diff options
Diffstat (limited to 'crypto/openssh/auth2-pam-freebsd.c')
| -rw-r--r-- | crypto/openssh/auth2-pam-freebsd.c | 630 |
1 files changed, 0 insertions, 630 deletions
diff --git a/crypto/openssh/auth2-pam-freebsd.c b/crypto/openssh/auth2-pam-freebsd.c deleted file mode 100644 index 234a67e3fddd..000000000000 --- a/crypto/openssh/auth2-pam-freebsd.c +++ /dev/null @@ -1,630 +0,0 @@ -/*- - * Copyright (c) 2002 Networks Associates Technology, Inc. - * All rights reserved. - * - * This software was developed for the FreeBSD Project by ThinkSec AS and - * NAI Labs, the Security Research Division of Network Associates, Inc. - * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the - * DARPA CHATS research program. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 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. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. - */ - -#include "includes.h" -RCSID("$FreeBSD$"); - -#ifdef USE_PAM -#include <security/pam_appl.h> - -#include "auth.h" -#include "auth-pam.h" -#include "buffer.h" -#include "bufaux.h" -#include "canohost.h" -#include "log.h" -#include "monitor_wrap.h" -#include "msg.h" -#include "packet.h" -#include "readpass.h" -#include "servconf.h" -#include "ssh2.h" -#include "xmalloc.h" - -#ifdef USE_POSIX_THREADS -#include <pthread.h> -#else -/* - * Simulate threads with processes. - */ -typedef pid_t pthread_t; - -static void -pthread_exit(void *value __unused) -{ - _exit(0); -} - -static int -pthread_create(pthread_t *thread, const void *attr __unused, - void *(*thread_start)(void *), void *arg) -{ - pid_t pid; - - switch ((pid = fork())) { - case -1: - error("fork(): %s", strerror(errno)); - return (-1); - case 0: - thread_start(arg); - _exit(1); - default: - *thread = pid; - return (0); - } -} - -static int -pthread_cancel(pthread_t thread) -{ - return (kill(thread, SIGTERM)); -} - -static int -pthread_join(pthread_t thread, void **value __unused) -{ - int status; - - waitpid(thread, &status, 0); - return (status); -} -#endif - - -static pam_handle_t *pam_handle; -static int pam_err; -static int pam_authenticated; -static int pam_new_authtok_reqd; -static int pam_session_open; -static int pam_cred_established; - -struct pam_ctxt { - pthread_t pam_thread; - int pam_psock; - int pam_csock; - int pam_done; -}; - -static void pam_free_ctx(void *); - -/* - * Conversation function for authentication thread. - */ -static int -pam_thread_conv(int n, - const struct pam_message **msg, - struct pam_response **resp, - void *data) -{ - Buffer buffer; - struct pam_ctxt *ctxt; - int i; - - ctxt = data; - if (n <= 0 || n > PAM_MAX_NUM_MSG) - return (PAM_CONV_ERR); - *resp = xmalloc(n * sizeof **resp); - buffer_init(&buffer); - for (i = 0; i < n; ++i) { - resp[i]->resp_retcode = 0; - resp[i]->resp = NULL; - switch (msg[i]->msg_style) { - case PAM_PROMPT_ECHO_OFF: - buffer_put_cstring(&buffer, msg[i]->msg); - ssh_msg_send(ctxt->pam_csock, msg[i]->msg_style, &buffer); - ssh_msg_recv(ctxt->pam_csock, &buffer); - if (buffer_get_char(&buffer) != PAM_AUTHTOK) - goto fail; - resp[i]->resp = buffer_get_string(&buffer, NULL); - break; - case PAM_PROMPT_ECHO_ON: - buffer_put_cstring(&buffer, msg[i]->msg); - ssh_msg_send(ctxt->pam_csock, msg[i]->msg_style, &buffer); - ssh_msg_recv(ctxt->pam_csock, &buffer); - if (buffer_get_char(&buffer) != PAM_AUTHTOK) - goto fail; - resp[i]->resp = buffer_get_string(&buffer, NULL); - break; - case PAM_ERROR_MSG: - buffer_put_cstring(&buffer, msg[i]->msg); - ssh_msg_send(ctxt->pam_csock, msg[i]->msg_style, &buffer); - break; - case