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samba-mirror/nsswitch/pam_winbind.c
Björn Jacke 5377d5f894 pam_winbind: fix a printf type mismatch warning
2009-11-14 01:54:53 +01:00

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/* pam_winbind module
Copyright Andrew Tridgell <tridge@samba.org> 2000
Copyright Tim Potter <tpot@samba.org> 2000
Copyright Andrew Bartlett <abartlet@samba.org> 2002
Copyright Guenther Deschner <gd@samba.org> 2005-2008
largely based on pam_userdb by Cristian Gafton <gafton@redhat.com> also
contains large slabs of code from pam_unix by Elliot Lee
<sopwith@redhat.com> (see copyright below for full details)
*/
#include "pam_winbind.h"
#define CONST_DISCARD(type,ptr) ((type)(void *)ptr)
static int wbc_error_to_pam_error(wbcErr status)
{
switch (status) {
case WBC_ERR_SUCCESS:
return PAM_SUCCESS;
case WBC_ERR_NOT_IMPLEMENTED:
return PAM_SERVICE_ERR;
case WBC_ERR_UNKNOWN_FAILURE:
break;
case WBC_ERR_NO_MEMORY:
return PAM_BUF_ERR;
case WBC_ERR_INVALID_SID:
case WBC_ERR_INVALID_PARAM:
break;
case WBC_ERR_WINBIND_NOT_AVAILABLE:
return PAM_AUTHINFO_UNAVAIL;
case WBC_ERR_DOMAIN_NOT_FOUND:
return PAM_AUTHINFO_UNAVAIL;
case WBC_ERR_INVALID_RESPONSE:
return PAM_BUF_ERR;
case WBC_ERR_NSS_ERROR:
return PAM_USER_UNKNOWN;
case WBC_ERR_AUTH_ERROR:
return PAM_AUTH_ERR;
case WBC_ERR_UNKNOWN_USER:
return PAM_USER_UNKNOWN;
case WBC_ERR_UNKNOWN_GROUP:
return PAM_USER_UNKNOWN;
case WBC_ERR_PWD_CHANGE_FAILED:
break;
}
/* be paranoid */
return PAM_AUTH_ERR;
}
static const char *_pam_error_code_str(int err)
{
switch (err) {
case PAM_SUCCESS:
return "PAM_SUCCESS";
case PAM_OPEN_ERR:
return "PAM_OPEN_ERR";
case PAM_SYMBOL_ERR:
return "PAM_SYMBOL_ERR";
case PAM_SERVICE_ERR:
return "PAM_SERVICE_ERR";
case PAM_SYSTEM_ERR:
return "PAM_SYSTEM_ERR";
case PAM_BUF_ERR:
return "PAM_BUF_ERR";
case PAM_PERM_DENIED:
return "PAM_PERM_DENIED";
case PAM_AUTH_ERR:
return "PAM_AUTH_ERR";
case PAM_CRED_INSUFFICIENT:
return "PAM_CRED_INSUFFICIENT";
case PAM_AUTHINFO_UNAVAIL:
return "PAM_AUTHINFO_UNAVAIL";
case PAM_USER_UNKNOWN:
return "PAM_USER_UNKNOWN";
case PAM_MAXTRIES:
return "PAM_MAXTRIES";
case PAM_NEW_AUTHTOK_REQD:
return "PAM_NEW_AUTHTOK_REQD";
case PAM_ACCT_EXPIRED:
return "PAM_ACCT_EXPIRED";
case PAM_SESSION_ERR:
return "PAM_SESSION_ERR";
case PAM_CRED_UNAVAIL:
return "PAM_CRED_UNAVAIL";
case PAM_CRED_EXPIRED:
return "PAM_CRED_EXPIRED";
case PAM_CRED_ERR:
return "PAM_CRED_ERR";
case PAM_NO_MODULE_DATA:
return "PAM_NO_MODULE_DATA";
case PAM_CONV_ERR:
return "PAM_CONV_ERR";
case PAM_AUTHTOK_ERR:
return "PAM_AUTHTOK_ERR";
case PAM_AUTHTOK_RECOVER_ERR:
return "PAM_AUTHTOK_RECOVER_ERR";
case PAM_AUTHTOK_LOCK_BUSY:
return "PAM_AUTHTOK_LOCK_BUSY";
case PAM_AUTHTOK_DISABLE_AGING:
return "PAM_AUTHTOK_DISABLE_AGING";
case PAM_TRY_AGAIN:
return "PAM_TRY_AGAIN";
case PAM_IGNORE:
return "PAM_IGNORE";
case PAM_ABORT:
return "PAM_ABORT";
case PAM_AUTHTOK_EXPIRED:
return "PAM_AUTHTOK_EXPIRED";
#ifdef PAM_MODULE_UNKNOWN
case PAM_MODULE_UNKNOWN:
return "PAM_MODULE_UNKNOWN";
#endif
#ifdef PAM_BAD_ITEM
case PAM_BAD_ITEM:
return "PAM_BAD_ITEM";
#endif
#ifdef PAM_CONV_AGAIN
case PAM_CONV_AGAIN:
return "PAM_CONV_AGAIN";
#endif
#ifdef PAM_INCOMPLETE
case PAM_INCOMPLETE:
return "PAM_INCOMPLETE";
#endif
default:
return NULL;
}
}
#define _PAM_LOG_FUNCTION_ENTER(function, ctx) \
do { \
_pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] ENTER: " \
function " (flags: 0x%04x)", ctx->pamh, ctx->flags); \
_pam_log_state(ctx); \
} while (0)
#define _PAM_LOG_FUNCTION_LEAVE(function, ctx, retval) \
do { \
_pam_log_debug(ctx, LOG_DEBUG, "[pamh: %p] LEAVE: " \
function " returning %d (%s)", ctx->pamh, retval, \
_pam_error_code_str(retval)); \
_pam_log_state(ctx); \
} while (0)
/* data tokens */
#define MAX_PASSWD_TRIES 3
#ifdef HAVE_GETTEXT
static char initialized = 0;
static inline void textdomain_init(void);
static inline void textdomain_init(void)
{
if (!initialized) {
bindtextdomain(MODULE_NAME, dyn_LOCALEDIR);
initialized = 1;
}
return;
}
#endif
/*
* Work around the pam API that has functions with void ** as parameters
* These lead to strict aliasing warnings with gcc.
*/
static int _pam_get_item(const pam_handle_t *pamh,
int item_type,
const void *_item)
{
const void **item = (const void **)_item;
return pam_get_item(pamh, item_type, item);
}
static int _pam_get_data(const pam_handle_t *pamh,
const char *module_data_name,
const void *_data)
{
const void **data = (const void **)_data;
return pam_get_data(pamh, module_data_name, data);
}
/* some syslogging */
#ifdef HAVE_PAM_VSYSLOG
static void _pam_log_int(const pam_handle_t *pamh,
int err,
const char *format,
va_list args)
{
pam_vsyslog(pamh, err, format, args);
}
#else
static void _pam_log_int(const pam_handle_t *pamh,
int err,
const char *format,
va_list args)
{
char *format2 = NULL;
const char *service;
_pam_get_item(pamh, PAM_SERVICE, &service);
format2 = (char *)malloc(strlen(MODULE_NAME)+strlen(format)+strlen(service)+5);
if (format2 == NULL) {
/* what else todo ? */
vsyslog(err, format, args);
return;
}
sprintf(format2, "%s(%s): %s", MODULE_NAME, service, format);
vsyslog(err, format2, args);
SAFE_FREE(format2);
}
#endif /* HAVE_PAM_VSYSLOG */
static bool _pam_log_is_silent(int ctrl)
{
return on(ctrl, WINBIND_SILENT);
}
static void _pam_log(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
static void _pam_log(struct pwb_context *r, int err, const char *format, ...)
{
va_list args;
if (_pam_log_is_silent(r->ctrl)) {
return;
}
va_start(args, format);
_pam_log_int(r->pamh, err, format, args);
va_end(args);
}
static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
static void __pam_log(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
{
va_list args;
if (_pam_log_is_silent(ctrl)) {
return;
}
va_start(args, format);
_pam_log_int(pamh, err, format, args);
va_end(args);
}
static bool _pam_log_is_debug_enabled(int ctrl)
{
if (ctrl == -1) {
return false;
}
if (_pam_log_is_silent(ctrl)) {
return false;
}
if (!(ctrl & WINBIND_DEBUG_ARG)) {
return false;
}
return true;
}
static bool _pam_log_is_debug_state_enabled(int ctrl)
{
if (!(ctrl & WINBIND_DEBUG_STATE)) {
return false;
}
return _pam_log_is_debug_enabled(ctrl);
}
static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
static void _pam_log_debug(struct pwb_context *r, int err, const char *format, ...)
{
va_list args;
if (!_pam_log_is_debug_enabled(r->ctrl)) {
return;
}
va_start(args, format);
_pam_log_int(r->pamh, err, format, args);
va_end(args);
}
static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...) PRINTF_ATTRIBUTE(4,5);
static void __pam_log_debug(const pam_handle_t *pamh, int ctrl, int err, const char *format, ...)
