diff options
Diffstat (limited to 'lib/libpam/modules/pam_radius/pam_radius.c')
| -rw-r--r-- | lib/libpam/modules/pam_radius/pam_radius.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/lib/libpam/modules/pam_radius/pam_radius.c b/lib/libpam/modules/pam_radius/pam_radius.c new file mode 100644 index 0000000..306c4b7 --- /dev/null +++ b/lib/libpam/modules/pam_radius/pam_radius.c @@ -0,0 +1,366 @@ +/*- + * Copyright 1998 Juniper Networks, Inc. + * All rights reserved. + * Copyright (c) 2001-2003 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 <sys/param.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netdb.h> +#include <pwd.h> +#include <radlib.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> + +#define PAM_SM_AUTH + +#include <security/pam_appl.h> +#include <security/pam_modules.h> +#include <security/pam_mod_misc.h> + +#define PAM_OPT_CONF "conf" +#define PAM_OPT_TEMPLATE_USER "template_user" +#define PAM_OPT_NAS_ID "nas_id" +#define PAM_OPT_NAS_IPADDR "nas_ipaddr" + +#define MAX_CHALLENGE_MSGS 10 +#define PASSWORD_PROMPT "RADIUS Password:" + +static int build_access_request(struct rad_handle *, const char *, + const char *, const char *, const char *, const void *, + size_t); +static int do_accept(pam_handle_t *, struct rad_handle *); +static int do_challenge(pam_handle_t *, struct rad_handle *, + const char *, const char *, const char *); + +/* + * Construct an access request, but don't send it. Returns 0 on success, + * -1 on failure. + */ +static int +build_access_request(struct rad_handle *radh, const char *user, + const char *pass, const char *nas_id, const char *nas_ipaddr, + const void *state, size_t state_len) +{ + int error; + char host[MAXHOSTNAMELEN]; + struct sockaddr_in *haddr; + struct addrinfo hints; + struct addrinfo *res; + + if (rad_create_request(radh, RAD_ACCESS_REQUEST) == -1) { + syslog(LOG_CRIT, "rad_create_request: %s", rad_strerror(radh)); + return (-1); + } + if (nas_id == NULL || + (nas_ipaddr != NULL && strlen(nas_ipaddr) == 0)) { + if (gethostname(host, sizeof host) != -1) { + if (nas_id == NULL) + nas_id = host; + if (nas_ipaddr != NULL && strlen(nas_ipaddr) == 0) + nas_ipaddr = host; + } + } + if ((user != NULL && + rad_put_string(radh, RAD_USER_NAME, user) == -1) || + (pass != NULL && + rad_put_string(radh, RAD_USER_PASSWORD, pass) == -1) || + (nas_id != NULL && + rad_put_string(radh, RAD_NAS_IDENTIFIER, nas_id) == -1)) { + syslog(LOG_CRIT, "rad_put_string: %s", rad_strerror(radh)); + return (-1); + } + if (nas_ipaddr != NULL) { + memset(&hints, 0, sizeof(hints)); + hints.ai_family = AF_INET; + if (getaddrinfo(nas_ipaddr, NULL, &hints, &res) == 0 && + res != NULL && res->ai_family == AF_INET) { + haddr = (struct sockaddr_in *)res->ai_addr; + error = rad_put_addr(radh, RAD_NAS_IP_ADDRESS, + haddr->sin_addr); + freeaddrinfo(res); + if (error == -1) { + syslog(LOG_CRIT, "rad_put_addr: %s", + rad_strerror(radh)); + return (-1); + } + } + } + if (state != NULL && rad_put_attr(radh, RAD_STATE, state, + state_len) == -1) { + syslog(LOG_CRIT, "rad_put_attr: %s", rad_strerror(radh)); + return (-1); + } + if (rad_put_int(radh, RAD_SERVICE_TYPE, RAD_AUTHENTICATE_ONLY) == -1) { + syslog(LOG_CRIT, "rad_put_int: %s", rad_strerror(radh)); + return (-1); + } + return (0); +} + +static int +do_accept(pam_handle_t *pamh, struct rad_handle *radh) +{ + int attrtype; + const void *attrval; + size_t attrlen; + char *s; + + while ((attrtype = rad_get_attr(radh, &attrval, &attrlen)) > 0) { + if (attrtype == RAD_USER_NAME) { + s = rad_cvt_string(attrval, attrlen); + if (s == NULL) { + syslog(LOG_CRIT, + "rad_cvt_string: out of memory"); + return (-1); + } + pam_set_item(pamh, PAM_USER, s); + free(s); + } + } + if (attrtype == -1) { + syslog(LOG_CRIT, "rad_get_attr: %s", rad_strerror(radh)); + return (-1); + } + return (0); +} + +static int +do_challenge(pam_handle_t *pamh, struct rad_handle *radh, const char *user, + const char *nas_id, const char *nas_ipaddr) +{ + int retval; + int attrtype; + const void *attrval; + size_t attrlen; + const void *state; + size_t statelen; + struct pam_message msgs[MAX_CHALLENGE_MSGS]; + const struct pam_message *msg_ptrs[MAX_CHALLENGE_MSGS]; + struct pam_response *resp; + int num_msgs; + const void *item; + const struct pam_conv *conv; + + state = NULL; + statelen = 0; + num_msgs = 0; + while ((attrtype = rad_get_attr(radh, &attrval, &attrlen)) > 