PAM_TEXT_INFO: - buffer_put_cstring(&buffer, msg[i]->msg); - ssh_msg_send(ctxt->pam_csock, msg[i]->msg_style, &buffer); - break; - default: - goto fail; - } - buffer_clear(&buffer); - } - buffer_free(&buffer); - return (PAM_SUCCESS); - fail: - while (i) - xfree(resp[--i]); - xfree(*resp); - *resp = NULL; - buffer_free(&buffer); - return (PAM_CONV_ERR); -} - -/* - * Authentication thread. - */ -static void * -pam_thread(void *ctxtp) -{ - struct pam_ctxt *ctxt = ctxtp; - Buffer buffer; - struct pam_conv pam_conv = { pam_thread_conv, ctxt }; - -#ifndef USE_POSIX_THREADS - { - const char *pam_user; - - pam_get_item(pam_handle, PAM_USER, (const void **)&pam_user); - setproctitle("%s [pam]", pam_user); - } -#endif - buffer_init(&buffer); - pam_err = pam_set_item(pam_handle, PAM_CONV, (const void *)&pam_conv); - if (pam_err != PAM_SUCCESS) - goto auth_fail; - pam_err = pam_authenticate(pam_handle, 0); - if (pam_err != PAM_SUCCESS) - goto auth_fail; - pam_err = pam_acct_mgmt(pam_handle, 0); - if (pam_err != PAM_SUCCESS && pam_err != PAM_NEW_AUTHTOK_REQD) - goto auth_fail; - buffer_put_cstring(&buffer, "OK"); - ssh_msg_send(ctxt->pam_csock, pam_err, &buffer); - buffer_free(&buffer); - pthread_exit(NULL); - auth_fail: - buffer_put_cstring(&buffer, - pam_strerror(pam_handle, pam_err)); - ssh_msg_send(ctxt->pam_csock, PAM_AUTH_ERR, &buffer); - buffer_free(&buffer); - pthread_exit(NULL); -} - -static void -pam_thread_cleanup(void *ctxtp) -{ - struct pam_ctxt *ctxt = ctxtp; - - pthread_cancel(ctxt->pam_thread); - pthread_join(ctxt->pam_thread, NULL); - close(ctxt->pam_psock); - close(ctxt->pam_csock); -} - -static int -pam_null_conv(int n, - const struct pam_message **msg, - struct pam_response **resp, - void *data) -{ - - return (PAM_CONV_ERR); -} - -static struct pam_conv null_conv = { pam_null_conv, NULL }; - -static void -pam_cleanup(void *arg) -{ - (void)arg; - debug("PAM: cleanup"); - pam_set_item(pam_handle, PAM_CONV, (const void *)&null_conv); - if (pam_cred_established) { - pam_setcred(pam_handle, PAM_DELETE_CRED); - pam_cred_established = 0; - } - if (pam_session_open) { - pam_close_session(pam_handle, PAM_SILENT); - pam_session_open = 0; - } - pam_authenticated = pam_new_authtok_reqd = 0; - pam_end(pam_handle, pam_err); - pam_handle = NULL; -} - -static int -pam_init(const char *user) -{ - extern ServerOptions options; - extern u_int utmp_len; - const char *pam_rhost, *pam_user; - - if (pam_handle != NULL) { - /* We already have a PAM context; check if the user matches */ - pam_err = pam_get_item(pam_handle, - PAM_USER, (const void **)&pam_user); - if (pam_err == PAM_SUCCESS && strcmp(user, pam_user) == 0) - return (0); - fatal_remove_cleanup(pam_cleanup, NULL); - pam_end(pam_handle, pam_err); - pam_handle = NULL; - } - debug("PAM: initializing for \"%s\"", user); - pam_err = pam_start("sshd", user, &null_conv, &pam_handle); - if (pam_err != PAM_SUCCESS) - return (-1); - pam_rhost = get_remote_name_or_ip(utmp_len, - options.verify_reverse_mapping); - debug("PAM: setting PAM_RHOST to \"%s\"", pam_rhost); - pam_err = pam_set_item(pam_handle, PAM_RHOST, pam_rhost); - if (pam_err != PAM_SUCCESS) { - pam_end(pam_handle, pam_err); - pam_handle = NULL; - return (-1); - } - fatal_add_cleanup(pam_cleanup, NULL); - return (0); -} - -static void * -pam_init_ctx(Authctxt *authctxt) -{ - struct pam_ctxt *ctxt; - int socks[2]; - - /* Initialize PAM */ - if (pam_init(authctxt->user) == -1) { - error("PAM: initialization failed"); - return (NULL); - } - - ctxt = xmalloc(sizeof *ctxt); - ctxt->pam_done = 