{
va_list args;
if (!_pam_log_is_debug_enabled(ctrl)) {
return;
}
va_start(args, format);
_pam_log_int(pamh, err, format, args);
va_end(args);
}
static void _pam_log_state_datum(struct pwb_context *ctx,
int item_type,
const char *key,
int is_string)
{
const void *data = NULL;
if (item_type != 0) {
pam_get_item(ctx->pamh, item_type, &data);
} else {
pam_get_data(ctx->pamh, key, &data);
}
if (data != NULL) {
const char *type = (item_type != 0) ? "ITEM" : "DATA";
if (is_string != 0) {
_pam_log_debug(ctx, LOG_DEBUG,
"[pamh: %p] STATE: %s(%s) = \"%s\" (%p)",
ctx->pamh, type, key, (const char *)data,
data);
} else {
_pam_log_debug(ctx, LOG_DEBUG,
"[pamh: %p] STATE: %s(%s) = %p",
ctx->pamh, type, key, data);
}
}
}
#define _PAM_LOG_STATE_DATA_POINTER(ctx, module_data_name) \
_pam_log_state_datum(ctx, 0, module_data_name, 0)
#define _PAM_LOG_STATE_DATA_STRING(ctx, module_data_name) \
_pam_log_state_datum(ctx, 0, module_data_name, 1)
#define _PAM_LOG_STATE_ITEM_POINTER(ctx, item_type) \
_pam_log_state_datum(ctx, item_type, #item_type, 0)
#define _PAM_LOG_STATE_ITEM_STRING(ctx, item_type) \
_pam_log_state_datum(ctx, item_type, #item_type, 1)
#ifdef DEBUG_PASSWORD
#define _LOG_PASSWORD_AS_STRING 1
#else
#define _LOG_PASSWORD_AS_STRING 0
#endif
#define _PAM_LOG_STATE_ITEM_PASSWORD(ctx, item_type) \
_pam_log_state_datum(ctx, item_type, #item_type, \
_LOG_PASSWORD_AS_STRING)
static void _pam_log_state(struct pwb_context *ctx)
{
if (!_pam_log_is_debug_state_enabled(ctx->ctrl)) {
return;
}
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_SERVICE);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_TTY);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RHOST);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_RUSER);
_PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_OLDAUTHTOK);
_PAM_LOG_STATE_ITEM_PASSWORD(ctx, PAM_AUTHTOK);
_PAM_LOG_STATE_ITEM_STRING(ctx, PAM_USER_PROMPT);
_PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_CONV);
#ifdef PAM_FAIL_DELAY
_PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_FAIL_DELAY);
#endif
#ifdef PAM_REPOSITORY
_PAM_LOG_STATE_ITEM_POINTER(ctx, PAM_REPOSITORY);
#endif
_PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_HOMEDIR);
_PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSCRIPT);
_PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_LOGONSERVER);
_PAM_LOG_STATE_DATA_STRING(ctx, PAM_WINBIND_PROFILEPATH);
_PAM_LOG_STATE_DATA_STRING(ctx,
PAM_WINBIND_NEW_AUTHTOK_REQD);
/* Use atoi to get PAM result code */
_PAM_LOG_STATE_DATA_STRING(ctx,
PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH);
_PAM_LOG_STATE_DATA_POINTER(ctx, PAM_WINBIND_PWD_LAST_SET);
}
static int _pam_parse(const pam_handle_t *pamh,
int flags,
int argc,
const char **argv,
dictionary **result_d)
{
int ctrl = 0;
const char *config_file = NULL;
int i;
const char **v;
dictionary *d = NULL;
if (flags & PAM_SILENT) {
ctrl |= WINBIND_SILENT;
}
for (i=argc,v=argv; i-- > 0; ++v) {
if (!strncasecmp(*v, "config", strlen("config"))) {
ctrl |= WINBIND_CONFIG_FILE;
config_file = v[i];
break;
}
}
if (config_file == NULL) {
config_file = PAM_WINBIND_CONFIG_FILE;
}
d = iniparser_load(CONST_DISCARD(char *, config_file));
if (d == NULL) {
goto config_from_pam;
}
if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:debug"), false)) {
ctrl |= WINBIND_DEBUG_ARG;
}
if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:debug_state"), false)) {
ctrl |= WINBIND_DEBUG_STATE;
}
if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:cached_login"), false)) {
ctrl |= WINBIND_CACHED_LOGIN;
}
if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:krb5_auth"), false)) {
ctrl |= WINBIND_KRB5_AUTH;
}
if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:silent"), false)) {
ctrl |= WINBIND_SILENT;
}
if (iniparser_getstr(d, CONST_DISCARD(char *, "global:krb5_ccache_type")) != NULL) {
ctrl |= WINBIND_KRB5_CCACHE_TYPE;
}
if ((iniparser_getstr(d, CONST_DISCARD(char *, "global:require-membership-of"))
!= NULL) ||
(iniparser_getstr(d, CONST_DISCARD(char *, "global:require_membership_of"))
!= NULL)) {
ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
}
if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:try_first_pass"), false)) {
ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
}
if (iniparser_getint(d, CONST_DISCARD(char *, "global:warn_pwd_expire"), 0)) {
ctrl |= WINBIND_WARN_PWD_EXPIRE;
}
if (iniparser_getboolean(d, CONST_DISCARD(char *, "global:mkhomedir"), false)) {
ctrl |= WINBIND_MKHOMEDIR;
}
config_from_pam:
/* step through arguments */
for (i=argc,v=argv; i-- > 0; ++v) {
/* generic options */
if (!strcmp(*v,"debug"))
ctrl |= WINBIND_DEBUG_ARG;
else if (!strcasecmp(*v, "debug_state"))
ctrl |= WINBIND_DEBUG_STATE;
else if (!strcasecmp(*v, "silent"))
ctrl |= WINBIND_SILENT;
else if (!strcasecmp(*v, "use_authtok"))
ctrl |= WINBIND_USE_AUTHTOK_ARG;
else if (!strcasecmp(*v, "use_first_pass"))
ctrl |= WINBIND_USE_FIRST_PASS_ARG;
else if (!strcasecmp(*v, "try_first_pass"))
ctrl |= WINBIND_TRY_FIRST_PASS_ARG;
else if (!strcasecmp(*v, "unknown_ok"))
ctrl |= WINBIND_UNKNOWN_OK_ARG;
else if (!strncasecmp(*v, "require_membership_of",
strlen("require_membership_of")))
ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
else if (!strncasecmp(*v, "require-membership-of",
strlen("require-membership-of")))
ctrl |= WINBIND_REQUIRED_MEMBERSHIP;
else if (!strcasecmp(*v, "krb5_auth"))
ctrl |= WINBIND_KRB5_AUTH;
else if (!strncasecmp(*v, "krb5_ccache_type",
strlen("krb5_ccache_type")))
ctrl |= WINBIND_KRB5_CCACHE_TYPE;
else if (!strcasecmp(*v, "cached_login"))
ctrl |= WINBIND_CACHED_LOGIN;
else if (!strcasecmp(*v, "mkhomedir"))
ctrl |= WINBIND_MKHOMEDIR;
else {
__pam_log(pamh, ctrl, LOG_ERR,
"pam_parse: unknown option: %s", *v);
return -1;
}
}
if (result_d) {
*result_d = d;
} else {
if (d) {
iniparser_freedict(d);
}
}
return ctrl;
};
static int _pam_winbind_free_context(struct pwb_context *ctx)
{
if (!ctx) {
return 0;
}
if (ctx->dict) {
iniparser_freedict(ctx->dict);
}
return 0;
}
static int _pam_winbind_init_context(pam_handle_t *pamh,
int flags,
int argc,
const char **argv,
struct pwb_context **ctx_p)
{
struct pwb_context *r = NULL;
#ifdef HAVE_GETTEXT
textdomain_init();
#endif
r = TALLOC_ZERO_P(NULL, struct pwb_context);
if (!r) {
return PAM_BUF_ERR;
}
talloc_set_destructor(r, _pam_winbind_free_context);
r->pamh = pamh;
r->flags = flags;
r->argc = argc;
r->argv = argv;
r->ctrl = _pam_parse(pamh, flags, argc, argv, &r->dict);
if (r->ctrl == -1) {
TALLOC_FREE(r);
return PAM_SYSTEM_ERR;
}
*ctx_p = r;
return PAM_SUCCESS;
}
static void _pam_winbind_cleanup_func(pam_handle_t *pamh,
void *data,
int error_status)
{
int ctrl = _pam_parse(pamh, 0, 0, NULL, NULL);
if (_pam_log_is_debug_state_enabled(ctrl)) {
__pam_log_debug(pamh, ctrl, LOG_DEBUG,
"[pamh: %p] CLEAN: cleaning up PAM data %p "
"(error_status = %d)", pamh, data,
error_status);
}
TALLOC_FREE(data);
}
static const struct ntstatus_errors {
const char *ntstatus_string;
const char *error_string;
} ntstatus_errors[] = {
{"NT_STATUS_OK",
N_("Success")},
{"NT_STATUS_BACKUP_CONTROLLER",
N_("No primary Domain Controler available")},
{"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
N_("No domain controllers found")},
{"NT_STATUS_NO_LOGON_SERVERS",
N_("No logon servers")},
{"NT_STATUS_PWD_TOO_SHORT",
N_("Password too short")},
{"NT_STATUS_PWD_TOO_RECENT",
N_("The password of this user is too recent to change")},
{"NT_STATUS_PWD_HISTORY_CONFLICT",
N_("Password is already in password history")},
{"NT_STATUS_PASSWORD_EXPIRED",
N_("Your password has expired")},
{"NT_STATUS_PASSWORD_MUST_CHANGE",
N_("You need to change your password now")},
{"NT_STATUS_INVALID_WORKSTATION",
N_("You are not allowed to logon from this workstation")},
{"NT_STATUS_INVALID_LOGON_HOURS",
N_("You are not allowed to logon at this time")},
{"NT_STATUS_ACCOUNT_EXPIRED",
N_("Your account has expired. "
"Please contact your System administrator")}, /* SCNR */
{"NT_STATUS_ACCOUNT_DISABLED",
N_("Your account is disabled. "
"Please contact your System administrator")}, /* SCNR */
{"NT_STATUS_ACCOUNT_LOCKED_OUT",
N_("Your account has been locked. "
"Please contact your System administrator")}, /* SCNR */
{"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
N_("Invalid Trust Account")},
{"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
N_("Invalid Trust Account")},
{"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
N_("Invalid Trust Account")},
{"NT_STATUS_ACCESS_DENIED",
N_("Access is denied")},
{NULL, NULL}
};
static const char *_get_ntstatus_error_string(const char *nt_status_string)
{
int i;
for (i=0; ntstatus_errors[i].ntstatus_string != NULL; i++) {
if (!strcasecmp(ntstatus_errors[i].ntstatus_string,
nt_status_string)) {
return _(ntstatus_errors[i].error_string);
}
}
return NULL;
}
/* --- authentication management functions --- */
/* Attempt a conversation */
static int converse(const pam_handle_t *pamh,
int nargs,
struct pam_message **message,
struct pam_response **response)
{
int retval;
struct pam_conv *conv;
retval = _pam_get_item(pamh, PAM_CONV, &conv);
if (retval == PAM_SUCCESS) {
retval = conv->conv(nargs,
(const struct pam_message **)message,
response, conv->appdata_ptr);
}
return retval; /* propagate error status */
}
static int _make_remark(struct pwb_context *ctx,
int type,
const char *text)
{
int retval = PAM_SUCCESS;
struct pam_message *pmsg[1], msg[1];
struct pam_response *resp;
if (ctx->flags & WINBIND_SILENT) {
return PAM_SUCCESS;
}
pmsg[0] = &msg[0];
msg[0].msg = discard_const_p(char, text);
msg[0].msg_style = type;
resp = NULL;
retval = converse(ctx->pamh, 1, pmsg, &resp);
if (resp) {
_pam_drop_reply(resp, 1);
}
return retval;
}
static int _make_remark_v(struct pwb_context *ctx,
int type,
const char *format,
va_list args)
{
char *var;
int ret;
ret = vasprintf(&var, format, args);
if (ret < 0) {
_pam_log(ctx, LOG_ERR, "memory allocation failure");
return ret;
}
ret = _make_remark(ctx, type, var);
SAFE_FREE(var);
return ret;
}
static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...) PRINTF_ATTRIBUTE(3,4);
static int _make_remark_format(struct pwb_context *ctx, int type, const char *format, ...)
