2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
10 #include <afsconfig.h>
11 #include <afs/param.h>
15 #ifdef HAVE_SYS_WAIT_H
19 #include <security/pam_appl.h>
20 #include <security/pam_modules.h>
22 #include <afs/kautils.h>
23 #include "afs_message.h"
25 #include "afs_pam_msg.h"
27 #define RET(x) { retcode = (x); goto out; }
30 pam_sm_chauthtok(pam_handle_t * pamh, int flags, int argc, const char **argv)
32 int retcode = PAM_SUCCESS;
33 int errcode = PAM_SUCCESS;
36 int logmask = LOG_UPTO(LOG_INFO);
38 int use_first_pass = 0;
39 int try_first_pass = 0;
41 int got_authtok = 0; /* got PAM_AUTHTOK upon entry */
42 int torch_password = 1;
44 char my_password_buf[256];
49 PAM_CONST char *user = NULL, *password = NULL;
50 char *new_password = NULL, *verify_password = NULL;
51 char upwd_buf[2048]; /* size is a guess. */
53 struct ktc_encryptionKey oldkey, newkey;
54 struct ktc_token token;
55 struct ubik_client *conn = 0;
56 PAM_CONST struct pam_conv *pam_convp = NULL;
57 struct passwd unix_pwd, *upwd = NULL;
60 openlog(pam_afs_ident, LOG_CONS, LOG_AUTH);
62 origmask = setlogmask(logmask);
65 * Parse the user options. Log an error for any unknown options.
67 * Todo options: PAM_SILENT
69 for (i = 0; i < argc; i++) {
70 if (strcasecmp(argv[i], "debug") == 0) {
71 logmask |= LOG_MASK(LOG_DEBUG);
72 (void)setlogmask(logmask);
73 } else if (strcasecmp(argv[i], "nowarn") == 0) {
75 } else if (strcasecmp(argv[i], "use_first_pass") == 0) {
77 } else if (strcasecmp(argv[i], "try_first_pass") == 0) {
79 } else if (strcasecmp(argv[i], "ignore_root") == 0) {
82 pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
89 if (logmask && LOG_MASK(LOG_DEBUG)) {
90 pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass,
92 pam_afs_syslog(LOG_DEBUG, PAMAFS_PAMERROR, flags);
95 /* Try to get the user-interaction info, if available. */
96 errcode = pam_get_item(pamh, PAM_CONV, (PAM_CONST void **)&pam_convp);
97 if (errcode != PAM_SUCCESS) {
98 pam_afs_syslog(LOG_WARNING, PAMAFS_NO_USER_INT);
102 /* Who are we trying to authenticate here? */
104 pam_get_user(pamh, &user,
105 "AFS username: ")) != PAM_SUCCESS) {
106 pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
107 RET(PAM_USER_UNKNOWN);
110 if (logmask && LOG_MASK(LOG_DEBUG))
111 pam_afs_syslog(LOG_DEBUG, PAMAFS_USERNAMEDEBUG, user);
114 * If the user has a "local" (or via nss, possibly nss_dce) pwent,
115 * and its uid==0, and "ignore_root" was given in pam.conf,
118 #if defined(AFS_HPUX_ENV) || defined(AFS_DARWIN100_ENV) || defined(AFS_SUN58_ENV)
119 #if defined(AFS_HPUX110_ENV) || defined(AFS_DARWIN100_ENV) || defined(AFS_SUN58_ENV)
120 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
121 #else /* AFS_HPUX110_ENV */
122 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
123 if (i == 0) /* getpwnam_r success */
125 #endif /* else AFS_HPUX110_ENV */
126 if (ignore_root && i == 0 && upwd && upwd->pw_uid == 0) {
127 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
131 #if defined(AFS_LINUX20_ENV) || defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV) || defined(AFS_NBSD_ENV)
132 upwd = getpwnam(user);
134 upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
136 if (ignore_root && upwd != NULL && upwd->pw_uid == 0) {
137 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
142 errcode = pam_get_item(pamh, PAM_AUTHTOK, (PAM_CONST void **)&password);
143 if (errcode != PAM_SUCCESS || password == NULL) {
144 if (use_first_pass) {
145 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
148 password = NULL; /* In case it isn't already NULL */
149 if (logmask && LOG_MASK(LOG_DEBUG))
150 pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
151 } else if (password[0] == '\0') {
152 /* Actually we *did* get one but it was empty. */
154 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
155 RET(PAM_NEW_AUTHTOK_REQD);
157 if (logmask && LOG_MASK(LOG_DEBUG))
158 pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
162 if (!(use_first_pass || try_first_pass)) {
166 if (password == NULL) {
167 char *prompt_password;
170 RET(PAM_AUTH_ERR); /* shouldn't happen */
173 if (pam_convp == NULL || pam_convp->conv == NULL) {
174 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
178 errcode = pam_afs_prompt(pam_convp, &prompt_password, 0, PAMAFS_PWD_PROMPT);
179 if (errcode != PAM_SUCCESS || prompt_password == NULL) {
180 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
183 if (prompt_password[0] == '\0') {
184 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
185 RET(PAM_NEW_AUTHTOK_REQD);
189 * We aren't going to free the password later (we will wipe it,
190 * though), because the storage for it if we get it from other
191 * paths may belong to someone else. Since we do need to free
192 * this storage, copy it to a buffer that won't need to be freed
193 * later, and free this storage now.
