397fa72521
pam_securetty silently succeeds if the user is on a secure tty as defined by /etc/ttys. pam_ftp does "anonymous ftp" style authentication with options for specifying the anonymous user(s).
202 lines
5.3 KiB
C
202 lines
5.3 KiB
C
/*-
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* Copyright (c) 2001 Mark R V Murray
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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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* 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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* 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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#define PLEASE_ENTER_PASSWORD "Password required for %s."
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#define GUEST_LOGIN_PROMPT "Guest login ok, send your e-mail address as password."
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/* the following is a password that "can't be correct" */
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#define BLOCK_PASSWORD "\177BAD PASSWPRD\177"
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#include <security/_pam_aconf.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <stdarg.h>
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#include <string.h>
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/* here, we make a definition for the externally accessible function in this
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* file (this definition is required for static a module but strongly
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* encouraged generally) it is used to instruct the modules include file to
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* define the function prototypes. */
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#define PAM_SM_AUTH
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#include <security/pam_modules.h>
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#include <pam_mod_misc.h>
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#include <security/_pam_macros.h>
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static int
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converse(pam_handle_t *pamh, int nargs, struct pam_message **message,
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struct pam_response **response)
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{
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struct pam_conv *conv;
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int retval;
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retval = pam_get_item(pamh, PAM_CONV, (const void **)&conv);
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if (retval == PAM_SUCCESS)
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retval = conv->conv(nargs, (const struct pam_message **)message,
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response, conv->appdata_ptr);
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return retval;
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}
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static const char *anonusers[] = {"ftp", "anonymous", NULL};
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/* Check if name is in list or default list.
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* Place user's name in *user
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* Return 1 if listed 0 otherwise
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*/
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static int
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lookup(const char *name, char *list, const char **user)
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{
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int anon, i;
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char *item, *context, *locallist;
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anon = 0;
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*user = name; /* this is the default */
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if (list) {
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locallist = list;
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while ((item = strtok_r(locallist, ",", &context))) {
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locallist = NULL;
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if (strcmp(name, item) == 0) {
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*user = item;
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anon = 1;
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break;
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}
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}
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}
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else {
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for (i = 0; anonusers[i] != NULL; i++) {
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if (strcmp(anonusers[i], name) == 0) {
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*user = anonusers[0];
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anon = 1;
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break;
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}
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}
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}
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return anon;
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}
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/* --- authentication management functions (only) --- */
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/* Check if the user name is 'ftp' or 'anonymous'.
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* If this is the case, set the PAM_RUSER to the entered email address
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* and succeed, otherwise fail.
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*/
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PAM_EXTERN int
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pam_sm_authenticate(pam_handle_t * pamh, int flags, int argc, const char **argv)
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{
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struct pam_message msg[1], *mesg[1];
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struct pam_response *resp;
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int retval, anon, options, i;
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const char *user, *token;
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char *users, *context, *prompt;
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users = prompt = NULL;
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options = 0;
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for (i = 0; i < argc; i++)
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pam_std_option(&options, argv[i]);
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retval = pam_get_user(pamh, &user, NULL);
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if (retval != PAM_SUCCESS || user == NULL)
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return PAM_USER_UNKNOWN;
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anon = 0;
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if (!(options & PAM_OPT_NO_ANON))
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anon = lookup(user, users, &user);
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if (anon) {
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retval = pam_set_item(pamh, PAM_USER, (const void *)user);
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if (retval != PAM_SUCCESS || user == NULL)
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return PAM_USER_UNKNOWN;
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}
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/* Require an email address for user's password. */
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if (!anon) {
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prompt = malloc(strlen(PLEASE_ENTER_PASSWORD) + strlen(user));
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if (prompt == NULL)
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return PAM_BUF_ERR;
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else {
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sprintf(prompt, PLEASE_ENTER_PASSWORD, user);
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msg[0].msg = prompt;
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}
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}
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else
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msg[0].msg = GUEST_LOGIN_PROMPT;
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msg[0].msg_style = PAM_PROMPT_ECHO_OFF;
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mesg[0] = &msg[0];
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resp = NULL;
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retval = converse(pamh, 1, mesg, &resp);
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if (prompt) {
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_pam_overwrite(prompt);
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_pam_drop(prompt);
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}
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if (retval != PAM_SUCCESS) {
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if (resp != NULL)
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_pam_drop_reply(resp, 1);
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return retval == PAM_CONV_AGAIN
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? PAM_INCOMPLETE : PAM_AUTHINFO_UNAVAIL;
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}
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if (anon) {
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if (!(options & PAM_OPT_IGNORE)) {
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token = strtok_r(resp->resp, "@", &context);
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pam_set_item(pamh, PAM_RUSER, token);
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if ((token) && (retval == PAM_SUCCESS)) {
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token = strtok_r(NULL, "@", &context);
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pam_set_item(pamh, PAM_RHOST, token);
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}
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}
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retval = PAM_SUCCESS;
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}
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else {
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pam_set_item(pamh, PAM_AUTHTOK, resp->resp);
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retval = PAM_AUTH_ERR;
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}
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if (resp)
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_pam_drop_reply(resp, i);
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return retval;
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}
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PAM_EXTERN int
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pam_sm_setcred(pam_handle_t * pamh, int flags, int argc, const char **argv)
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{
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return PAM_IGNORE;
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}
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/* end of module definition */
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PAM_MODULE_ENTRY("pam_ftp");
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