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samba-mirror/auth/credentials/credentials.c
Andreas Schneider 654a66b72d auth:credentials: Avoid an 'else' branch
This moves the 'return' statement to the end of the 'case' and makes clear
we leave here.

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2018-03-01 14:49:45 +01:00

1347 lines
36 KiB
C

/*
Unix SMB/CIFS implementation.
User credentials handling
Copyright (C) Jelmer Vernooij 2005
Copyright (C) Tim Potter 2001
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
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 "librpc/gen_ndr/samr.h" /* for struct samrPassword */
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_internal.h"
#include "auth/gensec/gensec.h"
#include "libcli/auth/libcli_auth.h"
#include "tevent.h"
#include "param/param.h"
#include "system/filesys.h"
/**
* Create a new credentials structure
* @param mem_ctx TALLOC_CTX parent for credentials structure
*/
_PUBLIC_ struct cli_credentials *cli_credentials_init(TALLOC_CTX *mem_ctx)
{
struct cli_credentials *cred = talloc_zero(mem_ctx, struct cli_credentials);
if (cred == NULL) {
return cred;
}
cred->winbind_separator = '\\';
return cred;
}
_PUBLIC_ void cli_credentials_set_callback_data(struct cli_credentials *cred,
void *callback_data)
{
cred->priv_data = callback_data;
}
_PUBLIC_ void *_cli_credentials_callback_data(struct cli_credentials *cred)
{
return cred->priv_data;
}
/**
* Create a new anonymous credential
* @param mem_ctx TALLOC_CTX parent for credentials structure
*/
_PUBLIC_ struct cli_credentials *cli_credentials_init_anon(TALLOC_CTX *mem_ctx)
{
struct cli_credentials *anon_credentials;
anon_credentials = cli_credentials_init(mem_ctx);
cli_credentials_set_anonymous(anon_credentials);
return anon_credentials;
}
_PUBLIC_ void cli_credentials_set_kerberos_state(struct cli_credentials *creds,
enum credentials_use_kerberos use_kerberos)
{
creds->use_kerberos = use_kerberos;
}
_PUBLIC_ void cli_credentials_set_forced_sasl_mech(struct cli_credentials *creds,
const char *sasl_mech)
{
TALLOC_FREE(creds->forced_sasl_mech);
creds->forced_sasl_mech = talloc_strdup(creds, sasl_mech);
}
_PUBLIC_ void cli_credentials_set_krb_forwardable(struct cli_credentials *creds,
enum credentials_krb_forwardable krb_forwardable)
{
creds->krb_forwardable = krb_forwardable;
}
_PUBLIC_ enum credentials_use_kerberos cli_credentials_get_kerberos_state(struct cli_credentials *creds)
{
return creds->use_kerberos;
}
_PUBLIC_ const char *cli_credentials_get_forced_sasl_mech(struct cli_credentials *creds)
{
return creds->forced_sasl_mech;
}
_PUBLIC_ enum credentials_krb_forwardable cli_credentials_get_krb_forwardable(struct cli_credentials *creds)
{
return creds->krb_forwardable;
}
_PUBLIC_ void cli_credentials_set_gensec_features(struct cli_credentials *creds, uint32_t gensec_features)
{
creds->gensec_features = gensec_features;
}
_PUBLIC_ uint32_t cli_credentials_get_gensec_features(struct cli_credentials *creds)
{
return creds->gensec_features;
}
/**
* Obtain the username for this credentials context.
* @param cred credentials context
* @retval The username set on this context.
* @note Return value will never be NULL except by programmer error.
*/
_PUBLIC_ const char *cli_credentials_get_username(struct cli_credentials *cred)
{
if (cred->machine_account_pending) {
cli_credentials_set_machine_account(cred,
cred->machine_account_pending_lp_ctx);
}
if (cred->username_obtained == CRED_CALLBACK &&
!cred->callback_running) {
cred->callback_running = true;
cred->username = cred->username_cb(cred);
cred->callback_running = false;
if (cred->username_obtained == CRED_CALLBACK) {
cred->username_obtained = CRED_CALLBACK_RESULT;
cli_credentials_invalidate_ccache(cred, cred->username_obtained);
}
}
return cred->username;
}
_PUBLIC_ bool cli_credentials_set_username(struct cli_credentials *cred,
const char *val, enum credentials_obtained obtained)
{
if (obtained >= cred->username_obtained) {
cred->username = talloc_strdup(cred, val);
cred->username_obtained = obtained;
cli_credentials_invalidate_ccache(cred, cred->username_obtained);
return true;
}
return false;
}
_PUBLIC_ bool cli_credentials_set_username_callback(struct cli_credentials *cred,
const char *(*username_cb) (struct cli_credentials *))
{
if (cred->username_obtained < CRED_CALLBACK) {
cred->username_cb = username_cb;
cred->username_obtained = CRED_CALLBACK;
return true;
}
return false;
}
_PUBLIC_ bool cli_credentials_set_bind_dn(struct cli_credentials *cred,
const char *bind_dn)
{
cred->bind_dn = talloc_strdup(cred, bind_dn);
return true;
}
/**
* Obtain the BIND DN for this credentials context.