{
int ret;
va_list args;
va_start(args, format);
ret = _make_remark_v(ctx, type, format, args);
va_end(args);
return ret;
}
static int pam_winbind_request_log(struct pwb_context *ctx,
int retval,
const char *user,
const char *fn)
{
switch (retval) {
case PAM_AUTH_ERR:
/* incorrect password */
_pam_log(ctx, LOG_WARNING, "user '%s' denied access "
"(incorrect password or invalid membership)", user);
return retval;
case PAM_ACCT_EXPIRED:
/* account expired */
_pam_log(ctx, LOG_WARNING, "user '%s' account expired",
user);
return retval;
case PAM_AUTHTOK_EXPIRED:
/* password expired */
_pam_log(ctx, LOG_WARNING, "user '%s' password expired",
user);
return retval;
case PAM_NEW_AUTHTOK_REQD:
/* new password required */
_pam_log(ctx, LOG_WARNING, "user '%s' new password "
"required", user);
return retval;
case PAM_USER_UNKNOWN:
/* the user does not exist */
_pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
user);
if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
return PAM_IGNORE;
}
return retval;
case PAM_SUCCESS:
/* Otherwise, the authentication looked good */
if (strcmp(fn, "wbcLogonUser") == 0) {
_pam_log(ctx, LOG_NOTICE,
"user '%s' granted access", user);
} else {
_pam_log(ctx, LOG_NOTICE,
"user '%s' OK", user);
}
return retval;
default:
/* we don't know anything about this return value */
_pam_log(ctx, LOG_ERR,
"internal module error (retval = %s(%d), user = '%s')",
_pam_error_code_str(retval), retval, user);
return retval;
}
}
static int wbc_auth_error_to_pam_error(struct pwb_context *ctx,
struct wbcAuthErrorInfo *e,
wbcErr status,
const char *username,
const char *fn)
{
int ret = PAM_AUTH_ERR;
if (WBC_ERROR_IS_OK(status)) {
_pam_log_debug(ctx, LOG_DEBUG, "request %s succeeded",
fn);
ret = PAM_SUCCESS;
return pam_winbind_request_log(ctx, ret, username, fn);
}
if (e) {
if (e->pam_error != PAM_SUCCESS) {
_pam_log(ctx, LOG_ERR,
"request %s failed: %s, "
"PAM error: %s (%d), NTSTATUS: %s, "
"Error message was: %s",
fn,
wbcErrorString(status),
_pam_error_code_str(e->pam_error),
e->pam_error,
e->nt_string,
e->display_string);
ret = e->pam_error;
return pam_winbind_request_log(ctx, ret, username, fn);
}
_pam_log(ctx, LOG_ERR, "request %s failed, but PAM error 0!", fn);
ret = PAM_SERVICE_ERR;
return pam_winbind_request_log(ctx, ret, username, fn);
}
ret = wbc_error_to_pam_error(status);
return pam_winbind_request_log(ctx, ret, username, fn);
}
/**
* send a password expiry message if required
*
* @param ctx PAM winbind context.
* @param next_change expected (calculated) next expiry date.
* @param already_expired pointer to a boolean to indicate if the password is
* already expired.
*
* @return boolean Returns true if message has been sent, false if not.
*/
static bool _pam_send_password_expiry_message(struct pwb_context *ctx,
time_t next_change,
time_t now,
int warn_pwd_expire,
bool *already_expired)
{
int days = 0;
struct tm tm_now, tm_next_change;
if (already_expired) {
*already_expired = false;
}
if (next_change <= now) {
PAM_WB_REMARK_DIRECT(ctx, "NT_STATUS_PASSWORD_EXPIRED");
if (already_expired) {
*already_expired = true;
}
return true;
}
if ((next_change < 0) ||
(next_change > now + warn_pwd_expire * SECONDS_PER_DAY)) {
return false;
}
if ((localtime_r(&now, &tm_now) == NULL) ||
(localtime_r(&next_change, &tm_next_change) == NULL)) {
return false;
}
days = (tm_next_change.tm_yday+tm_next_change.tm_year*365) -
(tm_now.tm_yday+tm_now.tm_year*365);
if (days == 0) {
_make_remark(ctx, PAM_TEXT_INFO,
_("Your password expires today"));
return true;
}
if (days > 0 && days < warn_pwd_expire) {
_make_remark_format(ctx, PAM_TEXT_INFO,
_("Your password will expire in %d %s"),
days, (days > 1) ? _("days"):_("day"));
return true;
}
return false;
}
/**
* Send a warning if the password expires in the near future
*
* @param ctx PAM winbind context.
* @param response The full authentication response structure.
* @param already_expired boolean, is the pwd already expired?
*
* @return void.
*/
static void _pam_warn_password_expiry(struct pwb_context *ctx,
const struct wbcAuthUserInfo *info,
const struct wbcUserPasswordPolicyInfo *policy,
int warn_pwd_expire,
bool *already_expired)
{
time_t now = time(NULL);
time_t next_change = 0;
if (!info || !policy) {
return;
}
if (already_expired) {
*already_expired = false;
}
/* accounts with WBC_ACB_PWNOEXP set never receive a warning */
if (info->acct_flags & WBC_ACB_PWNOEXP) {
return;
}
/* no point in sending a warning if this is a grace logon */
if (PAM_WB_GRACE_LOGON(info->user_flags)) {
return;
}
/* check if the info3 must change timestamp has been set */
next_change = info->pass_must_change_time;
if (_pam_send_password_expiry_message(ctx, next_change, now,
warn_pwd_expire,
already_expired)) {
return;
}
/* now check for the global password policy */
/* good catch from Ralf Haferkamp: an expiry of "never" is translated
* to -1 */
if ((policy->expire == (int64_t)-1) ||
(policy->expire == 0)) {
return;
}
next_change = info->pass_last_set_time + policy->expire;
if (_pam_send_password_expiry_message(ctx, next_change, now,
warn_pwd_expire,
already_expired)) {
return;
}
/* no warning sent */
}
#define IS_SID_STRING(name) (strncmp("S-", name, 2) == 0)
/**
* Append a string, making sure not to overflow and to always return a
* NULL-terminated string.
*
* @param dest Destination string buffer (must already be NULL-terminated).
* @param src Source string buffer.
* @param dest_buffer_size Size of dest buffer in bytes.
*
* @return false if dest buffer is not big enough (no bytes copied), true on
* success.
*/
static bool safe_append_string(char *dest,
const char *src,
int dest_buffer_size)
{
int dest_length = strlen(dest);
int src_length = strlen(src);
if (dest_length + src_length + 1 > dest_buffer_size) {
return false;
}
memcpy(dest + dest_length, src, src_length + 1);
return true;
}
/**
* Convert a names into a SID string, appending it to a buffer.
*
* @param ctx PAM winbind context.
* @param user User in PAM request.
* @param name Name to convert.
* @param sid_list_buffer Where to append the string sid.
* @param sid_list_buffer Size of sid_list_buffer (in bytes).
*
* @return false on failure, true on success.
*/
static bool winbind_name_to_sid_string(struct pwb_context *ctx,
const char *user,
const char *name,
char *sid_list_buffer,
int sid_list_buffer_size)
{
const char* sid_string = NULL;
char *sid_str = NULL;
/* lookup name? */
if (IS_SID_STRING(name)) {
sid_string = name;
} else {
wbcErr wbc_status;
struct wbcDomainSid sid;
enum wbcSidType type;
_pam_log_debug(ctx, LOG_DEBUG,
"no sid given, looking up: %s\n", name);
wbc_status = wbcLookupName("", name, &sid, &type);
if (!WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_INFO,
"could not lookup name: %s\n", name);
return false;
}
wbc_status = wbcSidToString(&sid, &sid_str);
if (!WBC_ERROR_IS_OK(wbc_status)) {
return false;
}
sid_string = sid_str;
}
if (!safe_append_string(sid_list_buffer, sid_string,
sid_list_buffer_size)) {
wbcFreeMemory(sid_str);
return false;
}
wbcFreeMemory(sid_str);
return true;
}
/**
* Convert a list of names into a list of sids.
*
* @param ctx PAM winbind context.
* @param user User in PAM request.
* @param name_list List of names or string sids, separated by commas.
* @param sid_list_buffer Where to put the list of string sids.
* @param sid_list_buffer Size of sid_list_buffer (in bytes).
*
* @return false on failure, true on success.
*/
static bool winbind_name_list_to_sid_string_list(struct pwb_context *ctx,
const char *user,
const char *name_list,
char *sid_list_buffer,
int sid_list_buffer_size)
{
bool result = false;
char *current_name = NULL;
const char *search_location;
const char *comma;
if (sid_list_buffer_size > 0) {
sid_list_buffer[0] = 0;
}
search_location = name_list;
while ((comma = strstr(search_location, ",")) != NULL) {
current_name = strndup(search_location,
comma - search_location);
if (NULL == current_name) {
goto out;
}
if (!winbind_name_to_sid_string(ctx, user,
current_name,
sid_list_buffer,
sid_list_buffer_size)) {
/*
* If one group name failed, we must not fail
* the authentication totally, continue with
* the following group names. If user belongs to
* one of the valid groups, we must allow it
* login. -- BoYang
*/
_pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
"check if group %s is valid group.", current_name,
current_name);
_make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
"to sid, please contact your administrator to see "
"if group %s is valid."), current_name, current_name);
SAFE_FREE(current_name);
search_location = comma + 1;
continue;
}
SAFE_FREE(current_name);
if (!safe_append_string(sid_list_buffer, ",",
sid_list_buffer_size)) {
goto out;
}
search_location = comma + 1;
}
if (!winbind_name_to_sid_string(ctx, user, search_location,
sid_list_buffer,
sid_list_buffer_size)) {
_pam_log(ctx, LOG_INFO, "cannot convert group %s to sid, "
"check if group %s is valid group.", search_location,
search_location);
_make_remark_format(ctx, PAM_TEXT_INFO, _("Cannot convert group %s "
"to sid, please contact your administrator to see "
"if group %s is valid."), search_location, search_location);
}
result = true;
out:
SAFE_FREE(current_name);
return result;
}
/**
* put krb5ccname variable into environment
*
* @param ctx PAM winbind context.
* @param krb5ccname env variable retrieved from winbindd.
*
* @return void.