195 strncpy(my_password_buf, prompt_password, sizeof(my_password_buf));
196 my_password_buf[sizeof(my_password_buf) - 1] = '\0';
197 memset(prompt_password, 0, strlen(password));
198 free(prompt_password);
199 password = my_password_buf;
202 if ((code = ka_VerifyUserPassword(KA_USERAUTH_VERSION + KA_USERAUTH_DOSETPAG, (char *)user, /* kerberos name */
205 (char *)password, /* password */
207 &reason /* error string */ )) != 0) {
208 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
212 pam_set_item(pamh, PAM_AUTHTOK, password);
213 pam_set_item(pamh, PAM_OLDAUTHTOK, password);
214 if (flags & PAM_PRELIM_CHECK) {
215 /* only auth check was requested, so return success here */
216 return (PAM_SUCCESS);
218 if (!(flags & PAM_UPDATE_AUTHTOK)) {
219 /* these lines are never executed ... */
220 /* UPDATE_AUTHTOK flag is required, return with error */
221 pam_afs_syslog(LOG_ERR, PAMAFS_FLAGS, "PAM_UPDATE_AUTHTOK");
225 /* get the new passwd and verify it */
227 pam_afs_prompt(pam_convp, &new_password, 0, PAMAFS_NEW_PWD_PROMPT);
228 if (errcode != PAM_SUCCESS || new_password == NULL) {
229 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
232 if (new_password[0] == '\0') {
233 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
237 pam_afs_prompt(pam_convp, &verify_password, 0,
238 PAMAFS_VERIFY_PWD_PROMPT);
239 if (errcode != PAM_SUCCESS || verify_password == NULL) {
240 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
241 memset(new_password, 0, strlen(new_password));
244 if (verify_password[0] == '\0') {
245 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
246 memset(new_password, 0, strlen(new_password));
249 if (strcmp(new_password, verify_password) != 0) {
250 pam_afs_syslog(LOG_INFO, PAMAFS_NE_PASSWORD);
251 memset(new_password, 0, strlen(new_password));
252 memset(verify_password, 0, strlen(verify_password));
255 memset(verify_password, 0, strlen(verify_password));
256 /* checking password length and quality is up to other PAM modules */
258 /* set the new password */
259 if ((code = ka_Init(0)) != 0) {
260 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
263 if ((code = rx_Init(0)) != 0) {
264 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
267 strcpy(instance, "");
268 if ((localcell = ka_LocalCell()) == NULL) {
269 pam_afs_syslog(LOG_ERR, PAMAFS_NOCELLNAME);
272 strcpy(realm, localcell);
274 /* oldkey is not used in ka_ChangePassword (only for ka_auth) */
275 ka_StringToKey((char *)password, realm, &oldkey);
276 ka_StringToKey(new_password, realm, &newkey);
278 ka_GetAdminToken((char *)user, instance, realm, &oldkey, 20, &token,
280 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
284 ka_AuthServerConn(realm, KA_MAINTENANCE_SERVICE, &token,
286 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
289 if ((code = ka_ChangePassword((char *)user, /* kerberos name */
290 instance, /* instance */
292 0, /* old password unused */
293 &newkey /* new password */ )) != 0) {
294 pam_afs_syslog(LOG_ERR, PAMAFS_KAPASS_FAIL);
295 memset(new_password, 0, strlen(new_password));
298 pam_set_item(pamh, PAM_AUTHTOK, new_password);
303 if (password && torch_password) {
304 memset((char *)password, 0, strlen(password));
306 (void)setlogmask(origmask);
307 #ifndef AFS_SUN56_ENV