/*
- * otp_rlm.c
* $Id$
*
* This program is free software; you can redistribute it and/or modify
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Copyright 2000,2001,2002 The FreeRADIUS server project
* Copyright 2001,2002 Google, Inc.
- * Copyright 2005 Frank Cusack
+ * Copyright 2005,2006 TRI-D Systems, Inc.
*/
-/*
- * STRONG WARNING SECTION:
- *
- * ANSI X9.9 has been withdrawn as a standard, due to the weakness of DES.
- * An attacker can learn the token's secret by observing two
- * challenge/response pairs. See ANSI document X9 TG-24-1999
- * <URL:http://www.x9.org/docs/TG24_1999.pdf>.
- *
- * Please read the accompanying docs.
- */
+#include "ident.h"
+RCSID("$Id$")
-/*
- * TODO: support setting multiple auth-types in authorize()
- * TODO: support other than ILP32 (for State)
- */
+#include <autoconf.h>
+#include <radiusd.h>
+#include <modules.h>
+#include "extern.h"
+#include "otp.h"
+#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <fcntl.h>
#include <time.h>
#include <netinet/in.h> /* htonl(), ntohl() */
-#include "otp.h"
-#ifdef FREERADIUS
-#include "modules.h"
-#endif
-
-static const char rcsid[] = "$Id$";
-
/* Global data */
-static unsigned char hmac_key[16]; /* to protect State attribute */
-static int ninstance = 0; /* #instances, for global init */
+static unsigned char hmac_key[16]; /* to protect State attribute */
+static int ninstance = 0; /* #instances, for global init */
/* A mapping of configuration file names to internal variables. */
static const CONF_PARSER module_config[] = {
- { "pwdfile", PW_TYPE_STRING_PTR, offsetof(otp_option_t, pwdfile),
- NULL, OTP_PWDFILE },
- { "lsmd_rp", PW_TYPE_STRING_PTR, offsetof(otp_option_t, lsmd_rp),
- NULL, OTP_LSMD_RP },
- { "challenge_prompt", PW_TYPE_STRING_PTR,offsetof(otp_option_t,chal_prompt),
- NULL, OTP_CHALLENGE_PROMPT },
- { "challenge_length", PW_TYPE_INTEGER, offsetof(otp_option_t, chal_len),
- NULL, "6" },
- { "challenge_delay", PW_TYPE_INTEGER, offsetof(otp_option_t, chal_delay),
- NULL, "30" },
- { "softfail", PW_TYPE_INTEGER, offsetof(otp_option_t, softfail),
- NULL, "5" },
- { "hardfail", PW_TYPE_INTEGER, offsetof(otp_option_t, hardfail),
- NULL, "0" },
- { "allow_sync", PW_TYPE_BOOLEAN, offsetof(otp_option_t, allow_sync),
- NULL, "yes" },
- { "fast_sync", PW_TYPE_BOOLEAN, offsetof(otp_option_t, fast_sync),
- NULL, "yes" },
- { "allow_async", PW_TYPE_BOOLEAN, offsetof(otp_option_t, allow_async),
- NULL, "no" },
- { "challenge_req", PW_TYPE_STRING_PTR, offsetof(otp_option_t, chal_req),
- NULL, OTP_CHALLENGE_REQ },
- { "resync_req", PW_TYPE_STRING_PTR, offsetof(otp_option_t, resync_req),
- NULL, OTP_RESYNC_REQ },
- { "prepend_pin", PW_TYPE_BOOLEAN, offsetof(otp_option_t, prepend_pin),
- NULL, "yes" },
- { "ewindow_size", PW_TYPE_INTEGER, offsetof(otp_option_t, ewindow_size),
- NULL, "0" },
- { "ewindow2_size", PW_TYPE_INTEGER, offsetof(otp_option_t, ewindow2_size),
- NULL, "0" },
- { "ewindow2_delay", PW_TYPE_INTEGER, offsetof(otp_option_t, ewindow2_delay),
- NULL, "60" },
- { "mschapv2_mppe", PW_TYPE_INTEGER,
- offsetof(otp_option_t, mschapv2_mppe_policy), NULL, "2" },
- { "mschapv2_mppe_bits", PW_TYPE_INTEGER,
