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a5c9cd31 | 1 | /* |
09564242 | 2 | * Copyright (c) 2000 Damien Miller. All rights reserved. |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
09564242 | 12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
a5c9cd31 | 23 | */ |
24 | ||
25 | #include "includes.h" | |
26 | ||
27 | #ifdef USE_PAM | |
a5c9cd31 | 28 | #include "xmalloc.h" |
42f11eb2 | 29 | #include "log.h" |
fde58bd4 | 30 | #include "auth.h" |
277f55cf | 31 | #include "auth-options.h" |
5c377b3b | 32 | #include "auth-pam.h" |
a5c9cd31 | 33 | #include "servconf.h" |
42f11eb2 | 34 | #include "canohost.h" |
35 | #include "readpass.h" | |
a5c9cd31 | 36 | |
1ddee76b | 37 | extern char *__progname; |
38 | ||
277f55cf | 39 | extern int use_privsep; |
40 | ||
a5c9cd31 | 41 | RCSID("$Id$"); |
42 | ||
5daf7064 | 43 | #define NEW_AUTHTOK_MSG \ |
b992432e | 44 | "Warning: Your password has expired, please change it now." |
277f55cf | 45 | #define NEW_AUTHTOK_MSG_PRIVSEP \ |
46 | "Your password has expired, the session cannot proceed." | |
5daf7064 | 47 | |
5c377b3b | 48 | static int do_pam_conversation(int num_msg, const struct pam_message **msg, |
49 | struct pam_response **resp, void *appdata_ptr); | |
a5c9cd31 | 50 | |
51 | /* module-local variables */ | |
52 | static struct pam_conv conv = { | |
f7808a93 | 53 | (int (*)())do_pam_conversation, |
a5c9cd31 | 54 | NULL |
55 | }; | |
e11aab29 | 56 | static char *__pam_msg = NULL; |
57 | static pam_handle_t *__pamh = NULL; | |
58 | static const char *__pampasswd = NULL; | |
a5c9cd31 | 59 | |
5c377b3b | 60 | /* states for do_pam_conversation() */ |
8c9fe09e | 61 | enum { INITIAL_LOGIN, OTHER } pamstate = INITIAL_LOGIN; |
b992432e | 62 | /* remember whether pam_acct_mgmt() returned PAM_NEW_AUTHTOK_REQD */ |
ad55cd03 | 63 | static int password_change_required = 0; |
8c9fe09e | 64 | /* remember whether the last pam_authenticate() succeeded or not */ |
65 | static int was_authenticated = 0; | |
66 | ||
e11aab29 | 67 | /* Remember what has been initialised */ |
68 | static int session_opened = 0; | |
69 | static int creds_set = 0; | |
70 | ||
8c9fe09e | 71 | /* accessor which allows us to switch conversation structs according to |
72 | * the authentication method being used */ | |
e11aab29 | 73 | void do_pam_set_conv(struct pam_conv *conv) |
8c9fe09e | 74 | { |
e11aab29 | 75 | pam_set_item(__pamh, PAM_CONV, conv); |
8c9fe09e | 76 | } |
77 | ||
78 | /* start an authentication run */ | |
79 | int do_pam_authenticate(int flags) | |
80 | { | |
e11aab29 | 81 | int retval = pam_authenticate(__pamh, flags); |
8c9fe09e | 82 | was_authenticated = (retval == PAM_SUCCESS); |
83 | return retval; | |
84 | } | |
ad55cd03 | 85 | |
86 | /* | |
87 | * PAM conversation function. | |
88 | * There are two states this can run in. | |
89 | * | |
90 | * INITIAL_LOGIN mode simply feeds the password from the client into | |