* @param cred credentials context
* @retval The username set on this context.
* @note Return value will be NULL if not specified explictly
*/
_PUBLIC_ const char *cli_credentials_get_bind_dn(struct cli_credentials *cred)
{
return cred->bind_dn;
}
/**
* Obtain the client principal for this credentials context.
* @param cred credentials context
* @retval The username set on this context.
* @note Return value will never be NULL except by programmer error.
*/
_PUBLIC_ char *cli_credentials_get_principal_and_obtained(struct cli_credentials *cred, TALLOC_CTX *mem_ctx, enum credentials_obtained *obtained)
{
if (cred->machine_account_pending) {
cli_credentials_set_machine_account(cred,
cred->machine_account_pending_lp_ctx);
}
if (cred->principal_obtained == CRED_CALLBACK &&
!cred->callback_running) {
cred->callback_running = true;
cred->principal = cred->principal_cb(cred);
cred->callback_running = false;
if (cred->principal_obtained == CRED_CALLBACK) {
cred->principal_obtained = CRED_CALLBACK_RESULT;
cli_credentials_invalidate_ccache(cred, cred->principal_obtained);
}
}
if (cred->principal_obtained < cred->username_obtained
|| cred->principal_obtained < MAX(cred->domain_obtained, cred->realm_obtained)) {
const char *effective_username = NULL;
const char *effective_realm = NULL;
enum credentials_obtained effective_obtained;
effective_username = cli_credentials_get_username(cred);
if (effective_username == NULL || strlen(effective_username) == 0) {
*obtained = cred->username_obtained;
return NULL;
}
if (cred->domain_obtained > cred->realm_obtained) {
effective_realm = cli_credentials_get_domain(cred);
effective_obtained = MIN(cred->domain_obtained,
cred->username_obtained);
} else {
effective_realm = cli_credentials_get_realm(cred);
effective_obtained = MIN(cred->realm_obtained,
cred->username_obtained);
}
if (effective_realm == NULL || strlen(effective_realm) == 0) {
effective_realm = cli_credentials_get_domain(cred);
effective_obtained = MIN(cred->domain_obtained,
cred->username_obtained);
}
if (effective_realm != NULL && strlen(effective_realm) != 0) {
*obtained = effective_obtained;
return talloc_asprintf(mem_ctx, "%s@%s",
effective_username,
effective_realm);
}
}
*obtained = cred->principal_obtained;
return talloc_strdup(mem_ctx, cred->principal);
}
/**
* Obtain the client principal for this credentials context.
* @param cred credentials context
* @retval The username set on this context.
* @note Return value will never be NULL except by programmer error.
*/
_PUBLIC_ char *cli_credentials_get_principal(struct cli_credentials *cred, TALLOC_CTX *mem_ctx)
{
enum credentials_obtained obtained;
return cli_credentials_get_principal_and_obtained(cred, mem_ctx, &obtained);
}
_PUBLIC_ bool cli_credentials_set_principal(struct cli_credentials *cred,
const char *val,
enum credentials_obtained obtained)
{
if (obtained >= cred->principal_obtained) {
cred->principal = talloc_strdup(cred, val);
if (cred->principal == NULL) {
return false;
}
cred->principal_obtained = obtained;
cli_credentials_invalidate_ccache(cred, cred->principal_obtained);
return true;
}
return false;
}
/* Set a callback to get the principal. This could be a popup dialog,
* a terminal prompt or similar. */
_PUBLIC_ bool cli_credentials_set_principal_callback(struct cli_credentials *cred,
const char *(*principal_cb) (struct cli_credentials *))
{
if (cred->principal_obtained < CRED_CALLBACK) {
cred->principal_cb = principal_cb;
cred->principal_obtained = CRED_CALLBACK;
return true;
}
return false;
}
/* Some of our tools are 'anonymous by default'. This is a single
* function to determine if authentication has been explicitly
* requested */
_PUBLIC_ bool cli_credentials_authentication_requested(struct cli_credentials *cred)
{
uint32_t gensec_features = 0;
if (cred->bind_dn) {
return true;
}
/*
* If we forced the mech we clearly want authentication. E.g. to use
* SASL/EXTERNAL which has no credentials.
