+++ /dev/null
-/*
- * Copyright (c) 1999-2005, 2007-2010 Todd C. Miller <Todd.Miller@courtesan.com>
- *
- * 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.
- *
- * 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.
- *
- * 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 <sys/types.h>
-#include <sys/param.h>
-#include <stdio.h>
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-# include <stddef.h>
-#else
-# ifdef HAVE_STDLIB_H
-# include <stdlib.h>
-# endif
-#endif /* STDC_HEADERS */
-#ifdef HAVE_STRING_H
-# include <string.h>
-#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>
-
-#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"
-
-/* 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 = "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;
- char **promptp;
- sudo_auth *auth;
-{
- static struct pam_conv pam_conv;
- static int pam_status;
-
- /* Initial PAM setup */
- if (auth != NULL)
- auth->data = (void *) &pam_status;
- pam_conv.conv = sudo_conv;
-#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);
- }
-
- /*
- * 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
-pam_verify(pw, prompt, auth)
- struct passwd *pw;
- char *prompt;
- sudo_auth *auth;
-{
- const char *s;
- int *pam_status = (int *) auth->data;
-
- def_prompt = prompt; /* for sudo_conv */
-
- /* PAM_SILENT prevents the authentication service from generating output. */
- *pam_status = pam_authenticate(pamh, PAM_SILENT);
- switch (*pam_status) {
- case PAM_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, "pam_acct_mgmt: %d",
- *pam_status);
- return(AUTH_FAILURE);
- 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:
- case PAM_PERM_DENIED:
- return(AUTH_FAILURE);
- default:
- if ((s = pam_strerror(pamh, *pam_status)))
- log_error(NO_EXIT|NO_MAIL, "pam_authenticate: %s", s);
- return(AUTH_FATAL);
- }
-}
-
-int
-pam_cleanup(pw, auth)
- struct passwd *pw;
- sudo_auth *auth;
-{
- int *pam_status = (int *) auth->data;
-
- /* 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_begin_session(pw)
- struct passwd *pw;
-{
- int status = PAM_SUCCESS;
-
- /* 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).
- * We don't check the return value here because in Linux-PAM 0.75
- * it returns the last saved return code, not the return code
- * for the setcred module. Because we haven't called pam_authenticate(),
- * this is not set and so pam_setcred() returns PAM_PERM_DENIED.
- * We can't call pam_acct_mgmt() with Linux-PAM for a similar reason.
- */
- (void) pam_setcred(pamh, PAM_ESTABLISH_CRED);
-
-#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);
-}
-
-/*
- * ``Conversation function'' for PAM.
- * XXX - does not handle PAM_BINARY_PROMPT
- */
-static int
-sudo_conv(num_msg, msg, response, appdata_ptr)
- int num_msg;
- PAM_CONST struct pam_message **msg;
- struct pam_response **response;
- void *appdata_ptr;
-{
- struct pam_response *pr;
- PAM_CONST struct pam_message *pm;
- const char *prompt;
- char *pass;
- int n, flags, std_prompt;
-
- if ((*response = malloc(num_msg * sizeof(struct pam_response))) == NULL)
- 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:
- 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 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)
- (void) puts(pm->msg);
- break;
- case PAM_ERROR_MSG:
- if (pm->msg) {
- (void) fputs(pm->msg, stderr);
- (void) fputc('\n', stderr);
- }
- break;
- default:
- goto err;
- }
- }
-
- 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