91 | * PAM in response to PAM_PROMPT_ECHO_OFF, and collects output | |
e11aab29 | 92 | * messages with into __pam_msg. This is used during initial |
ad55cd03 | 93 | * authentication to bypass the normal PAM password prompt. |
94 | * | |
9678565b | 95 | * OTHER mode handles PAM_PROMPT_ECHO_OFF with read_passphrase() |
ad55cd03 | 96 | * and outputs messages to stderr. This mode is used if pam_chauthtok() |
97 | * is called to update expired passwords. | |
98 | */ | |
5c377b3b | 99 | static int do_pam_conversation(int num_msg, const struct pam_message **msg, |
a5c9cd31 | 100 | struct pam_response **resp, void *appdata_ptr) |
101 | { | |
102 | struct pam_response *reply; | |
103 | int count; | |
ad55cd03 | 104 | char buf[1024]; |
a5c9cd31 | 105 | |
106 | /* PAM will free this later */ | |
b2f295dc | 107 | reply = xmalloc(num_msg * sizeof(*reply)); |
a5c9cd31 | 108 | |
ad55cd03 | 109 | for (count = 0; count < num_msg; count++) { |
5c377b3b | 110 | if (pamstate == INITIAL_LOGIN) { |
111 | /* | |
112 | * We can't use stdio yet, queue messages for | |
113 | * printing later | |
114 | */ | |
115 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { | |
ad55cd03 | 116 | case PAM_PROMPT_ECHO_ON: |
b2f295dc | 117 | xfree(reply); |
5c377b3b | 118 | return PAM_CONV_ERR; |
119 | case PAM_PROMPT_ECHO_OFF: | |
e11aab29 | 120 | if (__pampasswd == NULL) { |
b2f295dc | 121 | xfree(reply); |
71dfaf1c | 122 | return PAM_CONV_ERR; |
71dfaf1c | 123 | } |
e11aab29 | 124 | reply[count].resp = xstrdup(__pampasswd); |
a5c9cd31 | 125 | reply[count].resp_retcode = PAM_SUCCESS; |
a5c9cd31 | 126 | break; |
ad55cd03 | 127 | case PAM_ERROR_MSG: |
a5c9cd31 | 128 | case PAM_TEXT_INFO: |
b2f295dc | 129 | if (PAM_MSG_MEMBER(msg, count, msg) != NULL) { |
e11aab29 | 130 | message_cat(&__pam_msg, |
5c377b3b | 131 | PAM_MSG_MEMBER(msg, count, msg)); |
ad55cd03 | 132 | } |
a5c9cd31 | 133 | reply[count].resp = xstrdup(""); |
ad55cd03 | 134 | reply[count].resp_retcode = PAM_SUCCESS; |
a5c9cd31 | 135 | break; |
a5c9cd31 | 136 | default: |
b2f295dc | 137 | xfree(reply); |
a5c9cd31 | 138 | return PAM_CONV_ERR; |
5c377b3b | 139 | } |
140 | } else { | |
141 | /* | |
142 | * stdio is connected, so interact directly | |
143 | */ | |
144 | switch(PAM_MSG_MEMBER(msg, count, msg_style)) { | |
145 | case PAM_PROMPT_ECHO_ON: | |
146 | fputs(PAM_MSG_MEMBER(msg, count, msg), stderr); | |
147 | fgets(buf, sizeof(buf), stdin); | |
148 | reply[count].resp = xstrdup(buf); | |
149 | reply[count].resp_retcode = PAM_SUCCESS; | |
150 | break; | |
151 | case PAM_PROMPT_ECHO_OFF: | |
9678565b | 152 | reply[count].resp = |
840ad55e | 153 | read_passphrase(PAM_MSG_MEMBER(msg, count, |
154 | msg), RP_ALLOW_STDIN); | |
5c377b3b | 155 | reply[count].resp_retcode = PAM_SUCCESS; |
156 | break; | |
157 | case PAM_ERROR_MSG: | |
158 | case PAM_TEXT_INFO: | |
d228d9dd | 159 | if (PAM_MSG_MEMBER(msg, count, msg) != NULL) |
5c377b3b | 160 | fprintf(stderr, "%s\n", |
161 | PAM_MSG_MEMBER(msg, count, msg)); | |
