REALM or a remote service). It defaults
|
|
* to the krbtgt if NULL.
|
|
*
|
|
* @param[in] krb_options Initial credential options.
|
|
*
|
|
* @param[in] expire_time A pointer to store the experation time of the
|
|
* credentials (or NULL).
|
|
*
|
|
* @param[in] kdc_time A pointer to store the time when the ticket becomes
|
|
* valid (or NULL).
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_kinit_s4u2_ccache(krb5_context ctx,
|
|
krb5_ccache store_cc,
|
|
krb5_principal init_principal,
|
|
const char *init_password,
|
|
krb5_principal impersonate_principal,
|
|
const char *self_service,
|
|
const char *target_service,
|
|
krb5_get_init_creds_opt *krb_options,
|
|
time_t *expire_time,
|
|
time_t *kdc_time)
|
|
{
|
|
krb5_error_code code = 0;
|
|
krb5_get_creds_opt options;
|
|
krb5_principal store_principal;
|
|
krb5_creds store_creds;
|
|
krb5_creds *s4u2self_creds;
|
|
Ticket s4u2self_ticket;
|
|
size_t s4u2self_ticketlen;
|
|
krb5_creds *s4u2proxy_creds;
|
|
krb5_principal self_princ;
|
|
bool s4u2proxy;
|
|
krb5_principal target_princ;
|
|
krb5_ccache tmp_cc;
|
|
const char *self_realm;
|
|
const char *client_realm = NULL;
|
|
krb5_principal blacklist_principal = NULL;
|
|
krb5_principal whitelist_principal = NULL;
|
|
|
|
code = krb5_get_init_creds_password(ctx, &store_creds,
|
|
init_principal,
|
|
init_password,
|
|
NULL, NULL,
|
|
0,
|
|
NULL,
|
|
krb_options);
|
|
if (code != 0) {
|
|
return code;
|
|
}
|
|
|
|
store_principal = init_principal;
|
|
|
|
/*
|
|
* We are trying S4U2Self now:
|
|
*
|
|
* As we do not want to expose our TGT in the
|
|
* krb5_ccache, which is also holds the impersonated creds.
|
|
*
|
|
* Some low level krb5/gssapi function might use the TGT
|
|
* identity and let the client act as our machine account.
|
|
*
|
|
* We need to avoid that and use a temporary krb5_ccache
|
|
* in order to pass our TGT to the krb5_get_creds() function.
|
|
*/
|
|
code = krb5_cc_new_unique(ctx, NULL, NULL, &tmp_cc);
|
|
if (code != 0) {
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_cc_initialize(ctx, tmp_cc, store_creds.client);
|
|
if (code != 0) {
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_cc_store_cred(ctx, tmp_cc, &store_creds);
|
|
if (code != 0) {
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
/*
|
|
* we need to remember the client principal of our
|
|
* TGT and make sure the KDC does not return this
|
|
* in the impersonated tickets. This can happen
|
|
* if the KDC does not support S4U2Self and S4U2Proxy.
|
|
*/
|
|
blacklist_principal = store_creds.client;
|
|
store_creds.client = NULL;
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
|
|
/*
|
|
* Check if we also need S4U2Proxy or if S4U2Self is
|
|
* enough in order to get a ticket for the target.
|
|
*/
|
|
if (target_service == NULL) {
|
|
s4u2proxy = false;
|
|
} else if (strcmp(target_service, self_service) == 0) {
|
|
s4u2proxy = false;
|
|
} else {
|
|
s4u2proxy = true;
|
|
}
|
|
|
|
/*
|
|
* For S4U2Self we need our own service principal,
|
|
* which belongs to our own realm (available on
|
|
* our client principal).
|
|
*/
|
|
self_realm = krb5_principal_get_realm(ctx, init_principal);
|
|
|
|
code = krb5_parse_name(ctx, self_service, &self_princ);
|
|
if (code != 0) {
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_principal_set_realm(ctx, self_princ, self_realm);
|
|
if (code != 0) {
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_free_principal(ctx, self_princ);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_get_creds_opt_alloc(ctx, &options);
|
|
if (code != 0) {
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_free_principal(ctx, self_princ);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
if (s4u2proxy) {
|
|
/*
|
|
* If we want S4U2Proxy, we need the forwardable flag
|
|
* on the S4U2Self ticket.
|
|
*/
|
|
krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
|
|
}
|
|
|
|
code = krb5_get_creds_opt_set_impersonate(ctx, options,
|
|
impersonate_principal);
|
|
if (code != 0) {
|
|
krb5_get_creds_opt_free(ctx, options);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_free_principal(ctx, self_princ);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_get_creds(ctx, options, tmp_cc,
|
|
self_princ, &s4u2self_creds);
|
|
krb5_get_creds_opt_free(ctx, options);
|
|
krb5_free_principal(ctx, self_princ);
|
|
if (code != 0) {
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
if (!s4u2proxy) {
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
|
|
/*
|
|
* Now make sure we store the impersonated principal
|
|
* and creds instead of the TGT related stuff
|
|
* in the krb5_ccache of the caller.
|
|
*/
|
|
code = krb5_copy_creds_contents(ctx, s4u2self_creds,
|
|
&store_creds);
|
|
krb5_free_creds(ctx, s4u2self_creds);
|
|
if (code != 0) {
|
|
return code;
|
|
}
|
|
|
|
/*
|
|
* It's important to store the principal the KDC
|
|
* returned, as otherwise the caller would not find
|
|
* the S4U2Self ticket in the krb5_ccache lookup.
|
|
*/
|
|
store_principal = store_creds.client;
|
|
goto store;
|
|
}
|
|
|
|
/*
|
|
* We are trying S4U2Proxy:
|
|
*
|
|
* We need the ticket from the S4U2Self step
|
|
* and our TGT in order to get the delegated ticket.