0) { + switch (attrtype) { + + case RAD_STATE: + state = attrval; + statelen = attrlen; + break; + + case RAD_REPLY_MESSAGE: + if (num_msgs >= MAX_CHALLENGE_MSGS) { + syslog(LOG_CRIT, + "Too many RADIUS challenge messages"); + return (PAM_SERVICE_ERR); + } + msgs[num_msgs].msg = rad_cvt_string(attrval, attrlen); + if (msgs[num_msgs].msg == NULL) { + syslog(LOG_CRIT, + "rad_cvt_string: out of memory"); + return (PAM_SERVICE_ERR); + } + msgs[num_msgs].msg_style = PAM_TEXT_INFO; + msg_ptrs[num_msgs] = &msgs[num_msgs]; + num_msgs++; + break; + } + } + if (attrtype == -1) { + syslog(LOG_CRIT, "rad_get_attr: %s", rad_strerror(radh)); + return (PAM_SERVICE_ERR); + } + if (num_msgs == 0) { + msgs[num_msgs].msg = strdup("(null RADIUS challenge): "); + if (msgs[num_msgs].msg == NULL) { + syslog(LOG_CRIT, "Out of memory"); + return (PAM_SERVICE_ERR); + } + msgs[num_msgs].msg_style = PAM_TEXT_INFO; + msg_ptrs[num_msgs] = &msgs[num_msgs]; + num_msgs++; + } + msgs[num_msgs-1].msg_style = PAM_PROMPT_ECHO_ON; + if ((retval = pam_get_item(pamh, PAM_CONV, &item)) != PAM_SUCCESS) { + syslog(LOG_CRIT, "do_challenge: cannot get PAM_CONV"); + return (retval); + } + conv = (const struct pam_conv *)item; + if ((retval = conv->conv(num_msgs, msg_ptrs, &resp, + conv->appdata_ptr)) != PAM_SUCCESS) + return (retval); + if (build_access_request(radh, user, resp[num_msgs-1].resp, nas_id, + nas_ipaddr, state, statelen) == -1) + return (PAM_SERVICE_ERR); + memset(resp[num_msgs-1].resp, 0, strlen(resp[num_msgs-1].resp)); + free(resp[num_msgs-1].resp); + free(resp); + while (num_msgs > 0) + free(msgs[--num_msgs].msg); + return (PAM_SUCCESS); +} + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh, int flags __unused, + int argc __unused, const char *argv[] __unused) +{ + struct rad_handle *radh; + const char *user, *pass; + const void *tmpuser; + const char *conf_file, *template_user, *nas_id, *nas_ipaddr; + int retval; + int e; + + conf_file = openpam_get_option(pamh, PAM_OPT_CONF); + template_user = openpam_get_option(pamh, PAM_OPT_TEMPLATE_USER); + nas_id = openpam_get_option(pamh, PAM_OPT_NAS_ID); + nas_ipaddr = openpam_get_option(pamh, PAM_OPT_NAS_IPADDR); + + retval = pam_get_user(pamh, &user, NULL); + if (retval != PAM_SUCCESS) + return (retval); + + PAM_LOG("Got user: %s", user); + + retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, PASSWORD_PROMPT); + if (retval != PAM_SUCCESS) + return (retval); + + PAM_LOG("Got password"); + + radh = rad_open(); + if (radh == NULL) { + syslog(LOG_CRIT, "rad_open failed"); + return (PAM_SERVICE_ERR); + } + + PAM_LOG("Radius opened"); + + if (rad_config(radh, conf_file) == -1) { + syslog(LOG_ALERT, "rad_config: %s", rad_strerror(radh)); + rad_close(radh); + return (PAM_SERVICE_ERR); + } + + PAM_LOG("Radius config file read"); + + if (build_access_request(radh, user, pass, nas_id, nas_ipaddr, NULL, + 0) == -1) { + rad_close(radh); + return (PAM_SERVICE_ERR); + } + + PAM_LOG("Radius build access done"); + + for (;;) { + switch (rad_send_request(radh)) { + + case RAD_ACCESS_ACCEPT: + e = do_accept(pamh, radh); + rad_close(radh); + if (e == -1) + return (PAM_SERVICE_ERR); + if (template_user != NULL) { + + PAM_LOG("Trying template user: %s", + template_user); + + /* + * If the given user name doesn't exist in + * the local password database, change it + * to the value given in the "template_user" + * option. + */ + retval = pam_get_item(pamh, PAM_USER, &tmpuser); + if (retval != PAM_SUCCESS) + return (retval); + if (getpwnam(tmpuser) == NULL) { + pam_set_item(pamh, PAM_USER, + template_user); + PAM_LOG("Using template user"); + } + + } + return (PAM_SUCCESS); + + case RAD_ACCESS_REJECT: + rad_close(radh); + PAM_VERBOSE_ERROR("Radius rejection"); + return (PAM_AUTH_ERR); + + case RAD_ACCESS_CHALLENGE: + retval = do_challenge(pamh, radh, user, nas_id, + nas_ipaddr); + if (retval != PAM_SUCCESS) { + rad_close(radh); + return (retval); + } + break; + + case -1: + syslog(LOG_CRIT, "rad_send_request: %s", + rad_strerror(radh)); + rad_close(radh); + PAM_VERBOSE_ERROR("Radius failure"); + return (PAM_AUTHINFO_UNAVAIL); + + default: + syslog(LOG_CRIT, + "rad_send_request: unexpected return value"); + rad_close(radh); + PAM_VERBOSE_ERROR("Radius error"); + return (PAM_SERVICE_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_radius"); 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