- offsetof(otp_option_t, mschapv2_mppe_types), NULL, "2" },
- { "mschap_mppe", PW_TYPE_INTEGER,
- offsetof(otp_option_t, mschap_mppe_policy), NULL, "2" },
- { "mschap_mppe_bits", PW_TYPE_INTEGER,
- offsetof(otp_option_t, mschap_mppe_types), NULL, "2" },
-#if 0
- { "twindow_min", PW_TYPE_INTEGER, offsetof(otp_option_t, twindow_min),
- NULL, "0" },
- { "twindow_max", PW_TYPE_INTEGER, offsetof(otp_option_t, twindow_max),
- NULL, "0" },
-#endif
-
- { NULL, -1, 0, NULL, NULL } /* end the list */
+ { "otpd_rp", PW_TYPE_STRING_PTR, offsetof(otp_option_t, otpd_rp),
+ NULL, OTP_OTPD_RP },
+ { "challenge_prompt", PW_TYPE_STRING_PTR,offsetof(otp_option_t, chal_prompt),
+ NULL, OTP_CHALLENGE_PROMPT },
+ { "challenge_length", PW_TYPE_INTEGER, offsetof(otp_option_t, challenge_len),
+ NULL, "6" },
+ { "challenge_delay", PW_TYPE_INTEGER, offsetof(otp_option_t, challenge_delay),
+ NULL, "30" },
+ { "allow_sync", PW_TYPE_BOOLEAN, offsetof(otp_option_t, allow_sync),
+ NULL, "yes" },
+ { "allow_async", PW_TYPE_BOOLEAN, offsetof(otp_option_t, allow_async),
+ NULL, "no" },
+
+ { "mschapv2_mppe", PW_TYPE_INTEGER,
+ offsetof(otp_option_t, mschapv2_mppe_policy), NULL, "2" },
+ { "mschapv2_mppe_bits", PW_TYPE_INTEGER,
+ offsetof(otp_option_t, mschapv2_mppe_types), NULL, "2" },
+ { "mschap_mppe", PW_TYPE_INTEGER,
+ offsetof(otp_option_t, mschap_mppe_policy), NULL, "2" },
+ { "mschap_mppe_bits", PW_TYPE_INTEGER,
+ offsetof(otp_option_t, mschap_mppe_types), NULL, "2" },
+
+ { NULL, -1, 0, NULL, NULL } /* end the list */
};
-/* transform otp_pw_valid() return code into an rlm return code */
-static int
-otprc2rlmrc(int rc)
-{
- switch (rc) {
- case OTP_RC_OK: return RLM_MODULE_OK;
- case OTP_RC_USER_UNKNOWN: return RLM_MODULE_REJECT;
- case OTP_RC_AUTHINFO_UNAVAIL: return RLM_MODULE_REJECT;
- case OTP_RC_AUTH_ERR: return RLM_MODULE_REJECT;
- case OTP_RC_MAXTRIES: return RLM_MODULE_USERLOCK;
- case OTP_RC_SERVICE_ERR: return RLM_MODULE_FAIL;
- default: return RLM_MODULE_FAIL;
- }
-}
-
-
/* per-instance initialization */
static int
otp_instantiate(CONF_SECTION *conf, void **instance)
{
- otp_option_t *opt;
- char *p;
+ otp_option_t *opt;
+ char *p;
- /* Set up a storage area for instance data. */
- opt = rad_malloc(sizeof(*opt));
- (void) memset(opt, 0, sizeof(*opt));
+ /* Set up a storage area for instance data. */
+ opt = rad_malloc(sizeof(*opt));
+ (void) memset(opt, 0, sizeof(*opt));
- /* If the configuration parameters can't be parsed, then fail. */
- if (cf_section_parse(conf, opt, module_config) < 0) {
- free(opt);
- return -1;
- }
+ /* If the configuration parameters can't be parsed, then fail. */
+ if (cf_section_parse(conf, opt, module_config) < 0) {
+ free(opt);
+ return -1;
+ }
- /* Onetime initialization. */
- if (!ninstance) {
- /* Generate a random key, used to protect the State attribute. */
- if (otp_get_random(-1, hmac_key, sizeof(hmac_key)) == -1) {
- otp_log(OTP_LOG_ERR, "failed to obtain random data for hmac_key");
- free(opt);
- return -1;
- }
-
- /* Initialize the passcode encoding/checking functions. */
- otp_pwe_init();
-
- /*
- * Don't do this again.
- * Only the main thread instantiates and detaches instances,
- * so this does not need mutex protection.
