diff options
Diffstat (limited to 'crypto/heimdal/kdc/kerberos4.c')
| -rw-r--r-- | crypto/heimdal/kdc/kerberos4.c | 655 |
1 files changed, 0 insertions, 655 deletions
diff --git a/crypto/heimdal/kdc/kerberos4.c b/crypto/heimdal/kdc/kerberos4.c deleted file mode 100644 index 111bd9f8a45d..000000000000 --- a/crypto/heimdal/kdc/kerberos4.c +++ /dev/null @@ -1,655 +0,0 @@ -/* - * Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan - * (Royal Institute of Technology, Stockholm, Sweden). - * 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. - * - * 3. Neither the name of the Institute nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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 "kdc_locl.h" - -RCSID("$Id: kerberos4.c,v 1.36 2001/01/30 01:44:08 assar Exp $"); - -#ifdef KRB4 - -#ifndef swap32 -static u_int32_t -swap32(u_int32_t x) -{ - return ((x << 24) & 0xff000000) | - ((x << 8) & 0xff0000) | - ((x >> 8) & 0xff00) | - ((x >> 24) & 0xff); -} -#endif /* swap32 */ - -int -maybe_version4(unsigned char *buf, int len) -{ - return len > 0 && *buf == 4; -} - -static void -make_err_reply(krb5_data *reply, int code, const char *msg) -{ - KTEXT_ST er; - - /* name, instance and realm are not checked in most (all?) - implementations; msg is also never used, but we send it anyway - (for debugging purposes) */ - - if(msg == NULL) - msg = krb_get_err_text(code); - cr_err_reply(&er, "", "", "", kdc_time, code, (char*)msg); - krb5_data_copy(reply, er.dat, er.length); -} - -static krb5_boolean -valid_princ(krb5_context context, krb5_principal princ) -{ - krb5_error_code ret; - char *s; - hdb_entry *ent; - - ret = krb5_unparse_name(context, princ, &s); - if (ret) - return 0; - ret = db_fetch(princ, &ent); - if (ret) { - kdc_log(7, "Lookup %s failed: %s", s, - krb5_get_err_text (context, ret)); - free(s); - return 0; - } - kdc_log(7, "Lookup %s succeeded", s); - free(s); - free_ent(ent); - return 1; -} - -krb5_error_code -db_fetch4(const char *name, const char *instance, const char *realm, - hdb_entry **ent) -{ - krb5_principal p; - krb5_error_code ret; - - ret = krb5_425_conv_principal_ext(context, name, instance, realm, - valid_princ, 0, &p); - if(ret) - return ret; - ret = db_fetch(p, ent); - krb5_free_principal(context, p); - return ret; -} - -krb5_error_code -get_des_key(hdb_entry *principal, krb5_boolean prefer_afs_key, Key **ret_key) -{ - Key *v5_key = NULL, *v4_key = NULL, *afs_key = NULL; - int i; - krb5_enctype etypes[] = { ETYPE_DES_CBC_MD5, - ETYPE_DES_CBC_MD4, - ETYPE_DES_CBC_CRC }; - - for(i = 0; - i < sizeof(etypes)/sizeof(etypes[0]) - && (v5_key == NULL || v4_key == NULL || afs_key == NULL); - ++i) { - Key *key = NULL; - while(hdb_next_enctype2key(context, principal, etypes[i], &key) == 0) { - if(key->salt == NULL) { - if(v5_key == NULL) - v5_key = key; - } else if(key->salt->type == hdb_pw_salt && - key->salt->salt.length == 0) { - if(v4_key == NULL) - v4_key = key; - } else if(key->salt->type == hdb_afs3_salt) { - if(afs_key == NULL) - afs_key = key; - } - } - } - - if(prefer_afs_key) { - if(afs_key) - *ret_key = afs_key; - else if(v4_key) - *ret_key = v4_key; - else if(v5_key) - *ret_key = v5_key; - else - return KERB_ERR_NULL_KEY; - } else { - if(v4_key) - *ret_key = v4_key; - else if(afs_key) - *ret_key = afs_key; - else if(v5_key) - *ret_key = v5_key; - else - return KERB_ERR_NULL_KEY; - } - - if((*ret_key)->key.keyvalue.length == 0) - return KERB_ERR_NULL_KEY; - return 0; -} - -#define RCHECK(X, L) if(X){make_err_reply(reply, KFAILURE, "Packet too short"); goto L;} - -/* - * Process the v4 request in `buf, len' (received from `addr' - * (with string `from'). - * Return an error code and a reply in `reply'. - */ - -krb5_error_code -do_version4(unsigned char *buf, - size_t len, - krb5_data *reply, - const char *from, - struct sockaddr_in *addr) -{ - krb5_storage *sp; - krb5_error_code ret; - hdb_entry *client = NULL, *server = NULL; - Key *ckey, *skey; - int8_t pvno; - int8_t msg_type; - int lsb; - char *name = NULL, *inst = NULL, *realm = NULL; - char *sname = NULL, *sinst = NULL; - int32_t req_time; - time_t max_life; - u_int8_t life; - char client_name[256]; - char server_name[256]; - - if(!enable_v4) { - kdc_log(0, "Rejected version 4 request from %s", from); - make_err_reply(reply, KDC_GEN_ERR, "function not enabled"); - return 0; - } - - sp = krb5_storage_from_mem(buf, len); - RCHECK(krb5_ret_int8(sp, &pvno), out); - if(pvno != 4){ - kdc_log(0, "Protocol version mismatch (%d)", pvno); - make_err_reply(reply, KDC_PKT_VER, NULL); - goto out; - } - RCHECK(krb5_ret_int8(sp, &msg_type), out); - lsb = msg_type & 1; - msg_type &= ~1; - switch(msg_type){ - case AUTH_MSG_KDC_REQUEST: - RCHECK(krb5_ret_stringz(sp, &name), out1); - RCHECK(krb5_ret_stringz(sp, &inst), out1); - RCHECK(krb5_ret_stringz(sp, &realm), out1); - RCHECK(krb5_ret_int32(sp, &req_time), out1); - if(lsb) - req_time = swap32(req_time); - RCHECK(krb5_ret_int8(sp, &life), out1); - RCHECK(krb5_ret_stringz(sp, &sname), out1); - RCHECK(krb5_ret_stringz(sp, &sinst), out1); - snprintf (client_name, sizeof(client_name), - "%s.%s@%s", name, inst, realm); - snprintf (server_name, sizeof(server_name), - "%s.%s@%s", sname, sinst, v4_realm); - - kdc_log(0, "AS-REQ %s from %s for %s", - client_name, from, server_name); - - ret = db_fetch4(name, inst, realm, &client); - if(ret) { - kdc_log(0, "Client not found in database: %s: %s", - client_name, krb5_get_err_text(context, ret)); - make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, NULL); - goto out1; - } - ret = db_fetch4(sname, sinst, v4_realm, &server); - if(ret){ - kdc_log(0, "Server not found in database: %s: %s", - server_name, krb5_get_err_text(context, ret)); - make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, NULL); - goto out1; - } - - ret = check_flags (client, client_name, - server, server_name, - TRUE); - if (ret) { - /* good error code? */ - make_err_reply(reply, KERB_ERR_NAME_EXP, NULL); - goto out1; - } - - /* - * There's no way to do pre-authentication in v4 and thus no - * good error code to return if preauthentication is required. - */ - - if (require_preauth - || client->flags.require_preauth - || server->flags.require_preauth) { - kdc_log(0, - "Pre-authentication required for v4-request: " - "%s for %s", - client_name, server_name); - make_err_reply(reply, KERB_ERR_NULL_KEY, NULL); - goto