*/
if (cred->forced_sasl_mech) {
return true;
}
if (cli_credentials_is_anonymous(cred)){
return false;
}
if (cred->principal_obtained >= CRED_SPECIFIED) {
return true;
}
if (cred->username_obtained >= CRED_SPECIFIED) {
return true;
}
if (cli_credentials_get_kerberos_state(cred) == CRED_MUST_USE_KERBEROS) {
return true;
}
gensec_features = cli_credentials_get_gensec_features(cred);
if (gensec_features & GENSEC_FEATURE_NTLM_CCACHE) {
return true;
}
if (gensec_features & GENSEC_FEATURE_SIGN) {
return true;
}
if (gensec_features & GENSEC_FEATURE_SEAL) {
return true;
}
return false;
}
/**
* Obtain the password for this credentials context.
* @param cred credentials context
* @retval If set, the cleartext password, otherwise NULL
*/
_PUBLIC_ const char *cli_credentials_get_password(struct cli_credentials *cred)
{
if (cred->machine_account_pending) {
cli_credentials_set_machine_account(cred,
cred->machine_account_pending_lp_ctx);
}
if (cred->password_obtained == CRED_CALLBACK &&
!cred->callback_running &&
!cred->password_will_be_nt_hash) {
cred->callback_running = true;
cred->password = cred->password_cb(cred);
cred->callback_running = false;
if (cred->password_obtained == CRED_CALLBACK) {
cred->password_obtained = CRED_CALLBACK_RESULT;
cli_credentials_invalidate_ccache(cred, cred->password_obtained);
}
}
return cred->password;
}
/* Set a password on the credentials context, including an indication
* of 'how' the password was obtained */
_PUBLIC_ bool cli_credentials_set_password(struct cli_credentials *cred,
const char *val,
enum credentials_obtained obtained)
{
if (obtained >= cred->password_obtained) {
cred->lm_response = data_blob_null;
cred->nt_response = data_blob_null;
cred->nt_hash = NULL;
cred->password = NULL;
cli_credentials_invalidate_ccache(cred, obtained);
cred->password_tries = 0;
if (val == NULL) {
cred->password_obtained = obtained;
return true;
}
if (cred->password_will_be_nt_hash) {
struct samr_Password *nt_hash = NULL;
size_t val_len = strlen(val);
size_t converted;
nt_hash = talloc(cred, struct samr_Password);
if (nt_hash == NULL) {
return false;
}
converted = strhex_to_str((char *)nt_hash->hash,
sizeof(nt_hash->hash),
val, val_len);
if (converted != sizeof(nt_hash->hash)) {
TALLOC_FREE(nt_hash);
return false;
}
cred->nt_hash = nt_hash;
cred->password_obtained = obtained;
return true;
}
cred->password = talloc_strdup(cred, val);
if (cred->password == NULL) {
return false;
}
/* Don't print the actual password in talloc memory dumps */
talloc_set_name_const(cred->password,
"password set via cli_credentials_set_password");
cred->password_obtained = obtained;
return true;
}
return false;
}
_PUBLIC_ bool cli_credentials_set_password_callback(struct cli_credentials *cred,
const char *(*password_cb) (struct cli_credentials *))
{
if (cred->password_obtained < CRED_CALLBACK) {
cred->password_tries = 3;
cred->password_cb = password_cb;
cred->password_obtained = CRED_CALLBACK;
cli_credentials_invalidate_ccache(cred, cred->password_obtained);
return true;
}
return false;
}
/**
* Obtain the 'old' password for this credentials context (used for join accounts).
* @param cred credentials context
* @retval If set, the cleartext password, otherwise NULL
*/
_PUBLIC_ const char *cli_credentials_get_old_password(struct cli_credentials *cred)
{
if (cred->machine_account_pending) {
cli_credentials_set_machine_account(cred,
cred->machine_account_pending_lp_ctx);
}
return cred->old_password;
}
_PUBLIC_ bool cli_credentials_set_old_password(struct cli_credentials *cred,
const char *val,
enum credentials_obtained obtained)
{
cred->old_password = talloc_strdup(cred, val);
if (cred->old_password) {
/* Don't print the actual password in talloc memory dumps */
talloc_set_name_const(cred->old_password, "password set via cli_credentials_set_old_password");
}
cred->old_nt_hash = NULL;
return true;
}
/**
* Obtain the password, in the form MD4(unicode(password)) for this credentials context.
*
* Sometimes we only have this much of the password, while the rest of
* the time this call avoids calling E_md4hash themselves.
*
* @param cred credentials context
* @retval If set, the cleartext password, otherwise NULL
*/
_PUBLIC_ struct samr_Password *cli_credentials_get_nt_hash(struct cli_credentials *cred,
TALLOC_CTX *mem_ctx)
{
enum credentials_obtained password_obtained;
enum credentials_obtained ccache_threshold;
enum credentials_obtained client_gss_creds_threshold;
bool password_is_nt_hash;
const char *password = NULL;
struct samr_Password *nt_hash = NULL;
if (cred->nt_hash != NULL) {
/*
* If we already have a hash it's easy.