|
|
*/
|
|
code = decode_Ticket((const uint8_t *)s4u2self_creds->ticket.data,
|
|
s4u2self_creds->ticket.length,
|
|
&s4u2self_ticket,
|
|
&s4u2self_ticketlen);
|
|
if (code != 0) {
|
|
krb5_free_creds(ctx, s4u2self_creds);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
/*
|
|
* we need to remember the client principal of the
|
|
* S4U2Self stage and as it needs to match the one we
|
|
* will get for the S4U2Proxy stage. We need this
|
|
* in order to detect KDCs which does not support S4U2Proxy.
|
|
*/
|
|
whitelist_principal = s4u2self_creds->client;
|
|
s4u2self_creds->client = NULL;
|
|
krb5_free_creds(ctx, s4u2self_creds);
|
|
|
|
/*
|
|
* For S4U2Proxy we also got a target service principal,
|
|
* which also belongs to our own realm (available on
|
|
* our client principal).
|
|
*/
|
|
code = krb5_parse_name(ctx, target_service, &target_princ);
|
|
if (code != 0) {
|
|
free_Ticket(&s4u2self_ticket);
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_principal_set_realm(ctx, target_princ, self_realm);
|
|
if (code != 0) {
|
|
free_Ticket(&s4u2self_ticket);
|
|
krb5_free_principal(ctx, target_princ);
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_get_creds_opt_alloc(ctx, &options);
|
|
if (code != 0) {
|
|
free_Ticket(&s4u2self_ticket);
|
|
krb5_free_principal(ctx, target_princ);
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_FORWARDABLE);
|
|
krb5_get_creds_opt_set_options(ctx, options, KRB5_GC_CONSTRAINED_DELEGATION);
|
|
|
|
code = krb5_get_creds_opt_set_ticket(ctx, options, &s4u2self_ticket);
|
|
free_Ticket(&s4u2self_ticket);
|
|
if (code != 0) {
|
|
krb5_get_creds_opt_free(ctx, options);
|
|
krb5_free_principal(ctx, target_princ);
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_get_creds(ctx, options, tmp_cc,
|
|
target_princ, &s4u2proxy_creds);
|
|
krb5_get_creds_opt_free(ctx, options);
|
|
krb5_free_principal(ctx, target_princ);
|
|
krb5_cc_destroy(ctx, tmp_cc);
|
|
if (code != 0) {
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
return code;
|
|
}
|
|
|
|
/*
|
|
* Now make sure we store the impersonated principal
|
|
* and creds instead of the TGT related stuff
|
|
* in the krb5_ccache of the caller.
|
|
*/
|
|
code = krb5_copy_creds_contents(ctx, s4u2proxy_creds,
|
|
&store_creds);
|
|
krb5_free_creds(ctx, s4u2proxy_creds);
|
|
if (code != 0) {
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
return code;
|
|
}
|
|
|
|
/*
|
|
* It's important to store the principal the KDC
|
|
* returned, as otherwise the caller would not find
|
|
* the S4U2Self ticket in the krb5_ccache lookup.
|
|
*/
|
|
store_principal = store_creds.client;
|
|
|
|
store:
|
|
if (blacklist_principal &&
|
|
krb5_principal_compare(ctx, store_creds.client, blacklist_principal)) {
|
|
char *sp = NULL;
|
|
char *ip = NULL;
|
|
|
|
code = krb5_unparse_name(ctx, blacklist_principal, &sp);
|
|
if (code != 0) {
|
|
sp = NULL;
|
|
}
|
|
code = krb5_unparse_name(ctx, impersonate_principal, &ip);
|
|
if (code != 0) {
|
|
ip = NULL;
|
|
}
|
|
DEBUG(1, ("smb_krb5_kinit_password_cache: "
|
|
"KDC returned self principal[%s] while impersonating [%s]\n",
|
|
sp?sp:"<no memory>",
|
|
ip?ip:"<no memory>"));
|
|
|
|
SAFE_FREE(sp);
|
|
SAFE_FREE(ip);
|
|
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
return KRB5_FWD_BAD_PRINCIPAL;
|
|
}
|
|
if (blacklist_principal) {
|
|
krb5_free_principal(ctx, blacklist_principal);
|
|
}
|
|
|
|
if (whitelist_principal &&
|
|
!krb5_principal_compare(ctx, store_creds.client, whitelist_principal)) {
|
|
char *sp = NULL;
|
|
char *ep = NULL;
|
|
|
|
code = krb5_unparse_name(ctx, store_creds.client, &sp);
|
|
if (code != 0) {
|
|
sp = NULL;
|
|
}
|
|
code = krb5_unparse_name(ctx, whitelist_principal, &ep);
|
|
if (code != 0) {
|
|
ep = NULL;
|
|
}
|
|
DEBUG(1, ("smb_krb5_kinit_password_cache: "
|
|
"KDC returned wrong principal[%s] we expected [%s]\n",
|
|
sp?sp:"<no memory>",
|
|
ep?ep:"<no memory>"));
|
|
|
|
SAFE_FREE(sp);
|
|
SAFE_FREE(ep);
|
|
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
return KRB5_FWD_BAD_PRINCIPAL;
|
|
}
|
|
if (whitelist_principal) {
|
|
krb5_free_principal(ctx, whitelist_principal);
|
|
}
|
|
|
|
code = krb5_cc_initialize(ctx, store_cc, store_principal);
|
|
if (code != 0) {
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
|
|
if (code != 0) {
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
return code;
|
|
}
|
|
|
|
client_realm = krb5_principal_get_realm(ctx, store_creds.client);
|
|
if (client_realm != NULL) {
|
|
/*
|
|
* Because the CANON flag doesn't have any impact
|
|
* on the impersonate_principal => store_creds.client
|
|
* realm mapping. We need to store the credentials twice,
|
|
* once with the returned realm and once with the
|
|
* realm of impersonate_principal.
