2 * Copyright (c) 1999-2005, 2007-2009 Todd C. Miller <Todd.Miller@courtesan.com>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 * Sponsored in part by the Defense Advanced Research Projects
17 * Agency (DARPA) and Air Force Research Laboratory, Air Force
18 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
23 #include <sys/types.h>
24 #include <sys/param.h>
33 #endif /* STDC_HEADERS */
35 # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
40 # ifdef HAVE_STRINGS_H
43 #endif /* HAVE_STRING_H */
46 #endif /* HAVE_UNISTD_H */
50 #ifdef HAVE_PAM_PAM_APPL_H
51 # include <pam/pam_appl.h>
53 # include <security/pam_appl.h>
58 # if defined(__LINUX_PAM__)
59 # define PAM_TEXT_DOMAIN "Linux-PAM"
60 # elif defined(__sun__)
61 # define PAM_TEXT_DOMAIN "SUNW_OST_SYSOSPAM"
66 #include "sudo_auth.h"
68 /* Only OpenPAM and Linux PAM use const qualifiers. */
69 #if defined(_OPENPAM) || defined(__LIBPAM_VERSION) || defined(__LINUX_PAM__)
70 # define PAM_CONST const
75 static int sudo_conv __P((int, PAM_CONST struct pam_message **,
76 struct pam_response **, void *));
77 static char *def_prompt = "Password:";
80 #ifndef PAM_DATA_SILENT
81 #define PAM_DATA_SILENT 0
84 static pam_handle_t *pamh; /* global due to pam_prep_user() */
87 pam_init(pw, promptp, auth)
92 static struct pam_conv pam_conv;
93 static int pam_status;
95 /* Initial PAM setup */
97 auth->data = (void *) &pam_status;
98 pam_conv.conv = sudo_conv;
99 pam_status = pam_start("sudo", pw->pw_name, &pam_conv, &pamh);
100 if (pam_status != PAM_SUCCESS) {
101 log_error(USE_ERRNO|NO_EXIT|NO_MAIL, "unable to initialize PAM");
106 * Set PAM_RUSER to the invoking user (the "from" user).
107 * We set PAM_RHOST to avoid a bug in Solaris 7 and below.
109 (void) pam_set_item(pamh, PAM_RUSER, user_name);
110 (void) pam_set_item(pamh, PAM_RHOST, user_host);
113 * Some versions of pam_lastlog have a bug that
114 * will cause a crash if PAM_TTY is not set so if
115 * there is no tty, set PAM_TTY to the empty string.
117 if (user_ttypath == NULL)
118 (void) pam_set_item(pamh, PAM_TTY, "");
120 (void) pam_set_item(pamh, PAM_TTY, user_ttypath);
122 return(AUTH_SUCCESS);
126 pam_verify(pw, prompt, auth)
132 int *pam_status = (int *) auth->data;
134 def_prompt = prompt; /* for sudo_conv */
136 /* PAM_SILENT prevents the authentication service from generating output. */
137 *pam_status = pam_authenticate(pamh, PAM_SILENT);
138 switch (*pam_status) {
140 *pam_status = pam_acct_mgmt(pamh, PAM_SILENT);
141 switch (*pam_status) {
143 return(AUTH_SUCCESS);
145 log_error(NO_EXIT|NO_MAIL, "pam_acct_mgmt: %d",
147 return(AUTH_FAILURE);
148 case PAM_NEW_AUTHTOK_REQD:
149 log_error(NO_EXIT|NO_MAIL, "%s, %s",
150 "Account or password is expired",
151 "reset your password and try again");
152 *pam_status = pam_chauthtok(pamh,
153 PAM_CHANGE_EXPIRED_AUTHTOK);
154 if (*pam_status == PAM_SUCCESS)
155 return(AUTH_SUCCESS);
156 if ((s = pam_strerror(pamh, *pam_status)))
157 log_error(NO_EXIT|NO_MAIL, "pam_chauthtok: %s", s);
158 return(AUTH_FAILURE);
159 case PAM_AUTHTOK_EXPIRED:
160 log_error(NO_EXIT|NO_MAIL,
161 "Password expired, contact your system administrator");
163 case PAM_ACCT_EXPIRED:
164 log_error(NO_EXIT|NO_MAIL, "%s %s",
165 "Account expired or PAM config lacks an \"account\"",
166 "section for sudo, contact your system administrator");
172 /* error or ^C from tgetpass() */
176 case PAM_PERM_DENIED:
177 return(AUTH_FAILURE);
179 if ((s = pam_strerror(pamh, *pam_status)))
180 log_error(NO_EXIT|NO_MAIL, "pam_authenticate: %s", s);
186 pam_cleanup(pw, auth)
190 int *pam_status = (int *) auth->data;
192 /* If successful, we can't close the session until pam_prep_user() */
193 if (auth->status == AUTH_SUCCESS)
194 return(AUTH_SUCCESS);
196 *pam_status = pam_end(pamh, *pam_status | PAM_DATA_SILENT);
197 return(*pam_status == PAM_SUCCESS ? AUTH_SUCCESS : AUTH_FAILURE);
207 pam_init(pw, NULL, NULL);
210 * Update PAM_USER to reference the user we are running the command
211 * as, as opposed to the user we authenticated as.