- */
- ninstance++;
- }
+ /* Onetime initialization. */
+ if (!ninstance) {
+ /* Generate a random key, used to protect the State attribute. */
+ otp_get_random(hmac_key, sizeof(hmac_key));
- /* Verify ranges for those vars that are limited. */
- if ((opt->chal_len < 5) || (opt->chal_len > OTP_MAX_CHALLENGE_LEN)) {
- opt->chal_len = 6;
- otp_log(OTP_LOG_ERR,
- "invalid challenge_length, range 5-%d, using default of 6",
- OTP_MAX_CHALLENGE_LEN);
+ /* Initialize the passcode encoding/checking functions. */
+ otp_pwe_init();
- }
-
- /* Enforce a single "%" sequence, which must be "%s" */
- p = strchr(opt->chal_prompt, '%');
- if ((p == NULL) || (p != strrchr(opt->chal_prompt, '%')) ||
- strncmp(p,"%s",2)){
- free(opt->chal_prompt);
- opt->chal_prompt = strdup(OTP_CHALLENGE_PROMPT);
- otp_log(OTP_LOG_ERR,
- "invalid challenge_prompt, using default of \"%s\"",
- OTP_CHALLENGE_PROMPT);
- }
-
- if (opt->softfail < 0) {
- opt->softfail = 5;
- otp_log(OTP_LOG_ERR, "softfail must be at least 1 "
- "(or 0 == infinite), using default of 5");
- }
-
- if (opt->hardfail < 0) {
- opt->hardfail = 0;
- otp_log(OTP_LOG_ERR, "hardfail must be at least 1 "
- "(or 0 == infinite), using default of 0");
- }
-
- if (opt->fast_sync && !opt->allow_sync) {
- opt->fast_sync = 0;
- otp_log(OTP_LOG_INFO,
- "fast_sync is yes, but allow_sync is no; disabling fast_sync");
- }
-
- if (!opt->allow_sync && !opt->allow_async) {
- otp_log(OTP_LOG_ERR,
- "at least one of {allow_async, allow_sync} must be set");
- free(opt);
- return -1;
- }
-
- if ((opt->ewindow_size > OTP_MAX_EWINDOW_SIZE) ||
- (opt->ewindow_size < 0)) {
- opt->ewindow_size = 0;
- otp_log(OTP_LOG_ERR, "max ewindow_size is %d, using default of 0",
- OTP_MAX_EWINDOW_SIZE);
- }
-
- if (opt->ewindow2_size && (opt->ewindow2_size < opt->ewindow_size)) {
- opt->ewindow2_size = 0;
- otp_log(OTP_LOG_ERR, "ewindow2_size must be at least as large as "
- "ewindow_size, using default of 0");
- }
-
- if (opt->ewindow2_size && !opt->ewindow2_delay) {
- opt->ewindow2_size = 0;
- otp_log(OTP_LOG_ERR, "ewindow2_size is non-zero, "
- "but ewindow2_delay is zero; disabling ewindow2");
- }
-
- if ((opt->mschapv2_mppe_policy > 2) || (opt->mschapv2_mppe_policy < 0)) {
- opt->mschapv2_mppe_policy = 2;
- otp_log(OTP_LOG_ERR,
- "invalid value for mschapv2_mppe, using default of 2");
- }
-
- if ((opt->mschapv2_mppe_types > 2) || (opt->mschapv2_mppe_types < 0)) {
- opt->mschapv2_mppe_types = 2;
- otp_log(OTP_LOG_ERR,
- "invalid value for mschapv2_mppe_bits, using default of 2");
- }
-
- if ((opt->mschap_mppe_policy > 2) || (opt->mschap_mppe_policy < 0)) {
- opt->mschap_mppe_policy = 2;
- otp_log(OTP_LOG_ERR,
- "invalid value for mschap_mppe, using default of 2");
- }
-
- if (opt->mschap_mppe_types != 2) {
- opt->mschap_mppe_types = 2;
- otp_log(OTP_LOG_ERR,
- "invalid value for mschap_mppe_bits, using default of 2");
- }
-
-#if 0
- if (opt->twindow_max - opt->twindow_min > OTP_MAX_TWINDOW_SIZE) {
- opt->twindow_min = opt->twindow_max = 0;
- otp_log(OTP_LOG_ERR, "max time window size is %d, using default of 0",
- OTP_MAX_TWINDOW_SIZE);
- }
- if ((opt->twindow_min > 0) || (opt->twindow_max < 0) ||
- (opt->twindow_max < opt->twindow_min)) {
- opt->twindow_min = opt->twindow_max = 0;
- otp_log(OTP_LOG_ERR,
- "invalid values for time window, using default of 0");
- }
-#endif
-
- /* Set the instance name (for use with authorize()) */
- opt->name = cf_section_name2(conf);
- if (!opt->name)
- opt->name = cf_section_name1(conf);
- if (!opt->name) {
- otp_log(OTP_LOG_CRIT, "no instance name (this can't happen)");
- free(opt);
- return -1;
- }
-
- *instance = opt;
- return 0;
+ /*
+ * Don't do this again.