|
|
*/
|
|
code = krb5_principal_set_realm(ctx, store_creds.server,
|
|
client_realm);
|
|
if (code != 0) {
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
return code;
|
|
}
|
|
|
|
code = krb5_cc_store_cred(ctx, store_cc, &store_creds);
|
|
if (code != 0) {
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
return code;
|
|
}
|
|
}
|
|
|
|
if (expire_time) {
|
|
*expire_time = (time_t) store_creds.times.endtime;
|
|
}
|
|
|
|
if (kdc_time) {
|
|
*kdc_time = (time_t) store_creds.times.starttime;
|
|
}
|
|
|
|
krb5_free_cred_contents(ctx, &store_creds);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if !defined(HAVE_KRB5_MAKE_PRINCIPAL) && defined(HAVE_KRB5_BUILD_PRINCIPAL_ALLOC_VA)
|
|
/**
|
|
* @brief Create a principal name using a variable argument list.
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[inout] principal A pointer to the principal structure.
|
|
*
|
|
* @param[in] _realm The realm to use. If NULL then the function will
|
|
* get the default realm name.
|
|
*
|
|
* @param[in] ... A list of 'char *' components, ending with NULL.
|
|
*
|
|
* Use krb5_free_principal() to free the principal when it is no longer needed.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_make_principal(krb5_context context,
|
|
krb5_principal *principal,
|
|
const char *_realm, ...)
|
|
{
|
|
krb5_error_code code;
|
|
bool free_realm;
|
|
char *realm;
|
|
va_list ap;
|
|
|
|
if (_realm) {
|
|
realm = discard_const_p(char, _realm);
|
|
free_realm = false;
|
|
} else {
|
|
code = krb5_get_default_realm(context, &realm);
|
|
if (code) {
|
|
return code;
|
|
}
|
|
free_realm = true;
|
|
}
|
|
|
|
va_start(ap, _realm);
|
|
code = krb5_build_principal_alloc_va(context, principal,
|
|
strlen(realm), realm,
|
|
ap);
|
|
va_end(ap);
|
|
|
|
if (free_realm) {
|
|
krb5_free_default_realm(context, realm);
|
|
}
|
|
|
|
return code;
|
|
}
|
|
#endif
|
|
|
|
#if !defined(HAVE_KRB5_CC_GET_LIFETIME) && defined(HAVE_KRB5_CC_RETRIEVE_CRED)
|
|
/**
|
|
* @brief Get the lifetime of the initial ticket in the cache.
|
|
*
|
|
* @param[in] context The kerberos context.
|
|
*
|
|
* @param[in] id The credential cache to get the ticket lifetime.
|
|
*
|
|
* @param[out] t A pointer to a time value to store the lifetime.
|
|
*
|
|
* @return 0 on success, a krb5_error_code on error.
|
|
*/
|
|
krb5_error_code smb_krb5_cc_get_lifetime(krb5_context context,
|
|
krb5_ccache id,
|
|
time_t *t)
|
|
{
|
|
krb5_cc_cursor cursor;
|
|
krb5_error_code kerr;
|
|
krb5_creds cred;
|
|
krb5_timestamp now;
|
|
|
|
*t = 0;
|
|
|
|
kerr = krb5_timeofday(context, &now);
|
|
if (kerr) {
|
|
return kerr;
|
|
}
|
|
|
|
kerr = krb5_cc_start_seq_get(context, id, &cursor);
|
|
if (kerr) {
|
|
return kerr;
|
|
}
|
|
|
|
while ((kerr = krb5_cc_next_cred(context, id, &cursor, &cred)) == 0) {
|
|
#ifndef HAVE_FLAGS_IN_KRB5_CREDS
|
|
if (cred.ticket_flags & TKT_FLG_INITIAL) {
|
|
#else
|
|
if (cred.flags.b.initial) {
|
|
#endif
|
|
if (now < cred.times.endtime) {
|
|
*t = (time_t) (cred.times.endtime - now);
|
|
}
|
|
krb5_free_cred_contents(context, &cred);
|
|
break;
|
|
}
|
|
krb5_free_cred_contents(context, &cred);
|
|
}
|
|
|
|
krb5_cc_end_seq_get(context, id, &cursor);
|
|
|
|
return kerr;
|
|
}
|
|
#endif /* HAVE_KRB5_CC_GET_LIFETIME */
|
|
|
|
#if !defined(HAVE_KRB5_FREE_CHECKSUM_CONTENTS) && defined(HAVE_FREE_CHECKSUM)
|
|
void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
|
|
{
|
|
free_Checksum(cksum);
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Compute a checksum operating on a keyblock.
|
|
*
|
|
* This function computes a checksum over a PAC using the keyblock for a keyed
|
|
* checksum.
|
|
*
|
|
* @param[in] mem_ctx A talloc context to alocate the signature on.
|
|
*
|
|
* @param[in] pac_data The PAC as input.