*/
goto return_hash;
}
/*
* This is a bit tricky, with password_will_be_nt_hash
* we still need to get the value via the password_callback
* but if we did that we should not remember it's state
* in the long run so we need to undo it.
*/
password_obtained = cred->password_obtained;
ccache_threshold = cred->ccache_threshold;
client_gss_creds_threshold = cred->client_gss_creds_threshold;
password_is_nt_hash = cred->password_will_be_nt_hash;
cred->password_will_be_nt_hash = false;
password = cli_credentials_get_password(cred);
cred->password_will_be_nt_hash = password_is_nt_hash;
if (password_is_nt_hash && password_obtained == CRED_CALLBACK) {
/*
* We got the nt_hash as string via the callback,
* so we need to undo the state change.
*
* And also don't remember it as plaintext password.
*/
cred->client_gss_creds_threshold = client_gss_creds_threshold;
cred->ccache_threshold = ccache_threshold;
cred->password_obtained = password_obtained;
cred->password = NULL;
}
if (password == NULL) {
return NULL;
}
nt_hash = talloc(cred, struct samr_Password);
if (nt_hash == NULL) {
return NULL;
}
if (password_is_nt_hash) {
size_t password_len = strlen(password);
size_t converted;
converted = strhex_to_str((char *)nt_hash->hash,
sizeof(nt_hash->hash),
password, password_len);
if (converted != sizeof(nt_hash->hash)) {
TALLOC_FREE(nt_hash);
return NULL;
}
} else {
E_md4hash(password, nt_hash->hash);
}
cred->nt_hash = nt_hash;
nt_hash = NULL;
return_hash:
nt_hash = talloc(mem_ctx, struct samr_Password);
if (nt_hash == NULL) {
return NULL;
}
*nt_hash = *cred->nt_hash;
return nt_hash;
}
/**
* Obtain the old password, in the form MD4(unicode(password)) for this credentials context.
*
* Sometimes we only have this much of the password, while the rest of
* the time this call avoids calling E_md4hash themselves.
*
* @param cred credentials context
* @retval If set, the cleartext password, otherwise NULL
*/
_PUBLIC_ struct samr_Password *cli_credentials_get_old_nt_hash(struct cli_credentials *cred,
TALLOC_CTX *mem_ctx)
{
const char *old_password = NULL;
if (cred->old_nt_hash != NULL) {
struct samr_Password *nt_hash = talloc(mem_ctx, struct samr_Password);
if (!nt_hash) {
return NULL;
}
*nt_hash = *cred->old_nt_hash;
return nt_hash;
}
old_password = cli_credentials_get_old_password(cred);
if (old_password) {
struct samr_Password *nt_hash = talloc(mem_ctx, struct samr_Password);
if (!nt_hash) {
return NULL;
}
E_md4hash(old_password, nt_hash->hash);
return nt_hash;
}
return NULL;
}
/**
* Obtain the 'short' or 'NetBIOS' domain for this credentials context.
* @param cred credentials context
* @retval The domain set on this context.
* @note Return value will never be NULL except by programmer error.
*/
_PUBLIC_ const char *cli_credentials_get_domain(struct cli_credentials *cred)
{
if (cred->machine_account_pending) {
cli_credentials_set_machine_account(cred,
cred->machine_account_pending_lp_ctx);
}
if (cred->domain_obtained == CRED_CALLBACK &&
!cred->callback_running) {
cred->callback_running = true;
cred->domain = cred->domain_cb(cred);
cred->callback_running = false;
if (cred->domain_obtained == CRED_CALLBACK) {
cred->domain_obtained = CRED_CALLBACK_RESULT;
cli_credentials_invalidate_ccache(cred, cred->domain_obtained);
}
}
return cred->domain;
}
_PUBLIC_ bool cli_credentials_set_domain(struct cli_credentials *cred,
const char *val,
enum credentials_obtained obtained)
{
if (obtained >= cred->domain_obtained) {
/* it is important that the domain be in upper case,
* particularly for the sensitive NTLMv2
* calculations */
cred->domain = strupper_talloc(cred, val);
cred->domain_obtained = obtained;
/* setting domain does not mean we have to invalidate ccache
* because domain in not used for Kerberos operations.
* If ccache invalidation is required, one will anyway specify
* a password to kinit, and that will force invalidation of the ccache
*/
return true;
}
return false;
}
bool cli_credentials_set_domain_callback(struct cli_credentials *cred,
const char *(*domain_cb) (struct cli_credentials *))
{
if (cred->domain_obtained < CRED_CALLBACK) {
cred->domain_cb = domain_cb;
cred->domain_obtained = CRED_CALLBACK;
return true;
}
return false;
}
/**
* Obtain the Kerberos realm for this credentials context.