*/
static void _pam_setup_krb5_env(struct pwb_context *ctx,
struct wbcLogonUserInfo *info)
{
char var[PATH_MAX];
int ret;
uint32_t i;
const char *krb5ccname = NULL;
if (off(ctx->ctrl, WINBIND_KRB5_AUTH)) {
return;
}
if (!info) {
return;
}
for (i=0; i < info->num_blobs; i++) {
if (strcasecmp(info->blobs[i].name, "krb5ccname") == 0) {
krb5ccname = (const char *)info->blobs[i].blob.data;
break;
}
}
if (!krb5ccname || (strlen(krb5ccname) == 0)) {
return;
}
_pam_log_debug(ctx, LOG_DEBUG,
"request returned KRB5CCNAME: %s", krb5ccname);
if (snprintf(var, sizeof(var), "KRB5CCNAME=%s", krb5ccname) == -1) {
return;
}
ret = pam_putenv(ctx->pamh, var);
if (ret) {
_pam_log(ctx, LOG_ERR,
"failed to set KRB5CCNAME to %s: %s",
var, pam_strerror(ctx->pamh, ret));
}
}
/**
* Copy unix username if available (further processed in PAM).
*
* @param ctx PAM winbind context
* @param user_ret A pointer that holds a pointer to a string
* @param unix_username A username
*
* @return void.
*/
static void _pam_setup_unix_username(struct pwb_context *ctx,
char **user_ret,
struct wbcLogonUserInfo *info)
{
const char *unix_username = NULL;
uint32_t i;
if (!user_ret || !info) {
return;
}
for (i=0; i < info->num_blobs; i++) {
if (strcasecmp(info->blobs[i].name, "unix_username") == 0) {
unix_username = (const char *)info->blobs[i].blob.data;
break;
}
}
if (!unix_username || !unix_username[0]) {
return;
}
*user_ret = strdup(unix_username);
}
/**
* Set string into the PAM stack.
*
* @param ctx PAM winbind context.
* @param data_name Key name for pam_set_data.
* @param value String value.
*
* @return void.
*/
static void _pam_set_data_string(struct pwb_context *ctx,
const char *data_name,
const char *value)
{
int ret;
if (!data_name || !value || (strlen(data_name) == 0) ||
(strlen(value) == 0)) {
return;
}
ret = pam_set_data(ctx->pamh, data_name, talloc_strdup(NULL, value),
_pam_winbind_cleanup_func);
if (ret) {
_pam_log_debug(ctx, LOG_DEBUG,
"Could not set data %s: %s\n",
data_name, pam_strerror(ctx->pamh, ret));
}
}
/**
* Set info3 strings into the PAM stack.
*
* @param ctx PAM winbind context.
* @param data_name Key name for pam_set_data.
* @param value String value.
*
* @return void.
*/
static void _pam_set_data_info3(struct pwb_context *ctx,
const struct wbcAuthUserInfo *info)
{
_pam_set_data_string(ctx, PAM_WINBIND_HOMEDIR,
info->home_directory);
_pam_set_data_string(ctx, PAM_WINBIND_LOGONSCRIPT,
info->logon_script);
_pam_set_data_string(ctx, PAM_WINBIND_LOGONSERVER,
info->logon_server);
_pam_set_data_string(ctx, PAM_WINBIND_PROFILEPATH,
info->profile_path);
}
/**
* Free info3 strings in the PAM stack.
*
* @param pamh PAM handle
*
* @return void.
*/
static void _pam_free_data_info3(pam_handle_t *pamh)
{
pam_set_data(pamh, PAM_WINBIND_HOMEDIR, NULL, NULL);
pam_set_data(pamh, PAM_WINBIND_LOGONSCRIPT, NULL, NULL);
pam_set_data(pamh, PAM_WINBIND_LOGONSERVER, NULL, NULL);
pam_set_data(pamh, PAM_WINBIND_PROFILEPATH, NULL, NULL);
}
/**
* Send PAM_ERROR_MSG for cached or grace logons.
*
* @param ctx PAM winbind context.
* @param username User in PAM request.
* @param info3_user_flgs Info3 flags containing logon type bits.
*
* @return void.
*/
static void _pam_warn_logon_type(struct pwb_context *ctx,
const char *username,
uint32_t info3_user_flgs)
{
/* inform about logon type */
if (PAM_WB_GRACE_LOGON(info3_user_flgs)) {
_make_remark(ctx, PAM_ERROR_MSG,
_("Grace login. "
"Please change your password as soon you're "
"online again"));
_pam_log_debug(ctx, LOG_DEBUG,
"User %s logged on using grace logon\n",
username);
} else if (PAM_WB_CACHED_LOGON(info3_user_flgs)) {
_make_remark(ctx, PAM_ERROR_MSG,
_("Domain Controller unreachable, "
"using cached credentials instead. "
"Network resources may be unavailable"));
_pam_log_debug(ctx, LOG_DEBUG,
"User %s logged on using cached credentials\n",
username);
}
}
/**
* Send PAM_ERROR_MSG for krb5 errors.
*
* @param ctx PAM winbind context.
* @param username User in PAM request.
* @param info3_user_flgs Info3 flags containing logon type bits.
*
* @return void.
*/
static void _pam_warn_krb5_failure(struct pwb_context *ctx,
const char *username,
uint32_t info3_user_flgs)
{
if (PAM_WB_KRB5_CLOCK_SKEW(info3_user_flgs)) {
_make_remark(ctx, PAM_ERROR_MSG,
_("Failed to establish your Kerberos Ticket cache "
"due time differences\n"
"with the domain controller. "
"Please verify the system time.\n"));
_pam_log_debug(ctx, LOG_DEBUG,
"User %s: Clock skew when getting Krb5 TGT\n",
username);
}
}
static bool _pam_check_remark_auth_err(struct pwb_context *ctx,
const struct wbcAuthErrorInfo *e,
const char *nt_status_string,
int *pam_error)
{
const char *ntstatus = NULL;
const char *error_string = NULL;
if (!e || !pam_error) {
return false;
}
ntstatus = e->nt_string;
if (!ntstatus) {
return false;
}
if (strcasecmp(ntstatus, nt_status_string) == 0) {
error_string = _get_ntstatus_error_string(nt_status_string);
if (error_string) {
_make_remark(ctx, PAM_ERROR_MSG, error_string);
*pam_error = e->pam_error;
return true;
}
if (e->display_string) {
_make_remark(ctx, PAM_ERROR_MSG, e->display_string);
*pam_error = e->pam_error;
return true;
}
_make_remark(ctx, PAM_ERROR_MSG, nt_status_string);
*pam_error = e->pam_error;
return true;
}
return false;
};
/**
* Compose Password Restriction String for a PAM_ERROR_MSG conversation.
*
* @param i The wbcUserPasswordPolicyInfo struct.
*
* @return string (caller needs to talloc_free).
*/
static char *_pam_compose_pwd_restriction_string(struct pwb_context *ctx,
struct wbcUserPasswordPolicyInfo *i)
{
char *str = NULL;
if (!i) {
goto failed;
}
str = talloc_asprintf(ctx, _("Your password "));
if (!str) {
goto failed;
}
if (i->min_length_password > 0) {
str = talloc_asprintf_append(str,
_("must be at least %d characters; "),
i->min_length_password);
if (!str) {
goto failed;
}
}
if (i->password_history > 0) {
str = talloc_asprintf_append(str,
_("cannot repeat any of your previous %d "
"passwords; "),
i->password_history);
if (!str) {
goto failed;
}
}
if (i->password_properties & WBC_DOMAIN_PASSWORD_COMPLEX) {
str = talloc_asprintf_append(str,
_("must contain capitals, numerals "
"or punctuation; "
"and cannot contain your account "
"or full name; "));
if (!str) {
goto failed;
}
}
str = talloc_asprintf_append(str,
_("Please type a different password. "
"Type a password which meets these requirements in "
"both text boxes."));
if (!str) {
goto failed;
}
return str;
failed:
TALLOC_FREE(str);
return NULL;
}
static int _pam_create_homedir(struct pwb_context *ctx,
const char *dirname,
mode_t mode)
{
struct stat sbuf;
if (stat(dirname, &sbuf) == 0) {
return PAM_SUCCESS;
}
if (mkdir(dirname, mode) != 0) {
_make_remark_format(ctx, PAM_TEXT_INFO,
_("Creating directory: %s failed: %s"),
dirname, strerror(errno));
_pam_log(ctx, LOG_ERR, "could not create dir: %s (%s)",
dirname, strerror(errno));
return PAM_PERM_DENIED;
}
return PAM_SUCCESS;
}
static int _pam_chown_homedir(struct pwb_context *ctx,
const char *dirname,
uid_t uid,
gid_t gid)
{
if (chown(dirname, uid, gid) != 0) {
_pam_log(ctx, LOG_ERR, "failed to chown user homedir: %s (%s)",
dirname, strerror(errno));
return PAM_PERM_DENIED;
}
return PAM_SUCCESS;
}
static int _pam_mkhomedir(struct pwb_context *ctx)
{
struct passwd *pwd = NULL;
char *token = NULL;
char *create_dir = NULL;
char *user_dir = NULL;
int ret;
const char *username;
mode_t mode = 0700;
char *safe_ptr = NULL;
char *p = NULL;
/* Get the username */
ret = pam_get_user(ctx->pamh, &username, NULL);
if ((ret != PAM_SUCCESS) || (!username)) {
_pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
return PAM_SERVICE_ERR;
}
pwd = getpwnam(username);
if (pwd == NULL) {
_pam_log_debug(ctx, LOG_DEBUG, "can not get the username");
return PAM_USER_UNKNOWN;
}
_pam_log_debug(ctx, LOG_DEBUG, "homedir is: %s", pwd->pw_dir);
ret = _pam_create_homedir(ctx, pwd->pw_dir, 0700);
if (ret == PAM_SUCCESS) {
ret = _pam_chown_homedir(ctx, pwd->pw_dir,
pwd->pw_uid,
pwd->pw_gid);
}
if (ret == PAM_SUCCESS) {
return ret;
}
/* maybe we need to create parent dirs */
create_dir = talloc_strdup(ctx, "/");
if (!create_dir) {
return PAM_BUF_ERR;
}
/* find final directory */
user_dir = strrchr(pwd->pw_dir, '/');
if (!user_dir) {
return PAM_BUF_ERR;
}
user_dir++;
_pam_log(ctx, LOG_DEBUG, "final directory: %s", user_dir);
p = pwd->pw_dir;
while ((token = strtok_r(p, "/", &safe_ptr)) != NULL) {
mode = 0755;
p = NULL;
_pam_log_debug(ctx, LOG_DEBUG, "token is %s", token);
create_dir = talloc_asprintf_append(create_dir, "%s/", token);
if (!create_dir) {
return PAM_BUF_ERR;
}
_pam_log_debug(ctx, LOG_DEBUG, "current_dir is %s", create_dir);
if (strcmp(token, user_dir) == 0) {
_pam_log_debug(ctx, LOG_DEBUG, "assuming last directory: %s", token);
mode = 0700;
}
ret = _pam_create_homedir(ctx, create_dir, mode);
if (ret) {
return ret;
}
}
return _pam_chown_homedir(ctx, create_dir,
pwd->pw_uid,
pwd->pw_gid);
}
/* talk to winbindd */
static int winbind_auth_request(struct pwb_context *ctx,
const char *user,
const char *pass,
const char *member,
const char *cctype,
const int warn_pwd_expire,
struct wbcAuthErrorInfo **p_error,
struct wbcLogonUserInfo **p_info,
