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
15 #include <afsconfig.h>
16 #include <afs/param.h>
18 #include <security/pam_appl.h>
19 #include <security/pam_modules.h>
22 #include <sys/param.h>
23 #include <afs/kautils.h>
24 #include "afs_message.h"
26 #include "afs_pam_msg.h"
31 #define RET(x) { retcode = (x); goto out; }
34 pam_sm_chauthtok(pam_handle_t * pamh, int flags, int argc, const char **argv)
36 int retcode = PAM_SUCCESS;
37 int errcode = PAM_SUCCESS;
40 int logmask = LOG_UPTO(LOG_INFO);
42 int use_first_pass = 0;
43 int try_first_pass = 0;
45 int got_authtok = 0; /* got PAM_AUTHTOK upon entry */
46 int torch_password = 1;
48 char my_password_buf[256];
53 char *user = NULL, *password = NULL;
54 char *new_password = NULL, *verify_password = NULL;
55 char upwd_buf[2048]; /* size is a guess. */
57 struct ktc_encryptionKey oldkey, newkey;
58 struct ktc_token token;
59 struct ubik_client *conn = 0;
60 struct pam_conv *pam_convp = NULL;
61 struct passwd unix_pwd, *upwd = NULL;
64 openlog(pam_afs_ident, LOG_CONS, LOG_AUTH);
66 origmask = setlogmask(logmask);
69 * Parse the user options. Log an error for any unknown options.
71 * Todo options: PAM_SILENT
73 for (i = 0; i < argc; i++) {
74 if (strcasecmp(argv[i], "debug") == 0) {
75 logmask |= LOG_MASK(LOG_DEBUG);
76 (void)setlogmask(logmask);
77 } else if (strcasecmp(argv[i], "nowarn") == 0) {
79 } else if (strcasecmp(argv[i], "use_first_pass") == 0) {
81 } else if (strcasecmp(argv[i], "try_first_pass") == 0) {
83 } else if (strcasecmp(argv[i], "ignore_root") == 0) {
86 pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
93 if (logmask && LOG_MASK(LOG_DEBUG)) {
94 pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass,
96 pam_afs_syslog(LOG_DEBUG, PAMAFS_PAMERROR, flags);
99 /* Try to get the user-interaction info, if available. */
100 errcode = pam_get_item(pamh, PAM_CONV, (const void **)&pam_convp);
101 if (errcode != PAM_SUCCESS) {
102 pam_afs_syslog(LOG_WARNING, PAMAFS_NO_USER_INT);
106 /* Who are we trying to authenticate here? */
108 pam_get_user(pamh, (const char **)&user,
109 "AFS username: ")) != PAM_SUCCESS) {
110 pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
111 RET(PAM_USER_UNKNOWN);
114 if (logmask && LOG_MASK(LOG_DEBUG))
115 pam_afs_syslog(LOG_DEBUG, PAMAFS_USERNAMEDEBUG, user);
118 * If the user has a "local" (or via nss, possibly nss_dce) pwent,
119 * and its uid==0, and "ignore_root" was given in pam.conf,
122 #if defined(AFS_HPUX_ENV) || defined(AFS_DARWIN100_ENV)
123 #if defined(AFS_HPUX110_ENV) || defined(AFS_DARWIN100_ENV)
124 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
125 #else /* AFS_HPUX110_ENV */
126 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
127 if (i == 0) /* getpwnam_r success */
129 #endif /* else AFS_HPUX110_ENV */
130 if (ignore_root && i == 0 && upwd->pw_uid == 0) {
131 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
135 #if defined(AFS_LINUX20_ENV) || defined(AFS_FBSD_ENV) || defined(AFS_DFBSD_ENV) || defined(AFS_NBSD_ENV)
136 upwd = getpwnam(user);
138 upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
140 if (ignore_root && upwd != NULL && upwd->pw_uid == 0) {
141 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
146 errcode = pam_get_item(pamh, PAM_AUTHTOK, (const void **)&password);
147 if (errcode != PAM_SUCCESS || password == NULL) {
148 if (use_first_pass) {
149 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
152 password = NULL; /* In case it isn't already NULL */
153 if (logmask && LOG_MASK(LOG_DEBUG))
154 pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
155 } else if (password[0] == '\0') {
156 /* Actually we *did* get one but it was empty. */
158 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
159 RET(PAM_NEW_AUTHTOK_REQD);
161 if (logmask && LOG_MASK(LOG_DEBUG))
162 pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
166 if (!(use_first_pass || try_first_pass)) {
170 if (password == NULL) {
173 RET(PAM_AUTH_ERR); /* shouldn't happen */
176 if (pam_convp == NULL || pam_convp->conv == NULL) {
177 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
181 errcode = pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
182 if (errcode != PAM_SUCCESS || password == NULL) {
183 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
186 if (password[0] == '\0') {
187 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
188 RET(PAM_NEW_AUTHTOK_REQD);
192 * We aren't going to free the password later (we will wipe it,
193 * though), because the storage for it if we get it from other
194 * paths may belong to someone else. Since we do need to free
195 * this storage, copy it to a buffer that won't need to be freed
196 * later, and free this storage now.
