/* $OpenBSD: ike_quick_mode.c,v 1.107 2011/12/12 07:35:29 yasuoka Exp $ */ /* $EOM: ike_quick_mode.c,v 1.139 2001/01/26 10:43:17 niklas Exp $ */ /* * Copyright (c) 1998, 1999, 2000, 2001 Niklas Hallqvist. All rights reserved. * Copyright (c) 1999, 2000, 2001 Angelos D. Keromytis. All rights reserved. * Copyright (c) 2000, 2001, 2004 Håkan Olsson. All rights reserved. * * 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 ``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 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. */ /* * This code was written under funding by Ericsson Radio Systems. */ #include #include #include #include #include #include "attribute.h" #include "conf.h" #include "connection.h" #include "dh.h" #include "doi.h" #include "exchange.h" #include "hash.h" #include "ike_quick_mode.h" #include "ipsec.h" #include "log.h" #include "message.h" #include "policy.h" #include "prf.h" #include "sa.h" #include "transport.h" #include "util.h" #include "key.h" #include "x509.h" static void gen_g_xy(struct message *); static int initiator_send_HASH_SA_NONCE(struct message *); static int initiator_recv_HASH_SA_NONCE(struct message *); static int initiator_send_HASH(struct message *); static void post_quick_mode(struct message *); static int responder_recv_HASH_SA_NONCE(struct message *); static int responder_send_HASH_SA_NONCE(struct message *); static int responder_recv_HASH(struct message *); static int check_policy(struct exchange *, struct sa *, struct sa *); int (*ike_quick_mode_initiator[])(struct message *) = { initiator_send_HASH_SA_NONCE, initiator_recv_HASH_SA_NONCE, initiator_send_HASH }; int (*ike_quick_mode_responder[])(struct message *) = { responder_recv_HASH_SA_NONCE, responder_send_HASH_SA_NONCE, responder_recv_HASH }; /* How many return values will policy handle -- true/false for now */ #define RETVALUES_NUM 2 /* * Given an exchange and our policy, check whether the SA and IDs are * acceptable. */ static int check_policy(struct exchange *exchange, struct sa *sa, struct sa *isakmp_sa) { char *return_values[RETVALUES_NUM]; char **principal = 0; int i, len, result = 0, nprinc = 0; int *x509_ids = 0, *keynote_ids = 0; unsigned char hashbuf[20]; /* Set to the largest digest result */ struct keynote_deckey dc; X509_NAME *subject; /* Do we want to use keynote policies? */ if (ignore_policy || strncmp("yes", conf_get_str("General", "Use-Keynote"), 3)) return 1; /* Initialize if necessary -- e.g., if pre-shared key auth was used */ if (isakmp_sa->policy_id < 0) { if ((isakmp_sa->policy_id = kn_init()) == -1) { log_print("check_policy: " "failed to initialize policy session"); return 0; } } /* Add the callback that will handle attributes. */ if (kn_add_action(isakmp_sa->policy_id, ".*", (char *)policy_callback, ENVIRONMENT_FLAG_FUNC | ENVIRONMENT_FLAG_REGEX) == -1) { log_print("check_policy: " "kn_add_action (%d, \".*\", %p, FUNC | REGEX) failed", isakmp_sa->policy_id, policy_callback); kn_close(isakmp_sa->policy_id); isakmp_sa->policy_id = -1; return 0; } if (policy_asserts_num) { keynote_ids = calloc(policy_asserts_num, sizeof *keynote_ids); if (!keynote_ids) { log_error("check_policy: calloc (%d, %lu) failed", policy_asserts_num, (unsigned long)sizeof *keynote_ids); kn_close(isakmp_sa->policy_id); isakmp_sa->policy_id = -1; return 0; } } /* Add the policy assertions */ for (i = 0; i < policy_asserts_num; i++) keynote_ids[i] = kn_add_assertion(isakmp_sa->policy_id, policy_asserts[i], strlen(policy_asserts[i]), ASSERT_FLAG_LOCAL); /* Initialize -- we'll let the callback do all the work. */ policy_exchange = exchange; policy_sa = sa; policy_isakmp_sa = isakmp_sa; /* Set the return values; true/false for now at least. */ return_values[0] = "false"; /* Order of values in array is * important. */ return_values[1] = "true"; /* Create a principal (authorizer) for the SA/ID request. */ switch (isakmp_sa->recv_certtype) { case ISAKMP_CERTENC_NONE: /* * For shared keys, just duplicate the passphrase with the * appropriate prefix tag. */ nprinc = 3; principal = calloc(nprinc, sizeof *principal); if (!principal) { log_error("check_policy: calloc (%d, %lu) failed", nprinc, (unsigned long)sizeof *principal); goto policydone; } len = strlen(isakmp_sa->recv_key) + sizeof "passphrase:"; principal[0] = calloc(len, sizeof(char)); if (!principal[0]) { log_error("check_policy: calloc (%d, %lu) failed", len, (unsigned long)sizeof(char)); goto policydone; } /* * XXX Consider changing the magic hash lengths with * constants. */ strlcpy(principal[0], "passphrase:", len); memcpy(principal[0] + sizeof "passphrase:" - 1, isakmp_sa->recv_key, strlen(isakmp_sa->recv_key)); len = sizeof "passphrase-md5-hex:" + 2 * 16; principal[1] = calloc(len, sizeof(char)); if (!principal[1]) { log_error("check_policy: calloc (%d, %lu) failed", len, (unsigned long)sizeof(char)); goto policydone; } strlcpy(principal[1], "passphrase-md5-hex:", len); MD5(isakmp_sa->recv_key, strlen(isakmp_sa->recv_key), hashbuf); for (i = 0; i < 16; i++) snprintf(principal[1] + 2 * i + sizeof "passphrase-md5-hex:" - 1, 3, "%02x", hashbuf[i]); len = sizeof "passphrase-sha1-hex:" + 2 * 20; principal[2] = calloc(len, sizeof(char)); if (!principal[2]) { log_error("check_policy: calloc (%d, %lu) failed", len, (unsigned long)sizeof(char)); goto policydone; } strlcpy(principal[2], "passphrase-sha1-hex:", len); SHA1(isakmp_sa->recv_key, strlen(isakmp_sa->recv_key), hashbuf); for (i = 0; i < 20; i++) snprintf(principal[2] + 2 * i + sizeof "passphrase-sha1-hex:" - 1, 3, "%02x", hashbuf[i]); break; case ISAKMP_CERTENC_KEYNOTE: nprinc = 1; principal = calloc(nprinc, sizeof *principal); if (!principal) { log_error("check_policy: calloc (%d, %lu) failed", nprinc, (unsigned long)sizeof *principal); goto policydone; } /* Dup the keys */ principal[0] = strdup(isakmp_sa->keynote_key); if (!principal[0]) { log_error("check_policy: calloc (%lu, %lu) failed", (unsigned long)strlen(isakmp_sa->keynote_key), (unsigned long)sizeof(char)); goto policydone; } break; case ISAKMP_CERTENC_X509_SIG: principal = calloc(2, sizeof *principal); if (!principal) { log_error("check_policy: calloc (2, %lu) failed", (unsigned long)sizeof *principal); goto policydone; } if (isakmp_sa->recv_keytype == ISAKMP_KEY_RSA) dc.dec_algorithm = KEYNOTE_ALGORITHM_RSA; else { log_error("check_policy: " "unknown/unsupported public key algorithm %d", isakmp_sa->recv_keytype); goto