diff options
Diffstat (limited to 'lib/libpam/modules/pam_guest/pam_guest.c')
-rw-r--r-- | lib/libpam/modules/pam_guest/pam_guest.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/lib/libpam/modules/pam_guest/pam_guest.c b/lib/libpam/modules/pam_guest/pam_guest.c new file mode 100644 index 0000000..110edce --- /dev/null +++ b/lib/libpam/modules/pam_guest/pam_guest.c @@ -0,0 +1,114 @@ +/*- + * Copyright (c) 2003 Networks Associates Technology, Inc. + * All rights reserved. + * + * Portions of this software were 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. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * 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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <string.h> + +#define PAM_SM_AUTH + +#include <security/pam_appl.h> +#include <security/pam_modules.h> +#include <security/openpam.h> + +#define DEFAULT_GUESTS "guest" + +static int +lookup(const char *str, const char *list) +{ + const char *next; + size_t len; + + len = strlen(str); + while (*list != '\0') { + while (*list == ',') + ++list; + if ((next = strchr(list, ',')) == NULL) + next = strchr(list, '\0'); + if (next - list == (ptrdiff_t)len && + strncmp(list, str, len) == 0) + return (1); + list = next; + } + return (0); +} + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, + int argc __unused, const char *argv[] __unused) +{ + const char *authtok, *guests, *user; + int err, is_guest; + + /* get target account */ + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL) + return (PAM_AUTH_ERR); + + /* get list of guest logins */ + if ((guests = openpam_get_option(pamh, "guests")) == NULL) + guests = DEFAULT_GUESTS; + + /* check if the target account is on the list */ + is_guest = lookup(user, guests); + + /* check password */ + if (!openpam_get_option(pamh, "nopass")) { + err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL); + if (err != PAM_SUCCESS) + return (err); + if (openpam_get_option(pamh, "pass_is_user") && + strcmp(user, authtok) != 0) + return (PAM_AUTH_ERR); + if (openpam_get_option(pamh, "pass_as_ruser")) + pam_set_item(pamh, PAM_RUSER, authtok); + } + + /* done */ + if (is_guest) { + pam_setenv(pamh, "GUEST", user, 1); + return (PAM_SUCCESS); + } + return (PAM_AUTH_ERR); +} + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused, + int argc __unused, const char *argv[] __unused) +{ + + return (PAM_SUCCESS); +} + +PAM_MODULE_ENTRY("pam_guest"); |