162 | reply[count].resp = xstrdup(""); | |
163 | reply[count].resp_retcode = PAM_SUCCESS; | |
164 | break; | |
165 | default: | |
b2f295dc | 166 | xfree(reply); |
5c377b3b | 167 | return PAM_CONV_ERR; |
168 | } | |
a5c9cd31 | 169 | } |
170 | } | |
171 | ||
172 | *resp = reply; | |
173 | ||
174 | return PAM_SUCCESS; | |
175 | } | |
176 | ||
177 | /* Called at exit to cleanly shutdown PAM */ | |
e11aab29 | 178 | void do_pam_cleanup_proc(void *context) |
a5c9cd31 | 179 | { |
37eadb90 | 180 | int pam_retval = PAM_SUCCESS; |
a5c9cd31 | 181 | |
e11aab29 | 182 | if (__pamh && session_opened) { |
183 | pam_retval = pam_close_session(__pamh, 0); | |
5c377b3b | 184 | if (pam_retval != PAM_SUCCESS) |
2b87da3b | 185 | log("Cannot close PAM session[%d]: %.200s", |
e11aab29 | 186 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
1c2d0a13 | 187 | } |
a5c9cd31 | 188 | |
e11aab29 | 189 | if (__pamh && creds_set) { |
190 | pam_retval = pam_setcred(__pamh, PAM_DELETE_CRED); | |
5c377b3b | 191 | if (pam_retval != PAM_SUCCESS) |
192 | debug("Cannot delete credentials[%d]: %.200s", | |
e11aab29 | 193 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
1c2d0a13 | 194 | } |
a5c9cd31 | 195 | |
e11aab29 | 196 | if (__pamh) { |
197 | pam_retval = pam_end(__pamh, pam_retval); | |
5c377b3b | 198 | if (pam_retval != PAM_SUCCESS) |
2b87da3b | 199 | log("Cannot release PAM authentication[%d]: %.200s", |
e11aab29 | 200 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
a5c9cd31 | 201 | } |
202 | } | |
203 | ||
204 | /* Attempt password authentation using PAM */ | |
fde58bd4 | 205 | int auth_pam_password(Authctxt *authctxt, const char *password) |
a5c9cd31 | 206 | { |
207 | extern ServerOptions options; | |
208 | int pam_retval; | |
fde58bd4 | 209 | struct passwd *pw = authctxt->pw; |
a5c9cd31 | 210 | |
e11aab29 | 211 | do_pam_set_conv(&conv); |
8c9fe09e | 212 | |
a5c9cd31 | 213 | /* deny if no user. */ |
214 | if (pw == NULL) | |
215 | return 0; | |
3cc990d7 | 216 | if (pw->pw_uid == 0 && options.permit_root_login == PERMIT_NO_PASSWD) |
a5c9cd31 | 217 | return 0; |
218 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
219 | return 0; | |
220 | ||
e11aab29 | 221 | __pampasswd = password; |
2b87da3b | 222 | |
ad55cd03 | 223 | pamstate = INITIAL_LOGIN; |
78afd1dc | 224 | pam_retval = do_pam_authenticate( |
225 | options.permit_empty_passwd == 0 ? PAM_DISALLOW_NULL_AUTHTOK : 0); | |
a5c9cd31 | 226 | if (pam_retval == PAM_SUCCESS) { |
5c377b3b | 227 | debug("PAM Password authentication accepted for " |
228 | "user \"%.100s\"", pw->pw_name); | |
a5c9cd31 | 229 | return 1; |
230 | } else { | |
5c377b3b | 231 | debug("PAM Password authentication for \"%.100s\" " |
232 | "failed[%d]: %s", pw->pw_name, pam_retval, | |
e11aab29 | 233 | PAM_STRERROR(__pamh, pam_retval)); |
a5c9cd31 | 234 | return 0; |
235 | } | |
236 | } | |
237 | ||
238 | /* Do account management using PAM */ | |