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[in] keyblock Encryption key for a keyed checksum.
|
|
*
|
|
* @param[out] sig_type The checksum type
|
|
*
|
|
* @param[out] sig_blob The talloc'ed checksum
|
|
*
|
|
* The caller must free the sig_blob with talloc_free() when it is not needed
|
|
* anymore.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
|
|
DATA_BLOB *pac_data,
|
|
krb5_context context,
|
|
const krb5_keyblock *keyblock,
|
|
uint32_t *sig_type,
|
|
DATA_BLOB *sig_blob)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_checksum cksum;
|
|
#if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
|
|
krb5_crypto crypto;
|
|
|
|
|
|
ret = krb5_crypto_init(context,
|
|
keyblock,
|
|
0,
|
|
&crypto);
|
|
if (ret) {
|
|
DEBUG(0,("krb5_crypto_init() failed: %s\n",
|
|
smb_get_krb5_error_message(context, ret, mem_ctx)));
|
|
return ret;
|
|
}
|
|
ret = krb5_create_checksum(context,
|
|
crypto,
|
|
KRB5_KU_OTHER_CKSUM,
|
|
0,
|
|
pac_data->data,
|
|
pac_data->length,
|
|
&cksum);
|
|
if (ret) {
|
|
DEBUG(2, ("PAC Verification failed: %s\n",
|
|
smb_get_krb5_error_message(context, ret, mem_ctx)));
|
|
}
|
|
|
|
krb5_crypto_destroy(context, crypto);
|
|
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
*sig_type = cksum.cksumtype;
|
|
*sig_blob = data_blob_talloc(mem_ctx,
|
|
cksum.checksum.data,
|
|
cksum.checksum.length);
|
|
#elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
|
|
krb5_data input;
|
|
|
|
input.data = (char *)pac_data->data;
|
|
input.length = pac_data->length;
|
|
|
|
ret = krb5_c_make_checksum(context,
|
|
0,
|
|
keyblock,
|
|
KRB5_KEYUSAGE_APP_DATA_CKSUM,
|
|
&input,
|
|
&cksum);
|
|
if (ret) {
|
|
DEBUG(2, ("PAC Verification failed: %s\n",
|
|
smb_get_krb5_error_message(context, ret, mem_ctx)));
|
|
return ret;
|
|
}
|
|
|
|
*sig_type = cksum.checksum_type;
|
|
*sig_blob = data_blob_talloc(mem_ctx,
|
|
cksum.contents,
|
|
cksum.length);
|
|
|
|
#else
|
|
#error krb5_create_checksum or krb5_c_make_checksum not available
|
|
#endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
|
|
smb_krb5_free_checksum_contents(context, &cksum);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief Get realm of a principal
|
|
*
|
|
* @param[in] mem_ctx The talloc ctx to put the result on
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] principal The principal to get the realm from.
|
|
*
|
|
* @return A talloced string with the realm or NULL if an error occurred.
|
|
*/
|
|
char *smb_krb5_principal_get_realm(TALLOC_CTX *mem_ctx,
|
|
krb5_context context,
|
|
krb5_const_principal principal)
|
|
{
|
|
#ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
|
|
return talloc_strdup(mem_ctx,
|
|
krb5_principal_get_realm(context, principal));
|
|
#elif defined(krb5_princ_realm) /* MIT */
|
|
const krb5_data *realm;
|
|
realm = krb5_princ_realm(context, principal);
|
|
return talloc_strndup(mem_ctx, realm->data, realm->length);
|
|
#else
|
|
#error UNKNOWN_GET_PRINC_REALM_FUNCTIONS
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Get realm of a principal
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] principal The principal to set the realm
|
|
*
|
|
* @param[in] realm The realm as a string to set.
|
|
*
|
|
* @retur 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_principal_set_realm(krb5_context context,
|
|
krb5_principal principal,
|
|
const char *realm)
|
|
{
|
|
#ifdef HAVE_KRB5_PRINCIPAL_SET_REALM /* Heimdal */
|
|
return krb5_principal_set_realm(context, principal, realm);
|
|
#elif defined(krb5_princ_realm) && defined(krb5_princ_set_realm) /* MIT */
|
|
krb5_error_code ret;
|
|
krb5_data data;
|
|
krb5_data *old_data;
|
|
|
|
old_data = krb5_princ_realm(context, principal);
|
|
|
|
ret = smb_krb5_copy_data_contents(&data,
|
|
realm,
|
|
strlen(realm));
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
/* free realm before setting */
|
|
free(old_data->data);
|
|
|
|
krb5_princ_set_realm(context, principal, &data);
|
|
|
|
return ret;
|
|
#else
|
|
#error UNKNOWN_PRINC_SET_REALM_FUNCTION
|
|
#endif
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief Get the realm from the service hostname.
|
|
*
|
|
* This function will look for a domain realm mapping in the [domain_realm]
|
|
* section of the krb5.conf first and fallback to extract the realm from
|
|
* the provided service hostname. As a last resort it will return the
|
|
* provided client_realm.
|
|
*
|
|
* @param[in] mem_ctx The talloc context
|
|
*
|
|
* @param[in] hostname The service hostname
|
|
*
|
|
* @param[in] client_realm If we can not find a mapping, fall back to
|
|
* this realm.
|
|
*
|
|
* @return The realm to use for the service hostname, NULL if a fatal error
|
|
* occured.
