/*
- * Copyright (c) 1999-2001 Todd C. Miller <Todd.Miller@courtesan.com>
- * All rights reserved.
+ * Copyright (c) 1999-2005, 2007-2010 Todd C. Miller <Todd.Miller@courtesan.com>
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
*
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * 4. Products derived from this software may not be called "Sudo" nor
- * may "Sudo" appear in their names without specific prior written
- * permission from the author.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
- * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
-#include "config.h"
+#include <config.h>
#include <sys/types.h>
#include <sys/param.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
-# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
-# include <memory.h>
-# endif
# include <string.h>
-#else
-# ifdef HAVE_STRINGS_H
-# include <strings.h>
-# endif
#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.h>
+#include <errno.h>
-#include <security/pam_appl.h>
+#ifdef HAVE_PAM_PAM_APPL_H
+# include <pam/pam_appl.h>
+#else
+# include <security/pam_appl.h>
+#endif
+
+#ifdef HAVE_DGETTEXT
+# include <libintl.h>
+# if defined(__LINUX_PAM__)
+# define PAM_TEXT_DOMAIN "Linux-PAM"
+# elif defined(__sun__)
+# define PAM_TEXT_DOMAIN "SUNW_OST_SYSOSPAM"
+# endif
+#endif
#include "sudo.h"
#include "sudo_auth.h"
-#ifndef lint
-static const char rcsid[] = "$Sudo: pam.c,v 1.29 2002/01/22 16:43:23 millert Exp $";
-#endif /* lint */
+/* Only OpenPAM and Linux PAM use const qualifiers. */
+#if defined(_OPENPAM) || defined(OPENPAM_VERSION) || \
+ defined(__LIBPAM_VERSION) || defined(__LINUX_PAM__)
+# define PAM_CONST const
+#else
+# define PAM_CONST
+#endif
static int sudo_conv __P((int, PAM_CONST struct pam_message **,
- struct pam_response **, VOID *));
-static char *def_prompt;
+ struct pam_response **, void *));
+static char *def_prompt = "Password:";
+static int gotintr;
#ifndef PAM_DATA_SILENT
#define PAM_DATA_SILENT 0
#endif
+static pam_handle_t *pamh; /* global due to pam_prep_user() */
+
int
pam_init(pw, promptp, auth)
struct passwd *pw;
sudo_auth *auth;
{
static struct pam_conv pam_conv;
- pam_handle_t *pamh;
+ static int pam_status;
/* Initial PAM setup */
+ if (auth != NULL)
+ auth->data = (void *) &pam_status;
pam_conv.conv = sudo_conv;
- if (pam_start("sudo", pw->pw_name, &pam_conv, &pamh) != PAM_SUCCESS) {
- log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
- "unable to initialize PAM");
- return(AUTH_FATAL);
+#ifdef HAVE_PAM_LOGIN
+ if (ISSET(sudo_mode, MODE_LOGIN_SHELL))
+ pam_status = pam_start("sudo-i", pw->pw_name, &pam_conv, &pamh);
+ else
+#endif
+ pam_status = pam_start("sudo", pw->pw_name, &pam_conv, &pamh);
+
+ if (pam_status != PAM_SUCCESS) {
+ log_error(USE_ERRNO|NO_EXIT|NO_MAIL, "unable to initialize PAM");
+ return AUTH_FATAL;
}
- if (strcmp(user_tty, "unknown"))
- (void) pam_set_item(pamh, PAM_TTY, user_tty);
- auth->data = (VOID *) pamh;
- return(AUTH_SUCCESS);
+ /*
+ * Set PAM_RUSER to the invoking user (the "from" user).
+ * We set PAM_RHOST to avoid a bug in Solaris 7 and below.
+ */
+ (void) pam_set_item(pamh, PAM_RUSER, user_name);
+#ifdef __sun__
+ (void) pam_set_item(pamh, PAM_RHOST, user_host);
+#endif
+
+ /*
+ * Some versions of pam_lastlog have a bug that
+ * will cause a crash if PAM_TTY is not set so if
+ * there is no tty, set PAM_TTY to the empty string.