+ * Only the main thread instantiates and detaches instances,
+ * so this does not need mutex protection.
+ */
+ ninstance++;
+ }
+
+ /* Verify ranges for those vars that are limited. */
+ if ((opt->challenge_len < 5) ||
+ (opt->challenge_len > OTP_MAX_CHALLENGE_LEN)) {
+ opt->challenge_len = 6;
+ (void) radlog(L_ERR, "rlm_otp: %s: invalid challenge_length, range 5-%d, "
+ "using default of 6",
+ __func__, OTP_MAX_CHALLENGE_LEN);
+ }
+
+ /* Enforce a single "%" sequence, which must be "%s" */
+ p = strchr(opt->chal_prompt, '%');
+ if ((p == NULL) || (p != strrchr(opt->chal_prompt, '%')) ||
+ strncmp(p,"%s",2)) {
+ free(opt->chal_prompt);
+ opt->chal_prompt = strdup(OTP_CHALLENGE_PROMPT);
+ (void) radlog(L_ERR, "rlm_otp: %s: invalid challenge_prompt, "
+ "using default of \"%s\"",
+ __func__, OTP_CHALLENGE_PROMPT);
+ }
+
+ if (!opt->allow_sync && !opt->allow_async) {
+ (void) radlog(L_ERR, "rlm_otp: %s: at least one of "
+ "{allow_async, allow_sync} must be set",
+ __func__);
+ free(opt);
+ return -1;
+ }
+
+ if ((opt->mschapv2_mppe_policy > 2) || (opt->mschapv2_mppe_policy < 0)) {
+ opt->mschapv2_mppe_policy = 2;
+ (void) radlog(L_ERR, "rlm_otp: %s: invalid value for mschapv2_mppe, "
+ "using default of 2",
+ __func__);
+ }
+
+ if ((opt->mschapv2_mppe_types > 2) || (opt->mschapv2_mppe_types < 0)) {
+ opt->mschapv2_mppe_types = 2;
+ (void) radlog(L_ERR, "rlm_otp: %s: invalid value for mschapv2_mppe_bits, "
+ "using default of 2",
+ __func__);
+ }
+
+ if ((opt->mschap_mppe_policy > 2) || (opt->mschap_mppe_policy < 0)) {
+ opt->mschap_mppe_policy = 2;
+ (void) radlog(L_ERR, "rlm_otp: %s: invalid value for mschap_mppe, "
+ "using default of 2",
+ __func__);
+ }
+
+ if (opt->mschap_mppe_types != 2) {
+ opt->mschap_mppe_types = 2;
+ (void) radlog(L_ERR, "rlm_otp: %s: invalid value for mschap_mppe_bits, "
+ "using default of 2",
+ __func__);
+ }
+
+ /* set the instance name (for use with authorize()) */
+ opt->name = cf_section_name2(conf);
+ if (!opt->name)
+ opt->name = cf_section_name1(conf);
+ if (!opt->name) {
+ (void) radlog(L_ERR|L_CONS,
+ "rlm_otp: %s: no instance name (this can't happen)",
+ __func__);
+ free(opt);
+ return -1;
+ }
+
+ *instance = opt;
+ return 0;
}
static int
otp_authorize(void *instance, REQUEST *request)
{
- otp_option_t *inst = (otp_option_t *) instance;
-
- char challenge[OTP_MAX_CHALLENGE_LEN + 1]; /* +1 for '\0' terminator */
- char *state;
- int auth_type_found;
- int32_t sflags = 0; /* flags for state */
-
- struct otp_pwe_cmp_t data = {
- .request = request,
- .inst = inst,
- .returned_vps = NULL
- };
-
- /* Early exit if Auth-Type != inst->name */
- {
- VALUE_PAIR *vp;
-
- auth_type_found = 0;
- if ((vp = pairfind(request->config_items, PW_AUTHTYPE)) != NULL) {
- auth_type_found = 1;
- if (strcmp(vp->strvalue, inst->name)) {
- return RLM_MODULE_NOOP;
- }
- }
- }
+ otp_option_t *inst = (otp_option_t *) instance;
- /* The State attribute will be present if this is a response. */
- if (pairfind(request->packet->vps, PW_STATE) != NULL) {
- DEBUG("rlm_otp: autz: Found response to Access-Challenge");
- return RLM_MODULE_OK;
- }
-
- /* User-Name attribute required. */
- if (!request->username) {
- otp_log(OTP_LOG_AUTH,
- "autz: Attribute \"User-Name\" required for authentication.");
- return RLM_MODULE_INVALID;
- }
+ char challenge[OTP_MAX_CHALLENGE_LEN + 1]; /* +1 for '\0' terminator */
+ int auth_type_found;