0; - - /* Start the authentication thread */ - if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, socks) == -1) { - error("PAM: failed create sockets: %s", strerror(errno)); - xfree(ctxt); - return (NULL); - } - ctxt->pam_psock = socks[0]; - ctxt->pam_csock = socks[1]; - if (pthread_create(&ctxt->pam_thread, NULL, pam_thread, ctxt) == -1) { - error("PAM: failed to start authentication thread: %s", - strerror(errno)); - close(socks[0]); - close(socks[1]); - xfree(ctxt); - return (NULL); - } - fatal_add_cleanup(pam_thread_cleanup, ctxt); - return (ctxt); -} - -static int -pam_query(void *ctx, char **name, char **info, - u_int *num, char ***prompts, u_int **echo_on) -{ - Buffer buffer; - struct pam_ctxt *ctxt = ctx; - size_t plen; - u_char type; - char *msg; - - buffer_init(&buffer); - *name = xstrdup(""); - *info = xstrdup(""); - *prompts = xmalloc(sizeof(char *)); - **prompts = NULL; - plen = 0; - *echo_on = xmalloc(sizeof(u_int)); - while (ssh_msg_recv(ctxt->pam_psock, &buffer) == 0) { - type = buffer_get_char(&buffer); - msg = buffer_get_string(&buffer, NULL); - switch (type) { - case PAM_PROMPT_ECHO_ON: - case PAM_PROMPT_ECHO_OFF: - *num = 1; - **prompts = xrealloc(**prompts, plen + strlen(msg) + 1); - plen += sprintf(**prompts + plen, "%s", msg); - **echo_on = (type == PAM_PROMPT_ECHO_ON); - xfree(msg); - return (0); - case PAM_ERROR_MSG: - case PAM_TEXT_INFO: - /* accumulate messages */ - **prompts = xrealloc(**prompts, plen + strlen(msg) + 1); - plen += sprintf(**prompts + plen, "%s", msg); - xfree(msg); - break; - case PAM_NEW_AUTHTOK_REQD: - pam_new_authtok_reqd = 1; - /* FALLTHROUGH */ - case PAM_SUCCESS: - case PAM_AUTH_ERR: - if (**prompts != NULL) { - /* drain any accumulated messages */ -#if 0 /* not compatible with privsep */ - packet_start(SSH2_MSG_USERAUTH_BANNER); - packet_put_cstring(**prompts); - packet_put_cstring(""); - packet_send(); - packet_write_wait(); -#endif - xfree(**prompts); - **prompts = NULL; - } - if (type == PAM_SUCCESS) { - *num = 0; - **echo_on = 0; - ctxt->pam_done = 1; - xfree(msg); - return (0); - } - error("PAM: %s", msg); - default: - *num = 0; - **echo_on = 0; - xfree(msg); - ctxt->pam_done = -1; - return (-1); - } - } - return (-1); -} - -static int -pam_respond(void *ctx, u_int num, char **resp) -{ - Buffer buffer; - struct pam_ctxt *ctxt = ctx; - char *msg; - - debug2("PAM: %s", __func__); - switch (ctxt->pam_done) { - case 1: - pam_authenticated = 1; - return (0); - case 0: - break; - default: - return (-1); - } - if (num != 1) { - error("PAM: expected one response, got %u", num); - return (-1); - } - buffer_init(&buffer); - buffer_put_cstring(&buffer, *resp); - ssh_msg_send(ctxt->pam_psock, PAM_AUTHTOK, &buffer); - buffer_free(&buffer); - return (1); -} - -static void -pam_free_ctx(void *ctxtp) -{ - struct pam_ctxt *ctxt = ctxtp; - - fatal_remove_cleanup(pam_thread_cleanup, ctxt); - pam_thread_cleanup(ctxtp); - xfree(ctxt); - /* - * We don't call pam_cleanup() here because we may need the PAM - * handle at a later stage, e.g. when setting up a session. It's - * still on the cleanup list, so pam_end() *will* be called before - * the server process terminates. - */ -} - -KbdintDevice pam_device = { - "pam", - pam_init_ctx, - pam_query, - pam_respond, - pam_free_ctx -}; - -KbdintDevice mm_pam_device = { - "pam", - mm_pam_init_ctx, - mm_pam_query, - mm_pam_respond, - mm_pam_free_ctx -}; - -/* - * This replaces auth-pam.c - */ -void -start_pam(const char *user) -{ - if (pam_init(user) == -1) - fatal("PAM: initialisation failed"); -} - -void -finish_pam(void) -{ - fatal_remove_cleanup(pam_cleanup, NULL); - pam_cleanup(NULL); -} - -int -do_pam_account(const char *user, const char *ruser) -{ - /* XXX */ - return (1); -} - -void -do_pam_session(const char *user, const char *tty) -{ - pam_err = pam_set_item(pam_handle, PAM_CONV, (const void *)&null_conv); - if (pam_err != PAM_SUCCESS) - fatal("PAM: failed to set PAM_CONV: %s", - pam_strerror(pam_handle, pam_err)); - debug("PAM: setting PAM_TTY to \"%s\"", tty); - pam_err = pam_set_item(pam_handle, PAM_TTY, tty); - if (pam_err != PAM_SUCCESS) - fatal("PAM: failed to set PAM_TTY: %s", - pam_strerror(pam_handle, pam_err)); - pam_err = pam_open_session(pam_handle, 0); - if (pam_err != PAM_SUCCESS) - fatal("PAM: pam_open_session(): %s", - pam_strerror(pam_handle, pam_err)); - pam_session_open = 1; -} - -void -do_pam_setcred(int init) -{ - pam_err = pam_set_item(pam_handle, PAM_CONV, (const void *)&null_conv); - if (pam_err != PAM_SUCCESS) - fatal("PAM: failed to set PAM_CONV: %s", - pam_strerror(pam_handle, pam_err)); - if (init) { - debug("PAM: establishing credentials"); - pam_err = pam_setcred(pam_handle, PAM_ESTABLISH_CRED); - } else { - debug("PAM: reinitializing credentials"); - pam_err = pam_setcred(pam_handle, PAM_REINITIALIZE_CRED); - } - if (pam_err == PAM_SUCCESS) { - pam_cred_established = 1; - return; - } - if (pam_authenticated) - fatal("PAM: pam_setcred(): %s", - pam_strerror(pam_handle, pam_err)); - else - debug("PAM: pam_setcred(): %s", - pam_strerror(pam_handle, pam_err)); -} - -int -is_pam_password_change_required(void) -{ - return (pam_new_authtok_reqd); -} - -static int -pam_chauthtok_conv(int n, - const struct pam_message **msg, - struct pam_response **resp, - void *data) -{ - char input[PAM_MAX_MSG_SIZE]; - int i; - - if (n <= 0 || n > PAM_MAX_NUM_MSG) - return (PAM_CONV_ERR); - *resp = xmalloc(n * sizeof **resp); - for (i = 0; i < n; ++i) { - switch (msg[i]->msg_style) { - case PAM_PROMPT_ECHO_OFF: - resp[i]->resp = - read_passphrase(msg[i]->msg, RP_ALLOW_STDIN); - resp[i]->resp_retcode = PAM_SUCCESS; - break; - case PAM_PROMPT_ECHO_ON: - fputs(msg[i]->msg, stderr); - fgets(input, sizeof input, stdin); - resp[i]->resp = xstrdup(input); - resp[i]->resp_retcode = PAM_SUCCESS; - break; - case PAM_ERROR_MSG: - case PAM_TEXT_INFO: - fputs(msg[i]->msg, stderr); - resp[i]->resp_retcode = PAM_SUCCESS; - break; - default: - goto fail; - } - } - return (PAM_SUCCESS); - fail: - while (i) - xfree(resp[--i]); - xfree(*resp); - *resp = NULL; - return (PAM_CONV_ERR); -} - -/* - * XXX this should be done in the authentication phase, but ssh1 doesn't - * support that - */ -void -do_pam_chauthtok(void) -{ - struct pam_conv pam_conv = { pam_chauthtok_conv, NULL }; - - if (use_privsep) - fatal("PAM: chauthtok not supprted with privsep"); - pam_err = pam_set_item(pam_handle, PAM_CONV, (const void *)&pam_conv); - if (pam_err != PAM_SUCCESS) - fatal("PAM: failed to set PAM_CONV: %s", - pam_strerror(pam_handle, pam_err)); - debug("PAM: changing password"); - pam_err = pam_chauthtok(pam_handle, PAM_CHANGE_EXPIRED_AUTHTOK); - if (pam_err != PAM_SUCCESS) - fatal("PAM: pam_chauthtok(): %s", - pam_strerror(pam_handle, pam_err)); -} - -void -print_pam_messages(void) -{ - /* XXX */ -} - -char ** -fetch_pam_environment(void) -{ -#ifdef HAVE_PAM_GETENVLIST - debug("PAM: retrieving environment"); - return (pam_getenvlist(pam_handle)); -#else - return (NULL); -#endif -} - -void -free_pam_environment(char **env) -{ - char **envp; - - for (envp = env; *envp; envp++) - xfree(*envp); - xfree(env); -} - -#endif /* USE_PAM */ |