+ */
+ if (user_ttypath == NULL)
+ (void) pam_set_item(pamh, PAM_TTY, "");
+ else
+ (void) pam_set_item(pamh, PAM_TTY, user_ttypath);
+
+ return AUTH_SUCCESS;
}
int
char *prompt;
sudo_auth *auth;
{
- int error;
const char *s;
- pam_handle_t *pamh = (pam_handle_t *) auth->data;
+ int *pam_status = (int *) auth->data;
def_prompt = prompt; /* for sudo_conv */
/* PAM_SILENT prevents the authentication service from generating output. */
- error = pam_authenticate(pamh, PAM_SILENT);
- switch (error) {
+ *pam_status = pam_authenticate(pamh, PAM_SILENT);
+ switch (*pam_status) {
case PAM_SUCCESS:
- return(AUTH_SUCCESS);
+ *pam_status = pam_acct_mgmt(pamh, PAM_SILENT);
+ switch (*pam_status) {
+ case PAM_SUCCESS:
+ return AUTH_SUCCESS;
+ case PAM_AUTH_ERR:
+ log_error(NO_EXIT|NO_MAIL,
+ "account validation failure, is your account locked?");
+ return AUTH_FATAL;
+ case PAM_NEW_AUTHTOK_REQD:
+ log_error(NO_EXIT|NO_MAIL, "%s, %s",
+ "Account or password is expired",
+ "reset your password and try again");
+ *pam_status = pam_chauthtok(pamh,
+ PAM_CHANGE_EXPIRED_AUTHTOK);
+ if (*pam_status == PAM_SUCCESS)
+ return AUTH_SUCCESS;
+ if ((s = pam_strerror(pamh, *pam_status)))
+ log_error(NO_EXIT|NO_MAIL, "pam_chauthtok: %s", s);
+ return AUTH_FAILURE;
+ case PAM_AUTHTOK_EXPIRED:
+ log_error(NO_EXIT|NO_MAIL,
+ "Password expired, contact your system administrator");
+ return AUTH_FATAL;
+ case PAM_ACCT_EXPIRED:
+ log_error(NO_EXIT|NO_MAIL, "%s %s",
+ "Account expired or PAM config lacks an \"account\"",
+ "section for sudo, contact your system administrator");
+ return AUTH_FATAL;
+ }
+ /* FALLTHROUGH */
case PAM_AUTH_ERR:
+ if (gotintr) {
+ /* error or ^C from tgetpass() */
+ return AUTH_INTR;
+ }
case PAM_MAXTRIES:
- return(AUTH_FAILURE);
+ case PAM_PERM_DENIED:
+ return AUTH_FAILURE;
default:
- if ((s = pam_strerror(pamh, error)))
+ if ((s = pam_strerror(pamh, *pam_status)))
log_error(NO_EXIT|NO_MAIL, "pam_authenticate: %s", s);
- return(AUTH_FATAL);
+ return AUTH_FATAL;
}
}
struct passwd *pw;
sudo_auth *auth;
{
- pam_handle_t *pamh = (pam_handle_t *) auth->data;
- int status = PAM_DATA_SILENT;
-
- /* Convert AUTH_FOO -> PAM_FOO as best we can. */
- /* XXX - store real value somewhere in auth->data and use it */
- switch (auth->status) {
- case AUTH_SUCCESS:
- status |= PAM_SUCCESS;
- break;
- case AUTH_FAILURE:
- status |= PAM_AUTH_ERR;
- break;
- case AUTH_FATAL:
- default:
- status |= PAM_ABORT;
- break;
- }
+ int *pam_status = (int *) auth->data;
- if (pam_end(pamh, status) == PAM_SUCCESS)
- return(AUTH_SUCCESS);
- else
- return(AUTH_FAILURE);
+ /* If successful, we can't close the session until pam_prep_user() */
+ if (auth->status == AUTH_SUCCESS)
+ return AUTH_SUCCESS;
+
+ *pam_status = pam_end(pamh, *pam_status | PAM_DATA_SILENT);
+ return *pam_status == PAM_SUCCESS ? AUTH_SUCCESS : AUTH_FAILURE;
}
int
-pam_prep_user(pw)
+pam_begin_session(pw)
struct passwd *pw;
{
- struct pam_conv pam_conv;
- pam_handle_t *pamh;
+ int status = PAM_SUCCESS;
- /* We need to setup a new PAM session for the user we are changing *to*. */
- pam_conv.conv = sudo_conv;
- if (pam_start("sudo", pw->pw_name, &pam_conv, &pamh) != PAM_SUCCESS) {
- log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
- "unable to initialize PAM");
- return(AUTH_FATAL);
- }
- (void) pam_set_item(pamh, PAM_RUSER, user_name);
- if (strcmp(user_tty, "unknown"))
- (void) pam_set_item(pamh, PAM_TTY, user_tty);
+ /* If the user did not have to authenticate there is no pam handle yet. */
+ if (pamh == NULL)
+ pam_init(pw, NULL, NULL);
+
+ /*
+ * Update PAM_USER to reference the user we are running the command
+ * as, as opposed to the user we authenticated as.
+ */
+ (void) pam_set_item(pamh, PAM_USER, pw->pw_name);
/*
* Set credentials (may include resource limits, device ownership, etc).