+ otp_pwe_t pwe;
- if ((data.pwattr = otp_pwe_present(request)) == 0) {
- otp_log(OTP_LOG_AUTH, "autz: Attribute \"User-Password\" "
- "or equivalent required for authentication.");
- return RLM_MODULE_INVALID;
- }
+ /* Early exit if Auth-Type != inst->name */
+ {
+ VALUE_PAIR *vp;
- /* fast_sync mode (challenge only if requested) */
- if (inst->fast_sync) {
- if ((!otp_pwe_cmp(&data, inst->resync_req) &&
- /* Set a bit indicating resync */ (sflags |= htonl(1))) ||
- !otp_pwe_cmp(&data, inst->chal_req)) {
- /*
- * Generate a challenge if requested. Note that we do this
- * even if configuration doesn't allow async mode.
- */
- DEBUG("rlm_otp: autz: fast_sync challenge requested");
- goto gen_challenge;
-
- } else {
- /* Otherwise, this is the token sync response. */
- if (!auth_type_found)
- pairadd(&request->config_items,
- pairmake("Auth-Type", "otp", T_OP_EQ));
- return RLM_MODULE_OK;
-
- }
- } /* if (fast_sync && card supports sync mode) */
-
-gen_challenge:
- /* Set the resync bit by default if the user can't choose. */
- if (!inst->fast_sync)
- sflags |= htonl(1);
-
- /* Generate a random challenge. */
- if (otp_get_challenge(-1, challenge, inst->chal_len) == -1) {
- otp_log(OTP_LOG_ERR, "autz: failed to obtain random challenge");
- return RLM_MODULE_FAIL;
+ auth_type_found = 0;
+ if ((vp = pairfind(request->config_items, PW_AUTHTYPE)) != NULL) {
+ auth_type_found = 1;
+ if (strcmp(vp->strvalue, inst->name))
+ return RLM_MODULE_NOOP;
}
-
- /*
- * Create the State attribute, which will be returned to us along with
- * the response. We will need this to verify the response. It must
- * be hmac protected to prevent insertion of arbitrary State by an
- * inside attacker. If we won't actually use the State (server config
- * doesn't allow async), we just use a trivial State. We always create
- * at least a trivial State, so otp_authorize() can quickly pass on to
- * otp_authenticate().
- */
- if (inst->allow_async) {
- time_t now = time(NULL);
-
- if (sizeof(now) != 4 || sizeof(long) != 4) {
- otp_log(OTP_LOG_ERR, "autz: only ILP32 arch is supported");
- return RLM_MODULE_FAIL;
- }
- now = htonl(now);
-
- if (otp_gen_state(&state, NULL, challenge, sflags, now, hmac_key) != 0){
- otp_log(OTP_LOG_ERR, "autz: failed to generate state");
- return RLM_MODULE_FAIL;
- }
- } else {
- /* x2 b/c pairmake() string->octet needs even num of digits */
- state = rad_malloc(3 + inst->chal_len * 2);
- (void) sprintf(state, "0x%s%s", challenge, challenge);
+ }
+
+ /* The State attribute will be present if this is a response. */
+ if (pairfind(request->packet->vps, PW_STATE) != NULL) {
+ DEBUG("rlm_otp: autz: Found response to Access-Challenge");
+ return RLM_MODULE_OK;
+ }
+
+ /* User-Name attribute required. */
+ if (!request->username) {
+ (void) radlog(L_AUTH, "rlm_otp: %s: Attribute \"User-Name\" required "
+ "for authentication.",
+ __func__);
+ return RLM_MODULE_INVALID;
+ }
+
+ if ((pwe = otp_pwe_present(request)) == 0) {
+ (void) radlog(L_AUTH, "rlm_otp: %s: Attribute \"User-Password\" "
+ "or equivalent required for authentication.",
+ __func__);
+ return RLM_MODULE_INVALID;
+ }
+
+ /*
+ * We used to check for special "challenge" and "resync" passcodes
+ * here, but these are complicated to explain and application is
+ * limited. More importantly, since we've removed all actual OTP
+ * code (now we ask otpd), it's awkward for us to support them.