* @param cred credentials context
* @retval The realm set on this context.
* @note Return value will never be NULL except by programmer error.
*/
_PUBLIC_ const char *cli_credentials_get_realm(struct cli_credentials *cred)
{
if (cred->machine_account_pending) {
cli_credentials_set_machine_account(cred,
cred->machine_account_pending_lp_ctx);
}
if (cred->realm_obtained == CRED_CALLBACK &&
!cred->callback_running) {
cred->callback_running = true;
cred->realm = cred->realm_cb(cred);
cred->callback_running = false;
if (cred->realm_obtained == CRED_CALLBACK) {
cred->realm_obtained = CRED_CALLBACK_RESULT;
cli_credentials_invalidate_ccache(cred, cred->realm_obtained);
}
}
return cred->realm;
}
/**
* Set the realm for this credentials context, and force it to
* uppercase for the sanity of our local kerberos libraries
*/
_PUBLIC_ bool cli_credentials_set_realm(struct cli_credentials *cred,
const char *val,
enum credentials_obtained obtained)
{
if (obtained >= cred->realm_obtained) {
cred->realm = strupper_talloc(cred, val);
cred->realm_obtained = obtained;
cli_credentials_invalidate_ccache(cred, cred->realm_obtained);
return true;
}
return false;
}
bool cli_credentials_set_realm_callback(struct cli_credentials *cred,
const char *(*realm_cb) (struct cli_credentials *))
{
if (cred->realm_obtained < CRED_CALLBACK) {
cred->realm_cb = realm_cb;
cred->realm_obtained = CRED_CALLBACK;
return true;
}
return false;
}
/**
* Obtain the 'short' or 'NetBIOS' workstation name for this credentials context.
*
* @param cred credentials context
* @retval The workstation name set on this context.
* @note Return value will never be NULL except by programmer error.
*/
_PUBLIC_ const char *cli_credentials_get_workstation(struct cli_credentials *cred)
{
if (cred->workstation_obtained == CRED_CALLBACK &&
!cred->callback_running) {
cred->callback_running = true;
cred->workstation = cred->workstation_cb(cred);
cred->callback_running = false;
if (cred->workstation_obtained == CRED_CALLBACK) {
cred->workstation_obtained = CRED_CALLBACK_RESULT;
}
}
return cred->workstation;
}
_PUBLIC_ bool cli_credentials_set_workstation(struct cli_credentials *cred,
const char *val,
enum credentials_obtained obtained)
{
if (obtained >= cred->workstation_obtained) {
cred->workstation = talloc_strdup(cred, val);
cred->workstation_obtained = obtained;
return true;
}
return false;
}
bool cli_credentials_set_workstation_callback(struct cli_credentials *cred,
const char *(*workstation_cb) (struct cli_credentials *))
{
if (cred->workstation_obtained < CRED_CALLBACK) {
cred->workstation_cb = workstation_cb;
cred->workstation_obtained = CRED_CALLBACK;
return true;
}
return false;
}
/**
* Given a string, typically obtained from a -U argument, parse it into domain, username, realm and password fields
*
* The format accepted is [domain\\]user[%password] or user[@realm][%password]
*
* @param credentials Credentials structure on which to set the password
* @param data the string containing the username, password etc
* @param obtained This enum describes how 'specified' this password is
*/
_PUBLIC_ void cli_credentials_parse_string(struct cli_credentials *credentials, const char *data, enum credentials_obtained obtained)
{
char *uname, *p;
if (strcmp("%",data) == 0) {
cli_credentials_set_anonymous(credentials);
return;
}
uname = talloc_strdup(credentials, data);
if ((p = strchr_m(uname,'%'))) {
*p = 0;
cli_credentials_set_password(credentials, p+1, obtained);
}
if ((p = strchr_m(uname,'@'))) {
/*
* We also need to set username and domain
* in order to undo the effect of
* cli_credentials_guess().
*/
cli_credentials_set_username(credentials, uname, obtained);
cli_credentials_set_domain(credentials, "", obtained);
cli_credentials_set_principal(credentials, uname, obtained);
*p = 0;
cli_credentials_set_realm(credentials, p+1, obtained);
return;
} else if ((p = strchr_m(uname,'\\'))
|| (p = strchr_m(uname, '/'))
|| (p = strchr_m(uname, credentials->winbind_separator)))
{
const char *domain = NULL;
domain = uname;
*p = 0;
uname = p+1;
if (obtained == credentials->realm_obtained &&
!strequal_m(credentials->domain, domain))
{
/*
* We need to undo a former set with the same level
* in order to get the expected result from
* cli_credentials_get_principal().
*
* But we only need to do that if the domain
* actually changes.