198 strncpy(my_password_buf, password, sizeof(my_password_buf));
199 my_password_buf[sizeof(my_password_buf) - 1] = '\0';
200 memset(password, 0, strlen(password));
202 password = my_password_buf;
205 if ((code = ka_VerifyUserPassword(KA_USERAUTH_VERSION + KA_USERAUTH_DOSETPAG, user, /* kerberos name */
208 password, /* password */
210 &reason /* error string */ )) != 0) {
211 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
215 pam_set_item(pamh, PAM_AUTHTOK, password);
216 pam_set_item(pamh, PAM_OLDAUTHTOK, password);
217 if (flags & PAM_PRELIM_CHECK) {
218 /* only auth check was requested, so return success here */
219 return (PAM_SUCCESS);
221 if (!(flags & PAM_UPDATE_AUTHTOK)) {
222 /* these lines are never executed ... */
223 /* UPDATE_AUTHTOK flag is required, return with error */
224 pam_afs_syslog(LOG_ERR, PAMAFS_FLAGS, "PAM_UPDATE_AUTHTOK");
228 /* get the new passwd and verify it */
230 pam_afs_prompt(pam_convp, &new_password, 0, PAMAFS_NEW_PWD_PROMPT);
231 if (errcode != PAM_SUCCESS || new_password == NULL) {
232 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
235 if (new_password[0] == '\0') {
236 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
240 pam_afs_prompt(pam_convp, &verify_password, 0,
241 PAMAFS_VERIFY_PWD_PROMPT);
242 if (errcode != PAM_SUCCESS || verify_password == NULL) {
243 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
244 memset(new_password, 0, strlen(new_password));
247 if (verify_password[0] == '\0') {
248 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
249 memset(new_password, 0, strlen(new_password));
252 if (strcmp(new_password, verify_password) != 0) {
253 pam_afs_syslog(LOG_INFO, PAMAFS_NE_PASSWORD);
254 memset(new_password, 0, strlen(new_password));
255 memset(verify_password, 0, strlen(verify_password));
258 memset(verify_password, 0, strlen(verify_password));
259 /* checking password length and quality is up to other PAM modules */
261 /* set the new password */
262 if ((code = ka_Init(0)) != 0) {
263 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
266 if ((code = rx_Init(0)) != 0) {
267 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
270 strcpy(instance, "");
271 if ((localcell = ka_LocalCell()) == NULL) {
272 pam_afs_syslog(LOG_ERR, PAMAFS_NOCELLNAME);
275 strcpy(realm, localcell);
277 /* oldkey is not used in ka_ChangePassword (only for ka_auth) */
278 ka_StringToKey(password, realm, &oldkey);
279 ka_StringToKey(new_password, realm, &newkey);
281 ka_GetAdminToken(user, instance, realm, &oldkey, 20, &token,
283 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
287 ka_AuthServerConn(realm, KA_MAINTENANCE_SERVICE, &token,
289 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
292 if ((code = ka_ChangePassword(user, /* kerberos name */
293 instance, /* instance */
295 0, /* old password unused */
296 &newkey /* new password */ )) != 0) {
297 pam_afs_syslog(LOG_ERR, PAMAFS_KAPASS_FAIL);
298 memset(new_password, 0, strlen(new_password));
301 pam_set_item(pamh, PAM_AUTHTOK, new_password);
306 if (password && torch_password) {
307 memset(password, 0, strlen(password));
309 (void)setlogmask(origmask);
310 #ifndef AFS_SUN56_ENV