CVE-2013-4408:s3:Ensure we always check call_id when validating an RPC reply.
[Samba.git] / source3 / pam_smbpass / pam_smb_auth.c
blobd63f0806c3ef093762abd983e6294d7fb1f5cb34
1 /* Unix NT password database implementation, version 0.7.5.
3 * This program is free software; you can redistribute it and/or modify it under
4 * the terms of the GNU General Public License as published by the Free
5 * Software Foundation; either version 3 of the License, or (at your option)
6 * any later version.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, see <http://www.gnu.org/licenses/>.
17 /* indicate the following groups are defined */
18 #define PAM_SM_AUTH
20 #include "includes.h"
21 #include "lib/util/debug.h"
23 #ifndef LINUX
25 /* This is only used in the Sun implementation. */
26 #if defined(HAVE_SECURITY_PAM_APPL_H)
27 #include <security/pam_appl.h>
28 #elif defined(HAVE_PAM_PAM_APPL_H)
29 #include <pam/pam_appl.h>
30 #endif
32 #endif /* LINUX */
34 #if defined(HAVE_SECURITY_PAM_MODULES_H)
35 #include <security/pam_modules.h>
36 #elif defined(HAVE_PAM_PAM_MODULES_H)
37 #include <pam/pam_modules.h>
38 #endif
40 #include "general.h"
42 #include "support.h"
44 #define AUTH_RETURN \
45 do { \
46 /* Restore application signal handler */ \
47 CatchSignal(SIGPIPE, oldsig_handler); \
48 if(ret_data) { \
49 *ret_data = retval; \
50 pam_set_data( pamh, "smb_setcred_return" \
51 , (void *) ret_data, NULL ); \
52 } \
53 return retval; \
54 } while (0)
56 static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
57 const char *name, struct samu *sampass, bool exist);
61 * pam_sm_authenticate() authenticates users against the samba password file.
63 * First, obtain the password from the user. Then use a
64 * routine in 'support.c' to authenticate the user.
67 #define _SMB_AUTHTOK "-SMB-PASS"
69 int pam_sm_authenticate(pam_handle_t *pamh, int flags,
70 int argc, const char **argv)
72 unsigned int ctrl;
73 int retval, *ret_data = NULL;
74 struct samu *sampass = NULL;
75 const char *name;
76 void (*oldsig_handler)(int) = NULL;
77 bool found;
79 /* Points to memory managed by the PAM library. Do not free. */
80 char *p = NULL;
82 /* Samba initialization. */
83 load_case_tables_library();
84 lp_set_in_client(True);
86 ctrl = set_ctrl(pamh, flags, argc, argv);
88 /* Get a few bytes so we can pass our return value to
89 pam_sm_setcred(). */
90 ret_data = SMB_MALLOC_P(int);
92 /* we need to do this before we call AUTH_RETURN */
93 /* Getting into places that might use LDAP -- protect the app
94 from a SIGPIPE it's not expecting */
95 oldsig_handler = CatchSignal(SIGPIPE, SIG_IGN);
97 /* get the username */
98 retval = pam_get_user( pamh, &name, "Username: " );
99 if ( retval != PAM_SUCCESS ) {
100 if (on( SMB_DEBUG, ctrl )) {
101 _log_err(pamh, LOG_DEBUG, "auth: could not identify user");
103 AUTH_RETURN;
105 if (on( SMB_DEBUG, ctrl )) {
106 _log_err(pamh, LOG_DEBUG, "username [%s] obtained", name );
109 if (geteuid() != 0) {
110 _log_err(pamh, LOG_DEBUG, "Cannot access samba password database, not running as root.");
111 retval = PAM_AUTHINFO_UNAVAIL;
112 AUTH_RETURN;
115 if (!initialize_password_db(True, NULL)) {
116 _log_err(pamh, LOG_ALERT, "Cannot access samba password database" );
117 retval = PAM_AUTHINFO_UNAVAIL;
118 AUTH_RETURN;
121 sampass = samu_new( NULL );
122 if (!sampass) {
123 _log_err(pamh, LOG_ALERT, "Cannot talloc a samu struct" );