213 (void) pam_set_item(pamh, PAM_USER, pw->pw_name);
216 * Set credentials (may include resource limits, device ownership, etc).
217 * We don't check the return value here because in Linux-PAM 0.75
218 * it returns the last saved return code, not the return code
219 * for the setcred module. Because we haven't called pam_authenticate(),
220 * this is not set and so pam_setcred() returns PAM_PERM_DENIED.
221 * We can't call pam_acct_mgmt() with Linux-PAM for a similar reason.
223 (void) pam_setcred(pamh, PAM_ESTABLISH_CRED);
225 #ifndef NO_PAM_SESSION
227 * To fully utilize PAM sessions we would need to keep a
228 * sudo process around until the command exits. However, we
229 * can at least cause pam_limits to be run by opening and then
230 * immediately closing the session.
232 if ((eval = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
233 (void) pam_end(pamh, eval | PAM_DATA_SILENT);
234 return(AUTH_FAILURE);
236 (void) pam_close_session(pamh, 0);
239 if (pam_end(pamh, PAM_SUCCESS | PAM_DATA_SILENT) == PAM_SUCCESS)
240 return(AUTH_SUCCESS);
242 return(AUTH_FAILURE);
246 * ``Conversation function'' for PAM.
247 * XXX - does not handle PAM_BINARY_PROMPT
250 sudo_conv(num_msg, msg, response, appdata_ptr)
252 PAM_CONST struct pam_message **msg;
253 struct pam_response **response;
256 struct pam_response *pr;
257 PAM_CONST struct pam_message *pm;
260 int n, flags, std_prompt;
262 if ((*response = malloc(num_msg * sizeof(struct pam_response))) == NULL)
263 return(PAM_SYSTEM_ERR);
264 zero_bytes(*response, num_msg * sizeof(struct pam_response));
266 for (pr = *response, pm = *msg, n = num_msg; n--; pr++, pm++) {
267 flags = tgetpass_flags;
268 switch (pm->msg_style) {
269 case PAM_PROMPT_ECHO_ON:
270 SET(flags, TGP_ECHO);
271 case PAM_PROMPT_ECHO_OFF:
274 /* Is the sudo prompt standard? (If so, we'l just use PAM's) */
275 std_prompt = strncmp(def_prompt, "Password:", 9) == 0 &&
276 (def_prompt[9] == '\0' ||
277 (def_prompt[9] == ' ' && def_prompt[10] == '\0'));
279 /* Only override PAM prompt if it matches /^Password: ?/ */
280 #if defined(PAM_TEXT_DOMAIN) && defined(HAVE_DGETTEXT)
281 if (!def_passprompt_override && (std_prompt ||
282 (strcmp(pm->msg, dgettext(PAM_TEXT_DOMAIN, "Password: ")) &&
283 strcmp(pm->msg, dgettext(PAM_TEXT_DOMAIN, "Password:")))))
286 if (!def_passprompt_override && (std_prompt ||
287 strncmp(pm->msg, "Password:", 9) || (pm->msg[9] != '\0'
288 && (pm->msg[9] != ' ' || pm->msg[10] != '\0'))))
291 /* Read the password unless interrupted. */
292 pass = tgetpass(prompt, def_passwd_timeout * 60, flags);
294 /* We got ^C instead of a password; abort quickly. */
297 #if defined(__darwin__) || defined(__APPLE__)
303 pr->resp = estrdup(pass);
304 zero_bytes(pass, strlen(pass));
308 (void) puts(pm->msg);
312 (void) fputs(pm->msg, stderr);
313 (void) fputc('\n', stderr);
324 /* Zero and free allocated memory and return an error. */
325 for (pr = *response, n = num_msg; n--; pr++) {
326 if (pr->resp != NULL) {
327 zero_bytes(pr->resp, strlen(pr->resp));
332 zero_bytes(*response, num_msg * sizeof(struct pam_response));
335 return(gotintr ? PAM_AUTH_ERR : PAM_CONV_ERR);