out1; - } - - ret = get_des_key(client, FALSE, &ckey); - if(ret){ - kdc_log(0, "%s", krb5_get_err_text(context, ret)); - /* XXX */ - make_err_reply(reply, KDC_NULL_KEY, - "No DES key in database (client)"); - goto out1; - } - -#if 0 - /* this is not necessary with the new code in libkrb */ - /* find a properly salted key */ - while(ckey->salt == NULL || ckey->salt->salt.length != 0) - ret = hdb_next_keytype2key(context, client, KEYTYPE_DES, &ckey); - if(ret){ - kdc_log(0, "No version-4 salted key in database -- %s.%s@%s", - name, inst, realm); - make_err_reply(reply, KDC_NULL_KEY, - "No version-4 salted key in database"); - goto out1; - } -#endif - - ret = get_des_key(server, FALSE, &skey); - if(ret){ - kdc_log(0, "%s", krb5_get_err_text(context, ret)); - /* XXX */ - make_err_reply(reply, KDC_NULL_KEY, - "No DES key in database (server)"); - goto out1; - } - - max_life = krb_life_to_time(0, life); - if(client->max_life) - max_life = min(max_life, *client->max_life); - if(server->max_life) - max_life = min(max_life, *server->max_life); - - life = krb_time_to_life(kdc_time, kdc_time + max_life); - - { - KTEXT_ST cipher, ticket; - KTEXT r; - des_cblock session; - - des_new_random_key(&session); - - krb_create_ticket(&ticket, 0, name, inst, v4_realm, - addr->sin_addr.s_addr, session, life, kdc_time, - sname, sinst, skey->key.keyvalue.data); - - create_ciph(&cipher, session, sname, sinst, v4_realm, - life, server->kvno, &ticket, kdc_time, - ckey->key.keyvalue.data); - memset(&session, 0, sizeof(session)); - r = create_auth_reply(name, inst, realm, req_time, 0, - client->pw_end ? *client->pw_end : 0, - client->kvno, &cipher); - krb5_data_copy(reply, r->dat, r->length); - memset(&cipher, 0, sizeof(cipher)); - memset(&ticket, 0, sizeof(ticket)); - } - out1: - break; - case AUTH_MSG_APPL_REQUEST: { - int8_t kvno; - int8_t ticket_len; - int8_t req_len; - KTEXT_ST auth; - AUTH_DAT ad; - size_t pos; - krb5_principal tgt_princ = NULL; - hdb_entry *tgt = NULL; - Key *tkey; - - RCHECK(krb5_ret_int8(sp, &kvno), out2); - RCHECK(krb5_ret_stringz(sp, &realm), out2); - - ret = krb5_425_conv_principal(context, "krbtgt", realm, v4_realm, - &tgt_princ); - if(ret){ - kdc_log(0, "Converting krbtgt principal: %s", - krb5_get_err_text(context, ret)); - make_err_reply(reply, KFAILURE, - "Failed to convert v4 principal (krbtgt)"); - goto out2; - } - - ret = db_fetch(tgt_princ, &tgt); - if(ret){ - char *s; - s = kdc_log_msg(0, "Ticket-granting ticket not " - "found in database: krbtgt.%s@%s: %s", - realm, v4_realm, - krb5_get_err_text(context, ret)); - make_err_reply(reply, KFAILURE, s); - free(s); - goto out2; - } - - if(tgt->kvno != kvno){ - kdc_log(0, "tgs-req with old kvno %d (current %d) for " - "krbtgt.