policydone; } dc.dec_key = isakmp_sa->recv_key; principal[0] = kn_encode_key(&dc, INTERNAL_ENC_PKCS1, ENCODING_HEX, KEYNOTE_PUBLIC_KEY); if (keynote_errno == ERROR_MEMORY) { log_print("check_policy: " "failed to get memory for public key"); goto policydone; } if (!principal[0]) { log_print("check_policy: " "failed to allocate memory for principal"); goto policydone; } if (asprintf(&principal[1], "rsa-hex:%s", principal[0]) == -1) { log_error("check_policy: asprintf() failed"); goto policydone; } free(principal[0]); principal[0] = principal[1]; principal[1] = 0; /* Generate a "DN:" principal. */ subject = X509_get_subject_name(isakmp_sa->recv_cert); if (subject) { principal[1] = calloc(259, sizeof(char)); if (!principal[1]) { log_error("check_policy: " "calloc (259, %lu) failed", (unsigned long)sizeof(char)); goto policydone; } strlcpy(principal[1], "DN:", 259); X509_NAME_oneline(subject, principal[1] + 3, 256); nprinc = 2; } else { nprinc = 1; } break; /* XXX Eventually handle these. */ case ISAKMP_CERTENC_PKCS: case ISAKMP_CERTENC_PGP: case ISAKMP_CERTENC_DNS: case ISAKMP_CERTENC_X509_KE: case ISAKMP_CERTENC_KERBEROS: case ISAKMP_CERTENC_CRL: case ISAKMP_CERTENC_ARL: case ISAKMP_CERTENC_SPKI: case ISAKMP_CERTENC_X509_ATTR: default: log_print("check_policy: " "unknown/unsupported certificate/authentication method %d", isakmp_sa->recv_certtype); goto policydone; } /* * Add the authorizer (who is requesting the SA/ID); * this may be a public or a secret key, depending on * what mode of authentication we used in Phase 1. */ for (i = 0; i < nprinc; i++) { LOG_DBG((LOG_POLICY, 40, "check_policy: " "adding authorizer [%s]", principal[i])); if (kn_add_authorizer(isakmp_sa->policy_id, principal[i]) == -1) { int j; for (j = 0; j < i; j++) kn_remove_authorizer(isakmp_sa->policy_id, principal[j]); log_print("check_policy: kn_add_authorizer failed"); goto policydone; } } /* Ask policy */ result = kn_do_query(isakmp_sa->policy_id, return_values, RETVALUES_NUM); LOG_DBG((LOG_POLICY, 40, "check_policy: kn_do_query returned %d", result)); /* Cleanup environment */ kn_cleanup_action_environment(isakmp_sa->policy_id); /* Remove authorizers from the session */ for (i = 0; i < nprinc; i++) { kn_remove_authorizer(isakmp_sa->policy_id, principal[i]); free(principal[i]); } free(principal); principal = 0; nprinc = 0; /* Check what policy said. */ if (result < 0) { LOG_DBG((LOG_POLICY, 40, "check_policy: proposal refused")); result = 0; goto policydone; } policydone: for (i = 0; i < nprinc; i++) if (principal && principal[i]) free(principal[i]); free(principal); /* Remove the policies */ for (i = 0; i < policy_asserts_num; i++) { if (keynote_ids[i] != -1) kn_remove_assertion(isakmp_sa->policy_id, keynote_ids[i]); } free(keynote_ids); free(x509_ids); /* * XXX Currently, check_policy() is only called from * message_negotiate_sa(), and so this log message reflects this. * Change to something better? */ if (result == 0) log_print("check_policy: negotiated SA failed policy check"); /* * Given that we have only 2 return values from policy (true/false) * we can just return the query result directly (no pre-processing * needed). */ return result; } /* * Offer several sets of transforms to the responder. * XXX Split this huge function up and look for common code with main mode. */ static int initiator_send_HASH_SA_NONCE(struct message *msg) { struct exchange *exchange = msg->exchange; struct doi *doi = exchange->doi; struct ipsec_exch *ie = exchange->data; u_int8_t ***transform = 0, ***new_transform; u_int8_t **proposal = 0, **new_proposal; u_int8_t *sa_buf = 0, *attr, *saved_nextp_sa, *saved_nextp_prop, *id, *spi; size_t spi_sz, sz; size_t proposal_len = 0, proposals_len = 0, sa_len; size_t **transform_len = 0, **new_transform_len; size_t *transforms_len = 0, *new_transforms_len; u_int32_t *transform_cnt = 0, *new_transform_cnt; u_int32_t suite_no, prop_no, prot_no, xf_no, prop_cnt = 0; u_int32_t i; int value, update_nextp, protocol_num, proto_id; struct proto *proto; struct conf_list *suite_conf, *prot_conf = 0, *xf_conf = 0, *life_conf; struct conf_list_node *suite, *prot, *xf, *life; struct constant_map *id_map; char *protocol_id, *transform_id; char *local_id, *remote_id; int group_desc = -1, new_group_desc; struct ipsec_sa *isa = msg->isakmp_sa->data; struct hash *hash = hash_get(isa->hash); struct sockaddr *src; struct proto_attr *pa; if (!ipsec_add_hash_payload(msg, hash->hashsize)) return -1; /* Get the list of protocol suites. */ suite_conf = conf_get_list(exchange->policy, "Suites"); if (!suite_conf) return -1; for (suite = TAILQ_FIRST(&suite_conf->fields), suite_no = prop_no = 0; suite_no < suite_conf->cnt; suite_no++, suite = TAILQ_NEXT(suite, link)) { /* Now get each protocol in this specific protocol suite. */ prot_conf = conf_get_list(suite->field, "Protocols"); if (!prot_conf) goto bail_out; for (prot = TAILQ_FIRST(&prot_conf->fields), prot_no = 0; prot_no < prot_conf->cnt; prot_no++, prot = TAILQ_NEXT(prot, link)) { /* Make sure we have a proposal/transform vectors. */ if (prop_no >= prop_cnt) { /* * This resize algorithm is completely * arbitrary. */ prop_cnt = 2 * prop_cnt + 10; new_proposal = realloc(proposal, prop_cnt * sizeof *proposal); if (!new_proposal) { log_error( "initiator_send_HASH_SA_NONCE: " "realloc (%p, %lu) failed", proposal, prop_cnt * (unsigned long)sizeof *proposal); goto bail_out; } proposal = new_proposal; new_transforms_len = realloc(transforms_len, prop_cnt * sizeof *transforms_len); if (!new_transforms_len) { log_error( "initiator_send_HASH_SA_NONCE: " "realloc (%p, %lu) failed", transforms_len, prop_cnt * (unsigned long)sizeof *transforms_len); goto bail_out; } transforms_len = new_transforms_len; new_transform = realloc(transform, prop_cnt * sizeof *transform); if (!new_transform) { log_error( "initiator_send_HASH_SA_NONCE: " "realloc (%p, %lu) failed", transform, prop_cnt * (unsigned long)sizeof *transform); goto bail_out; } transform = new_transform; new_transform_cnt = realloc(transform_cnt, prop_cnt * sizeof *transform_cnt); if (!new_transform_cnt) { log_error( "initiator_send_HASH_SA_NONCE: " "realloc (%p, %lu) failed", transform_cnt, prop_cnt * (unsigned long)sizeof *transform_cnt); goto bail_out; } transform_cnt = new_transform_cnt; new_transform_len = realloc(transform_len, prop_cnt * sizeof *transform_len); if (!new_transform_len) { log_error( "initiator_send_HASH_SA_NONCE: " "realloc (%p, %lu) failed", transform_len, prop_cnt * (unsigned long)sizeof *transform_len); goto bail_out; } transform_len = new_transform_len; } protocol_id = conf_get_str(prot->field, "PROTOCOL_ID"); if (!protocol_id) goto bail_out; proto_id = constant_value(ipsec_proto_cst, protocol_id); switch (proto_id) { case IPSEC_PROTO_IPSEC_AH: id_map = ipsec_ah_cst; break; case IPSEC_PROTO_IPSEC_ESP: id_map = ipsec_esp_cst; break; case IPSEC_PROTO_IPCOMP: id_map = ipsec_ipcomp_cst; break; default: { log_print("initiator_send_HASH_SA_NONCE: " "invalid PROTCOL_ID: %s", protocol_id); goto bail_out; } } /* Now get each transform we offer for this protocol.