struct wbcUserPasswordPolicyInfo **p_policy,
time_t *pwd_last_set,
char **user_ret)
{
wbcErr wbc_status;
struct wbcLogonUserParams logon;
char membership_of[1024];
uid_t user_uid = -1;
uint32_t flags = WBFLAG_PAM_INFO3_TEXT |
WBFLAG_PAM_GET_PWD_POLICY;
struct wbcLogonUserInfo *info = NULL;
struct wbcAuthUserInfo *user_info = NULL;
struct wbcAuthErrorInfo *error = NULL;
struct wbcUserPasswordPolicyInfo *policy = NULL;
int ret = PAM_AUTH_ERR;
int i;
const char *codes[] = {
"NT_STATUS_PASSWORD_EXPIRED",
"NT_STATUS_PASSWORD_MUST_CHANGE",
"NT_STATUS_INVALID_WORKSTATION",
"NT_STATUS_INVALID_LOGON_HOURS",
"NT_STATUS_ACCOUNT_EXPIRED",
"NT_STATUS_ACCOUNT_DISABLED",
"NT_STATUS_ACCOUNT_LOCKED_OUT",
"NT_STATUS_NOLOGON_WORKSTATION_TRUST_ACCOUNT",
"NT_STATUS_NOLOGON_SERVER_TRUST_ACCOUNT",
"NT_STATUS_NOLOGON_INTERDOMAIN_TRUST_ACCOUNT",
"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
"NT_STATUS_NO_LOGON_SERVERS",
"NT_STATUS_WRONG_PASSWORD",
"NT_STATUS_ACCESS_DENIED"
};
if (pwd_last_set) {
*pwd_last_set = 0;
}
/* Krb5 auth always has to go against the KDC of the user's realm */
if (ctx->ctrl & WINBIND_KRB5_AUTH) {
flags |= WBFLAG_PAM_CONTACT_TRUSTDOM;
}
if (ctx->ctrl & (WINBIND_KRB5_AUTH|WINBIND_CACHED_LOGIN)) {
struct passwd *pwd = NULL;
pwd = getpwnam(user);
if (pwd == NULL) {
return PAM_USER_UNKNOWN;
}
user_uid = pwd->pw_uid;
}
if (ctx->ctrl & WINBIND_KRB5_AUTH) {
_pam_log_debug(ctx, LOG_DEBUG,
"enabling krb5 login flag\n");
flags |= WBFLAG_PAM_KRB5 |
WBFLAG_PAM_FALLBACK_AFTER_KRB5;
}
if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
_pam_log_debug(ctx, LOG_DEBUG,
"enabling cached login flag\n");
flags |= WBFLAG_PAM_CACHED_LOGIN;
}
if (user_ret) {
*user_ret = NULL;
flags |= WBFLAG_PAM_UNIX_NAME;
}
if (cctype != NULL) {
_pam_log_debug(ctx, LOG_DEBUG,
"enabling request for a %s krb5 ccache\n",
cctype);
}
if (member != NULL) {
ZERO_STRUCT(membership_of);
if (!winbind_name_list_to_sid_string_list(ctx, user, member,
membership_of,
sizeof(membership_of))) {
_pam_log_debug(ctx, LOG_ERR,
"failed to serialize membership of sid "
"\"%s\"\n", member);
return PAM_AUTH_ERR;
}
}
ZERO_STRUCT(logon);
logon.username = user;
logon.password = pass;
if (cctype) {
wbc_status = wbcAddNamedBlob(&logon.num_blobs,
&logon.blobs,
"krb5_cc_type",
0,
(uint8_t *)cctype,
strlen(cctype)+1);
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto done;
}
}
wbc_status = wbcAddNamedBlob(&logon.num_blobs,
&logon.blobs,
"flags",
0,
(uint8_t *)&flags,
sizeof(flags));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto done;
}
wbc_status = wbcAddNamedBlob(&logon.num_blobs,
&logon.blobs,
"user_uid",
0,
(uint8_t *)&user_uid,
sizeof(user_uid));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto done;
}
if (member) {
wbc_status = wbcAddNamedBlob(&logon.num_blobs,
&logon.blobs,
"membership_of",
0,
(uint8_t *)membership_of,
sizeof(membership_of));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto done;
}
}
wbc_status = wbcLogonUser(&logon, &info, &error, &policy);
ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
user, "wbcLogonUser");
wbcFreeMemory(logon.blobs);
logon.blobs = NULL;
if (info && info->info) {
user_info = info->info;
}
if (pwd_last_set && user_info) {
*pwd_last_set = user_info->pass_last_set_time;
}
if (p_info && info) {
*p_info = info;
}
if (p_policy && policy) {
*p_policy = policy;
}
if (p_error && error) {
/* We want to process the error in the caller. */
*p_error = error;
return ret;
}
for (i=0; i<ARRAY_SIZE(codes); i++) {
int _ret = ret;
if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
ret = _ret;
goto done;
}
}
if ((ret == PAM_SUCCESS) && user_info && policy && info) {
bool already_expired = false;
/* warn a user if the password is about to expire soon */
_pam_warn_password_expiry(ctx, user_info, policy,
warn_pwd_expire,
&already_expired);
if (already_expired == true) {
SMB_TIME_T last_set = user_info->pass_last_set_time;
_pam_log_debug(ctx, LOG_DEBUG,
"Password has expired "
"(Password was last set: %lld, "
"the policy says it should expire here "
"%lld (now it's: %ld))\n",
(long long int)last_set,
(long long int)last_set +
policy->expire,
(long)time(NULL));
return PAM_AUTHTOK_EXPIRED;
}
/* inform about logon type */
_pam_warn_logon_type(ctx, user, user_info->user_flags);
/* inform about krb5 failures */
_pam_warn_krb5_failure(ctx, user, user_info->user_flags);
/* set some info3 info for other modules in the stack */
_pam_set_data_info3(ctx, user_info);
/* put krb5ccname into env */
_pam_setup_krb5_env(ctx, info);
/* If winbindd returned a username, return the pointer to it
* here. */
_pam_setup_unix_username(ctx, user_ret, info);
}
done:
if (logon.blobs) {
wbcFreeMemory(logon.blobs);
}
if (info && info->blobs && !p_info) {
wbcFreeMemory(info->blobs);
}
if (error && !p_error) {
wbcFreeMemory(error);
}
if (info && !p_info) {
wbcFreeMemory(info);
}
if (policy && !p_policy) {
wbcFreeMemory(policy);
}
return ret;
}
/* talk to winbindd */
static int winbind_chauthtok_request(struct pwb_context *ctx,
const char *user,
const char *oldpass,
const char *newpass,
time_t pwd_last_set)
{
wbcErr wbc_status;
struct wbcChangePasswordParams params;
struct wbcAuthErrorInfo *error = NULL;
struct wbcUserPasswordPolicyInfo *policy = NULL;
enum wbcPasswordChangeRejectReason reject_reason = -1;
uint32_t flags = 0;
int i;
const char *codes[] = {
"NT_STATUS_BACKUP_CONTROLLER",
"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
"NT_STATUS_NO_LOGON_SERVERS",
"NT_STATUS_ACCESS_DENIED",
"NT_STATUS_PWD_TOO_SHORT", /* TODO: tell the min pwd length ? */
"NT_STATUS_PWD_TOO_RECENT", /* TODO: tell the minage ? */
"NT_STATUS_PWD_HISTORY_CONFLICT" /* TODO: tell the history length ? */
};
int ret = PAM_AUTH_ERR;
ZERO_STRUCT(params);
if (ctx->ctrl & WINBIND_KRB5_AUTH) {
flags |= WBFLAG_PAM_KRB5 |
WBFLAG_PAM_CONTACT_TRUSTDOM;
}
if (ctx->ctrl & WINBIND_CACHED_LOGIN) {
flags |= WBFLAG_PAM_CACHED_LOGIN;
}
params.account_name = user;
params.level = WBC_AUTH_USER_LEVEL_PLAIN;
params.old_password.plaintext = oldpass;
params.new_password.plaintext = newpass;
params.flags = flags;
wbc_status = wbcChangeUserPasswordEx(&params, &error, &reject_reason, &policy);
ret = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
user, "wbcChangeUserPasswordEx");
if (WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_NOTICE,
"user '%s' password changed", user);
return PAM_SUCCESS;
}
if (!error) {
wbcFreeMemory(policy);
return ret;
}
for (i=0; i<ARRAY_SIZE(codes); i++) {
int _ret = ret;
if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
ret = _ret;
goto done;
}
}
if (!strcasecmp(error->nt_string,
"NT_STATUS_PASSWORD_RESTRICTION")) {
char *pwd_restriction_string = NULL;
SMB_TIME_T min_pwd_age = 0;
if (policy) {
min_pwd_age = policy->min_passwordage;
}
/* FIXME: avoid to send multiple PAM messages after another */
switch (reject_reason) {
case -1:
break;
case WBC_PWD_CHANGE_NO_ERROR:
if ((min_pwd_age > 0) &&
(pwd_last_set + min_pwd_age > time(NULL))) {
PAM_WB_REMARK_DIRECT(ctx,
"NT_STATUS_PWD_TOO_RECENT");
}
break;
case WBC_PWD_CHANGE_PASSWORD_TOO_SHORT:
PAM_WB_REMARK_DIRECT(ctx,
"NT_STATUS_PWD_TOO_SHORT");
break;
case WBC_PWD_CHANGE_PWD_IN_HISTORY:
PAM_WB_REMARK_DIRECT(ctx,
"NT_STATUS_PWD_HISTORY_CONFLICT");
break;
case WBC_PWD_CHANGE_NOT_COMPLEX:
_make_remark(ctx, PAM_ERROR_MSG,
_("Password does not meet "
"complexity requirements"));
break;
default:
_pam_log_debug(ctx, LOG_DEBUG,
"unknown password change "
"reject reason: %d",
reject_reason);
break;
}
pwd_restriction_string =
_pam_compose_pwd_restriction_string(ctx, policy);
if (pwd_restriction_string) {
_make_remark(ctx, PAM_ERROR_MSG,
pwd_restriction_string);
TALLOC_FREE(pwd_restriction_string);
}
}
done:
wbcFreeMemory(error);
wbcFreeMemory(policy);
return ret;
}
/*
* Checks if a user has an account
*
* return values:
* 1 = User not found
* 0 = OK
* -1 = System error
*/
static int valid_user(struct pwb_context *ctx,
const char *user)
{
/* check not only if the user is available over NSS calls, also make
* sure it's really a winbind user, this is important when stacking PAM
* modules in the 'account' or 'password' facility. */
wbcErr wbc_status;
struct passwd *pwd = NULL;
struct passwd *wb_pwd = NULL;
pwd = getpwnam(user);
if (pwd == NULL) {
return 1;
}
wbc_status = wbcGetpwnam(user, &wb_pwd);
wbcFreeMemory(wb_pwd);
if (!WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_DEBUG, "valid_user: wbcGetpwnam gave %s\n",
wbcErrorString(wbc_status));
}
switch (wbc_status) {
case WBC_ERR_UNKNOWN_USER:
return 1;
case WBC_ERR_SUCCESS:
return 0;
default:
break;
}
return -1;
}
static char *_pam_delete(register char *xx)
{
_pam_overwrite(xx);
_pam_drop(xx);
return NULL;
}
/*
* obtain a password from the user
*/
static int _winbind_read_password(struct pwb_context *ctx,
unsigned int ctrl,
const char *comment,
const char *prompt1,
const char *prompt2,
const char **pass)
{
int authtok_flag;
int retval;
const char *item;
char *token;
_pam_log(ctx, LOG_DEBUG, "getting password (0x%08x)", ctrl);
/*
* make sure nothing inappropriate gets returned
*/
*pass = token = NULL;
/*
* which authentication token are we getting?