239 | int do_pam_account(char *username, char *remote_user) | |
240 | { | |
241 | int pam_retval; | |
2b87da3b | 242 | |
e11aab29 | 243 | do_pam_set_conv(&conv); |
5c377b3b | 244 | |
5c377b3b | 245 | if (remote_user) { |
a5c9cd31 | 246 | debug("PAM setting ruser to \"%.200s\"", remote_user); |
e11aab29 | 247 | pam_retval = pam_set_item(__pamh, PAM_RUSER, remote_user); |
5c377b3b | 248 | if (pam_retval != PAM_SUCCESS) |
249 | fatal("PAM set ruser failed[%d]: %.200s", pam_retval, | |
e11aab29 | 250 | PAM_STRERROR(__pamh, pam_retval)); |
a5c9cd31 | 251 | } |
252 | ||
e11aab29 | 253 | pam_retval = pam_acct_mgmt(__pamh, 0); |
ad200abb | 254 | debug2("pam_acct_mgmt() = %d", pam_retval); |
5daf7064 | 255 | switch (pam_retval) { |
256 | case PAM_SUCCESS: | |
257 | /* This is what we want */ | |
258 | break; | |
e108cd93 | 259 | #if 0 |
5daf7064 | 260 | case PAM_NEW_AUTHTOK_REQD: |
277f55cf | 261 | message_cat(&__pam_msg, use_privsep ? |
262 | NEW_AUTHTOK_MSG_PRIVSEP : NEW_AUTHTOK_MSG); | |
ad55cd03 | 263 | /* flag that password change is necessary */ |
264 | password_change_required = 1; | |
277f55cf | 265 | /* disallow other functionality for now */ |
266 | no_port_forwarding_flag |= 2; | |
267 | no_agent_forwarding_flag |= 2; | |
268 | no_x11_forwarding_flag |= 2; | |
5daf7064 | 269 | break; |
e108cd93 | 270 | #endif |
5daf7064 | 271 | default: |
5c377b3b | 272 | log("PAM rejected by account configuration[%d]: " |
e11aab29 | 273 | "%.200s", pam_retval, PAM_STRERROR(__pamh, |
5c377b3b | 274 | pam_retval)); |
5daf7064 | 275 | return(0); |
a5c9cd31 | 276 | } |
2b87da3b | 277 | |
a5c9cd31 | 278 | return(1); |
279 | } | |
280 | ||
281 | /* Do PAM-specific session initialisation */ | |
fd094f49 | 282 | void do_pam_session(char *username, const char *ttyname) |
a5c9cd31 | 283 | { |
284 | int pam_retval; | |
285 | ||
5f404be3 | 286 | do_pam_set_conv(&conv); |
287 | ||
a5c9cd31 | 288 | if (ttyname != NULL) { |
289 | debug("PAM setting tty to \"%.200s\"", ttyname); | |
e11aab29 | 290 | pam_retval = pam_set_item(__pamh, PAM_TTY, ttyname); |
5c377b3b | 291 | if (pam_retval != PAM_SUCCESS) |
2b87da3b | 292 | fatal("PAM set tty failed[%d]: %.200s", |
e11aab29 | 293 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
a5c9cd31 | 294 | } |
295 | ||
e11aab29 | 296 | pam_retval = pam_open_session(__pamh, 0); |
5c377b3b | 297 | if (pam_retval != PAM_SUCCESS) |
2b87da3b | 298 | fatal("PAM session setup failed[%d]: %.200s", |
e11aab29 | 299 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
40a35ff1 | 300 | |
1c2d0a13 | 301 | session_opened = 1; |
a5c9cd31 | 302 | } |
303 | ||
2b87da3b | 304 | /* Set PAM credentials */ |
9afbfcfa | 305 | void do_pam_setcred(int init) |
a5c9cd31 | 306 | { |
307 | int pam_retval; | |
2b87da3b | 308 | |
39ce53de | 309 | if (__pamh == NULL) |
310 | return; | |
311 | ||
5f404be3 | 312 | do_pam_set_conv(&conv); |
313 | ||
a5c9cd31 | 314 | debug("PAM establishing creds"); |
