source: branches/samba-3.0/source/pam_smbpass/pam_smb_auth.c@ 693

Last change on this file since 693 was 134, checked in by Paul Smedley, 18 years ago

Update source to 3.0.29
File size: 7.1 KB
Line 
1/* Unix NT password database implementation, version 0.7.5.
2 *
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 2 of the License, or (at your option)
6 * any later version.
7 *
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.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 675
15 * Mass Ave, Cambridge, MA 02139, USA.
16*/
17
18/* indicate the following groups are defined */
19#define PAM_SM_AUTH
20
21#include "includes.h"
22#include "debug.h"
23
24#ifndef LINUX
25
26/* This is only used in the Sun implementation. */
27#include <security/pam_appl.h>
28
29#endif /* LINUX */
30
31#include <security/pam_modules.h>
32
33#include "general.h"
34
35#include "support.h"
36
37#define AUTH_RETURN \
38do { \
39 /* Restore application signal handler */ \
40 CatchSignal(SIGPIPE, SIGNAL_CAST oldsig_handler); \
41 if(ret_data) { \
42 *ret_data = retval; \
43 pam_set_data( pamh, "smb_setcred_return" \
44 , (void *) ret_data, NULL ); \
45 } \
46 return retval; \
47} while (0)
48
49static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
50 const char *name, struct samu *sampass, BOOL exist);
51
52
53/*
54 * pam_sm_authenticate() authenticates users against the samba password file.
55 *
56 * First, obtain the password from the user. Then use a
57 * routine in 'support.c' to authenticate the user.
58 */
59
60#define _SMB_AUTHTOK "-SMB-PASS"
61
62int pam_sm_authenticate(pam_handle_t *pamh, int flags,
63 int argc, const char **argv)
64{
65 unsigned int ctrl;
66 int retval, *ret_data = NULL;
67 struct samu *sampass = NULL;
68 extern BOOL in_client;
69 const char *name;
70 void (*oldsig_handler)(int) = NULL;
71 BOOL found;
72
73 /* Points to memory managed by the PAM library. Do not free. */
74 char *p = NULL;
75
76 /* Samba initialization. */
77 load_case_tables();
78 setup_logging("pam_smbpass",False);
79 in_client = True;
80
81 ctrl = set_ctrl(flags, argc, argv);
82
83 /* Get a few bytes so we can pass our return value to
84 pam_sm_setcred(). */
85 ret_data = SMB_MALLOC_P(int);
86
87 /* we need to do this before we call AUTH_RETURN */
88 /* Getting into places that might use LDAP -- protect the app
89 from a SIGPIPE it's not expecting */
90 oldsig_handler = CatchSignal(SIGPIPE, SIGNAL_CAST SIG_IGN);
91
92 /* get the username */
93 retval = pam_get_user( pamh, &name, "Username: " );
94 if ( retval != PAM_SUCCESS ) {
95 if (on( SMB_DEBUG, ctrl )) {
96 _log_err(LOG_DEBUG, "auth: could not identify user");
97 }
98 AUTH_RETURN;
99 }
100 if (on( SMB_DEBUG, ctrl )) {
101 _log_err( LOG_DEBUG, "username [%s] obtained", name );
102 }
103
104 if (geteuid() != 0) {
105 _log_err(LOG_DEBUG, "Cannot access samba password database, not running as root.");
106 retval = PAM_AUTHINFO_UNAVAIL;
107 AUTH_RETURN;
108 }
109
110 if (!initialize_password_db(True)) {
111 _log_err( LOG_ALERT, "Cannot access samba password database" );
112 retval = PAM_AUTHINFO_UNAVAIL;
113 AUTH_RETURN;
114 }
115
116 sampass = samu_new( NULL );
117 if (!sampass) {
118 _log_err( LOG_ALERT, "Cannot talloc a samu struct" );
119 retval = nt_status_to_pam(NT_STATUS_NO_MEMORY);
120 AUTH_RETURN;
121 }
122
123 found = pdb_getsampwnam( sampass, name );
124
125 if (on( SMB_MIGRATE, ctrl )) {
126 retval = _smb_add_user(pamh, ctrl, name, sampass, found);
127 TALLOC_FREE(sampass);
128 AUTH_RETURN;
129 }
130
131 if (!found) {
132 _log_err(LOG_ALERT, "Failed to find entry for user %s.", name);
133 retval = PAM_USER_UNKNOWN;
134 TALLOC_FREE(sampass);
135 sampass = NULL;
136 AUTH_RETURN;
137 }
138
139 /* if this user does not have a password... */
140
141 if (_smb_blankpasswd( ctrl, sampass )) {
142 TALLOC_FREE(sampass);
143 retval = PAM_SUCCESS;
144 AUTH_RETURN;
145 }
146
147 /* get this user's authentication token */
148
149 retval = _smb_read_password(pamh, ctrl, NULL, "Password: ", NULL, _SMB_AUTHTOK, &p);
150 if (retval != PAM_SUCCESS ) {
151 _log_err(LOG_CRIT, "auth: no password provided for [%s]", name);
152 TALLOC_FREE(sampass);
153 AUTH_RETURN;
154 }
155
156 /* verify the password of this user */
157
158 retval = _smb_verify_password( pamh, sampass, p, ctrl );
159 TALLOC_FREE(sampass);
160 p = NULL;
161 AUTH_RETURN;
162}
163
164/*
165 * This function is for setting samba credentials. If anyone comes up
166 * with any credentials they think should be set, let me know.