*/
if (on(WINBIND__OLD_PASSWORD, ctrl)) {
authtok_flag = PAM_OLDAUTHTOK;
} else {
authtok_flag = PAM_AUTHTOK;
}
/*
* should we obtain the password from a PAM item ?
*/
if (on(WINBIND_TRY_FIRST_PASS_ARG, ctrl) ||
on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
retval = _pam_get_item(ctx->pamh, authtok_flag, &item);
if (retval != PAM_SUCCESS) {
/* very strange. */
_pam_log(ctx, LOG_ALERT,
"pam_get_item returned error "
"to unix-read-password");
return retval;
} else if (item != NULL) { /* we have a password! */
*pass = item;
item = NULL;
_pam_log(ctx, LOG_DEBUG,
"pam_get_item returned a password");
return PAM_SUCCESS;
} else if (on(WINBIND_USE_FIRST_PASS_ARG, ctrl)) {
return PAM_AUTHTOK_RECOVER_ERR; /* didn't work */
} else if (on(WINBIND_USE_AUTHTOK_ARG, ctrl)
&& off(WINBIND__OLD_PASSWORD, ctrl)) {
return PAM_AUTHTOK_RECOVER_ERR;
}
}
/*
* getting here implies we will have to get the password from the
* user directly.
*/
{
struct pam_message msg[3], *pmsg[3];
struct pam_response *resp;
int i, replies;
/* prepare to converse */
if (comment != NULL && off(ctrl, WINBIND_SILENT)) {
pmsg[0] = &msg[0];
msg[0].msg_style = PAM_TEXT_INFO;
msg[0].msg = discard_const_p(char, comment);
i = 1;
} else {
i = 0;
}
pmsg[i] = &msg[i];
msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
msg[i++].msg = discard_const_p(char, prompt1);
replies = 1;
if (prompt2 != NULL) {
pmsg[i] = &msg[i];
msg[i].msg_style = PAM_PROMPT_ECHO_OFF;
msg[i++].msg = discard_const_p(char, prompt2);
++replies;
}
/* so call the conversation expecting i responses */
resp = NULL;
retval = converse(ctx->pamh, i, pmsg, &resp);
if (resp == NULL) {
if (retval == PAM_SUCCESS) {
retval = PAM_AUTHTOK_RECOVER_ERR;
}
goto done;
}
if (retval != PAM_SUCCESS) {
_pam_drop_reply(resp, i);
goto done;
}
/* interpret the response */
token = x_strdup(resp[i - replies].resp);
if (!token) {
_pam_log(ctx, LOG_NOTICE,
"could not recover "
"authentication token");
retval = PAM_AUTHTOK_RECOVER_ERR;
goto done;
}
if (replies == 2) {
/* verify that password entered correctly */
if (!resp[i - 1].resp ||
strcmp(token, resp[i - 1].resp)) {
_pam_delete(token); /* mistyped */
retval = PAM_AUTHTOK_RECOVER_ERR;
_make_remark(ctx, PAM_ERROR_MSG,
MISTYPED_PASS);
}
}
/*
* tidy up the conversation (resp_retcode) is ignored
* -- what is it for anyway? AGM
*/
_pam_drop_reply(resp, i);
}
done:
if (retval != PAM_SUCCESS) {
_pam_log_debug(ctx, LOG_DEBUG,
"unable to obtain a password");
return retval;
}
/* 'token' is the entered password */
/* we store this password as an item */
retval = pam_set_item(ctx->pamh, authtok_flag, token);
_pam_delete(token); /* clean it up */
if (retval != PAM_SUCCESS ||
(retval = _pam_get_item(ctx->pamh, authtok_flag, &item)) != PAM_SUCCESS) {
_pam_log(ctx, LOG_CRIT, "error manipulating password");
return retval;
}
*pass = item;
item = NULL; /* break link to password */
return PAM_SUCCESS;
}
static const char *get_conf_item_string(struct pwb_context *ctx,
const char *item,
int config_flag)
{
int i = 0;
const char *parm_opt = NULL;
if (!(ctx->ctrl & config_flag)) {
goto out;
}
/* let the pam opt take precedence over the pam_winbind.conf option */
for (i=0; i<ctx->argc; i++) {
if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
char *p;
if ((p = strchr(ctx->argv[i], '=')) == NULL) {
_pam_log(ctx, LOG_INFO,
"no \"=\" delimiter for \"%s\" found\n",
item);
goto out;
}
_pam_log_debug(ctx, LOG_INFO,
"PAM config: %s '%s'\n", item, p+1);
return p + 1;
}
}
if (ctx->dict) {
char *key = NULL;
key = talloc_asprintf(ctx, "global:%s", item);
if (!key) {
goto out;
}
parm_opt = iniparser_getstr(ctx->dict, key);
TALLOC_FREE(key);
_pam_log_debug(ctx, LOG_INFO, "CONFIG file: %s '%s'\n",
item, parm_opt);
}
out:
return parm_opt;
}
static int get_config_item_int(struct pwb_context *ctx,
const char *item,
int config_flag)
{
int i, parm_opt = -1;
if (!(ctx->ctrl & config_flag)) {
goto out;
}
/* let the pam opt take precedence over the pam_winbind.conf option */
for (i = 0; i < ctx->argc; i++) {
if ((strncmp(ctx->argv[i], item, strlen(item)) == 0)) {
char *p;
if ((p = strchr(ctx->argv[i], '=')) == NULL) {
_pam_log(ctx, LOG_INFO,
"no \"=\" delimiter for \"%s\" found\n",
item);
goto out;
}
parm_opt = atoi(p + 1);
_pam_log_debug(ctx, LOG_INFO,
"PAM config: %s '%d'\n",
item, parm_opt);
return parm_opt;
}
}
if (ctx->dict) {
char *key = NULL;
key = talloc_asprintf(ctx, "global:%s", item);
if (!key) {
goto out;
}
parm_opt = iniparser_getint(ctx->dict, key, -1);
TALLOC_FREE(key);
_pam_log_debug(ctx, LOG_INFO,
"CONFIG file: %s '%d'\n",
item, parm_opt);
}
out:
return parm_opt;
}
static const char *get_krb5_cc_type_from_config(struct pwb_context *ctx)
{
return get_conf_item_string(ctx, "krb5_ccache_type",
WINBIND_KRB5_CCACHE_TYPE);
}
static const char *get_member_from_config(struct pwb_context *ctx)
{
const char *ret = NULL;
ret = get_conf_item_string(ctx, "require_membership_of",
WINBIND_REQUIRED_MEMBERSHIP);
if (ret) {
return ret;
}
return get_conf_item_string(ctx, "require-membership-of",
WINBIND_REQUIRED_MEMBERSHIP);
}
static int get_warn_pwd_expire_from_config(struct pwb_context *ctx)
{
int ret;
ret = get_config_item_int(ctx, "warn_pwd_expire",
WINBIND_WARN_PWD_EXPIRE);
/* no or broken setting */
if (ret <= 0) {
return DEFAULT_DAYS_TO_WARN_BEFORE_PWD_EXPIRES;
}
return ret;
}
/**
* Retrieve the winbind separator.
*
* @param ctx PAM winbind context.
*
* @return string separator character. NULL on failure.
*/
static char winbind_get_separator(struct pwb_context *ctx)
{
wbcErr wbc_status;
static struct wbcInterfaceDetails *details = NULL;
wbc_status = wbcInterfaceDetails(&details);
if (!WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_ERR,
"Could not retrieve winbind interface details: %s",
wbcErrorString(wbc_status));
return '\0';
}
if (!details) {
return '\0';
}
return details->winbind_separator;
}
/**
* Convert a upn to a name.
*
* @param ctx PAM winbind context.
* @param upn USer UPN to be trabslated.
*
* @return converted name. NULL pointer on failure. Caller needs to free.