*/
cli_credentials_set_realm(credentials, domain, obtained);
}
cli_credentials_set_domain(credentials, domain, obtained);
}
if (obtained == credentials->principal_obtained &&
!strequal_m(credentials->username, uname))
{
/*
* We need to undo a former set with the same level
* in order to get the expected result from
* cli_credentials_get_principal().
*
* But we only need to do that if the username
* actually changes.
*/
credentials->principal_obtained = CRED_UNINITIALISED;
credentials->principal = NULL;
}
cli_credentials_set_username(credentials, uname, obtained);
}
/**
* Given a a credentials structure, print it as a string
*
* The format output is [domain\\]user[%password] or user[@realm][%password]
*
* @param credentials Credentials structure on which to set the password
* @param mem_ctx The memory context to place the result on
*/
_PUBLIC_ char *cli_credentials_get_unparsed_name(struct cli_credentials *credentials, TALLOC_CTX *mem_ctx)
{
const char *bind_dn = cli_credentials_get_bind_dn(credentials);
const char *domain = NULL;
const char *username = NULL;
char *name = NULL;
if (bind_dn) {
name = talloc_strdup(mem_ctx, bind_dn);
} else {
cli_credentials_get_ntlm_username_domain(credentials, mem_ctx, &username, &domain);
if (domain && domain[0]) {
name = talloc_asprintf(mem_ctx, "%s\\%s",
domain, username);
} else {
name = talloc_asprintf(mem_ctx, "%s",
username);
}
}
return name;
}
/**
* Specifies default values for domain, workstation and realm
* from the smb.conf configuration file
*
* @param cred Credentials structure to fill in
*/
_PUBLIC_ void cli_credentials_set_conf(struct cli_credentials *cred,
struct loadparm_context *lp_ctx)
{
const char *sep = NULL;
const char *realm = lpcfg_realm(lp_ctx);
cli_credentials_set_username(cred, "", CRED_UNINITIALISED);
if (lpcfg_parm_is_cmdline(lp_ctx, "workgroup")) {
cli_credentials_set_domain(cred, lpcfg_workgroup(lp_ctx), CRED_SPECIFIED);
} else {
cli_credentials_set_domain(cred, lpcfg_workgroup(lp_ctx), CRED_UNINITIALISED);
}
if (lpcfg_parm_is_cmdline(lp_ctx, "netbios name")) {
cli_credentials_set_workstation(cred, lpcfg_netbios_name(lp_ctx), CRED_SPECIFIED);
} else {
cli_credentials_set_workstation(cred, lpcfg_netbios_name(lp_ctx), CRED_UNINITIALISED);
}
if (realm != NULL && strlen(realm) == 0) {
realm = NULL;
}
if (lpcfg_parm_is_cmdline(lp_ctx, "realm")) {
cli_credentials_set_realm(cred, realm, CRED_SPECIFIED);
} else {
cli_credentials_set_realm(cred, realm, CRED_UNINITIALISED);
}
sep = lpcfg_winbind_separator(lp_ctx);
if (sep != NULL && sep[0] != '\0') {
cred->winbind_separator = *lpcfg_winbind_separator(lp_ctx);
}
}
/**
* Guess defaults for credentials from environment variables,
* and from the configuration file
*
* @param cred Credentials structure to fill in
*/
_PUBLIC_ void cli_credentials_guess(struct cli_credentials *cred,
struct loadparm_context *lp_ctx)
{
char *p;
const char *error_string;
if (lp_ctx != NULL) {
cli_credentials_set_conf(cred, lp_ctx);
}
if (getenv("LOGNAME")) {
cli_credentials_set_username(cred, getenv("LOGNAME"), CRED_GUESS_ENV);
}
if (getenv("USER")) {
cli_credentials_parse_string(cred, getenv("USER"), CRED_GUESS_ENV);
if ((p = strchr_m(getenv("USER"),'%'))) {
memset(p,0,strlen(cred->password));
}
}
if (getenv("PASSWD")) {
cli_credentials_set_password(cred, getenv("PASSWD"), CRED_GUESS_ENV);
}
if (getenv("PASSWD_FD")) {
cli_credentials_parse_password_fd(cred, atoi(getenv("PASSWD_FD")),
CRED_GUESS_FILE);
}
p = getenv("PASSWD_FILE");
if (p && p[0]) {
cli_credentials_parse_password_file(cred, p, CRED_GUESS_FILE);
}
if (cli_credentials_get_kerberos_state(cred) != CRED_DONT_USE_KERBEROS) {
cli_credentials_set_ccache(cred, lp_ctx, NULL, CRED_GUESS_FILE,
&error_string);
}
}
/**
* Attach NETLOGON credentials for use with SCHANNEL
*/
_PUBLIC_ void cli_credentials_set_netlogon_creds(
struct cli_credentials *cred,
const struct netlogon_creds_CredentialState *netlogon_creds)
{
TALLOC_FREE(cred->netlogon_creds);
if (netlogon_creds == NULL) {
return;
}
cred->netlogon_creds = netlogon_creds_copy(cred, netlogon_creds);
}
/**
* Return attached NETLOGON credentials
*/
_PUBLIC_ struct netlogon_creds_CredentialState *cli_credentials_get_netlogon_creds(struct cli_credentials *cred)