*/ xf_conf = conf_get_list(prot->field, "Transforms"); if (!xf_conf) goto bail_out; transform_cnt[prop_no] = xf_conf->cnt; transform[prop_no] = calloc(transform_cnt[prop_no], sizeof **transform); if (!transform[prop_no]) { log_error("initiator_send_HASH_SA_NONCE: " "calloc (%d, %lu) failed", transform_cnt[prop_no], (unsigned long)sizeof **transform); goto bail_out; } transform_len[prop_no] = calloc(transform_cnt[prop_no], sizeof **transform_len); if (!transform_len[prop_no]) { log_error("initiator_send_HASH_SA_NONCE: " "calloc (%d, %lu) failed", transform_cnt[prop_no], (unsigned long)sizeof **transform_len); goto bail_out; } transforms_len[prop_no] = 0; for (xf = TAILQ_FIRST(&xf_conf->fields), xf_no = 0; xf_no < transform_cnt[prop_no]; xf_no++, xf = TAILQ_NEXT(xf, link)) { /* XXX The sizing needs to be dynamic. */ transform[prop_no][xf_no] = calloc(ISAKMP_TRANSFORM_SA_ATTRS_OFF + 9 * ISAKMP_ATTR_VALUE_OFF, 1); if (!transform[prop_no][xf_no]) { log_error( "initiator_send_HASH_SA_NONCE: " "calloc (%d, 1) failed", ISAKMP_TRANSFORM_SA_ATTRS_OFF + 9 * ISAKMP_ATTR_VALUE_OFF); goto bail_out; } SET_ISAKMP_TRANSFORM_NO(transform[prop_no][xf_no], xf_no + 1); transform_id = conf_get_str(xf->field, "TRANSFORM_ID"); if (!transform_id) goto bail_out; SET_ISAKMP_TRANSFORM_ID(transform[prop_no][xf_no], constant_value(id_map, transform_id)); SET_ISAKMP_TRANSFORM_RESERVED(transform[prop_no][xf_no], 0); attr = transform[prop_no][xf_no] + ISAKMP_TRANSFORM_SA_ATTRS_OFF; /* * Life durations are special, we should be * able to specify several, one per type. */ life_conf = conf_get_list(xf->field, "Life"); if (life_conf) { for (life = TAILQ_FIRST(&life_conf->fields); life; life = TAILQ_NEXT(life, link)) { attribute_set_constant( life->field, "LIFE_TYPE", ipsec_duration_cst, IPSEC_ATTR_SA_LIFE_TYPE, &attr); /* * XXX Deals with 16 and 32 * bit lifetimes only */ value = conf_get_num(life->field, "LIFE_DURATION", 0); if (value) { if (value <= 0xffff) attr = attribute_set_basic( attr, IPSEC_ATTR_SA_LIFE_DURATION, value); else { value = htonl(value); attr = attribute_set_var( attr, IPSEC_ATTR_SA_LIFE_DURATION, (u_int8_t *)&value, sizeof value); } } } conf_free_list(life_conf); } attribute_set_constant(xf->field, "ENCAPSULATION_MODE", ipsec_encap_cst, IPSEC_ATTR_ENCAPSULATION_MODE, &attr); if (proto_id != IPSEC_PROTO_IPCOMP) { attribute_set_constant(xf->field, "AUTHENTICATION_ALGORITHM", ipsec_auth_cst, IPSEC_ATTR_AUTHENTICATION_ALGORITHM, &attr); attribute_set_constant(xf->field, "GROUP_DESCRIPTION", ike_group_desc_cst, IPSEC_ATTR_GROUP_DESCRIPTION, &attr); value = conf_get_num(xf->field, "KEY_LENGTH", 0); if (value) attr = attribute_set_basic( attr, IPSEC_ATTR_KEY_LENGTH, value); value = conf_get_num(xf->field, "KEY_ROUNDS", 0); if (value) attr = attribute_set_basic( attr, IPSEC_ATTR_KEY_ROUNDS, value); } else { value = conf_get_num(xf->field, "COMPRESS_DICTIONARY_SIZE", 0); if (value) attr = attribute_set_basic( attr, IPSEC_ATTR_COMPRESS_DICTIONARY_SIZE, value); value = conf_get_num(xf->field, "COMPRESS_PRIVATE_ALGORITHM", 0); if (value) attr = attribute_set_basic( attr, IPSEC_ATTR_COMPRESS_PRIVATE_ALGORITHM, value); } value = conf_get_num(xf->field, "ECN_TUNNEL", 0); if (value) attr = attribute_set_basic(attr, IPSEC_ATTR_ECN_TUNNEL, value); /* Record the real transform size. */ transforms_len[prop_no] += (transform_len[prop_no][xf_no] = attr - transform[prop_no][xf_no]); if (proto_id != IPSEC_PROTO_IPCOMP) { /* * Make sure that if a group * description is specified, it is * specified for all transforms * equally. */ attr = (u_int8_t *)conf_get_str(xf->field, "GROUP_DESCRIPTION"); new_group_desc = attr ? constant_value(ike_group_desc_cst, (char *)attr) : 0; if (group_desc == -1) group_desc = new_group_desc; else if (group_desc != new_group_desc) { log_print("initiator_send_HASH_SA_NONCE: " "differing group descriptions in a proposal"); goto bail_out; } } } conf_free_list(xf_conf); xf_conf = 0; /* * Get SPI from application. * XXX Should we care about unknown constants? */ protocol_num = constant_value(ipsec_proto_cst, protocol_id); spi = doi->get_spi(&spi_sz, protocol_num, msg); if (spi_sz && !spi) { log_print("initiator_send_HASH_SA_NONCE: " "doi->get_spi failed"); goto bail_out; } proposal_len = ISAKMP_PROP_SPI_OFF + spi_sz; proposals_len += proposal_len + transforms_len[prop_no]; proposal[prop_no] = malloc(proposal_len); if (!proposal[prop_no]) { log_error("initiator_send_HASH_SA_NONCE: " "malloc (%lu) failed", (unsigned long)proposal_len); goto bail_out; } SET_ISAKMP_PROP_NO(proposal[prop_no], suite_no + 1); SET_ISAKMP_PROP_PROTO(proposal[prop_no], protocol_num); /* XXX I would like to see this factored out. */ proto = calloc(1, sizeof *proto); if (!proto) { log_error("initiator_send_HASH_SA_NONCE: " "calloc (1, %lu) failed", (unsigned long)sizeof *proto); goto bail_out; } if (doi->proto_size) { proto->data = calloc(1, doi->proto_size); if (!proto->data) { free(proto); log_error( "initiator_send_HASH_SA_NONCE: " "calloc (1, %lu) failed", (unsigned long)doi->proto_size); goto bail_out; } } proto->no = suite_no + 1; proto->proto = protocol_num; proto->sa = TAILQ_FIRST(&exchange->sa_list); proto->xf_cnt = transform_cnt[prop_no]; TAILQ_INIT(&proto->xfs); for (xf_no = 0; xf_no < proto->xf_cnt; xf_no++) { pa = (struct proto_attr *)calloc(1, sizeof *pa); if (!pa) { if (proto->data) free(proto->data); free(proto); goto bail_out; } pa->len = transform_len[prop_no][xf_no]; pa->attrs = (u_int8_t *)malloc(pa->len); if (!pa->attrs) { if (proto->data) free(proto->data); free(proto); free(pa); goto bail_out; } memcpy(pa->attrs, transform[prop_no][xf_no], pa->len); TAILQ_INSERT_TAIL(&proto->xfs, pa, next); } TAILQ_INSERT_TAIL(&TAILQ_FIRST(&exchange->sa_list)->protos, proto, link); /* Setup