|
|
*/
|
|
char *smb_krb5_get_realm_from_hostname(TALLOC_CTX *mem_ctx,
|
|
const char *hostname,
|
|
const char *client_realm)
|
|
{
|
|
#if defined(HAVE_KRB5_REALM_TYPE)
|
|
/* Heimdal. */
|
|
krb5_realm *realm_list = NULL;
|
|
#else
|
|
/* MIT */
|
|
char **realm_list = NULL;
|
|
#endif
|
|
char *realm = NULL;
|
|
krb5_error_code kerr;
|
|
krb5_context ctx = NULL;
|
|
|
|
kerr = smb_krb5_init_context_common(&ctx);
|
|
if (kerr) {
|
|
DBG_ERR("kerberos init context failed (%s)\n",
|
|
error_message(kerr));
|
|
return NULL;
|
|
}
|
|
|
|
kerr = krb5_get_host_realm(ctx, hostname, &realm_list);
|
|
if (kerr == KRB5_ERR_HOST_REALM_UNKNOWN) {
|
|
realm_list = NULL;
|
|
kerr = 0;
|
|
}
|
|
if (kerr != 0) {
|
|
DEBUG(3,("kerberos_get_realm_from_hostname %s: "
|
|
"failed %s\n",
|
|
hostname ? hostname : "(NULL)",
|
|
error_message(kerr) ));
|
|
goto out;
|
|
}
|
|
|
|
if (realm_list != NULL &&
|
|
realm_list[0] != NULL &&
|
|
realm_list[0][0] != '\0') {
|
|
realm = talloc_strdup(mem_ctx, realm_list[0]);
|
|
if (realm == NULL) {
|
|
goto out;
|
|
}
|
|
} else {
|
|
const char *p = NULL;
|
|
|
|
/*
|
|
* "dc6.samba2003.example.com"
|
|
* returns a realm of "SAMBA2003.EXAMPLE.COM"
|
|
*
|
|
* "dc6." returns realm as NULL
|
|
*/
|
|
p = strchr_m(hostname, '.');
|
|
if (p != NULL && p[1] != '\0') {
|
|
realm = talloc_strdup_upper(mem_ctx, p + 1);
|
|
if (realm == NULL) {
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (realm == NULL) {
|
|
realm = talloc_strdup(mem_ctx, client_realm);
|
|
}
|
|
|
|
out:
|
|
|
|
if (ctx) {
|
|
if (realm_list) {
|
|
krb5_free_host_realm(ctx, realm_list);
|
|
realm_list = NULL;
|
|
}
|
|
krb5_free_context(ctx);
|
|
ctx = NULL;
|
|
}
|
|
return realm;
|
|
}
|
|
|
|
/**
|
|
* @brief Get an error string from a Kerberos error code.
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[in] code The Kerberos error code.
|
|
*
|
|
* @param[in] mem_ctx The talloc context to allocate the error string on.
|
|
*
|
|
* @return A talloc'ed error string or NULL if an error occurred.
|
|
*
|
|
* The caller must free the returned error string with talloc_free() if not
|
|
* needed anymore
|
|
*/
|
|
char *smb_get_krb5_error_message(krb5_context context,
|
|
krb5_error_code code,
|
|
TALLOC_CTX *mem_ctx)
|
|
{
|
|
char *ret;
|
|
|
|
#if defined(HAVE_KRB5_GET_ERROR_MESSAGE) && defined(HAVE_KRB5_FREE_ERROR_MESSAGE)
|
|
const char *context_error = krb5_get_error_message(context, code);
|
|
if (context_error) {
|
|
ret = talloc_asprintf(mem_ctx, "%s: %s",
|
|
error_message(code), context_error);
|
|
krb5_free_error_message(context, context_error);
|
|
return ret;
|
|
}
|
|
#endif
|
|
ret = talloc_strdup(mem_ctx, error_message(code));
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* @brief Return the type of a krb5_principal
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[in] principal The principal to get the type from.
|
|
*
|
|
* @return The integer type of the principal.
|
|
*/
|
|
int smb_krb5_principal_get_type(krb5_context context,
|
|
krb5_const_principal principal)
|
|
{
|
|
#ifdef HAVE_KRB5_PRINCIPAL_GET_TYPE /* Heimdal */
|
|
return krb5_principal_get_type(context, principal);
|
|
#elif defined(krb5_princ_type) /* MIT */
|
|
return krb5_princ_type(context, principal);
|
|
#else
|
|
#error UNKNOWN_PRINC_GET_TYPE_FUNCTION
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* @brief Set the type of a principal
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[inout] principal The principal to set the type for.
|
|
*
|
|
* @param[in] type The principal type to set.
|
|
*/
|
|
void smb_krb5_principal_set_type(krb5_context context,
|
|
krb5_principal principal,
|
|
int type)
|
|
{
|
|
#ifdef HAVE_KRB5_PRINCIPAL_SET_TYPE /* Heimdal */
|
|
krb5_principal_set_type(context, principal, type);
|
|
#elif defined(krb5_princ_type) /* MIT */
|
|
krb5_princ_type(context, principal) = type;
|
|
#else
|
|
#error UNKNOWN_PRINC_SET_TYPE_FUNCTION
|
|
#endif
|
|
}
|
|
|
|
#if !defined(HAVE_KRB5_WARNX)
|
|
/**
|
|
* @brief Log a Kerberos message
|
|
*
|
|
* It sends the message to com_err.
|
|
*
|
|
* @param[in] context The library context
|
|
*
|
|
* @param[in] fmt The message format
|
|
*
|
|
* @param[in] ... The message arguments
|
|
*
|
|
* @return 0 on success.
|
|
*/
|
|
krb5_error_code krb5_warnx(krb5_context context, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
com_err_va("samba-kdc", errno, fmt, args);
|
|
va_end(args);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Copy a credential cache.
|
|
*
|
|
* @param[in] context The library context.
|
|
*
|
|
* @param[in] incc Credential cache to be copied.
|
|
*
|
|
* @param[inout] outcc Copy of credential cache to be filled in.
|
|
*
|
|
* @return 0 on success, a Kerberos error code otherwise.