124 retval = nt_status_to_pam(NT_STATUS_NO_MEMORY);
125 AUTH_RETURN;
128 found = pdb_getsampwnam( sampass, name );
130 if (on( SMB_MIGRATE, ctrl )) {
131 retval = _smb_add_user(pamh, ctrl, name, sampass, found);
132 TALLOC_FREE(sampass);
133 AUTH_RETURN;
136 if (!found) {
137 _log_err(pamh, LOG_ALERT, "Failed to find entry for user %s.", name);
138 retval = PAM_USER_UNKNOWN;
139 TALLOC_FREE(sampass);
140 sampass = NULL;
141 AUTH_RETURN;
144 /* if this user does not have a password... */
146 if (_smb_blankpasswd( ctrl, sampass )) {
147 TALLOC_FREE(sampass);
148 retval = PAM_SUCCESS;
149 AUTH_RETURN;
152 /* get this user's authentication token */
154 retval = _smb_read_password(pamh, ctrl, NULL, "Password: ", NULL, _SMB_AUTHTOK, &p);
155 if (retval != PAM_SUCCESS ) {
156 _log_err(pamh,LOG_CRIT, "auth: no password provided for [%s]", name);
157 TALLOC_FREE(sampass);
158 AUTH_RETURN;
161 /* verify the password of this user */
163 retval = _smb_verify_password( pamh, sampass, p, ctrl );
164 TALLOC_FREE(sampass);
165 p = NULL;
166 AUTH_RETURN;
170 * This function is for setting samba credentials. If anyone comes up
171 * with any credentials they think should be set, let me know.
174 int pam_sm_setcred(pam_handle_t *pamh, int flags,
175 int argc, const char **argv)
177 int retval, *pretval = NULL;
179 retval = PAM_SUCCESS;
181 _pam_get_data(pamh, "smb_setcred_return", &pretval);
182 if(pretval) {
183 retval = *pretval;
184 SAFE_FREE(pretval);
186 pam_set_data(pamh, "smb_setcred_return", NULL, NULL);
188 return retval;
191 /* Helper function for adding a user to the db. */
192 static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
193 const char *name, struct samu *sampass, bool exist)
195 char *err_str = NULL;
196 char *msg_str = NULL;
197 const char *pass = NULL;
198 int retval;
200 /* Get the authtok; if we don't have one, silently fail. */
201 retval = _pam_get_item( pamh, PAM_AUTHTOK, &pass );
203 if (retval != PAM_SUCCESS) {
204 _log_err(pamh, LOG_ALERT
205 , "pam_get_item returned error to pam_sm_authenticate" );
206 return PAM_AUTHTOK_RECOVER_ERR;
207 } else if (pass == NULL) {
208 return PAM_AUTHTOK_RECOVER_ERR;
211 /* Add the user to the db if they aren't already there. */
212 if (!exist) {
213 retval = NT_STATUS_IS_OK(local_password_change(name, LOCAL_ADD_USER|LOCAL_SET_PASSWORD,
214 pass, &err_str, &msg_str));
215 if (!retval && err_str) {
216 make_remark(pamh, ctrl, PAM_ERROR_MSG, err_str );
217 } else if (msg_str) {
218 make_remark(pamh, ctrl, PAM_TEXT_INFO, msg_str );
220 pass = NULL;
222 SAFE_FREE(err_str);
223 SAFE_FREE(msg_str);
224 return PAM_IGNORE;
225 } else {
226 /* mimick 'update encrypted' as long as the 'no pw req' flag is not set */
227 if ( pdb_get_acct_ctrl(sampass) & ~ACB_PWNOTREQ ) {
228 retval = NT_STATUS_IS_OK(local_password_change(name, LOCAL_SET_PASSWORD,
229 pass, &err_str, &msg_str));
230 if (!retval && err_str) {
231 make_remark(pamh, ctrl, PAM_ERROR_MSG, err_str );
232 } else if (msg_str) {
233 make_remark(pamh, ctrl, PAM_TEXT_INFO, msg_str );
238 SAFE_FREE(err_str);
239 SAFE_FREE(msg_str);
240 pass = NULL;
241 return PAM_IGNORE;
244 /* static module data */
245 #ifdef PAM_STATIC
246 struct pam_module _pam_smbpass_auth_modstruct = {
247 "pam_smbpass",
248 pam_sm_authenticate,
249 pam_sm_setcred,
250 NULL,
251 NULL,
252 NULL,
253 NULL
255 #endif