the incoming SPI. */ SET_ISAKMP_PROP_SPI_SZ(proposal[prop_no], spi_sz); memcpy(proposal[prop_no] + ISAKMP_PROP_SPI_OFF, spi, spi_sz); proto->spi_sz[1] = spi_sz; proto->spi[1] = spi; /* * Let the DOI get at proto for initializing its own * data. */ if (doi->proto_init) doi->proto_init(proto, prot->field); SET_ISAKMP_PROP_NTRANSFORMS(proposal[prop_no], transform_cnt[prop_no]); prop_no++; } conf_free_list(prot_conf); prot_conf = 0; } sa_len = ISAKMP_SA_SIT_OFF + IPSEC_SIT_SIT_LEN; sa_buf = malloc(sa_len); if (!sa_buf) { log_error("initiator_send_HASH_SA_NONCE: malloc (%lu) failed", (unsigned long)sa_len); goto bail_out; } SET_ISAKMP_SA_DOI(sa_buf, IPSEC_DOI_IPSEC); SET_IPSEC_SIT_SIT(sa_buf + ISAKMP_SA_SIT_OFF, IPSEC_SIT_IDENTITY_ONLY); /* * Add the payloads. As this is a SA, we need to recompute the * lengths of the payloads containing others. We also need to * reset these payload's "next payload type" field. */ if (message_add_payload(msg, ISAKMP_PAYLOAD_SA, sa_buf, sa_len, 1)) goto bail_out; SET_ISAKMP_GEN_LENGTH(sa_buf, sa_len + proposals_len); sa_buf = 0; update_nextp = 0; saved_nextp_sa = msg->nextp; for (i = 0; i < prop_no; i++) { if (message_add_payload(msg, ISAKMP_PAYLOAD_PROPOSAL, proposal[i], proposal_len, update_nextp)) goto bail_out; SET_ISAKMP_GEN_LENGTH(proposal[i], proposal_len + transforms_len[i]); proposal[i] = 0; update_nextp = 0; saved_nextp_prop = msg->nextp; for (xf_no = 0; xf_no < transform_cnt[i]; xf_no++) { if (message_add_payload(msg, ISAKMP_PAYLOAD_TRANSFORM, transform[i][xf_no], transform_len[i][xf_no], update_nextp)) goto bail_out; update_nextp = 1; transform[i][xf_no] = 0; } msg->nextp = saved_nextp_prop; update_nextp = 1; } msg->nextp = saved_nextp_sa; /* * Save SA payload body in ie->sa_i_b, length ie->sa_i_b_len. */ ie->sa_i_b = message_copy(msg, ISAKMP_GEN_SZ, &ie->sa_i_b_len); if (!ie->sa_i_b) goto bail_out; /* * Generate a nonce, and add it to the message. * XXX I want a better way to specify the nonce's size. */ if (exchange_gen_nonce(msg, 16)) return -1; /* Generate optional KEY_EXCH payload. */ if (group_desc > 0) { ie->group = group_get(group_desc); ie->g_x_len = dh_getlen(ie->group); if (ipsec_gen_g_x(msg)) { group_free(ie->group); ie->group = 0; return -1; } } /* Generate optional client ID payloads. XXX Share with responder. */ local_id = conf_get_str(exchange->name, "Local-ID"); remote_id = conf_get_str(exchange->name, "Remote-ID"); if (local_id && remote_id) { id = ipsec_build_id(local_id, &sz); if (!id) return -1; LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH_SA_NONCE: IDic", id, sz)); if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { free(id); return -1; } id = ipsec_build_id(remote_id, &sz); if (!id) return -1; LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH_SA_NONCE: IDrc", id, sz)); if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { free(id); return -1; } } /* XXX I do not judge these as errors, are they? */ else if (local_id) log_print("initiator_send_HASH_SA_NONCE: " "Local-ID given without Remote-ID for \"%s\"", exchange->name); else if (remote_id) /* * This code supports the "road warrior" case, where the * initiator doesn't have a fixed IP address, but wants to * specify a particular remote network to talk to. -- Adrian * Close */ { log_print("initiator_send_HASH_SA_NONCE: " "Remote-ID given without Local-ID for \"%s\"", exchange->name); /* * If we're here, then we are the initiator, so use initiator * address for local ID */ msg->transport->vtbl->get_src(msg->transport, &src); sz = ISAKMP_ID_SZ + sockaddr_addrlen(src); id = calloc(sz, sizeof(char)); if (!id) { log_error("initiator_send_HASH_SA_NONCE: " "calloc (%lu, %lu) failed", (unsigned long)sz, (unsigned long)sizeof(char)); return -1; } switch (src->sa_family) { case AF_INET6: SET_ISAKMP_ID_TYPE(id, IPSEC_ID_IPV6_ADDR); break; case AF_INET: SET_ISAKMP_ID_TYPE(id, IPSEC_ID_IPV4_ADDR); break; default: log_error("initiator_send_HASH_SA_NONCE: " "unknown sa_family %d", src->sa_family); free(id); return -1; } memcpy(id + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), sockaddr_addrlen(src)); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH_SA_NONCE: IDic", id, sz)); if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { free(id); return -1; } /* Send supplied remote_id */ id = ipsec_build_id(remote_id, &sz); if (!id) return -1; LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH_SA_NONCE: IDrc", id, sz)); if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { free(id); return -1; } } if (ipsec_fill_in_hash(msg)) goto bail_out; conf_free_list(suite_conf); for (i = 0; i < prop_no; i++) { free(transform[i]); free(transform_len[i]); } free(proposal); free(transform); free(transforms_len); free(transform_len); free(transform_cnt); return 0; bail_out: free(sa_buf); if (proposal) { for (i = 0; i < prop_no; i++) { free(proposal[i]); if (transform[i]) { for (xf_no = 0; xf_no < transform_cnt[i]; xf_no++) free(transform[i][xf_no]); free(transform[i]); } free(transform_len[i]); } free(proposal); free(transforms_len); free(transform); free(transform_len); free(transform_cnt); } if (xf_conf) conf_free_list(xf_conf); if (prot_conf) conf_free_list(prot_conf); conf_free_list(suite_conf); return -1; } /* Figure out what transform the responder chose. */ static int initiator_recv_HASH_SA_NONCE(struct message *msg) { struct exchange *exchange = msg->exchange; struct ipsec_exch *ie = exchange->data; struct sa *sa; struct proto *proto, *next_proto; struct payload *sa_p = payload_first(msg, ISAKMP_PAYLOAD_SA); struct payload *xf, *idp; struct payload *hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); struct payload *kep = payload_first(msg, ISAKMP_PAYLOAD_KEY_EXCH); struct prf *prf; struct sa *isakmp_sa = msg->isakmp_sa; struct ipsec_sa *isa = isakmp_sa->data; struct hash *hash = hash_get(isa->hash); u_int8_t *rest; size_t rest_len; struct sockaddr *src, *dst; /* Allocate the prf and start calculating our HASH(1). XXX Share? */ LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: " "SKEYID_a", (u_int8_t *)isa->skeyid_a, isa->skeyid_len)); prf = prf_alloc(isa->prf_type, hash->type, isa->skeyid_a, isa->skeyid_len); if (!prf) return -1; prf->Init(prf->prfctx); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: message_id", exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); prf->Update(prf->prfctx, exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: " "NONCE_I_b", exchange->nonce_i, exchange->nonce_i_len)); prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); rest = hashp->p + GET_ISAKMP_GEN_LENGTH(hashp->p); rest_len = (GET_ISAKMP_HDR_LENGTH(msg->iov[0].iov_base) - (rest - (u_int8_t *)msg->iov[0].iov_base)); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: payloads after HASH(2)", rest, rest_len)); prf->Update(prf->prfctx, rest, rest_len); prf->Final(hash->digest, prf->prfctx); prf_free(prf); LOG_DBG_BUF((LOG_NEGOTIATION, 80, "initiator_recv_HASH_SA_NONCE: computed HASH(2)", hash->digest, hash->hashsize)); if (memcmp(hashp->p + ISAKMP_HASH_DATA_OFF, hash->digest, hash->hashsize) != 0) { message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1, 0); return -1; } /* Mark the HASH as handled. */ hashp->flags |= PL_MARK; /* Mark message as authenticated. */ msg->flags |= MSG_AUTHENTICATED; /* * As we are getting an answer on our transform offer, only one * transform should be given. * * XXX Currently we only support negotiating one SA per quick mode run. */ if (TAILQ_NEXT(sa_p, link)) { log_print("initiator_recv_HASH_SA_NONCE: " "multiple SA payloads in quick mode not supported yet"); return -1; } sa = TAILQ_FIRST(&exchange->sa_list); /* This is here for the policy check */ if (kep) ie->pfs = 1; /* Drop message when it contains ID types we do not implement yet. */ TAILQ_FOREACH(idp, &msg->payload[ISAKMP_PAYLOAD_ID], link) { switch (GET_ISAKMP_ID_TYPE(idp->p)) { case IPSEC_ID_IPV4_ADDR: case IPSEC_ID_IPV4_ADDR_SUBNET: case IPSEC_ID_IPV6_ADDR: case IPSEC_ID_IPV6_ADDR_SUBNET: break; case IPSEC_ID_FQDN: /* * FQDN may be used for in NAT-T with transport mode. * We can handle the message in this case. In the * other cases we'll drop the message later. */ break; default: message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 0, 1, 0); return -1; } } /* Handle optional client ID payloads. */ idp = payload_first(msg, ISAKMP_PAYLOAD_ID); if (idp) { /* If IDci is there, IDcr must be too. */ if (!TAILQ_NEXT(idp, link)) { /* XXX Is this a good notify type? */ message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1, 0); return -1; } /* XXX We should really compare, not override. */ ie->id_ci_sz = GET_ISAKMP_GEN_LENGTH(idp->p); ie->id_ci = malloc(ie->id_ci_sz); if (!ie->id_ci) { log_error("initiator_recv_HASH_SA_NONCE: " "malloc (%lu) failed", (unsigned long)ie->id_ci_sz); return -1; } memcpy(ie->id_ci, idp->p, ie->id_ci_sz); idp->flags |= PL_MARK; LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: IDci", ie->id_ci + ISAKMP_GEN_SZ, ie->id_ci_sz - ISAKMP_GEN_SZ)); idp = TAILQ_NEXT(idp, link); ie->id_cr_sz = GET_ISAKMP_GEN_LENGTH(idp->p); ie->id_cr = malloc(ie->id_cr_sz); if (!ie->id_cr) { log_error("initiator_recv_HASH_SA_NONCE: " "malloc (%lu) failed", (unsigned long)ie->id_cr_sz); return -1; } memcpy(ie->id_cr, idp->p, ie->id_cr_sz); idp->flags |= PL_MARK; LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_recv_HASH_SA_NONCE: IDcr", ie->id_cr + ISAKMP_GEN_SZ, ie->id_cr_sz - ISAKMP_GEN_SZ)); } else { /* * If client identifiers are not present in the exchange, * we fake them. RFC 2409 states: * The identities of the SAs negotiated in Quick Mode are * implicitly assumed to be the IP addresses of the ISAKMP * peers, without any constraints on the protocol or port * numbers allowed, unless client identifiers are specified * in Quick Mode. * * -- Michael Paddon (mwp@aba.net.au) */ ie->flags = IPSEC_EXCH_FLAG_NO_ID; /* Get initiator and responder addresses. */ msg->transport->vtbl->get_src(msg->transport, &src); msg->transport->vtbl->get_dst(msg->transport, &dst); ie->id_ci_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(src); ie->id_cr_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(dst); ie->id_ci = calloc(ie->id_ci_sz, sizeof(char)); ie->id_cr = calloc(ie->id_cr_sz, sizeof(char)); if (!ie->id_ci || !ie->id_cr) { log_error("initiator_recv_HASH_SA_NONCE: " "calloc (%lu, %lu) failed", (unsigned long)ie->id_cr_sz, (unsigned long)sizeof(char)); free(ie->id_ci); ie->id_ci = 0; free(ie->id_cr); ie->id_cr = 0; return -1; } if (src->sa_family != dst->sa_family) { log_error("initiator_recv_HASH_SA_NONCE: " "sa_family mismatch"); free(ie->id_ci); ie->id_ci = 0; free(ie->id_cr); ie->id_cr = 0; return -1; } switch (src->sa_family) { case AF_INET: SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV4_ADDR); SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV4_ADDR); break; case AF_INET6: SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV6_ADDR); SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV6_ADDR); break; default: log_error("initiator_recv_HASH_SA_NONCE: " "unknown sa_family %d", src->sa_family); free(ie->id_ci); ie->id_ci = 0; free(ie->id_cr); ie->id_cr = 0; return -1; } memcpy(ie->id_ci + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), sockaddr_addrlen(src)); memcpy(ie->id_cr + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(dst), sockaddr_addrlen(dst)); } /* Build the protection suite in our SA. */ TAILQ_FOREACH(xf, &msg->payload[ISAKMP_PAYLOAD_TRANSFORM], link) { /* * XXX We could check that the proposal each transform * belongs to is unique. */ if (sa_add_transform(sa, xf, exchange->initiator, &proto)) return -1; /* XXX Check that the chosen transform matches an offer. */ ipsec_decode_transform(msg, sa, proto, xf->p); } /* Now remove offers that we don't need anymore. */ for (proto = TAILQ_FIRST(&sa->protos); proto; proto = next_proto) { next_proto = TAILQ_NEXT(proto, link); if (!proto->chosen) proto_free(proto); } if (!check_policy(exchange, sa, msg->isakmp_sa)) { message_drop(msg, ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); log_print("initiator_recv_HASH_SA_NONCE: policy check failed"); return -1; } /* Mark the SA as handled. */ sa_p->flags |= PL_MARK; isa = sa->data; if ((isa->group_desc && (!ie->group || ie->group->id != isa->group_desc)) || (!isa->group_desc && ie->group)) { log_print("initiator_recv_HASH_SA_NONCE: disagreement on PFS"); return -1; } /* Copy out the initiator's nonce. */ if (exchange_save_nonce(msg)) return -1; /* Handle the optional KEY_EXCH payload. */ if (kep && ipsec_save_g_x(msg)) return -1; return 0; } static int initiator_send_HASH(struct message *msg) { struct exchange *exchange = msg->exchange; struct ipsec_exch *ie = exchange->data; struct sa *isakmp_sa = msg->isakmp_sa; struct ipsec_sa *isa = isakmp_sa->data; struct