|
|
*/
|
|
krb5_error_code smb_krb5_cc_copy_creds(krb5_context context,
|
|
krb5_ccache incc, krb5_ccache outcc)
|
|
{
|
|
#ifdef HAVE_KRB5_CC_COPY_CACHE /* Heimdal */
|
|
return krb5_cc_copy_cache(context, incc, outcc);
|
|
#elif defined(HAVE_KRB5_CC_COPY_CREDS)
|
|
krb5_error_code ret;
|
|
krb5_principal princ = NULL;
|
|
|
|
ret = krb5_cc_get_principal(context, incc, &princ);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
ret = krb5_cc_initialize(context, outcc, princ);
|
|
krb5_free_principal(context, princ);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
return krb5_cc_copy_creds(context, incc, outcc);
|
|
#else
|
|
#error UNKNOWN_KRB5_CC_COPY_CACHE_OR_CREDS_FUNCTION
|
|
#endif
|
|
}
|
|
|
|
/**********************************************************
|
|
* ADS KRB5 CALLS
|
|
**********************************************************/
|
|
|
|
static bool ads_cleanup_expired_creds(krb5_context context,
|
|
krb5_ccache ccache,
|
|
krb5_creds *credsp)
|
|
{
|
|
krb5_error_code retval;
|
|
const char *cc_type = krb5_cc_get_type(context, ccache);
|
|
|
|
DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
|
|
cc_type, krb5_cc_get_name(context, ccache),
|
|
http_timestring(talloc_tos(), credsp->times.endtime)));
|
|
|
|
/* we will probably need new tickets if the current ones
|
|
will expire within 10 seconds.
|
|
*/
|
|
if (credsp->times.endtime >= (time(NULL) + 10))
|
|
return false;
|
|
|
|
/* heimdal won't remove creds from a file ccache, and
|
|
perhaps we shouldn't anyway, since internally we
|
|
use memory ccaches, and a FILE one probably means that
|
|
we're using creds obtained outside of our exectuable
|
|
*/
|
|
if (strequal(cc_type, "FILE")) {
|
|
DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
|
|
return false;
|
|
}
|
|
|
|
retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
|
|
if (retval) {
|
|
DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
|
|
error_message(retval)));
|
|
/* If we have an error in this, we want to display it,
|
|
but continue as though we deleted it */
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Allocate and setup the auth context into the state we need. */
|
|
|
|
static krb5_error_code ads_setup_auth_context(krb5_context context,
|
|
krb5_auth_context *auth_context)
|
|
{
|
|
krb5_error_code retval;
|
|
|
|
retval = krb5_auth_con_init(context, auth_context );
|
|
if (retval) {
|
|
DEBUG(1,("krb5_auth_con_init failed (%s)\n",
|
|
error_message(retval)));
|
|
return retval;
|
|
}
|
|
|
|
/* Ensure this is an addressless ticket. */
|
|
retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
|
|
if (retval) {
|
|
DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
|
|
error_message(retval)));
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
|
|
static krb5_error_code ads_create_gss_checksum(krb5_data *in_data, /* [inout] */
|
|
uint32_t gss_flags)
|
|
{
|
|
unsigned int orig_length = in_data->length;
|
|
unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
|
|
char *gss_cksum = NULL;
|
|
|
|
if (orig_length) {
|
|
/* Extra length field for delgated ticket. */
|
|
base_cksum_size += 4;
|
|
}
|
|
|
|
if ((unsigned int)base_cksum_size + orig_length <
|
|
(unsigned int)base_cksum_size) {
|
|
return EINVAL;
|
|
}
|
|
|
|
gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
|
|
if (gss_cksum == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
memset(gss_cksum, '\0', base_cksum_size + orig_length);
|
|
SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
|
|
|
|
/*
|
|
* GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
|
|
* This matches the behavior of heimdal and mit.
|
|
*
|
|
* And it is needed to work against some closed source
|
|
* SMB servers.
|
|
*
|
|
* See bug #7883
|
|
*/
|
|
memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
|
|
|
|
SIVAL(gss_cksum, 20, gss_flags);
|
|
|
|
if (orig_length && in_data->data != NULL) {
|
|
SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
|
|
SSVAL(gss_cksum, 26, orig_length);
|
|
/* Copy the kerberos KRB_CRED data */
|
|
memcpy(gss_cksum + 28, in_data->data, orig_length);
|
|
free(in_data->data);
|
|
in_data->data = NULL;
|
|
in_data->length = 0;
|
|
}
|
|
in_data->data = gss_cksum;
|
|
in_data->length = base_cksum_size + orig_length;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* We can't use krb5_mk_req because w2k wants the service to be in a particular
|
|
* format.
|
|
*/
|
|
static krb5_error_code ads_krb5_mk_req(krb5_context context,
|
|
krb5_auth_context *auth_context,
|
|
const krb5_flags ap_req_options,
|
|
const char *principal,
|
|
krb5_ccache ccache,
|
|
krb5_data *outbuf,
|
|
time_t *expire_time,
|
|
const char *impersonate_princ_s)
|
|
{
|
|
krb5_error_code retval;
|
|
krb5_principal server;
|
|
krb5_principal impersonate_princ = NULL;
|
|
krb5_creds *credsp;
|
|
krb5_creds creds;
|
|
krb5_data in_data;
|
|
bool creds_ready = false;
|
|
int i = 0, maxtries = 3;
|
|
bool ok;
|
|
|
|
ZERO_STRUCT(in_data);
|
|
|
|
retval = smb_krb5_parse_name(context, principal, &server);
|
|
if (retval != 0) {
|
|
DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
|
|
return retval;
|
|
}
|
|
|
|
if (impersonate_princ_s) {
|
|
retval = smb_krb5_parse_name(context, impersonate_princ_s,
|
|
&impersonate_princ);
|
|
if (retval) {
|
|
DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
|
|
goto cleanup_princ;
|
|
}
|
|
}
|
|
|
|
/* obtain ticket & session key */
|
|
ZERO_STRUCT(creds);
|
|
if ((retval = krb5_copy_principal(context, server, &creds.server))) {
|
|
DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
|
|
error_message(retval)));
|
|
goto cleanup_princ;
|
|
}
|
|
|
|
retval = krb5_cc_get_principal(context, ccache, &creds.client);
|
|
if (retval != 0) {
|
|
/* This can commonly fail on smbd startup with no ticket in the cache.