*/
(void) pam_setcred(pamh, PAM_ESTABLISH_CRED);
- if (pam_end(pamh, PAM_SUCCESS) == PAM_SUCCESS)
- return(PAM_SUCCESS);
- else
- return(AUTH_FAILURE);
+#ifndef NO_PAM_SESSION
+ status = pam_open_session(pamh, 0);
+ if (status != PAM_SUCCESS) {
+ (void) pam_end(pamh, status | PAM_DATA_SILENT);
+ pamh = NULL;
+ }
+#endif
+ return status == PAM_SUCCESS ? AUTH_SUCCESS : AUTH_FAILURE;
+}
+
+int
+pam_end_session()
+{
+ int status = PAM_SUCCESS;
+
+ if (pamh != NULL) {
+#ifndef NO_PAM_SESSION
+ (void) pam_close_session(pamh, 0);
+#endif
+ status = pam_end(pamh, PAM_SUCCESS | PAM_DATA_SILENT);
+ }
+ return status == PAM_SUCCESS ? AUTH_SUCCESS : AUTH_FAILURE;
}
/*
int num_msg;
PAM_CONST struct pam_message **msg;
struct pam_response **response;
- VOID *appdata_ptr;
+ void *appdata_ptr;
{
struct pam_response *pr;
PAM_CONST struct pam_message *pm;
- const char *p = def_prompt;
+ const char *prompt;
char *pass;
- int n;
- extern int nil_pw;
+ int n, flags, std_prompt;
if ((*response = malloc(num_msg * sizeof(struct pam_response))) == NULL)
- return(PAM_CONV_ERR);
- (void) memset(*response, 0, num_msg * sizeof(struct pam_response));
+ return PAM_SYSTEM_ERR;
+ zero_bytes(*response, num_msg * sizeof(struct pam_response));
for (pr = *response, pm = *msg, n = num_msg; n--; pr++, pm++) {
+ flags = tgetpass_flags;
switch (pm->msg_style) {
case PAM_PROMPT_ECHO_ON:
- tgetpass_flags |= TGP_ECHO;
+ SET(flags, TGP_ECHO);
case PAM_PROMPT_ECHO_OFF:
+ prompt = def_prompt;
+
+ /* Error out if the last password read was interrupted. */
+ if (gotintr)
+ goto err;
+
+ /* Is the sudo prompt standard? (If so, we'l just use PAM's) */
+ std_prompt = strncmp(def_prompt, "Password:", 9) == 0 &&
+ (def_prompt[9] == '\0' ||
+ (def_prompt[9] == ' ' && def_prompt[10] == '\0'));
+
/* Only override PAM prompt if it matches /^Password: ?/ */
- if (strncmp(pm->msg, "Password:", 9) || (pm->msg[9] != '\0'
- && (pm->msg[9] != ' ' || pm->msg[10] != '\0')))
- p = pm->msg;
- /* Read the password. */
- pass = tgetpass(p, def_ival(I_PASSWD_TIMEOUT) * 60,
- tgetpass_flags);
- pr->resp = estrdup(pass ? pass : "");
- if (*pr->resp == '\0')
- nil_pw = 1; /* empty password */
- else
- memset(pass, 0, strlen(pass));
+#if defined(PAM_TEXT_DOMAIN) && defined(HAVE_DGETTEXT)
+ if (!def_passprompt_override && (std_prompt ||
+ (strcmp(pm->msg, dgettext(PAM_TEXT_DOMAIN, "Password: ")) &&
+ strcmp(pm->msg, dgettext(PAM_TEXT_DOMAIN, "Password:")))))
+ prompt = pm->msg;
+#else
+ if (!def_passprompt_override && (std_prompt ||
+ strncmp(pm->msg, "Password:", 9) || (pm->msg[9] != '\0'
+ && (pm->msg[9] != ' ' || pm->msg[10] != '\0'))))
+ prompt = pm->msg;
+#endif
+ /* Read the password unless interrupted. */
+ pass = tgetpass(prompt, def_passwd_timeout * 60, flags);
+ if (pass == NULL) {
+ /* We got ^C instead of a password; abort quickly. */
+ if (errno == EINTR)
+ gotintr = 1;
+#if defined(__darwin__) || defined(__APPLE__)
+ pass = "";
+#else
+ goto err;
+#endif
+ }
+ pr->resp = estrdup(pass);
+ zero_bytes(pass, strlen(pass));
break;
case PAM_TEXT_INFO:
if (pm->msg)
}
break;
default:
- /* Zero and free allocated memory and return an error. */
- for (pr = *response, n = num_msg; n--; pr++) {
- if (pr->resp != NULL) {
- (void) memset(pr->resp, 0, strlen(pr->resp));
- free(pr->resp);
- pr->resp = NULL;
- }
- }
- (void) memset(*response, 0,
- num_msg * sizeof(struct pam_response));
- free(*response);
- *response = NULL;
- return(PAM_CONV_ERR);
+ goto err;
}
}
- return(PAM_SUCCESS);
+ return PAM_SUCCESS;
+
+err:
+ /* Zero and free allocated memory and return an error. */
+ for (pr = *response, n = num_msg; n--; pr++) {
+ if (pr->resp != NULL) {
+ zero_bytes(pr->resp, strlen(pr->resp));
+ free(pr->resp);
+ pr->resp = NULL;
+ }
+ }
+ zero_bytes(*response, num_msg * sizeof(struct pam_response));
+ free(*response);
+ *response = NULL;
+ return gotintr ? PAM_AUTH_ERR : PAM_CONV_ERR;
}
projects / debian / sudo / blobdiff