prf *prf; u_int8_t *buf; struct hash *hash = hash_get(isa->hash); /* * We want a HASH payload to start with. XXX Share with * ike_main_mode.c? */ buf = malloc(ISAKMP_HASH_SZ + hash->hashsize); if (!buf) { log_error("initiator_send_HASH: malloc (%lu) failed", ISAKMP_HASH_SZ + (unsigned long)hash->hashsize); return -1; } if (message_add_payload(msg, ISAKMP_PAYLOAD_HASH, buf, ISAKMP_HASH_SZ + hash->hashsize, 1)) { free(buf); return -1; } /* Allocate the prf and start calculating our HASH(3). XXX Share? */ LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: SKEYID_a", isa->skeyid_a, isa->skeyid_len)); prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, isa->skeyid_len); if (!prf) return -1; prf->Init(prf->prfctx); prf->Update(prf->prfctx, (unsigned char *)"\0", 1); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: message_id", exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); prf->Update(prf->prfctx, exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: NONCE_I_b", exchange->nonce_i, exchange->nonce_i_len)); prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: NONCE_R_b", exchange->nonce_r, exchange->nonce_r_len)); prf->Update(prf->prfctx, exchange->nonce_r, exchange->nonce_r_len); prf->Final(buf + ISAKMP_GEN_SZ, prf->prfctx); prf_free(prf); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "initiator_send_HASH: HASH(3)", buf + ISAKMP_GEN_SZ, hash->hashsize)); if (ie->group) message_register_post_send(msg, gen_g_xy); message_register_post_send(msg, post_quick_mode); return 0; } static void post_quick_mode(struct message *msg) { struct sa *isakmp_sa = msg->isakmp_sa; struct ipsec_sa *isa = isakmp_sa->data; struct exchange *exchange = msg->exchange; struct ipsec_exch *ie = exchange->data; struct prf *prf; struct sa *sa; struct proto *proto; struct ipsec_proto *iproto; u_int8_t *keymat; int i; /* * Loop over all SA negotiations and do both an in- and an outgoing SA * per protocol. */ for (sa = TAILQ_FIRST(&exchange->sa_list); sa; sa = TAILQ_NEXT(sa, next)) { for (proto = TAILQ_FIRST(&sa->protos); proto; proto = TAILQ_NEXT(proto, link)) { if (proto->proto == IPSEC_PROTO_IPCOMP) continue; iproto = proto->data; /* * There are two SAs for each SA negotiation, * incoming and outgoing. */ for (i = 0; i < 2; i++) { prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_d, isa->skeyid_len); if (!prf) { /* XXX What to do? */ continue; } ie->keymat_len = ipsec_keymat_length(proto); /* * We need to roundup the length of the key * material buffer to a multiple of the PRF's * blocksize as it is generated in chunks of * that blocksize. */ iproto->keymat[i] = malloc(((ie->keymat_len + prf->blocksize - 1) / prf->blocksize) * prf->blocksize); if (!iproto->keymat[i]) { log_error("post_quick_mode: " "malloc (%lu) failed", (((unsigned long)ie->keymat_len + prf->blocksize - 1) / prf->blocksize) * prf->blocksize); /* XXX What more to do? */ free(prf); continue; } for (keymat = iproto->keymat[i]; keymat < iproto->keymat[i] + ie->keymat_len; keymat += prf->blocksize) { prf->Init(prf->prfctx); if (keymat != iproto->keymat[i]) { /* * Hash in last round's * KEYMAT. */ LOG_DBG_BUF((LOG_NEGOTIATION, 90, "post_quick_mode: " "last KEYMAT", keymat - prf->blocksize, prf->blocksize)); prf->Update(prf->prfctx, keymat - prf->blocksize, prf->blocksize); } /* If PFS is used hash in g^xy. */ if (ie->g_xy) { LOG_DBG_BUF((LOG_NEGOTIATION, 90, "post_quick_mode: " "g^xy", ie->g_xy, ie->g_x_len)); prf->Update(prf->prfctx, ie->g_xy, ie->g_x_len); } LOG_DBG((LOG_NEGOTIATION, 90, "post_quick_mode: " "suite %d proto %d", proto->no, proto->proto)); prf->Update(prf->prfctx, &proto->proto, 1); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "post_quick_mode: SPI", proto->spi[i], proto->spi_sz[i])); prf->Update(prf->prfctx, proto->spi[i], proto->spi_sz[i]); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "post_quick_mode: Ni_b", exchange->nonce_i, exchange->nonce_i_len)); prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "post_quick_mode: Nr_b", exchange->nonce_r, exchange->nonce_r_len)); prf->Update(prf->prfctx, exchange->nonce_r, exchange->nonce_r_len); prf->Final(keymat, prf->prfctx); } prf_free(prf); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "post_quick_mode: KEYMAT", iproto->keymat[i], ie->keymat_len)); } } } log_verbose("isakmpd: quick mode done%s: %s", (exchange->initiator == 0) ? " (as responder)" : "", !msg->isakmp_sa || !msg->isakmp_sa->transport ? "" : msg->isakmp_sa->transport->vtbl->decode_ids (msg->isakmp_sa->transport)); } /* * Accept a set of transforms offered by the initiator and chose one we can * handle. * XXX Describe in more detail. */ static int responder_recv_HASH_SA_NONCE(struct message *msg) { struct payload *hashp, *kep, *idp; struct sa *sa; struct sa *isakmp_sa = msg->isakmp_sa; struct ipsec_sa *isa = isakmp_sa->data; struct exchange *exchange = msg->exchange; struct ipsec_exch *ie = exchange->data; struct prf *prf; u_int8_t *hash, *my_hash = 0; size_t hash_len; u_int8_t *pkt = msg->iov[0].iov_base; u_int8_t group_desc = 0; int retval = -1; struct proto *proto; struct sockaddr *src, *dst; char *name; hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); hash = hashp->p; hashp->flags |= PL_MARK; /* The HASH payload should be the first one. */ if (hash != pkt + ISAKMP_HDR_SZ) { /* XXX Is there a better notification type? */ message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1, 0); goto cleanup; } hash_len = GET_ISAKMP_GEN_LENGTH(hash); my_hash = malloc(hash_len - ISAKMP_GEN_SZ); if (!my_hash) { log_error("responder_recv_HASH_SA_NONCE: malloc (%lu) failed", (unsigned long)hash_len - ISAKMP_GEN_SZ); goto cleanup; } /* * Check the payload's integrity. * XXX Share with ipsec_fill_in_hash? */ LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH_SA_NONCE: " "SKEYID_a", isa->skeyid_a, isa->skeyid_len)); prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, isa->skeyid_len); if (!prf) goto cleanup; prf->Init(prf->prfctx); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH_SA_NONCE: message_id", exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); prf->Update(prf->prfctx, exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH_SA_NONCE: message after HASH", hash + hash_len, msg->iov[0].iov_len - ISAKMP_HDR_SZ - hash_len)); prf->Update(prf->prfctx, hash + hash_len, msg->iov[0].iov_len - ISAKMP_HDR_SZ - hash_len); prf->Final(my_hash, prf->prfctx); prf_free(prf); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH_SA_NONCE: computed HASH(1)", my_hash, hash_len - ISAKMP_GEN_SZ)); if (memcmp(hash + ISAKMP_GEN_SZ, my_hash, hash_len - ISAKMP_GEN_SZ) != 0) { message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1, 0); goto cleanup; } free(my_hash); my_hash = 0; /* Mark message as authenticated. */ msg->flags |= MSG_AUTHENTICATED; kep = payload_first(msg, ISAKMP_PAYLOAD_KEY_EXCH); if (kep) ie->pfs = 1; /* Drop message when it contains ID types we do not implement yet. */ TAILQ_FOREACH(idp, &msg->payload[ISAKMP_PAYLOAD_ID], link) { switch (GET_ISAKMP_ID_TYPE(idp->p)) { case IPSEC_ID_IPV4_ADDR: case IPSEC_ID_IPV4_ADDR_SUBNET: case IPSEC_ID_IPV6_ADDR: case IPSEC_ID_IPV6_ADDR_SUBNET: break; case IPSEC_ID_FQDN: /* * FQDN may be used for in NAT-T with transport mode. * We can handle the message in this case. In the * other cases we'll drop the message later. */ break; default: message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 0, 1, 0); goto cleanup; } } /* Handle optional client ID payloads. */ idp = payload_first(msg, ISAKMP_PAYLOAD_ID); if (idp) { /* If IDci is there, IDcr must be too. */ if (!TAILQ_NEXT(idp, link)) { /* XXX Is this a good notify type? */ message_drop(msg, ISAKMP_NOTIFY_PAYLOAD_MALFORMED, 0, 1, 0); goto cleanup; } ie->id_ci_sz = GET_ISAKMP_GEN_LENGTH(idp->p); ie->id_ci = malloc(ie->id_ci_sz); if (!ie->id_ci) { log_error("responder_recv_HASH_SA_NONCE: " "malloc (%lu) failed", (unsigned long)ie->id_ci_sz); goto cleanup; } memcpy(ie->id_ci, idp->p, ie->id_ci_sz); idp->flags |= PL_MARK; LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH_SA_NONCE: IDci", ie->id_ci + ISAKMP_GEN_SZ, ie->id_ci_sz - ISAKMP_GEN_SZ)); idp = TAILQ_NEXT(idp, link); ie->id_cr_sz = GET_ISAKMP_GEN_LENGTH(idp->p); ie->id_cr = malloc(ie->id_cr_sz); if (!ie->id_cr) { log_error("responder_recv_HASH_SA_NONCE: " "malloc (%lu) failed", (unsigned long)ie->id_cr_sz); goto cleanup; } memcpy(ie->id_cr, idp->p, ie->id_cr_sz); idp->flags |= PL_MARK; LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH_SA_NONCE: IDcr", ie->id_cr + ISAKMP_GEN_SZ, ie->id_cr_sz - ISAKMP_GEN_SZ)); } else { /* * If client identifiers are not present in the exchange, * we fake them. RFC 2409 states: * The identities of the SAs negotiated in Quick Mode are * implicitly assumed to be the IP addresses of the ISAKMP * peers, without any constraints on the protocol or port * numbers allowed, unless client identifiers are specified * in Quick Mode. * * -- Michael Paddon (mwp@aba.net.au) */ ie->flags = IPSEC_EXCH_FLAG_NO_ID; /* Get initiator and responder addresses. */ msg->transport->vtbl->get_src(msg->transport, &src); msg->transport->vtbl->get_dst(msg->transport, &dst); ie->id_ci_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(src); ie->id_cr_sz = ISAKMP_ID_DATA_OFF + sockaddr_addrlen(dst); ie->id_ci = calloc(ie->id_ci_sz, sizeof(char)); ie->id_cr = calloc(ie->id_cr_sz, sizeof(char)); if (!ie->id_ci || !ie->id_cr) { log_error("responder_recv_HASH_SA_NONCE: " "calloc (%lu, %lu) failed", (unsigned long)ie->id_ci_sz, (unsigned long)sizeof(char)); goto cleanup; } if (src->sa_family != dst->sa_family) { log_error("initiator_recv_HASH_SA_NONCE: " "sa_family mismatch"); goto cleanup; } switch (src->sa_family) { case AF_INET: SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV4_ADDR); SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV4_ADDR); break; case AF_INET6: SET_ISAKMP_ID_TYPE(ie->id_ci, IPSEC_ID_IPV6_ADDR); SET_ISAKMP_ID_TYPE(ie->id_cr, IPSEC_ID_IPV6_ADDR); break; default: log_error("initiator_recv_HASH_SA_NONCE: " "unknown sa_family %d", src->sa_family); goto cleanup; } memcpy(ie->id_cr + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(src), sockaddr_addrlen(src)); memcpy(ie->id_ci + ISAKMP_ID_DATA_OFF, sockaddr_addrdata(dst), sockaddr_addrlen(dst)); } if (message_negotiate_sa(msg, check_policy)) goto cleanup; for (sa = TAILQ_FIRST(&exchange->sa_list); sa; sa = TAILQ_NEXT(sa, next)) { for (proto = TAILQ_FIRST(&sa->protos); proto; proto = TAILQ_NEXT(proto, link)) { /* * XXX we need to have some attributes per proto, not * all per SA. */ ipsec_decode_transform(msg, sa, proto, proto->chosen->p); if (proto->proto == IPSEC_PROTO_IPSEC_AH && !((struct ipsec_proto *)proto->data)->auth) { log_print("responder_recv_HASH_SA_NONCE: " "AH proposed without an algorithm " "attribute"); message_drop(msg, ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); goto next_sa; } } isa = sa->data; /* * The group description is mandatory if we got a KEY_EXCH * payload. */ if (kep) { if (!isa->group_desc) { log_print("responder_recv_HASH_SA_NONCE: " "KEY_EXCH payload without a group " "desc. attribute"); message_drop(msg, ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); continue; } /* Also, all SAs must have equal groups. */ if (!group_desc) group_desc = isa->group_desc; else if (group_desc != isa->group_desc) { log_print("responder_recv_HASH_SA_NONCE: " "differing group descriptions in one QM"); message_drop(msg, ISAKMP_NOTIFY_NO_PROPOSAL_CHOSEN, 0, 1, 0); continue; } } /* At least one SA was accepted. */ retval = 0; next_sa: ; /* XXX gcc3 wants this. */ } if (kep) { ie->group = group_get(group_desc); if (!ie->group) { /* * XXX If the error was due to an out-of-range group * description we should notify our peer, but this * should probably be done by the attribute * validation. Is it? */ goto cleanup; } } /* Copy out the initiator's nonce. */ if (exchange_save_nonce(msg)) goto cleanup; /* Handle the optional KEY_EXCH payload. */ if (kep && ipsec_save_g_x(msg)) goto cleanup; /* * Try to find and set the connection name on the exchange. */ /* * Check for accepted identities as well as lookup the connection * name and set it on the exchange. * * When not using policies make sure the peer proposes sane IDs. * Otherwise this is done by KeyNote. */ name = connection_passive_lookup_by_ids(ie->id_ci, ie->id_cr); if (name) { exchange->name = strdup(name); if (!exchange->name) { log_error("responder_recv_HASH_SA_NONCE: " "strdup (\"%s\") failed", name); goto cleanup; } } else if ( ignore_policy || strncmp("yes", conf_get_str("General", "Use-Keynote"), 3)) { log_print("responder_recv_HASH_SA_NONCE: peer proposed " "invalid phase 2 IDs: %s", (exchange->doi->decode_ids("initiator id %s, responder" " id %s", ie->id_ci, ie->id_ci_sz, ie->id_cr, ie->id_cr_sz, 