%s@%s", kvno, tgt->kvno, realm, v4_realm); - make_err_reply(reply, KDC_AUTH_EXP, - "old krbtgt kvno used"); - goto out2; - } - - ret = get_des_key(tgt, FALSE, &tkey); - if(ret){ - kdc_log(0, "%s", krb5_get_err_text(context, ret)); - /* XXX */ - make_err_reply(reply, KDC_NULL_KEY, - "No DES key in database (krbtgt)"); - goto out2; - } - - RCHECK(krb5_ret_int8(sp, &ticket_len), out2); - RCHECK(krb5_ret_int8(sp, &req_len), out2); - - pos = sp->seek(sp, ticket_len + req_len, SEEK_CUR); - - memset(&auth, 0, sizeof(auth)); - memcpy(&auth.dat, buf, pos); - auth.length = pos; - krb_set_key(tkey->key.keyvalue.data, 0); - - krb_ignore_ip_address = !check_ticket_addresses; - - ret = krb_rd_req(&auth, "krbtgt", realm, - addr->sin_addr.s_addr, &ad, 0); - if(ret){ - kdc_log(0, "krb_rd_req: %s", krb_get_err_text(ret)); - make_err_reply(reply, ret, NULL); - goto out2; - } - - RCHECK(krb5_ret_int32(sp, &req_time), out2); - if(lsb) - req_time = swap32(req_time); - RCHECK(krb5_ret_int8(sp, &life), out2); - RCHECK(krb5_ret_stringz(sp, &sname), out2); - RCHECK(krb5_ret_stringz(sp, &sinst), out2); - snprintf (server_name, sizeof(server_name), - "%s.%s@%s", - sname, sinst, v4_realm); - - kdc_log(0, "TGS-REQ %s.%s@%s from %s for %s", - ad.pname, ad.pinst, ad.prealm, from, server_name); - - if(strcmp(ad.prealm, realm)){ - kdc_log(0, "Can't hop realms %s -> %s", realm, ad.prealm); - make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, - "Can't hop realms"); - goto out2; - } - - if(strcmp(sname, "changepw") == 0){ - kdc_log(0, "Bad request for changepw ticket"); - make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, - "Can't authorize password change based on TGT"); - goto out2; - } - -#if 0 - ret = db_fetch4(ad.pname, ad.pinst, ad.prealm, &client); - if(ret){ - char *s; - s = kdc_log_msg(0, "Client not found in database: %s.%s@%s: %s", - ad.pname, ad.pinst, ad.prealm, - krb5_get_err_text(context, ret)); - make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, s); - free(s); - goto out2; - } -#endif - - ret = db_fetch4(sname, sinst, v4_realm, &server); - if(ret){ - char *s; - s = kdc_log_msg(0, "Server not found in database: %s: %s", - server_name, krb5_get_err_text(context, ret)); - make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, s); - free(s); - goto out2; - } - - ret = check_flags (NULL, NULL, - server, server_name, - FALSE); - if (ret) { - /* good error code? */ - make_err_reply(reply, KERB_ERR_NAME_EXP, NULL); - goto out2; - } - - ret = get_des_key(server, FALSE, &skey); - if(ret){ - kdc_log(0, "%s", krb5_get_err_text(context, ret)); - /* XXX */ - make_err_reply(reply, KDC_NULL_KEY, - "No DES key in database (server)"); - goto out2; - } - - max_life = krb_life_to_time(ad.time_sec, ad.life); - max_life = min(max_life, krb_life_to_time(kdc_time, life)); - life = min(life, krb_time_to_life(kdc_time, max_life)); - max_life = krb_life_to_time(0, life); -#if 0 - if(client->max_life) - max_life = min(max_life, *client->max_life); -#endif - if(server->max_life) - max_life = min(max_life, *server->max_life); - - { - KTEXT_ST cipher, ticket; - KTEXT r; - des_cblock session; - des_new_random_key(&session); - krb_create_ticket(&ticket, 0, ad.pname, ad.pinst, ad.prealm, - addr->sin_addr.s_addr, &session, life, kdc_time, - sname, sinst, skey->key.keyvalue.data); - - create_ciph(&cipher, session, sname, sinst, v4_realm, - life, server->kvno, &ticket, - kdc_time, &ad.session); - - memset(&session, 0, sizeof(session)); - memset(ad.session, 0, sizeof(ad.session)); - - r = create_auth_reply(ad.pname, ad.pinst, ad.prealm, - req_time, 0, 0, 