*/
static char* winbind_upn_to_username(struct pwb_context *ctx,
const char *upn)
{
char sep;
wbcErr wbc_status = WBC_ERR_UNKNOWN_FAILURE;
struct wbcDomainSid sid;
enum wbcSidType type;
char *domain;
char *name;
char *p;
/* This cannot work when the winbind separator = @ */
sep = winbind_get_separator(ctx);
if (!sep || sep == '@') {
return NULL;
}
name = talloc_strdup(ctx, upn);
if (!name) {
return NULL;
}
if ((p = strchr(name, '@')) != NULL) {
*p = 0;
domain = p + 1;
}
/* Convert the UPN to a SID */
wbc_status = wbcLookupName(domain, name, &sid, &type);
if (!WBC_ERROR_IS_OK(wbc_status)) {
return NULL;
}
/* Convert the the SID back to the sAMAccountName */
wbc_status = wbcLookupSid(&sid, &domain, &name, &type);
if (!WBC_ERROR_IS_OK(wbc_status)) {
return NULL;
}
return talloc_asprintf(ctx, "%s\\%s", domain, name);
}
static int _pam_delete_cred(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int retval = PAM_SUCCESS;
struct pwb_context *ctx = NULL;
struct wbcLogoffUserParams logoff;
struct wbcAuthErrorInfo *error = NULL;
const char *user;
wbcErr wbc_status = WBC_ERR_SUCCESS;
ZERO_STRUCT(logoff);
retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
if (retval) {
goto out;
}
_PAM_LOG_FUNCTION_ENTER("_pam_delete_cred", ctx);
if (ctx->ctrl & WINBIND_KRB5_AUTH) {
/* destroy the ccache here */
uint32_t wbc_flags = 0;
const char *ccname = NULL;
struct passwd *pwd = NULL;
retval = pam_get_user(pamh, &user, _("Username: "));
if (retval) {
_pam_log(ctx, LOG_ERR,
"could not identify user");
goto out;
}
if (user == NULL) {
_pam_log(ctx, LOG_ERR,
"username was NULL!");
retval = PAM_USER_UNKNOWN;
goto out;
}
_pam_log_debug(ctx, LOG_DEBUG,
"username [%s] obtained", user);
ccname = pam_getenv(pamh, "KRB5CCNAME");
if (ccname == NULL) {
_pam_log_debug(ctx, LOG_DEBUG,
"user has no KRB5CCNAME environment");
}
pwd = getpwnam(user);
if (pwd == NULL) {
retval = PAM_USER_UNKNOWN;
goto out;
}
wbc_flags = WBFLAG_PAM_KRB5 |
WBFLAG_PAM_CONTACT_TRUSTDOM;
logoff.username = user;
if (ccname) {
wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
&logoff.blobs,
"ccfilename",
0,
(uint8_t *)ccname,
strlen(ccname)+1);
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto out;
}
}
wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
&logoff.blobs,
"flags",
0,
(uint8_t *)&wbc_flags,
sizeof(wbc_flags));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto out;
}
wbc_status = wbcAddNamedBlob(&logoff.num_blobs,
&logoff.blobs,
"user_uid",
0,
(uint8_t *)&pwd->pw_uid,
sizeof(pwd->pw_uid));
if (!WBC_ERROR_IS_OK(wbc_status)) {
goto out;
}
wbc_status = wbcLogoffUserEx(&logoff, &error);
retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
user, "wbcLogoffUser");
wbcFreeMemory(error);
wbcFreeMemory(logoff.blobs);
logoff.blobs = NULL;
if (!WBC_ERROR_IS_OK(wbc_status)) {
_pam_log(ctx, LOG_INFO,
"failed to logoff user %s: %s\n",
user, wbcErrorString(wbc_status));
}
}
out:
if (logoff.blobs) {
wbcFreeMemory(logoff.blobs);
}
if (!WBC_ERROR_IS_OK(wbc_status)) {
retval = wbc_auth_error_to_pam_error(ctx, error, wbc_status,
user, "wbcLogoffUser");
}
/*
* Delete the krb5 ccname variable from the PAM environment
* if it was set by winbind.
*/
if ((ctx->ctrl & WINBIND_KRB5_AUTH) && pam_getenv(pamh, "KRB5CCNAME")) {
pam_putenv(pamh, "KRB5CCNAME");
}
_PAM_LOG_FUNCTION_LEAVE("_pam_delete_cred", ctx, retval);
TALLOC_FREE(ctx);
return retval;
}
PAM_EXTERN
int pam_sm_authenticate(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
const char *username;
const char *password;
const char *member = NULL;
const char *cctype = NULL;
int warn_pwd_expire;
int retval = PAM_AUTH_ERR;
char *username_ret = NULL;
char *new_authtok_required = NULL;
char *real_username = NULL;
struct pwb_context *ctx = NULL;
retval = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
if (retval) {
goto out;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_authenticate", ctx);
/* Get the username */
retval = pam_get_user(pamh, &username, NULL);
if ((retval != PAM_SUCCESS) || (!username)) {
_pam_log_debug(ctx, LOG_DEBUG,
"can not get the username");
retval = PAM_SERVICE_ERR;
goto out;
}
#if defined(AIX)
/* Decode the user name since AIX does not support logn user
names by default. The name is encoded as _#uid. */
if (username[0] == '_') {
uid_t id = atoi(&username[1]);
struct passwd *pw = NULL;
if ((id!=0) && ((pw = getpwuid(id)) != NULL)) {
real_username = strdup(pw->pw_name);
}
}
#endif
if (!real_username) {
/* Just making a copy of the username we got from PAM */
if ((real_username = strdup(username)) == NULL) {
_pam_log_debug(ctx, LOG_DEBUG,
"memory allocation failure when copying "
"username");
retval = PAM_SERVICE_ERR;
goto out;
}
}
/* Maybe this was a UPN */
if (strchr(real_username, '@') != NULL) {
char *samaccountname = NULL;
samaccountname = winbind_upn_to_username(ctx,
real_username);
if (samaccountname) {
free(real_username);
real_username = strdup(samaccountname);
}
}
retval = _winbind_read_password(ctx, ctx->ctrl, NULL,
_("Password: "), NULL,
&password);
if (retval != PAM_SUCCESS) {
_pam_log(ctx, LOG_ERR,
"Could not retrieve user's password");
retval = PAM_AUTHTOK_ERR;
goto out;
}
/* Let's not give too much away in the log file */
#ifdef DEBUG_PASSWORD
_pam_log_debug(ctx, LOG_INFO,
"Verify user '%s' with password '%s'",
real_username, password);
#else
_pam_log_debug(ctx, LOG_INFO,
"Verify user '%s'", real_username);
#endif
member = get_member_from_config(ctx);
cctype = get_krb5_cc_type_from_config(ctx);
warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
/* Now use the username to look up password */
retval = winbind_auth_request(ctx, real_username, password,
member, cctype, warn_pwd_expire,
NULL, NULL, NULL,
NULL, &username_ret);
if (retval == PAM_NEW_AUTHTOK_REQD ||
retval == PAM_AUTHTOK_EXPIRED) {
char *new_authtok_required_during_auth = NULL;
new_authtok_required = talloc_asprintf(NULL, "%d", retval);
if (!new_authtok_required) {
retval = PAM_BUF_ERR;
goto out;
}
pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
new_authtok_required,
_pam_winbind_cleanup_func);
retval = PAM_SUCCESS;
new_authtok_required_during_auth = talloc_asprintf(NULL, "%d", true);
if (!new_authtok_required_during_auth) {
retval = PAM_BUF_ERR;
goto out;
}
pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
new_authtok_required_during_auth,
_pam_winbind_cleanup_func);
goto out;
}
out:
if (username_ret) {
pam_set_item (pamh, PAM_USER, username_ret);
_pam_log_debug(ctx, LOG_INFO,
"Returned user was '%s'", username_ret);
free(username_ret);
}
if (real_username) {
free(real_username);
}
if (!new_authtok_required) {
pam_set_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD, NULL, NULL);
}
if (retval != PAM_SUCCESS) {
_pam_free_data_info3(pamh);
}
_PAM_LOG_FUNCTION_LEAVE("pam_sm_authenticate", ctx, retval);
TALLOC_FREE(ctx);
return retval;
}
PAM_EXTERN
int pam_sm_setcred(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int ret = PAM_SYSTEM_ERR;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
if (ret) {
goto out;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_setcred", ctx);
switch (flags & ~PAM_SILENT) {
case PAM_DELETE_CRED:
ret = _pam_delete_cred(pamh, flags, argc, argv);
break;
case PAM_REFRESH_CRED:
_pam_log_debug(ctx, LOG_WARNING,
"PAM_REFRESH_CRED not implemented");
ret = PAM_SUCCESS;
break;
case PAM_REINITIALIZE_CRED:
_pam_log_debug(ctx, LOG_WARNING,
"PAM_REINITIALIZE_CRED not implemented");
ret = PAM_SUCCESS;
break;
case PAM_ESTABLISH_CRED:
_pam_log_debug(ctx, LOG_WARNING,
"PAM_ESTABLISH_CRED not implemented");
ret = PAM_SUCCESS;
break;
default:
ret = PAM_SYSTEM_ERR;
break;
}
out:
_PAM_LOG_FUNCTION_LEAVE("pam_sm_setcred", ctx, ret);
TALLOC_FREE(ctx);
return ret;
}
/*
* Account management. We want to verify that the account exists
* before returning PAM_SUCCESS
*/
PAM_EXTERN
int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
const char *username;
int ret = PAM_USER_UNKNOWN;
void *tmp = NULL;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
if (ret) {
goto out;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_acct_mgmt", ctx);
/* Get the username */
ret = pam_get_user(pamh, &username, NULL);
if ((ret != PAM_SUCCESS) || (!username)) {
_pam_log_debug(ctx, LOG_DEBUG,
"can not get the username");
ret = PAM_SERVICE_ERR;
goto out;
}
/* Verify the username */
ret = valid_user(ctx, username);
switch (ret) {
case -1:
/* some sort of system error. The log was already printed */
ret = PAM_SERVICE_ERR;
goto out;
case 1:
/* the user does not exist */
_pam_log_debug(ctx, LOG_NOTICE, "user '%s' not found",
username);
if (ctx->ctrl & WINBIND_UNKNOWN_OK_ARG) {
ret = PAM_IGNORE;
goto out;
}
ret = PAM_USER_UNKNOWN;
goto out;
case 0:
pam_get_data(pamh, PAM_WINBIND_NEW_AUTHTOK_REQD,
(const void **)&tmp);
if (tmp != NULL) {
ret = atoi((const char *)tmp);
switch (ret) {
case PAM_AUTHTOK_EXPIRED:
/* fall through, since new token is required in this case */
case PAM_NEW_AUTHTOK_REQD:
_pam_log(ctx, LOG_WARNING,
"pam_sm_acct_mgmt success but %s is set",
PAM_WINBIND_NEW_AUTHTOK_REQD);
_pam_log(ctx, LOG_NOTICE,
"user '%s' needs new password",
username);
/* PAM_AUTHTOKEN_REQD does not exist, but is documented in the manpage */
ret = PAM_NEW_AUTHTOK_REQD;
goto out;
default:
_pam_log(ctx, LOG_WARNING,
"pam_sm_acct_mgmt success");
_pam_log(ctx, LOG_NOTICE,
"user '%s' granted access", username);
ret = PAM_SUCCESS;
goto out;
}
}
/* Otherwise, the authentication looked good */
_pam_log(ctx, LOG_NOTICE,
"user '%s' granted access", username);
ret = PAM_SUCCESS;
goto out;
default:
/* we don't know anything about this return value */
_pam_log(ctx, LOG_ERR,
"internal module error (ret = %d, user = '%s')",
ret, username);
ret = PAM_SERVICE_ERR;
goto out;
}
/* should not be reached */
ret = PAM_IGNORE;
out:
_PAM_LOG_FUNCTION_LEAVE("pam_sm_acct_mgmt", ctx, ret);
TALLOC_FREE(ctx);
return ret;
}
PAM_EXTERN
int pam_sm_open_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int ret = PAM_SUCCESS;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
if (ret) {
goto out;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_open_session", ctx);
if (ctx->ctrl & WINBIND_MKHOMEDIR) {
/* check and create homedir */
ret = _pam_mkhomedir(ctx);
}
out:
_PAM_LOG_FUNCTION_LEAVE("pam_sm_open_session", ctx, ret);
TALLOC_FREE(ctx);
return ret;
}
PAM_EXTERN
int pam_sm_close_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int ret = PAM_SUCCESS;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
if (ret) {
goto out;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_close_session", ctx);
out:
_PAM_LOG_FUNCTION_LEAVE("pam_sm_close_session", ctx, ret);
TALLOC_FREE(ctx);
return ret;
}
/**
* evaluate whether we need to re-authenticate with kerberos after a
* password change
*
* @param ctx PAM winbind context.