9afbfcfa | 315 | pam_retval = pam_setcred(__pamh, |
316 | init ? PAM_ESTABLISH_CRED : PAM_REINITIALIZE_CRED); | |
5daf7064 | 317 | if (pam_retval != PAM_SUCCESS) { |
5c377b3b | 318 | if (was_authenticated) |
2b87da3b | 319 | fatal("PAM setcred failed[%d]: %.200s", |
e11aab29 | 320 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
5c377b3b | 321 | else |
2b87da3b | 322 | debug("PAM setcred failed[%d]: %.200s", |
e11aab29 | 323 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
1c2d0a13 | 324 | } else |
325 | creds_set = 1; | |
ad55cd03 | 326 | } |
327 | ||
2919e060 | 328 | /* accessor function for file scope static variable */ |
e11aab29 | 329 | int is_pam_password_change_required(void) |
2919e060 | 330 | { |
331 | return password_change_required; | |
332 | } | |
333 | ||
2b87da3b | 334 | /* |
ad55cd03 | 335 | * Have user change authentication token if pam_acct_mgmt() indicated |
336 | * it was expired. This needs to be called after an interactive | |
337 | * session is established and the user's pty is connected to | |
b992432e | 338 | * stdin/stdout/stderr. |
ad55cd03 | 339 | */ |
a815d7a3 | 340 | void do_pam_chauthtok(void) |
ad55cd03 | 341 | { |
342 | int pam_retval; | |
343 | ||
5f404be3 | 344 | do_pam_set_conv(&conv); |
345 | ||
ad55cd03 | 346 | if (password_change_required) { |
277f55cf | 347 | if (use_privsep) |
348 | fatal("Password changing is currently unsupported" | |
349 | " with privilege separation"); | |
ad55cd03 | 350 | pamstate = OTHER; |
0a3700ee | 351 | pam_retval = pam_chauthtok(__pamh, PAM_CHANGE_EXPIRED_AUTHTOK); |
352 | if (pam_retval != PAM_SUCCESS) | |
353 | fatal("PAM pam_chauthtok failed[%d]: %.200s", | |
354 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); | |
277f55cf | 355 | #if 0 |
356 | /* XXX: This would need to be done in the parent process, | |
357 | * but there's currently no way to pass such request. */ | |
358 | no_port_forwarding_flag &= ~2; | |
359 | no_agent_forwarding_flag &= ~2; | |
360 | no_x11_forwarding_flag &= ~2; | |
361 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) | |
362 | channel_permit_all_opens(); | |
363 | #endif | |
5daf7064 | 364 | } |
a5c9cd31 | 365 | } |
366 | ||
367 | /* Cleanly shutdown PAM */ | |
368 | void finish_pam(void) | |
369 | { | |
e11aab29 | 370 | do_pam_cleanup_proc(NULL); |
371 | fatal_remove_cleanup(&do_pam_cleanup_proc, NULL); | |
a5c9cd31 | 372 | } |
373 | ||
374 | /* Start PAM authentication for specified account */ | |
04fc7a67 | 375 | void start_pam(const char *user) |
a5c9cd31 | 376 | { |
377 | int pam_retval; | |
dbd97a4d | 378 | extern ServerOptions options; |
46c76c63 | 379 | extern u_int utmp_len; |
380 | const char *rhost; | |
a5c9cd31 | 381 | |
04fc7a67 | 382 | debug("Starting up PAM with username \"%.200s\"", user); |
a5c9cd31 | 383 | |
e11aab29 | 384 | pam_retval = pam_start(SSHD_PAM_SERVICE, user, &conv, &__pamh); |
a5c9cd31 | 385 | |
5c377b3b | 386 | if (pam_retval != PAM_SUCCESS) |