+ * Should the need arise to reinstate these options, the most likely
+ * choice is to duplicate some otpd code here.
+ */
+
+ if (inst->allow_sync && !inst->allow_async) {
+ /* This is the token sync response. */
+ if (!auth_type_found)
+ pairadd(&request->config_items,
+ pairmake("Auth-Type", inst->name, T_OP_EQ));
+ return RLM_MODULE_OK;
+ }
+
+ /* Generate a random challenge. */
+ otp_async_challenge(challenge, inst->challenge_len);
+
+ /*
+ * Create the State attribute, which will be returned to us along with
+ * the response. We will need this to verify the response. It must
+ * be hmac protected to prevent insertion of arbitrary State by an
+ * inside attacker. If we won't actually use the State (server config
+ * doesn't allow async), we just use a trivial State. We always create
+ * at least a trivial State, so otp_authorize() can quickly pass on to
+ * otp_authenticate().
+ */
+ {
+ int32_t now = htonl(time(NULL)); /* low-order 32 bits on LP64 */
+ char state[OTP_MAX_RADSTATE_LEN];
+
+ if (otp_gen_state(state, NULL, challenge, inst->challenge_len, 0,
+ now, hmac_key) != 0) {
+ (void) radlog(L_ERR, "rlm_otp: %s: failed to generate radstate",__func__);
+ return RLM_MODULE_FAIL;
}
pairadd(&request->reply->vps, pairmake("State", state, T_OP_EQ));
- free(state);
-
- /* Add the challenge to the reply. */
- {
- char *u_challenge; /* challenge with addt'l presentation text */
-
- u_challenge = rad_malloc(strlen(inst->chal_prompt) +
- OTP_MAX_CHALLENGE_LEN+1);
- (void) sprintf(u_challenge, inst->chal_prompt, challenge);
- pairadd(&request->reply->vps,
- pairmake("Reply-Message", u_challenge, T_OP_EQ));
- free(u_challenge);
- }
-
- /*
- * Mark the packet as an Access-Challenge packet.
- * The server will take care of sending it to the user.
- */
- request->reply->code = PW_ACCESS_CHALLENGE;
- DEBUG("rlm_otp: Sending Access-Challenge.");
-
- /* TODO: support config-specific auth-type */
- if (!auth_type_found)
- pairadd(&request->config_items,
- pairmake("Auth-Type", "otp", T_OP_EQ));
- return RLM_MODULE_HANDLED;
+ }
+
+ /* Add the challenge to the reply. */
+ {
+ char *u_challenge; /* challenge with addt'l presentation text */
+
+ u_challenge = rad_malloc(strlen(inst->chal_prompt) +
+ OTP_MAX_CHALLENGE_LEN + 1);
+ (void) sprintf(u_challenge, inst->chal_prompt, challenge);
+ pairadd(&request->reply->vps,
+ pairmake("Reply-Message", u_challenge, T_OP_EQ));
+ free(u_challenge);
+ }
+
+ /*
+ * Mark the packet as an Access-Challenge packet.
+ * The server will take care of sending it to the user.
