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 <afsconfig.h>
18 #include <afs/param.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; }
40 int retcode = PAM_SUCCESS;
41 int errcode = PAM_SUCCESS;
44 int logmask = LOG_UPTO(LOG_INFO);
46 int use_first_pass = 0;
47 int try_first_pass = 0;
49 int got_authtok = 0; /* got PAM_AUTHTOK upon entry */
50 int torch_password = 1;
52 char my_password_buf[256];
57 char *user = NULL, *password = NULL;
58 char *new_password = NULL, *verify_password = NULL;
59 char upwd_buf[2048]; /* size is a guess. */
61 struct ktc_encryptionKey oldkey, newkey;
62 struct ktc_token token;
63 struct ubik_client *conn = 0;
64 struct pam_conv *pam_convp = NULL;
65 struct passwd unix_pwd, *upwd = NULL;
68 openlog(pam_afs_ident, LOG_CONS, LOG_AUTH);
70 origmask = setlogmask(logmask);
73 * Parse the user options. Log an error for any unknown options.
75 * Todo options: PAM_SILENT
77 for (i = 0; i < argc; i++) {
78 if ( strcasecmp(argv[i], "debug" ) == 0) {
79 logmask |= LOG_MASK(LOG_DEBUG);
80 (void) setlogmask(logmask);
81 } else if (strcasecmp(argv[i], "nowarn" ) == 0) {
83 } else if (strcasecmp(argv[i], "use_first_pass") == 0) {
85 } else if (strcasecmp(argv[i], "try_first_pass") == 0) {
87 } else if (strcasecmp(argv[i], "ignore_root" ) == 0) {
90 pam_afs_syslog(LOG_ERR, PAMAFS_UNKNOWNOPT, argv[i]);
94 if (use_first_pass) try_first_pass = 0;
96 if (logmask && LOG_MASK(LOG_DEBUG))
98 pam_afs_syslog(LOG_DEBUG, PAMAFS_OPTIONS, nowarn, use_first_pass, try_first_pass);
99 pam_afs_syslog(LOG_DEBUG, PAMAFS_PAMERROR, flags);
102 /* Try to get the user-interaction info, if available. */
103 errcode = pam_get_item(pamh, PAM_CONV, (const void **) &pam_convp);
104 if (errcode != PAM_SUCCESS) {
105 pam_afs_syslog(LOG_WARNING, PAMAFS_NO_USER_INT);
109 /* Who are we trying to authenticate here? */
110 if ((errcode = pam_get_user(pamh, (const char **)&user, "AFS username: ")) != PAM_SUCCESS) {
111 pam_afs_syslog(LOG_ERR, PAMAFS_NOUSER, errcode);
112 RET(PAM_USER_UNKNOWN);
115 if (logmask && LOG_MASK(LOG_DEBUG))
116 pam_afs_syslog(LOG_DEBUG, PAMAFS_USERNAMEDEBUG, user);
119 * If the user has a "local" (or via nss, possibly nss_dce) pwent,
120 * and its uid==0, and "ignore_root" was given in pam.conf,
123 #if defined(AFS_HPUX_ENV)
124 #if defined(AFS_HPUX110_ENV)
125 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf), &upwd);
126 #else /* AFS_HPUX110_ENV */
127 i = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
128 if ( i == 0 ) /* getpwnam_r success */
130 #endif /* else AFS_HPUX110_ENV */
131 if (ignore_root && i == 0 && upwd->pw_uid == 0) {
132 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
136 #if defined(AFS_LINUX20_ENV) || defined(AFS_FBSD_ENV)
137 upwd = getpwnam(user);
139 upwd = getpwnam_r(user, &unix_pwd, upwd_buf, sizeof(upwd_buf));
141 if (ignore_root && upwd != NULL && upwd->pw_uid == 0) {
142 pam_afs_syslog(LOG_INFO, PAMAFS_IGNORINGROOT, user);
147 errcode = pam_get_item(pamh, PAM_AUTHTOK, (const void **) &password);
148 if (errcode != PAM_SUCCESS || password == NULL) {
149 if (use_first_pass) {
150 pam_afs_syslog(LOG_ERR, PAMAFS_PASSWD_REQ, user);
153 password = NULL; /* In case it isn't already NULL */
154 if (logmask && LOG_MASK(LOG_DEBUG))
155 pam_afs_syslog(LOG_DEBUG, PAMAFS_NOFIRSTPASS, user);
156 } else if (password[0] == '\0') {
157 /* Actually we *did* get one but it was empty. */
159 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
160 RET(PAM_NEW_AUTHTOK_REQD);
162 if (logmask && LOG_MASK(LOG_DEBUG))
163 pam_afs_syslog(LOG_DEBUG, PAMAFS_GOTPASS, user);
167 if (!(use_first_pass || try_first_pass)) {
171 if (password == NULL) {
174 RET(PAM_AUTH_ERR); /* shouldn't happen */
177 if (pam_convp == NULL || pam_convp->conv == NULL) {
178 pam_afs_syslog(LOG_ERR, PAMAFS_CANNOT_PROMPT);
182 errcode = pam_afs_prompt(pam_convp, &password, 0, PAMAFS_PWD_PROMPT);
183 if (errcode != PAM_SUCCESS || password == NULL) {
184 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
187 if (password[0] == '\0') {
188 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
189 RET(PAM_NEW_AUTHTOK_REQD);
193 * We aren't going to free the password later (we will wipe it,
194 * though), because the storage for it if we get it from other
195 * paths may belong to someone else. Since we do need to free
196 * this storage, copy it to a buffer that won't need to be freed
197 * later, and free this storage now.
