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 <security/pam_appl.h>
11 #include <security/pam_modules.h>
17 #include <afs/param.h>
18 #include <sys/param.h>
19 #include <afs/kautils.h>
20 #include "afs_message.h"
22 #include "afs_pam_msg.h"
27 #define RET(x) { retcode = (x); goto out; }
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]);
90 if (use_first_pass) try_first_pass = 0;
92 pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass, try_first_pass);
93 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, (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? */
103 if ((errcode = pam_get_user(pamh, (const char **)&user, "AFS username: ")) != PAM_SUCCESS) {
104 pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
105 RET(PAM_USER_UNKNOWN);
108 pam_afs_syslog(LOG_DEBUG, PAMAFS_USERNAMEDEBUG, user);
111 * If the user has a "local" (or via nss, possibly nss_dce) pwent,
112 * and its uid==0, and "ignore_root" was given in pam.conf,
115 #if defined(AFS_HPUX_ENV)
116 #if defined(AFS_HPUX110_ENV)
117 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
118 #else /* AFS_HPUX110_ENV */
119 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
120 if ( i == 0 ) /* getpwnam_r success */
122 #endif /* else AFS_HPUX110_ENV */
123 if (ignore_root && i == 0 && upwd->pw_uid == 0) {
124 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
128 #ifdef AFS_LINUX20_ENV
129 upwd = getpwnam(user);
131 upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
133 if (ignore_root && upwd != NULL && upwd->pw_uid == 0) {
134 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
139 errcode = pam_get_item(pamh, PAM_AUTHTOK, (const void **) &password);
140 if (errcode != PAM_SUCCESS || password == NULL) {
141 if (use_first_pass) {
142 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
145 password = NULL; /* In case it isn't already NULL */
146 pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
147 } else if (password[0] == '\0') {
148 /* Actually we *did* get one but it was empty. */
150 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
151 RET(PAM_NEW_AUTHTOK_REQD);
153 pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
157 if (!(use_first_pass || try_first_pass)) {
161 if (password == NULL) {
164 RET(PAM_AUTH_ERR); /* shouldn't happen */
167 if (pam_convp == NULL || pam_convp->conv == NULL) {
168 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
172 errcode = pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
173 if (errcode != PAM_SUCCESS || password == NULL) {
174 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
177 if (password[0] == '\0') {
178 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
179 RET(PAM_NEW_AUTHTOK_REQD);
183 * We aren't going to free the password later (we will wipe it,
184 * though), because the storage for it if we get it from other
185 * paths may belong to someone else. Since we do need to free
186 * this storage, copy it to a buffer that won't need to be freed
187 * later, and free this storage now.
189 strncpy(my_password_buf, password, sizeof(my_password_buf));
190 my_password_buf[sizeof(my_password_buf)-1] = '\0';
191 memset(password, 0, strlen(password));
193 password = my_password_buf;
196 if ( (code = ka_VerifyUserPassword(KA_USERAUTH_VERSION + KA_USERAUTH_DOSETPAG,
197 user, /* kerberos name */
198 (char *)0, /* instance */
199 (char *)0, /* realm */
200 password, /* password */
202 &reason /* error string */ )) !=0 ) {
203 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
207 pam_set_item(pamh, PAM_AUTHTOK, password);
208 pam_set_item(pamh, PAM_OLDAUTHTOK, password);
209 if (flags & PAM_PRELIM_CHECK) {
210 /* only auth check was requested, so return success here */
213 if (!(flags & PAM_UPDATE_AUTHTOK)) {
214 /* these lines are never executed ... */
215 /* UPDATE_AUTHTOK flag is required, return with error */
216 pam_afs_syslog(LOG_ERR, PAMAFS_FLAGS, "PAM_UPDATE_AUTHTOK");
220 /* get the new passwd and verify it */
221 errcode = pam_afs_prompt(pam_convp, &new_password, 0, PAMAFS_NEW_PWD_PROMPT);
222 if (errcode != PAM_SUCCESS || new_password == NULL) {
223 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
226 if (new_password[0] == '\0') {
227 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
230 errcode = pam_afs_prompt(pam_convp, &verify_password, 0, PAMAFS_VERIFY_PWD_PROMPT);
231 if (errcode != PAM_SUCCESS || verify_password == NULL) {
232 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
233 memset(new_password, 0, strlen(new_password));
236 if (verify_password[0] == '\0') {
237 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
238 memset(new_password, 0, strlen(new_password));
241 if (strcmp(new_password, verify_password) != 0) {
242 pam_afs_syslog(LOG_INFO, PAMAFS_NE_PASSWORD);
243 memset(new_password, 0, strlen(new_password));
244 memset(verify_password, 0, strlen(verify_password));
247 memset(verify_password, 0, strlen(verify_password));
248 /* checking password length and quality is up to other PAM modules */
250 /* set the new password */
251 if ((code = ka_Init(0)) != 0) {
252 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
255 if ((code = rx_Init(0)) != 0) {
256 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
260 if ((localcell = ka_LocalCell()) == NULL) {
261 pam_afs_syslog(LOG_ERR, PAMAFS_NOCELLNAME);
264 strcpy(realm,localcell);
266 /* oldkey is not used in ka_ChangePassword (only for ka_auth) */
267 ka_StringToKey(password, realm, &oldkey);
268 ka_StringToKey(new_password, realm, &newkey);
269 if ((code = ka_GetAdminToken(user, instance, realm, &oldkey, 20, &token, 0)) != 0) {
270 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
273 if ((code = ka_AuthServerConn(realm, KA_MAINTENANCE_SERVICE, &token, &conn)) != 0) {
274 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
277 if ((code = ka_ChangePassword(user, /* kerberos name */
278 instance, /* instance */
280 0, /* old password unused */
281 &newkey /* new password */ )) != 0) {
282 pam_afs_syslog(LOG_ERR, PAMAFS_KAPASS_FAIL);
283 memset(new_password, 0, strlen(new_password));
286 pam_set_item(pamh, PAM_AUTHTOK, new_password);
291 if (password && torch_password) {
292 memset(password, 0, strlen(password));
294 (void) setlogmask(origmask);
295 #ifndef AFS_SUN56_ENV