|
|
* Report at higher level than 1. */
|
|
DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
|
|
error_message(retval)));
|
|
goto cleanup_creds;
|
|
}
|
|
|
|
while (!creds_ready && (i < maxtries)) {
|
|
|
|
retval = smb_krb5_get_credentials(context,
|
|
ccache,
|
|
creds.client,
|
|
creds.server,
|
|
impersonate_princ,
|
|
&credsp);
|
|
if (retval != 0) {
|
|
DBG_WARNING("smb_krb5_get_credentials failed for %s "
|
|
"(%s)\n",
|
|
principal,
|
|
error_message(retval));
|
|
goto cleanup_creds;
|
|
}
|
|
|
|
/* cope with ticket being in the future due to clock skew */
|
|
if ((unsigned)credsp->times.starttime > time(NULL)) {
|
|
time_t t = time(NULL);
|
|
int time_offset =(int)((unsigned)credsp->times.starttime-t);
|
|
DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
|
|
krb5_set_real_time(context, t + time_offset + 1, 0);
|
|
}
|
|
|
|
ok = ads_cleanup_expired_creds(context, ccache, credsp);
|
|
if (!ok) {
|
|
creds_ready = true;
|
|
}
|
|
|
|
i++;
|
|
}
|
|
|
|
DBG_DEBUG("Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
|
|
principal,
|
|
krb5_cc_get_type(context, ccache),
|
|
krb5_cc_get_name(context, ccache),
|
|
http_timestring(talloc_tos(),
|
|
(unsigned)credsp->times.endtime),
|
|
(unsigned)credsp->times.endtime);
|
|
|
|
if (expire_time) {
|
|
*expire_time = (time_t)credsp->times.endtime;
|
|
}
|
|
|
|
/* Allocate the auth_context. */
|
|
retval = ads_setup_auth_context(context, auth_context);
|
|
if (retval != 0) {
|
|
DBG_WARNING("ads_setup_auth_context failed (%s)\n",
|
|
error_message(retval));
|
|
goto cleanup_creds;
|
|
}
|
|
|
|
#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
|
|
{
|
|
uint32_t gss_flags = 0;
|
|
|
|
if (credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE) {
|
|
/*
|
|
* Fetch a forwarded TGT from the KDC so that we can
|
|
* hand off a 2nd ticket as part of the kerberos
|
|
* exchange.
|
|
*/
|
|
|
|
DBG_INFO("Server marked as OK to delegate to, building "
|
|
"forwardable TGT\n");
|
|
|
|
retval = krb5_auth_con_setuseruserkey(context,
|
|
*auth_context,
|
|
&credsp->keyblock );
|
|
if (retval != 0) {
|
|
DBG_WARNING("krb5_auth_con_setuseruserkey "
|
|
"failed (%s)\n",
|
|
error_message(retval));
|
|
goto cleanup_creds;
|
|
}
|
|
|
|
/* Must use a subkey for forwarded tickets. */
|
|
retval = krb5_auth_con_setflags(context,
|
|
*auth_context,
|
|
KRB5_AUTH_CONTEXT_USE_SUBKEY);
|
|
if (retval != 0) {
|
|
DBG_WARNING("krb5_auth_con_setflags failed (%s)\n",
|
|
error_message(retval));
|
|
goto cleanup_creds;
|
|
}
|
|
|
|
retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
|
|
*auth_context, /* Authentication context [in] */
|
|
discard_const_p(char, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
|
|
credsp->client, /* Client principal for the tgt [in] */
|
|
credsp->server, /* Server principal for the tgt [in] */
|
|
ccache, /* Credential cache to use for storage [in] */
|
|
1, /* Turn on for "Forwardable ticket" [in] */
|
|
&in_data ); /* Resulting response [out] */
|
|
|
|
if (retval) {
|
|
DBG_INFO("krb5_fwd_tgt_creds failed (%s)\n",
|
|
error_message(retval));
|
|
|
|
/*
|
|
* This is not fatal. Delete the *auth_context and continue
|
|
* with krb5_mk_req_extended to get a non-forwardable ticket.
|
|
*/
|
|
|
|
if (in_data.data) {
|
|
free( in_data.data );
|
|
in_data.data = NULL;
|
|
in_data.length = 0;
|
|
}
|
|
krb5_auth_con_free(context, *auth_context);
|
|
*auth_context = NULL;
|
|
retval = ads_setup_auth_context(context, auth_context);
|
|
if (retval != 0) {
|
|
DBG_WARNING("ads_setup_auth_context failed (%s)\n",
|
|
error_message(retval));
|
|
goto cleanup_creds;
|
|
}
|
|
} else {
|
|
/* We got a delegated ticket. */
|
|
gss_flags |= GSS_C_DELEG_FLAG;
|
|
}
|
|
}
|
|
|
|
/* Frees and reallocates in_data into a GSS checksum blob. */
|
|
retval = ads_create_gss_checksum(&in_data, gss_flags);
|
|
if (retval != 0) {
|
|
goto cleanup_data;
|
|
}
|
|
|
|
/* We always want GSS-checksum types. */
|
|
retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
|
|
if (retval != 0) {
|
|
DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
|
|
error_message(retval)));
|
|
goto cleanup_data;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
|
|
&in_data, credsp, outbuf);
|
|
if (retval != 0) {
|
|
DBG_WARNING("krb5_mk_req_extended failed (%s)\n",
|
|
error_message(retval));
|
|
}
|
|
|
|
#if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
|
|
cleanup_data:
