262 lines
7.2 KiB
C
262 lines
7.2 KiB
C
/*
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* Copyright (c) 1999-2001 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* 4. Products derived from this software may not be called "Sudo" nor
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* may "Sudo" appear in their names without specific prior written
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* permission from the author.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
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# include <memory.h>
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# endif
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# include <string.h>
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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <pwd.h>
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#include <security/pam_appl.h>
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#include "sudo.h"
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#include "sudo_auth.h"
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#ifndef lint
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static const char rcsid[] = "$Sudo$";
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#endif /* lint */
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static int sudo_conv __P((int, PAM_CONST struct pam_message **,
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struct pam_response **, VOID *));
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static char *def_prompt;
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#ifndef PAM_DATA_SILENT
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#define PAM_DATA_SILENT 0
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#endif
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int
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pam_init(pw, promptp, auth)
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struct passwd *pw;
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char **promptp;
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sudo_auth *auth;
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{
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static struct pam_conv pam_conv;
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pam_handle_t *pamh;
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/* Initial PAM setup */
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pam_conv.conv = sudo_conv;
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if (pam_start("sudo", pw->pw_name, &pam_conv, &pamh) != PAM_SUCCESS) {
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log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
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"unable to initialize PAM");
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return(AUTH_FATAL);
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}
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if (strcmp(user_tty, "unknown"))
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(void) pam_set_item(pamh, PAM_TTY, user_tty);
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auth->data = (VOID *) pamh;
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return(AUTH_SUCCESS);
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}
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int
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pam_verify(pw, prompt, auth)
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struct passwd *pw;
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char *prompt;
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sudo_auth *auth;
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{
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int error;
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const char *s;
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pam_handle_t *pamh = (pam_handle_t *) auth->data;
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def_prompt = prompt; /* for sudo_conv */
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/* PAM_SILENT prevents the authentication service from generating output. */
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error = pam_authenticate(pamh, PAM_SILENT);
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switch (error) {
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case PAM_SUCCESS:
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return(AUTH_SUCCESS);
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case PAM_AUTH_ERR:
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case PAM_MAXTRIES:
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return(AUTH_FAILURE);
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default:
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if ((s = pam_strerror(pamh, error)))
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log_error(NO_EXIT|NO_MAIL, "pam_authenticate: %s", s);
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return(AUTH_FATAL);
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}
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}
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int
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pam_cleanup(pw, auth)
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struct passwd *pw;
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sudo_auth *auth;
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{
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pam_handle_t *pamh = (pam_handle_t *) auth->data;
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int status = PAM_DATA_SILENT;
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/* Convert AUTH_FOO -> PAM_FOO as best we can. */
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/* XXX - store real value somewhere in auth->data and use it */
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switch (auth->status) {
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case AUTH_SUCCESS:
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status |= PAM_SUCCESS;
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break;
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case AUTH_FAILURE:
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status |= PAM_AUTH_ERR;
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break;
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case AUTH_FATAL:
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default:
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status |= PAM_ABORT;
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break;
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}
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if (pam_end(pamh, status) == PAM_SUCCESS)
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return(AUTH_SUCCESS);
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else
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return(AUTH_FAILURE);
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}
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int
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pam_prep_user(pw)
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struct passwd *pw;
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{
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struct pam_conv pam_conv;
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pam_handle_t *pamh;
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/* We need to setup a new PAM session for the user we are changing *to*. */
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pam_conv.conv = sudo_conv;
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if (pam_start("sudo", pw->pw_name, &pam_conv, &pamh) != PAM_SUCCESS) {
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log_error(USE_ERRNO|NO_EXIT|NO_MAIL,
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"unable to initialize PAM");
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return(AUTH_FATAL);
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}
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(void) pam_set_item(pamh, PAM_RUSER, user_name);
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if (strcmp(user_tty, "unknown"))
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(void) pam_set_item(pamh, PAM_TTY, user_tty);
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/*
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* Set credentials (may include resource limits, device ownership, etc).
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* We don't check the return value here because in Linux-PAM 0.75
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* it returns the last saved return code, not the return code
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* for the setcred module. Because we haven't called pam_authenticate(),
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* this is not set and so pam_setcred() returns PAM_PERM_DENIED.
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* We can't call pam_acct_mgmt() with Linux-PAM for a similar reason.
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*/
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(void) pam_setcred(pamh, PAM_ESTABLISH_CRED);
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if (pam_end(pamh, PAM_SUCCESS) == PAM_SUCCESS)
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return(PAM_SUCCESS);
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else
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return(AUTH_FAILURE);
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}
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/*
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* ``Conversation function'' for PAM.
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* XXX - does not handle PAM_BINARY_PROMPT
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*/
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static int
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sudo_conv(num_msg, msg, response, appdata_ptr)
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int num_msg;
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PAM_CONST struct pam_message **msg;
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struct pam_response **response;
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VOID *appdata_ptr;
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{
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volatile struct pam_response *pr;
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PAM_CONST struct pam_message *pm;
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const char *p = def_prompt;
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volatile char *pass;
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int n, flags;
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extern int nil_pw;
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if ((*response = malloc(num_msg * sizeof(struct pam_response))) == NULL)
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return(PAM_CONV_ERR);
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(void) memset(*response, 0, num_msg * sizeof(struct pam_response));
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for (pr = *response, pm = *msg, n = num_msg; n--; pr++, pm++) {
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flags = tgetpass_flags;
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switch (pm->msg_style) {
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case PAM_PROMPT_ECHO_ON:
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flags |= TGP_ECHO;
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case PAM_PROMPT_ECHO_OFF:
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/* Only override PAM prompt if it matches /^Password: ?/ */
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if (strncmp(pm->msg, "Password:", 9) || (pm->msg[9] != '\0'
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&& (pm->msg[9] != ' ' || pm->msg[10] != '\0')))
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p = pm->msg;
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/* Read the password. */
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pass = tgetpass(p, def_ival(I_PASSWD_TIMEOUT) * 60, flags);
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pr->resp = estrdup(pass ? pass : "");
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if (*pr->resp == '\0')
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nil_pw = 1; /* empty password */
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else
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memset(pass, 0, strlen(pass));
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break;
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case PAM_TEXT_INFO:
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if (pm->msg)
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(void) puts(pm->msg);
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break;
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case PAM_ERROR_MSG:
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if (pm->msg) {
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(void) fputs(pm->msg, stderr);
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(void) fputc('\n', stderr);
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}
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break;
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default:
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/* Zero and free allocated memory and return an error. */
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for (pr = *response, n = num_msg; n--; pr++) {
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if (pr->resp != NULL) {
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(void) memset(pr->resp, 0, strlen(pr->resp));
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free(pr->resp);
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pr->resp = NULL;
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}
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}
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(void) memset(*response, 0,
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num_msg * sizeof(struct pam_response));
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free(*response);
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*response = NULL;
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return(PAM_CONV_ERR);
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}
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}
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return(PAM_SUCCESS);
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}
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