167 */
168
169int pam_sm_setcred(pam_handle_t *pamh, int flags,
170 int argc, const char **argv)
171{
172 int retval, *pretval = NULL;
173
174 retval = PAM_SUCCESS;
175
176 pam_get_data(pamh, "smb_setcred_return", (const void **) &pretval);
177 if(pretval) {
178 retval = *pretval;
179 SAFE_FREE(pretval);
180 }
181 pam_set_data(pamh, "smb_setcred_return", NULL, NULL);
182
183 return retval;
184}
185
186
187/* Helper function for adding a user to the db. */
188static int _smb_add_user(pam_handle_t *pamh, unsigned int ctrl,
189 const char *name, struct samu *sampass, BOOL exist)
190{
191 pstring err_str;
192 pstring msg_str;
193 const char *pass = NULL;
194 int retval;
195
196 err_str[0] = '\0';
197 msg_str[0] = '\0';
198
199 /* Get the authtok; if we don't have one, silently fail. */
200 retval = pam_get_item( pamh, PAM_AUTHTOK, (const void **) &pass );
201
202 if (retval != PAM_SUCCESS) {
203 _log_err( LOG_ALERT
204 , "pam_get_item returned error to pam_sm_authenticate" );
205 return PAM_AUTHTOK_RECOVER_ERR;
206 } else if (pass == NULL) {
207 return PAM_AUTHTOK_RECOVER_ERR;
208 }
209
210 /* Add the user to the db if they aren't already there. */
211 if (!exist) {
212 retval = NT_STATUS_IS_OK(local_password_change( name, LOCAL_ADD_USER|LOCAL_SET_PASSWORD,
213 pass, err_str,
214 sizeof(err_str),
215 msg_str, sizeof(msg_str) ));
216 if (!retval && *err_str)
217 {
218 err_str[PSTRING_LEN-1] = '\0';
219 make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
220 }
221 else if (*msg_str)
222 {
223 msg_str[PSTRING_LEN-1] = '\0';
224 make_remark( pamh, ctrl, PAM_TEXT_INFO, msg_str );
225 }
226 pass = NULL;
227
228 return PAM_IGNORE;
229 }
230 else {
231 /* mimick 'update encrypted' as long as the 'no pw req' flag is not set */
232 if ( pdb_get_acct_ctrl(sampass) & ~ACB_PWNOTREQ )
233 {
234 retval = NT_STATUS_IS_OK(local_password_change( name, LOCAL_SET_PASSWORD, pass, err_str, sizeof(err_str),
235 msg_str, sizeof(msg_str) ));
236 if (!retval && *err_str)
237 {
238 err_str[PSTRING_LEN-1] = '\0';
239 make_remark( pamh, ctrl, PAM_ERROR_MSG, err_str );
240 }
241 else if (*msg_str)
242 {
243 msg_str[PSTRING_LEN-1] = '\0';
244 make_remark( pamh, ctrl, PAM_TEXT_INFO, msg_str );
245 }
246 }
247 }
248
249 pass = NULL;
250
251 return PAM_IGNORE;
252}
253
254
255/* static module data */
256#ifdef PAM_STATIC
257struct pam_module _pam_smbpass_auth_modstruct = {
258 "pam_smbpass",
259 pam_sm_authenticate,
260 pam_sm_setcred,
261 NULL,
262 NULL,
263 NULL,
264 NULL
265};
266#endif
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