2b87da3b | 387 | fatal("PAM initialisation failed[%d]: %.200s", |
e11aab29 | 388 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
e275684f | 389 | |
983784a1 | 390 | rhost = get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping); |
46c76c63 | 391 | debug("PAM setting rhost to \"%.200s\"", rhost); |
392 | ||
393 | pam_retval = pam_set_item(__pamh, PAM_RHOST, rhost); | |
e275684f | 394 | if (pam_retval != PAM_SUCCESS) |
395 | fatal("PAM set rhost failed[%d]: %.200s", pam_retval, | |
e11aab29 | 396 | PAM_STRERROR(__pamh, pam_retval)); |
a8545c6c | 397 | #ifdef PAM_TTY_KLUDGE |
ae543aaa | 398 | /* |
399 | * Some PAM modules (e.g. pam_time) require a TTY to operate, | |
2b87da3b | 400 | * and will fail in various stupid ways if they don't get one. |
ae543aaa | 401 | * sshd doesn't set the tty until too late in the auth process and may |
402 | * not even need one (for tty-less connections) | |
2b87da3b | 403 | * Kludge: Set a fake PAM_TTY |
ae543aaa | 404 | */ |
9f214051 | 405 | pam_retval = pam_set_item(__pamh, PAM_TTY, "NODEVssh"); |
5c377b3b | 406 | if (pam_retval != PAM_SUCCESS) |
2b87da3b | 407 | fatal("PAM set tty failed[%d]: %.200s", |
e11aab29 | 408 | pam_retval, PAM_STRERROR(__pamh, pam_retval)); |
a8545c6c | 409 | #endif /* PAM_TTY_KLUDGE */ |
cbd7492e | 410 | |
e11aab29 | 411 | fatal_add_cleanup(&do_pam_cleanup_proc, NULL); |
a5c9cd31 | 412 | } |
413 | ||
1d3f4ae7 | 414 | /* Return list of PAM environment strings */ |
a5c9cd31 | 415 | char **fetch_pam_environment(void) |
416 | { | |
2b763e31 | 417 | #ifdef HAVE_PAM_GETENVLIST |
e11aab29 | 418 | return(pam_getenvlist(__pamh)); |
2b763e31 | 419 | #else /* HAVE_PAM_GETENVLIST */ |
420 | return(NULL); | |
421 | #endif /* HAVE_PAM_GETENVLIST */ | |
a5c9cd31 | 422 | } |
423 | ||
ee48c949 | 424 | void free_pam_environment(char **env) |
425 | { | |
426 | int i; | |
427 | ||
428 | if (env != NULL) { | |
429 | for (i = 0; env[i] != NULL; i++) | |
430 | xfree(env[i]); | |
431 | } | |
432 | } | |
433 | ||
a5c9cd31 | 434 | /* Print any messages that have been generated during authentication */ |
435 | /* or account checking to stderr */ | |
436 | void print_pam_messages(void) | |
437 | { | |
e11aab29 | 438 | if (__pam_msg != NULL) |
439 | fputs(__pam_msg, stderr); | |
5daf7064 | 440 | } |
441 | ||
5c377b3b | 442 | /* Append a message to buffer */ |
443 | void message_cat(char **p, const char *a) | |
5daf7064 | 444 | { |
5c377b3b | 445 | char *cp; |
446 | size_t new_len; | |
2b87da3b | 447 | |
5c377b3b | 448 | new_len = strlen(a); |
2b87da3b | 449 | |
5c377b3b | 450 | if (*p) { |
451 | size_t len = strlen(*p); | |
452 | ||
453 | *p = xrealloc(*p, new_len + len + 2); | |
454 | cp = *p + len; | |
455 | } else | |
456 | *p = cp = xmalloc(new_len + 2); | |
5daf7064 | 457 | |
5c377b3b | 458 | memcpy(cp, a, new_len); |
459 | cp[new_len] = '\n'; | |
460 | cp[new_len + 1] = '\0'; | |
a5c9cd31 | 461 | } |
462 | ||
463 | #endif /* USE_PAM */ |