+ */
+ request->reply->code = PW_ACCESS_CHALLENGE;
+ DEBUG("rlm_otp: Sending Access-Challenge.");
+
+ if (!auth_type_found)
+ pairadd(&request->config_items, pairmake("Auth-Type", inst->name, T_OP_EQ));
+ return RLM_MODULE_HANDLED;
}
static int
otp_authenticate(void *instance, REQUEST *request)
{
- otp_option_t *inst = (otp_option_t *) instance;
-
- char *username;
- int rc;
- int resync = 0; /* resync flag for async mode */
-
- char challenge[OTP_MAX_CHALLENGE_LEN + 1];
- VALUE_PAIR *add_vps = NULL;
-
- struct otp_pwe_cmp_t data = {
- .request = request,
- .inst = inst,
- .returned_vps = &add_vps
- };
-
- /* User-Name attribute required. */
- if (!request->username) {
- otp_log(OTP_LOG_AUTH,
- "auth: Attribute \"User-Name\" required for authentication.");
- return RLM_MODULE_INVALID;
+ otp_option_t *inst = (otp_option_t *) instance;
+
+ char *username;
+ int rc;
+ otp_pwe_t pwe;
+ VALUE_PAIR *vp;
+ unsigned char challenge[OTP_MAX_CHALLENGE_LEN]; /* cf. authorize() */
+ char passcode[OTP_MAX_PASSCODE_LEN + 1];
+
+ challenge[0] = '\0'; /* initialize for otp_pw_valid() */
+
+ /* User-Name attribute required. */
+ if (!request->username) {
+ (void) radlog(L_AUTH, "rlm_otp: %s: Attribute \"User-Name\" required "
+ "for authentication.",
+ __func__);
+ return RLM_MODULE_INVALID;
+ }
+ username = request->username->strvalue;
+
+ if ((pwe = otp_pwe_present(request)) == 0) {
+ (void) radlog(L_AUTH, "rlm_otp: %s: Attribute \"User-Password\" "
+ "or equivalent required for authentication.",
+ __func__);
+ return RLM_MODULE_INVALID;
+ }
+
+ /* Add a message to the auth log. */
+ pairadd(&request->packet->vps, pairmake("Module-Failure-Message",
+ "rlm_otp", T_OP_EQ));
+ pairadd(&request->packet->vps, pairmake("Module-Success-Message",
+ "rlm_otp", T_OP_EQ));
+
+ /* Retrieve the challenge (from State attribute). */
+ if ((vp = pairfind(request->packet->vps, PW_STATE)) != NULL) {
+ unsigned char state[OTP_MAX_RADSTATE_LEN];
+ unsigned char raw_state[OTP_MAX_RADSTATE_LEN];
+ unsigned char rad_state[OTP_MAX_RADSTATE_LEN];
+ int32_t then; /* state timestamp */
+ int e_length; /* expected State length */
+
+ /* set expected State length */
+ e_length = inst->challenge_len * 2 + 8 + 8 + 32; /* see otp_gen_state() */
+
+ if (vp->length != e_length) {
+ (void) radlog(L_AUTH, "rlm_otp: %s: bad radstate for [%s]: length",
+ __func__, username);
+ return RLM_MODULE_INVALID;
+ }
+
+ /*
+ * Verify the state.
+ */
+
+ /* ASCII decode; this is why OTP_MAX_RADSTATE_LEN has +1 */
+ (void) memcpy(rad_state, vp->strvalue, vp->length);
+ rad_state[e_length] = '\0';
+ if (otp_a2x(rad_state, raw_state) == -1) {
+ (void) radlog(L_AUTH, "rlm_otp: %s: bad radstate for [%s]: not hex",
+ __func__, username);
+ return RLM_MODULE_INVALID;
}
- username = request->username->strvalue;
- if ((data.pwattr = otp_pwe_present(request)) == 0) {
- otp_log(OTP_LOG_AUTH, "auth: Attribute \"User-Password\" "
- "or equivalent required for authentication.");
- return RLM_MODULE_INVALID;
+ /* extract data from State */
+ (void) memcpy(challenge, raw_state, inst->challenge_len);
+ /* skip flag data */
+ (void) memcpy(&then, raw_state + inst->challenge_len + 4, 4);
+
+ /* generate new state from returned input data */
+ if (otp_gen_state(NULL, state, challenge, inst->challenge_len, 0,
+ then, hmac_key) != 0) {
+ (void) radlog(L_ERR, "rlm_otp: %s: failed to generate radstate",
+ __func__);
+ return RLM_MODULE_FAIL;
+ }
+ /* compare generated state against returned state to verify hmac */
+ if (memcmp(state, vp->strvalue, vp->length)) {
+ (void) radlog(L_AUTH, "rlm_otp: %s: bad radstate for [%s]: hmac",
+ __func__, username);
+ return RLM_MODULE_REJECT;
}
- /* Add a message to the auth log. */
- pairadd(&request->packet->vps, pairmake("Module-Failure-Message",
- OTP_MODULE_NAME, T_OP_EQ));
- pairadd(&request->packet->vps, pairmake("Module-Success-Message",
- OTP_MODULE_NAME, T_OP_EQ));