* @param user The username
*
* @return boolean Returns true if required, false if not.
*/
static bool _pam_require_krb5_auth_after_chauthtok(struct pwb_context *ctx,
const char *user)
{
/* Make sure that we only do this if a) the chauthtok got initiated
* during a logon attempt (authenticate->acct_mgmt->chauthtok) b) any
* later password change via the "passwd" command if done by the user
* itself
* NB. If we login from gdm or xdm and the password expires,
* we change the password, but there is no memory cache.
* Thus, even for passthrough login, we should do the
* authentication again to update memory cache.
* --- BoYang
* */
char *new_authtok_reqd_during_auth = NULL;
struct passwd *pwd = NULL;
_pam_get_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
&new_authtok_reqd_during_auth);
pam_set_data(ctx->pamh, PAM_WINBIND_NEW_AUTHTOK_REQD_DURING_AUTH,
NULL, NULL);
if (new_authtok_reqd_during_auth) {
return true;
}
pwd = getpwnam(user);
if (!pwd) {
return false;
}
if (getuid() == pwd->pw_uid) {
return true;
}
return false;
}
PAM_EXTERN
int pam_sm_chauthtok(pam_handle_t * pamh, int flags,
int argc, const char **argv)
{
unsigned int lctrl;
int ret;
bool cached_login = false;
/* <DO NOT free() THESE> */
const char *user;
char *pass_old, *pass_new;
/* </DO NOT free() THESE> */
char *Announce;
int retry = 0;
char *username_ret = NULL;
struct wbcAuthErrorInfo *error = NULL;
struct pwb_context *ctx = NULL;
ret = _pam_winbind_init_context(pamh, flags, argc, argv, &ctx);
if (ret) {
goto out;
}
_PAM_LOG_FUNCTION_ENTER("pam_sm_chauthtok", ctx);
cached_login = (ctx->ctrl & WINBIND_CACHED_LOGIN);
/* clearing offline bit for auth */
ctx->ctrl &= ~WINBIND_CACHED_LOGIN;
/*
* First get the name of a user
*/
ret = pam_get_user(pamh, &user, _("Username: "));
if (ret) {
_pam_log(ctx, LOG_ERR,
"password - could not identify user");
goto out;
}
if (user == NULL) {
_pam_log(ctx, LOG_ERR, "username was NULL!");
ret = PAM_USER_UNKNOWN;
goto out;
}
_pam_log_debug(ctx, LOG_DEBUG, "username [%s] obtained", user);
/* check if this is really a user in winbindd, not only in NSS */
ret = valid_user(ctx, user);
switch (ret) {
case 1:
ret = PAM_USER_UNKNOWN;
goto out;
case -1:
ret = PAM_SYSTEM_ERR;
goto out;
default:
break;
}
/*
* obtain and verify the current password (OLDAUTHTOK) for
* the user.
*/
if (flags & PAM_PRELIM_CHECK) {
time_t pwdlastset_prelim = 0;
/* instruct user what is happening */
#define greeting _("Changing password for")
Announce = talloc_asprintf(ctx, "%s %s", greeting, user);
if (!Announce) {
_pam_log(ctx, LOG_CRIT,
"password - out of memory");
ret = PAM_BUF_ERR;
goto out;
}
#undef greeting
lctrl = ctx->ctrl | WINBIND__OLD_PASSWORD;
ret = _winbind_read_password(ctx, lctrl,
Announce,
_("(current) NT password: "),
NULL,
(const char **) &pass_old);
TALLOC_FREE(Announce);
if (ret != PAM_SUCCESS) {
_pam_log(ctx, LOG_NOTICE,
"password - (old) token not obtained");
goto out;
}
/* verify that this is the password for this user */
ret = winbind_auth_request(ctx, user, pass_old,
NULL, NULL, 0,
&error, NULL, NULL,
&pwdlastset_prelim, NULL);
if (ret != PAM_ACCT_EXPIRED &&
ret != PAM_AUTHTOK_EXPIRED &&
ret != PAM_NEW_AUTHTOK_REQD &&
ret != PAM_SUCCESS) {
pass_old = NULL;
goto out;
}
pam_set_data(pamh, PAM_WINBIND_PWD_LAST_SET,
(void *)pwdlastset_prelim, NULL);
ret = pam_set_item(pamh, PAM_OLDAUTHTOK,
(const void *) pass_old);
pass_old = NULL;
if (ret != PAM_SUCCESS) {
_pam_log(ctx, LOG_CRIT,
"failed to set PAM_OLDAUTHTOK");
}
} else if (flags & PAM_UPDATE_AUTHTOK) {
time_t pwdlastset_update = 0;
/*
* obtain the proposed password
*/
/*
* get the old token back.
*/
ret = _pam_get_item(pamh, PAM_OLDAUTHTOK, &pass_old);
if (ret != PAM_SUCCESS) {
_pam_log(ctx, LOG_NOTICE,
"user not authenticated");
goto out;
}
lctrl = ctx->ctrl & ~WINBIND_TRY_FIRST_PASS_ARG;
if (on(WINBIND_USE_AUTHTOK_ARG, lctrl)) {
lctrl |= WINBIND_USE_FIRST_PASS_ARG;
}
retry = 0;
ret = PAM_AUTHTOK_ERR;
while ((ret != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) {
/*
* use_authtok is to force the use of a previously entered
* password -- needed for pluggable password strength checking
*/
ret = _winbind_read_password(ctx, lctrl,
NULL,
_("Enter new NT password: "),
_("Retype new NT password: "),
(const char **)&pass_new);
if (ret != PAM_SUCCESS) {
_pam_log_debug(ctx, LOG_ALERT,
"password - "
"new password not obtained");
pass_old = NULL;/* tidy up */
goto out;
}
/*
* At this point we know who the user is and what they
* propose as their new password. Verify that the new
* password is acceptable.
*/
if (pass_new[0] == '\0') {/* "\0" password = NULL */
pass_new = NULL;
}
}
/*
* By reaching here we have approved the passwords and must now
* rebuild the password database file.
*/
_pam_get_data(pamh, PAM_WINBIND_PWD_LAST_SET,
&pwdlastset_update);
/*
* if cached creds were enabled, make sure to set the
* WINBIND_CACHED_LOGIN bit here in order to have winbindd
* update the cached creds storage - gd
*/
if (cached_login) {
ctx->ctrl |= WINBIND_CACHED_LOGIN;
}
ret = winbind_chauthtok_request(ctx, user, pass_old,
pass_new, pwdlastset_update);
if (ret) {
pass_old = pass_new = NULL;
goto out;
}
if (_pam_require_krb5_auth_after_chauthtok(ctx, user)) {
const char *member = NULL;
const char *cctype = NULL;
int warn_pwd_expire;
struct wbcLogonUserInfo *info = NULL;
struct wbcUserPasswordPolicyInfo *policy = NULL;
member = get_member_from_config(ctx);
cctype = get_krb5_cc_type_from_config(ctx);
warn_pwd_expire = get_warn_pwd_expire_from_config(ctx);
/* Keep WINBIND_CACHED_LOGIN bit for
* authentication after changing the password.
* This will update the cached credentials in case
* that winbindd_dual_pam_chauthtok() fails
* to update them.
* --- BoYang
* */
ret = winbind_auth_request(ctx, user, pass_new,
member, cctype, 0,
&error, &info, &policy,
NULL, &username_ret);
pass_old = pass_new = NULL;
if (ret == PAM_SUCCESS) {
struct wbcAuthUserInfo *user_info = NULL;
if (info && info->info) {
user_info = info->info;
}
/* warn a user if the password is about to
* expire soon */
_pam_warn_password_expiry(ctx, user_info, policy,
warn_pwd_expire,
NULL);
/* set some info3 info for other modules in the
* stack */
_pam_set_data_info3(ctx, user_info);
/* put krb5ccname into env */
_pam_setup_krb5_env(ctx, info);
if (username_ret) {
pam_set_item(pamh, PAM_USER,
username_ret);
_pam_log_debug(ctx, LOG_INFO,
"Returned user was '%s'",
username_ret);
free(username_ret);
}
}
if (info && info->blobs) {
wbcFreeMemory(info->blobs);
}
wbcFreeMemory(info);
wbcFreeMemory(policy);
goto out;
}
} else {
ret = PAM_SERVICE_ERR;
}
out:
{
/* Deal with offline errors. */
int i;
const char *codes[] = {
"NT_STATUS_DOMAIN_CONTROLLER_NOT_FOUND",
"NT_STATUS_NO_LOGON_SERVERS",
"NT_STATUS_ACCESS_DENIED"
};
for (i=0; i<ARRAY_SIZE(codes); i++) {
int _ret;
if (_pam_check_remark_auth_err(ctx, error, codes[i], &_ret)) {
break;
}
}
}
wbcFreeMemory(error);
_PAM_LOG_FUNCTION_LEAVE("pam_sm_chauthtok", ctx, ret);
TALLOC_FREE(ctx);
return ret;
}
#ifdef PAM_STATIC
/* static module data */
struct pam_module _pam_winbind_modstruct = {
MODULE_NAME,
pam_sm_authenticate,
pam_sm_setcred,
pam_sm_acct_mgmt,
pam_sm_open_session,
pam_sm_close_session,
pam_sm_chauthtok
};
#endif
/*
* Copyright (c) Andrew Tridgell <tridge@samba.org> 2000
* Copyright (c) Tim Potter <tpot@samba.org> 2000
* Copyright (c) Andrew Bartlettt <abartlet@samba.org> 2002
* Copyright (c) Guenther Deschner <gd@samba.org> 2005-2008
* Copyright (c) Jan Rêkorajski 1999.
* Copyright (c) Andrew G. Morgan 1996-8.
* Copyright (c) Alex O. Yuriev, 1996.
* Copyright (c) Cristian Gafton 1996.
* Copyright (C) Elliot Lee <sopwith@redhat.com> 1996, Red Hat Software.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* ALTERNATIVELY, this product may be distributed under the terms of
* the GNU Public License, in which case the provisions of the GPL are
* required INSTEAD OF the above restrictions. (This clause is
* necessary due to a potential bad interaction between the GPL and
* the restrictions contained in a BSD-style copyright.)
*
* THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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