199 strncpy(my_password_buf, password, sizeof(my_password_buf));
200 my_password_buf[sizeof(my_password_buf)-1] = '\0';
201 memset(password, 0, strlen(password));
203 password = my_password_buf;
206 if ( (code = ka_VerifyUserPassword(KA_USERAUTH_VERSION + KA_USERAUTH_DOSETPAG,
207 user, /* kerberos name */
210 password, /* password */
212 &reason /* error string */ )) !=0 ) {
213 pam_afs_syslog(LOG_ERR, PAMAFS_LOGIN_FAILED, user, reason);
217 pam_set_item(pamh, PAM_AUTHTOK, password);
218 pam_set_item(pamh, PAM_OLDAUTHTOK, password);
219 if (flags & PAM_PRELIM_CHECK) {
220 /* only auth check was requested, so return success here */
223 if (!(flags & PAM_UPDATE_AUTHTOK)) {
224 /* these lines are never executed ... */
225 /* UPDATE_AUTHTOK flag is required, return with error */
226 pam_afs_syslog(LOG_ERR, PAMAFS_FLAGS, "PAM_UPDATE_AUTHTOK");
230 /* get the new passwd and verify it */
231 errcode = pam_afs_prompt(pam_convp, &new_password, 0, PAMAFS_NEW_PWD_PROMPT);
232 if (errcode != PAM_SUCCESS || new_password == NULL) {
233 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
236 if (new_password[0] == '\0') {
237 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
240 errcode = pam_afs_prompt(pam_convp, &verify_password, 0, PAMAFS_VERIFY_PWD_PROMPT);
241 if (errcode != PAM_SUCCESS || verify_password == NULL) {
242 pam_afs_syslog(LOG_ERR, PAMAFS_GETPASS_FAILED);
243 memset(new_password, 0, strlen(new_password));
246 if (verify_password[0] == '\0') {
247 pam_afs_syslog(LOG_INFO, PAMAFS_NILPASSWORD, user);
248 memset(new_password, 0, strlen(new_password));
251 if (strcmp(new_password, verify_password) != 0) {
252 pam_afs_syslog(LOG_INFO, PAMAFS_NE_PASSWORD);
253 memset(new_password, 0, strlen(new_password));
254 memset(verify_password, 0, strlen(verify_password));
257 memset(verify_password, 0, strlen(verify_password));
258 /* checking password length and quality is up to other PAM modules */
260 /* set the new password */
261 if ((code = ka_Init(0)) != 0) {
262 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
265 if ((code = rx_Init(0)) != 0) {
266 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
270 if ((localcell = ka_LocalCell()) == NULL) {
271 pam_afs_syslog(LOG_ERR, PAMAFS_NOCELLNAME);
274 strcpy(realm,localcell);
276 /* oldkey is not used in ka_ChangePassword (only for ka_auth) */
277 ka_StringToKey(password, realm, &oldkey);
278 ka_StringToKey(new_password, realm, &newkey);
279 if ((code = ka_GetAdminToken(user, instance, realm, &oldkey, 20, &token, 0)) != 0) {
280 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
283 if ((code = ka_AuthServerConn(realm, KA_MAINTENANCE_SERVICE, &token, &conn)) != 0) {
284 pam_afs_syslog(LOG_ERR, PAMAFS_KAERROR, code);
287 if ((code = ka_ChangePassword(user, /* kerberos name */
288 instance, /* instance */
290 0, /* old password unused */
291 &newkey /* new password */ )) != 0) {
292 pam_afs_syslog(LOG_ERR, PAMAFS_KAPASS_FAIL);
293 memset(new_password, 0, strlen(new_password));
296 pam_set_item(pamh, PAM_AUTHTOK, new_password);
301 if (password && torch_password) {
302 memset(password, 0, strlen(password));
304 (void) setlogmask(origmask);
305 #ifndef AFS_SUN56_ENV