|
|
#endif
|
|
|
|
if (in_data.data) {
|
|
free( in_data.data );
|
|
in_data.length = 0;
|
|
}
|
|
|
|
krb5_free_creds(context, credsp);
|
|
|
|
cleanup_creds:
|
|
krb5_free_cred_contents(context, &creds);
|
|
|
|
cleanup_princ:
|
|
krb5_free_principal(context, server);
|
|
if (impersonate_princ) {
|
|
krb5_free_principal(context, impersonate_princ);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
get a kerberos5 ticket for the given service
|
|
*/
|
|
int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
|
|
const char *principal,
|
|
time_t time_offset,
|
|
DATA_BLOB *ticket,
|
|
DATA_BLOB *session_key_krb5,
|
|
uint32_t extra_ap_opts, const char *ccname,
|
|
time_t *tgs_expire,
|
|
const char *impersonate_princ_s)
|
|
{
|
|
krb5_error_code retval;
|
|
krb5_data packet;
|
|
krb5_context context = NULL;
|
|
krb5_ccache ccdef = NULL;
|
|
krb5_auth_context auth_context = NULL;
|
|
krb5_enctype enc_types[] = {
|
|
ENCTYPE_AES256_CTS_HMAC_SHA1_96,
|
|
ENCTYPE_AES128_CTS_HMAC_SHA1_96,
|
|
ENCTYPE_ARCFOUR_HMAC,
|
|
ENCTYPE_NULL};
|
|
bool ok;
|
|
|
|
retval = smb_krb5_init_context_common(&context);
|
|
if (retval != 0) {
|
|
DBG_ERR("kerberos init context failed (%s)\n",
|
|
error_message(retval));
|
|
goto failed;
|
|
}
|
|
|
|
if (time_offset != 0) {
|
|
krb5_set_real_time(context, time(NULL) + time_offset, 0);
|
|
}
|
|
|
|
retval = krb5_cc_resolve(context,
|
|
ccname ? ccname : krb5_cc_default_name(context),
|
|
&ccdef);
|
|
if (retval != 0) {
|
|
DBG_WARNING("krb5_cc_default failed (%s)\n",
|
|
error_message(retval));
|
|
goto failed;
|
|
}
|
|
|
|
retval = krb5_set_default_tgs_ktypes(context, enc_types);
|
|
if (retval != 0) {
|
|
DBG_WARNING("krb5_set_default_tgs_ktypes failed (%s)\n",
|
|
error_message(retval));
|
|
goto failed;
|
|
}
|
|
|
|
retval = ads_krb5_mk_req(context,
|
|
&auth_context,
|
|
AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
|
|
principal,
|
|
ccdef,
|
|
&packet,
|
|
tgs_expire,
|
|
impersonate_princ_s);
|
|
if (retval != 0) {
|
|
goto failed;
|
|
}
|
|
|
|
ok = smb_krb5_get_smb_session_key(mem_ctx,
|
|
context,
|
|
auth_context,
|
|
session_key_krb5,
|
|
false);
|
|
if (!ok) {
|
|
retval = ENOMEM;
|
|
goto failed;
|
|
}
|
|
|
|
*ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
|
|
|
|
smb_krb5_free_data_contents(context, &packet);
|
|
|
|
failed:
|
|
|
|
if (context) {
|
|
if (ccdef) {
|
|
krb5_cc_close(context, ccdef);
|
|
}
|
|
if (auth_context) {
|
|
krb5_auth_con_free(context, auth_context);
|
|
}
|
|
krb5_free_context(context);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
#ifndef SAMBA4_USES_HEIMDAL /* MITKRB5 tracing callback */
|
|
static void smb_krb5_trace_cb(krb5_context ctx,
|
|
#ifdef HAVE_KRB5_TRACE_INFO
|
|
const krb5_trace_info *info,
|
|
#elif defined(HAVE_KRB5_TRACE_INFO_STRUCT)
|
|
const struct krb5_trace_info *info,
|
|
#else
|
|
#error unknown krb5_trace_info
|
|
#endif
|
|
void *data)
|
|
{
|
|
if (info != NULL) {
|
|
DBGC_DEBUG(DBGC_KERBEROS, "%s", info->message);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
krb5_error_code smb_krb5_init_context_common(krb5_context *_krb5_context)
|
|
{
|
|
krb5_error_code ret;
|
|
krb5_context krb5_ctx;
|
|
|
|
initialize_krb5_error_table();
|
|
|
|
ret = krb5_init_context(&krb5_ctx);
|
|
if (ret) {
|
|
DBG_ERR("Krb5 context initialization failed (%s)\n",
|
|
error_message(ret));
|
|
return ret;
|
|
}
|
|
|
|
/* The MIT Kerberos build relies on using the system krb5.conf file.
|
|
* If you really want to use another file please set KRB5_CONFIG
|
|
* accordingly. */
|
|
#ifndef SAMBA4_USES_HEIMDAL
|
|
ret = krb5_set_trace_callback(krb5_ctx, smb_krb5_trace_cb, NULL);
|
|
if (ret) {
|
|
DBG_ERR("Failed to set MIT kerberos trace callback! (%s)\n",
|
|
error_message(ret));
|
|
}
|
|
#endif
|
|
|
|
#ifdef SAMBA4_USES_HEIMDAL
|
|
/* Set options in kerberos */
|
|
krb5_set_dns_canonicalize_hostname(krb5_ctx, false);
|
|
#endif
|
|
|
|
*_krb5_context = krb5_ctx;
|
|
return 0;
|
|
}
|
|
|
|
#else /* HAVE_KRB5 */
|
|
/* This saves a few linking headaches */
|
|
int ads_krb5_cli_get_ticket(TALLOC_CTX *mem_ctx,
|
|
const char *principal,
|
|
time_t time_offset,
|
|
DATA_BLOB *ticket,
|
|
DATA_BLOB *session_key_krb5,
|
|
uint32_t extra_ap_opts, const char *ccname,
|
|
time_t *tgs_expire,
|
|
const char *impersonate_princ_s)
|
|
{
|
|
DEBUG(0,("NO KERBEROS SUPPORT\n"));
|
|
return 1;
|
|
}
|
|
|
|
#endif /* HAVE_KRB5 */
|