{
return cred->netlogon_creds;
}
/**
* Set NETLOGON secure channel type
*/
_PUBLIC_ void cli_credentials_set_secure_channel_type(struct cli_credentials *cred,
enum netr_SchannelType secure_channel_type)
{
cred->secure_channel_type = secure_channel_type;
}
/**
* Return NETLOGON secure chanel type
*/
_PUBLIC_ time_t cli_credentials_get_password_last_changed_time(struct cli_credentials *cred)
{
return cred->password_last_changed_time;
}
/**
* Set NETLOGON secure channel type
*/
_PUBLIC_ void cli_credentials_set_password_last_changed_time(struct cli_credentials *cred,
time_t last_changed_time)
{
cred->password_last_changed_time = last_changed_time;
}
/**
* Return NETLOGON secure chanel type
*/
_PUBLIC_ enum netr_SchannelType cli_credentials_get_secure_channel_type(struct cli_credentials *cred)
{
return cred->secure_channel_type;
}
/**
* Fill in a credentials structure as the anonymous user
*/
_PUBLIC_ void cli_credentials_set_anonymous(struct cli_credentials *cred)
{
cli_credentials_set_username(cred, "", CRED_SPECIFIED);
cli_credentials_set_domain(cred, "", CRED_SPECIFIED);
cli_credentials_set_password(cred, NULL, CRED_SPECIFIED);
cli_credentials_set_principal(cred, NULL, CRED_SPECIFIED);
cli_credentials_set_realm(cred, NULL, CRED_SPECIFIED);
cli_credentials_set_workstation(cred, "", CRED_UNINITIALISED);
cli_credentials_set_kerberos_state(cred, CRED_DONT_USE_KERBEROS);
}
/**
* Describe a credentials context as anonymous or authenticated
* @retval true if anonymous, false if a username is specified
*/
_PUBLIC_ bool cli_credentials_is_anonymous(struct cli_credentials *cred)
{
const char *username;
/* if bind dn is set it's not anonymous */
if (cred->bind_dn) {
return false;
}
if (cred->machine_account_pending) {
cli_credentials_set_machine_account(cred,
cred->machine_account_pending_lp_ctx);
}
/* if principal is set, it's not anonymous */
if ((cred->principal != NULL) && cred->principal_obtained >= cred->username_obtained) {
return false;
}
username = cli_credentials_get_username(cred);
/* Yes, it is deliberate that we die if we have a NULL pointer
* here - anonymous is "", not NULL, which is 'never specified,
* never guessed', ie programmer bug */
if (!username[0]) {
return true;
}
return false;
}
/**
* Mark the current password for a credentials struct as wrong. This will
* cause the password to be prompted again (if a callback is set).
*
* This will decrement the number of times the password can be tried.
*
* @retval whether the credentials struct is finished
*/
_PUBLIC_ bool cli_credentials_wrong_password(struct cli_credentials *cred)
{
if (cred->password_obtained != CRED_CALLBACK_RESULT) {
return false;
}
if (cred->password_tries == 0) {
return false;
}
cred->password_tries--;
if (cred->password_tries == 0) {
return false;
}
cred->password_obtained = CRED_CALLBACK;
return true;
}
_PUBLIC_ void cli_credentials_get_ntlm_username_domain(struct cli_credentials *cred, TALLOC_CTX *mem_ctx,
const char **username,
const char **domain)
{
if (cred->principal_obtained > cred->username_obtained) {
*domain = talloc_strdup(mem_ctx, "");
*username = cli_credentials_get_principal(cred, mem_ctx);
} else {
*domain = cli_credentials_get_domain(cred);
*username = cli_credentials_get_username(cred);
}
}
/**
* Read a named file, and parse it for username, domain, realm and password
*
* @param credentials Credentials structure on which to set the password
* @param file a named file to read the details from
* @param obtained This enum describes how 'specified' this password is
*/
_PUBLIC_ bool cli_credentials_parse_file(struct cli_credentials *cred, const char *file, enum credentials_obtained obtained)
{
uint16_t len = 0;
char *ptr, *val, *param;
char **lines;
int i, numlines;
const char *realm = NULL;
const char *domain = NULL;
const char *password = NULL;
const char *username = NULL;
lines = file_lines_load(file, &numlines, 0, NULL);
if (lines == NULL)
{
/* fail if we can't open the credentials file */
d_printf("ERROR: Unable to open credentials file!\n");
return false;
}
for (i = 0; i < numlines; i++) {
len = strlen(lines[i]);
if (len == 0)
continue;
/* break up the line into parameter & value.
* will need to eat a little whitespace possibly */
param = lines[i];
if (!(ptr = strchr_m (lines[i], '=')))
continue;
val = ptr+1;
*ptr = '\0';
/* eat leading white space */
while ((*val!='\0') && ((*val==' ') || (*val=='\t')))
val++;
if (strwicmp("password", param) == 0) {
password = val;
} else if (strwicmp("username", param) == 0) {
username = val;
} else if (strwicmp("domain", param) == 0) {
domain = val;
} else if (strwicmp("realm", param) == 0) {
realm = val;
}
/*
* We need to readd '=' in order to let
* the strlen() work in the last loop
* that clears the memory.
*/
*ptr = '=';
}
if (realm != NULL && strlen(realm) != 0) {
/*
* only overwrite with a valid string
*/
cli_credentials_set_realm(cred, realm, obtained);
}
if (domain != NULL && strlen(domain) != 0) {
/*
* only overwrite with a valid string
*/
cli_credentials_set_domain(cred, domain, obtained);
}
if (password != NULL) {
/*
* Here we allow "".
*/
cli_credentials_set_password(cred, password, obtained);
}
if (username != NULL) {
/*
* The last "username" line takes preference
* if the string also contains domain, realm or
* password.
*/
cli_credentials_parse_string(cred, username, obtained);
}
for (i = 0; i < numlines; i++) {
len = strlen(lines[i]);
memset(lines[i], 0, len);
}
talloc_free(lines);
return true;
}
/**
* Read a named file, and parse it for a password
*
* @param credentials Credentials structure on which to set the password
* @param file a named file to read the password from
* @param obtained This enum describes how 'specified' this password is
*/
_PUBLIC_ bool cli_credentials_parse_password_file(struct cli_credentials *credentials, const char *file, enum credentials_obtained obtained)
{
int fd = open(file, O_RDONLY, 0);
bool ret;
if (fd < 0) {
fprintf(stderr, "Error opening password file %s: %s\n",
file, strerror(errno));
return false;
}
ret = cli_credentials_parse_password_fd(credentials, fd, obtained);
close(fd);
return ret;
}
/**
* Read a file descriptor, and parse it for a password (eg from a file or stdin)
*
* @param credentials Credentials structure on which to set the password
* @param fd open file descriptor to read the password from
* @param obtained This enum describes how 'specified' this password is
*/
_PUBLIC_ bool cli_credentials_parse_password_fd(struct cli_credentials *credentials,
int fd, enum credentials_obtained obtained)
{
char *p;
char pass[128];
for(p = pass, *p = '\0'; /* ensure that pass is null-terminated */
p && p - pass < sizeof(pass);) {
switch (read(fd, p, 1)) {
case 1:
if (*p != '\n' && *p != '\0') {
*++p = '\0'; /* advance p, and null-terminate pass */
break;
}
FALL_THROUGH;
case 0:
if (p - pass) {
*p = '\0'; /* null-terminate it, just in case... */
p = NULL; /* then force the loop condition to become false */
break;
}
fprintf(stderr,
"Error reading password from file descriptor "
"%d: empty password\n",
fd);
return false;
default:
fprintf(stderr, "Error reading password from file descriptor %d: %s\n",
fd, strerror(errno));
return false;
}
}
cli_credentials_set_password(credentials, pass, obtained);
return true;
}
/**
* Encrypt a data blob using the session key and the negotiated encryption
* algorithm
*
* @param state Credential state, contains the session key and algorithm
* @param data Data blob containing the data to be encrypted.
*
*/
_PUBLIC_ NTSTATUS netlogon_creds_session_encrypt(
struct netlogon_creds_CredentialState *state,
DATA_BLOB data)
{
if (data.data == NULL || data.length == 0) {
DBG_ERR("Nothing to encrypt "
"data.data == NULL or data.length == 0");
return NT_STATUS_INVALID_PARAMETER;
}
/*
* Don't crypt an all-zero password it will give away the
* NETLOGON pipe session key .
*/
if (all_zero(data.data, data.length)) {
DBG_ERR("Supplied data all zeros, could leak session key");
return NT_STATUS_INVALID_PARAMETER;
}
if (state->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
netlogon_creds_aes_encrypt(state,
data.data,
data.length);
} else if (state->negotiate_flags & NETLOGON_NEG_ARCFOUR) {
netlogon_creds_arcfour_crypt(state,
data.data,
data.length);
} else {
DBG_ERR("Unsupported encryption option negotiated");
return NT_STATUS_NOT_SUPPORTED;
}
return NT_STATUS_OK;
}