-
- /* Retrieve the challenge (from State attribute). */
- challenge[0] = '\0';
- {
- VALUE_PAIR *vp;
- unsigned char *state;
- int32_t sflags = 0; /* state flags */
- time_t then; /* state timestamp */
-
- if ((vp = pairfind(request->packet->vps, PW_STATE)) != NULL) {
- int e_length = inst->chal_len;
-
- /* Extend expected length if state should have been protected. */
- if (inst->allow_async)
- e_length += 4 + 4 + 16; /* sflags + time + hmac */
-
- if (vp->length != e_length) {
- otp_log(OTP_LOG_AUTH,
- "auth: bad state for [%s]: length", username);
- return RLM_MODULE_INVALID;
- }
-
- if (inst->allow_async) {
- /* Verify the state. */
- (void) memset(challenge, 0, sizeof(challenge));
- (void) memcpy(challenge, vp->strvalue, inst->chal_len);
- (void) memcpy(&sflags, vp->strvalue + inst->chal_len, 4);
- (void) memcpy(&then, vp->strvalue + inst->chal_len + 4, 4);
- if (otp_gen_state(NULL, &state, challenge,
- sflags, then, hmac_key) != 0) {
- otp_log(OTP_LOG_ERR, "auth: failed to generate state");
- return RLM_MODULE_FAIL;
- }
- if (memcmp(state, vp->strvalue, vp->length)) {
- otp_log(OTP_LOG_AUTH,
- "auth: bad state for [%s]: hmac", username);
- free(state);
- return RLM_MODULE_REJECT;
- }
- free(state);
-
- /* State is valid, but check expiry. */
- then = ntohl(then);
- if (time(NULL) - then > inst->chal_delay) {
- otp_log(OTP_LOG_AUTH,
- "auth: bad state for [%s]: expired", username);
- return RLM_MODULE_REJECT;
- }
- resync = ntohl(sflags) & 1;
- } /* if (State should have been protected) */
- } /* if (State present) */
- } /* code block */
-
- /* do it */
- rc = otprc2rlmrc(otp_pw_valid(username, challenge, NULL, resync, inst,
- otp_pwe_cmp, &data, "auth"));
-
- /* Handle any vps returned from otp_pwe_cmp(). */
- if (rc == RLM_MODULE_OK) {
- pairadd(&request->reply->vps, add_vps);
- } else {
- pairfree(&add_vps);
+ /* State is valid, but check expiry. */
+ then = ntohl(then);
+ if (time(NULL) - then > inst->challenge_delay) {
+ (void) radlog(L_AUTH, "rlm_otp: %s: bad radstate for [%s]: expired",
+ __func__, username);
+ return RLM_MODULE_REJECT;
}
- return rc;
+ } /* if (State present) */
+
+ /* do it */
+ rc = otp_pw_valid(request, pwe, challenge, inst, passcode);
+
+ /* Add MPPE data as needed. */
+ if (rc == RLM_MODULE_OK)
+ otp_mppe(request, pwe, inst, passcode);
+
+ return rc;
}
static int
otp_detach(void *instance)
{
- otp_option_t *inst = (otp_option_t *) instance;
-
- free(inst->pwdfile);
- free(inst->syncdir);
- free(inst->chal_prompt);
- free(inst->chal_req);
- free(inst->resync_req);
- free(instance);
- /*
- * Only the main thread instantiates and detaches instances,
- * so this does not need mutex protection.
- */
- if (--ninstance == 0)
- memset(hmac_key, 0, sizeof(hmac_key));
-
- return 0;
+ otp_option_t *inst = (otp_option_t *) instance;
+
+ free(inst->otpd_rp);
+ free(inst->chal_prompt);
+ free(instance);
+ /*
+ * Only the main thread instantiates and detaches instances,
+ * so this does not need mutex protection.
+ */
+ if (--ninstance == 0)
+ (void) memset(hmac_key, 0, sizeof(hmac_key));
+
+ return 0;
}
* is single-threaded.
*/
module_t rlm_otp = {
- RLM_MODULE_INIT,
- "otp",
- RLM_TYPE_THREAD_SAFE, /* type */
- otp_instantiate, /* instantiation */
- {
- otp_authenticate, /* authentication */
- otp_authorize, /* authorization */
- NULL, /* preaccounting */
- NULL, /* accounting */
- NULL, /* checksimul */
- NULL, /* pre-proxy */
- NULL, /* post-proxy */
- NULL /* post-auth */
- },
- otp_detach, /* detach */
+ "otp",
+ RLM_TYPE_THREAD_SAFE, /* type */
+ NULL,
+ otp_instantiate, /* instantiation */
+ {
+ otp_authenticate, /* authentication */
+ otp_authorize, /* authorization */
+ NULL, /* preaccounting */
+ NULL, /* accounting */
+ NULL, /* checksimul */
+ NULL, /* pre-proxy */
+ NULL, /* post-proxy */
+ NULL /* post-auth */
+ },
+ otp_detach, /* detach */
+ NULL,
};
projects / freeradius.git / blobdiff