0, &cipher); - krb5_data_copy(reply, r->dat, r->length); - memset(&cipher, 0, sizeof(cipher)); - memset(&ticket, 0, sizeof(ticket)); - } - out2: - if(tgt_princ) - krb5_free_principal(context, tgt_princ); - if(tgt) - free_ent(tgt); - break; - } - - case AUTH_MSG_ERR_REPLY: - break; - default: - kdc_log(0, "Unknown message type: %d from %s", - msg_type, from); - - make_err_reply(reply, KFAILURE, "Unknown message type"); - } -out: - if(name) - free(name); - if(inst) - free(inst); - if(realm) - free(realm); - if(sname) - free(sname); - if(sinst) - free(sinst); - if(client) - free_ent(client); - if(server) - free_ent(server); - krb5_storage_free(sp); - return 0; -} - - -#define ETYPE_DES_PCBC 17 /* XXX */ - -krb5_error_code -encrypt_v4_ticket(void *buf, size_t len, des_cblock *key, EncryptedData *reply) -{ - des_key_schedule schedule; - - reply->etype = ETYPE_DES_PCBC; - reply->kvno = NULL; - reply->cipher.length = len; - reply->cipher.data = malloc(len); - if(len != 0 && reply->cipher.data == NULL) - return ENOMEM; - des_set_key(key, schedule); - des_pcbc_encrypt(buf, - reply->cipher.data, - len, - schedule, - key, - DES_ENCRYPT); - memset(schedule, 0, sizeof(schedule)); - return 0; -} - -krb5_error_code -encode_v4_ticket(void *buf, size_t len, const EncTicketPart *et, - const PrincipalName *service, size_t *size) -{ - krb5_storage *sp; - krb5_error_code ret; - char name[40], inst[40], realm[40]; - char sname[40], sinst[40]; - - { - krb5_principal princ; - principalname2krb5_principal(&princ, - *service, - et->crealm); - ret = krb5_524_conv_principal(context, - princ, - sname, - sinst, - realm); - krb5_free_principal(context, princ); - if(ret) - return ret; - - principalname2krb5_principal(&princ, - et->cname, - et->crealm); - - ret = krb5_524_conv_principal(context, - princ, - name, - inst, - realm); - krb5_free_principal(context, princ); - } - if(ret) - return ret; - - sp = krb5_storage_emem(); - - krb5_store_int8(sp, 0); /* flags */ - krb5_store_stringz(sp, name); - krb5_store_stringz(sp, inst); - krb5_store_stringz(sp, realm); - { - unsigned char tmp[4] = { 0, 0, 0, 0 }; - int i; - if(et->caddr){ - for(i = 0; i < et->caddr->len; i++) - if(et->caddr->val[i].addr_type == AF_INET && - et->caddr->val[i].address.length == 4){ - memcpy(tmp, et->caddr->val[i].address.data, 4); - break; - } - } - sp->store(sp, tmp, sizeof(tmp)); - } - - if((et->key.keytype != ETYPE_DES_CBC_MD5 && - et->key.keytype != ETYPE_DES_CBC_MD4 && - et->key.keytype != ETYPE_DES_CBC_CRC) || - et->key.keyvalue.length != 8) - return -1; - sp->store(sp, et->key.keyvalue.data, 8); - - { - time_t start = et->starttime ? *et->starttime : et->authtime; - krb5_store_int8(sp, krb_time_to_life(start, et->endtime)); - krb5_store_int32(sp, start); - } - - krb5_store_stringz(sp, sname); - krb5_store_stringz(sp, sinst); - - { - krb5_data data; - krb5_storage_to_data(sp, &data); - krb5_storage_free(sp); - *size = (data.length + 7) & ~7; /* pad to 8 bytes */ - if(*size > len) - return -1; - memset((unsigned char*)buf - *size + 1, 0, *size); - memcpy((unsigned char*)buf - *size + 1, data.data, data.length); - krb5_data_free(&data); - } - return 0; -} - -#endif /* KRB4 */ |