1))); message_drop(msg, ISAKMP_NOTIFY_INVALID_ID_INFORMATION, 0, 1, 0); goto cleanup; } return retval; cleanup: /* Remove all potential protocols that have been added to the SAs. */ for (sa = TAILQ_FIRST(&exchange->sa_list); sa; sa = TAILQ_NEXT(sa, next)) while ((proto = TAILQ_FIRST(&sa->protos)) != 0) proto_free(proto); free(my_hash); free(ie->id_ci); ie->id_ci = 0; free(ie->id_cr); ie->id_cr = 0; return -1; } /* Reply with the transform we chose. */ static int responder_send_HASH_SA_NONCE(struct message *msg) { struct exchange *exchange = msg->exchange; struct ipsec_exch *ie = exchange->data; struct sa *isakmp_sa = msg->isakmp_sa; struct ipsec_sa *isa = isakmp_sa->data; struct prf *prf; struct hash *hash = hash_get(isa->hash); size_t nonce_sz = exchange->nonce_i_len; u_int8_t *buf; int initiator = exchange->initiator; char header[80]; u_int32_t i; u_int8_t *id; size_t sz; /* * We want a HASH payload to start with. XXX Share with * ike_main_mode.c? */ buf = malloc(ISAKMP_HASH_SZ + hash->hashsize); if (!buf) { log_error("responder_send_HASH_SA_NONCE: malloc (%lu) failed", ISAKMP_HASH_SZ + (unsigned long)hash->hashsize); return -1; } if (message_add_payload(msg, ISAKMP_PAYLOAD_HASH, buf, ISAKMP_HASH_SZ + hash->hashsize, 1)) { free(buf); return -1; } /* Add the SA payload(s) with the transform(s) that was/were chosen. */ if (message_add_sa_payload(msg)) return -1; /* Generate a nonce, and add it to the message. */ if (exchange_gen_nonce(msg, nonce_sz)) return -1; /* Generate optional KEY_EXCH payload. This is known as PFS. */ if (ie->group && ipsec_gen_g_x(msg)) return -1; /* * If the initiator client ID's were acceptable, just mirror them * back. */ if (!(ie->flags & IPSEC_EXCH_FLAG_NO_ID)) { sz = ie->id_ci_sz; id = malloc(sz); if (!id) { log_error("responder_send_HASH_SA_NONCE: " "malloc (%lu) failed", (unsigned long)sz); return -1; } memcpy(id, ie->id_ci, sz); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: IDic", id, sz)); if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { free(id); return -1; } sz = ie->id_cr_sz; id = malloc(sz); if (!id) { log_error("responder_send_HASH_SA_NONCE: " "malloc (%lu) failed", (unsigned long)sz); return -1; } memcpy(id, ie->id_cr, sz); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: IDrc", id, sz)); if (message_add_payload(msg, ISAKMP_PAYLOAD_ID, id, sz, 1)) { free(id); return -1; } } /* Allocate the prf and start calculating our HASH(2). XXX Share? */ LOG_DBG((LOG_NEGOTIATION, 90, "responder_recv_HASH: " "isakmp_sa %p isa %p", isakmp_sa, isa)); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: " "SKEYID_a", isa->skeyid_a, isa->skeyid_len)); prf = prf_alloc(isa->prf_type, hash->type, isa->skeyid_a, isa->skeyid_len); if (!prf) return -1; prf->Init(prf->prfctx); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: message_id", exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); prf->Update(prf->prfctx, exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_send_HASH_SA_NONCE: " "NONCE_I_b", exchange->nonce_i, exchange->nonce_i_len)); prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); /* Loop over all payloads after HASH(2). */ for (i = 2; i < msg->iovlen; i++) { /* XXX Misleading payload type printouts. */ snprintf(header, sizeof header, "responder_send_HASH_SA_NONCE: payload %d after HASH(2)", i - 1); LOG_DBG_BUF((LOG_NEGOTIATION, 90, header, msg->iov[i].iov_base, msg->iov[i].iov_len)); prf->Update(prf->prfctx, msg->iov[i].iov_base, msg->iov[i].iov_len); } prf->Final(buf + ISAKMP_HASH_DATA_OFF, prf->prfctx); prf_free(prf); snprintf(header, sizeof header, "responder_send_HASH_SA_NONCE: " "HASH_%c", initiator ? 'I' : 'R'); LOG_DBG_BUF((LOG_NEGOTIATION, 80, header, buf + ISAKMP_HASH_DATA_OFF, hash->hashsize)); if (ie->group) message_register_post_send(msg, gen_g_xy); return 0; } static void gen_g_xy(struct message *msg) { struct exchange *exchange = msg->exchange; struct ipsec_exch *ie = exchange->data; /* Compute Diffie-Hellman shared value. */ ie->g_xy = malloc(ie->g_x_len); if (!ie->g_xy) { log_error("gen_g_xy: malloc (%lu) failed", (unsigned long)ie->g_x_len); return; } if (dh_create_shared(ie->group, ie->g_xy, exchange->initiator ? ie->g_xr : ie->g_xi)) { log_print("gen_g_xy: dh_create_shared failed"); return; } LOG_DBG_BUF((LOG_NEGOTIATION, 80, "gen_g_xy: g^xy", ie->g_xy, ie->g_x_len)); } static int responder_recv_HASH(struct message *msg) { struct exchange *exchange = msg->exchange; struct sa *isakmp_sa = msg->isakmp_sa; struct ipsec_sa *isa = isakmp_sa->data; struct prf *prf; u_int8_t *hash, *my_hash = 0; size_t hash_len; struct payload *hashp; /* Find HASH(3) and create our own hash, just as big. */ hashp = payload_first(msg, ISAKMP_PAYLOAD_HASH); hash = hashp->p; hashp->flags |= PL_MARK; hash_len = GET_ISAKMP_GEN_LENGTH(hash); my_hash = malloc(hash_len - ISAKMP_GEN_SZ); if (!my_hash) { log_error("responder_recv_HASH: malloc (%lu) failed", (unsigned long)hash_len - ISAKMP_GEN_SZ); goto cleanup; } /* Allocate the prf and start calculating our HASH(3). XXX Share? */ LOG_DBG((LOG_NEGOTIATION, 90, "responder_recv_HASH: " "isakmp_sa %p isa %p", isakmp_sa, isa)); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: SKEYID_a", isa->skeyid_a, isa->skeyid_len)); prf = prf_alloc(isa->prf_type, isa->hash, isa->skeyid_a, isa->skeyid_len); if (!prf) goto cleanup; prf->Init(prf->prfctx); prf->Update(prf->prfctx, (unsigned char *)"\0", 1); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: message_id", exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN)); prf->Update(prf->prfctx, exchange->message_id, ISAKMP_HDR_MESSAGE_ID_LEN); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: NONCE_I_b", exchange->nonce_i, exchange->nonce_i_len)); prf->Update(prf->prfctx, exchange->nonce_i, exchange->nonce_i_len); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: NONCE_R_b", exchange->nonce_r, exchange->nonce_r_len)); prf->Update(prf->prfctx, exchange->nonce_r, exchange->nonce_r_len); prf->Final(my_hash, prf->prfctx); prf_free(prf); LOG_DBG_BUF((LOG_NEGOTIATION, 90, "responder_recv_HASH: computed HASH(3)", my_hash, hash_len - ISAKMP_GEN_SZ)); if (memcmp(hash + ISAKMP_GEN_SZ, my_hash, hash_len - ISAKMP_GEN_SZ) != 0) { message_drop(msg, ISAKMP_NOTIFY_INVALID_HASH_INFORMATION, 0, 1, 0); goto cleanup; } free(my_hash); /* Mark message as authenticated. */ msg->flags |= MSG_AUTHENTICATED; post_quick_mode(msg); return 0; cleanup: free(my_hash); return -1; }