155682Smarkm/* 2178825Sdfr * Copyright (c) 1997 - 2004 Kungliga Tekniska H�gskolan 355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden). 455682Smarkm * All rights reserved. 555682Smarkm * 655682Smarkm * Redistribution and use in source and binary forms, with or without 755682Smarkm * modification, are permitted provided that the following conditions 855682Smarkm * are met: 955682Smarkm * 1055682Smarkm * 1. Redistributions of source code must retain the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer. 1255682Smarkm * 1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1455682Smarkm * notice, this list of conditions and the following disclaimer in the 1555682Smarkm * documentation and/or other materials provided with the distribution. 1655682Smarkm * 1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors 1855682Smarkm * may be used to endorse or promote products derived from this software 1955682Smarkm * without specific prior written permission. 2055682Smarkm * 2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2455682Smarkm * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3155682Smarkm * SUCH DAMAGE. 3255682Smarkm */ 3355682Smarkm 3455682Smarkm#include <krb5_locl.h> 3555682Smarkm 36178825SdfrRCSID("$Id: get_for_creds.c 22504 2008-01-21 15:49:58Z lha $"); 3755682Smarkm 3855682Smarkmstatic krb5_error_code 3955682Smarkmadd_addrs(krb5_context context, 4055682Smarkm krb5_addresses *addr, 4155682Smarkm struct addrinfo *ai) 4255682Smarkm{ 4355682Smarkm krb5_error_code ret; 44127808Snectar unsigned n, i; 4555682Smarkm void *tmp; 4655682Smarkm struct addrinfo *a; 4755682Smarkm 4855682Smarkm n = 0; 4955682Smarkm for (a = ai; a != NULL; a = a->ai_next) 5055682Smarkm ++n; 5155682Smarkm 52127808Snectar tmp = realloc(addr->val, (addr->len + n) * sizeof(*addr->val)); 53178825Sdfr if (tmp == NULL && (addr->len + n) != 0) { 5478527Sassar krb5_set_error_string(context, "malloc: out of memory"); 5555682Smarkm ret = ENOMEM; 5655682Smarkm goto fail; 5755682Smarkm } 5855682Smarkm addr->val = tmp; 59127808Snectar for (i = addr->len; i < (addr->len + n); ++i) { 6072445Sassar addr->val[i].addr_type = 0; 6172445Sassar krb5_data_zero(&addr->val[i].address); 6272445Sassar } 63127808Snectar i = addr->len; 6455682Smarkm for (a = ai; a != NULL; a = a->ai_next) { 65127808Snectar krb5_address ad; 66127808Snectar 67127808Snectar ret = krb5_sockaddr2address (context, a->ai_addr, &ad); 68127808Snectar if (ret == 0) { 69127808Snectar if (krb5_address_search(context, &ad, addr)) 70127808Snectar krb5_free_address(context, &ad); 71127808Snectar else 72127808Snectar addr->val[i++] = ad; 73127808Snectar } 7478527Sassar else if (ret == KRB5_PROG_ATYPE_NOSUPP) 7578527Sassar krb5_clear_error_string (context); 7678527Sassar else 7755682Smarkm goto fail; 78127808Snectar addr->len = i; 7955682Smarkm } 8055682Smarkm return 0; 8155682Smarkmfail: 8255682Smarkm krb5_free_addresses (context, addr); 8355682Smarkm return ret; 8455682Smarkm} 8555682Smarkm 86178825Sdfr/** 87178825Sdfr * Forward credentials for client to host hostname , making them 88178825Sdfr * forwardable if forwardable, and returning the blob of data to sent 89178825Sdfr * in out_data. If hostname == NULL, pick it from server. 90178825Sdfr * 91178825Sdfr * @param context A kerberos 5 context. 92178825Sdfr * @param auth_context the auth context with the key to encrypt the out_data. 93178825Sdfr * @param hostname the host to forward the tickets too. 94178825Sdfr * @param client the client to delegate from. 95178825Sdfr * @param server the server to delegate the credential too. 96178825Sdfr * @param ccache credential cache to use. 97178825Sdfr * @param forwardable make the forwarded ticket forwabledable. 98178825Sdfr * @param out_data the resulting credential. 99178825Sdfr * 100178825Sdfr * @return Return an error code or 0. 101178825Sdfr * 102178825Sdfr * @ingroup krb5_credential 10355682Smarkm */ 10455682Smarkm 105178825Sdfrkrb5_error_code KRB5_LIB_FUNCTION 10655682Smarkmkrb5_fwd_tgt_creds (krb5_context context, 10755682Smarkm krb5_auth_context auth_context, 10855682Smarkm const char *hostname, 10955682Smarkm krb5_principal client, 11055682Smarkm krb5_principal server, 11155682Smarkm krb5_ccache ccache, 11255682Smarkm int forwardable, 11355682Smarkm krb5_data *out_data) 11455682Smarkm{ 11555682Smarkm krb5_flags flags = 0; 11655682Smarkm krb5_creds creds; 11755682Smarkm krb5_error_code ret; 11890926Snectar krb5_const_realm client_realm; 11955682Smarkm 12055682Smarkm flags |= KDC_OPT_FORWARDED; 12155682Smarkm 12255682Smarkm if (forwardable) 12355682Smarkm flags |= KDC_OPT_FORWARDABLE; 12455682Smarkm 12590926Snectar if (hostname == NULL && 12690926Snectar krb5_principal_get_type(context, server) == KRB5_NT_SRV_HST) { 12790926Snectar const char *inst = krb5_principal_get_comp_string(context, server, 0); 12890926Snectar const char *host = krb5_principal_get_comp_string(context, server, 1); 12990926Snectar 13090926Snectar if (inst != NULL && 13190926Snectar strcmp(inst, "host") == 0 && 13290926Snectar host != NULL && 13390926Snectar krb5_principal_get_comp_string(context, server, 2) == NULL) 13490926Snectar hostname = host; 13590926Snectar } 13690926Snectar 13790926Snectar client_realm = krb5_principal_get_realm(context, client); 13855682Smarkm 13955682Smarkm memset (&creds, 0, sizeof(creds)); 14055682Smarkm creds.client = client; 14155682Smarkm 14290926Snectar ret = krb5_build_principal(context, 14390926Snectar &creds.server, 14490926Snectar strlen(client_realm), 14590926Snectar client_realm, 14690926Snectar KRB5_TGS_NAME, 14790926Snectar client_realm, 14890926Snectar NULL); 14990926Snectar if (ret) 15090926Snectar return ret; 15190926Snectar 15255682Smarkm ret = krb5_get_forwarded_creds (context, 15355682Smarkm auth_context, 15455682Smarkm ccache, 15555682Smarkm flags, 15655682Smarkm hostname, 15755682Smarkm &creds, 15855682Smarkm out_data); 15955682Smarkm return ret; 16055682Smarkm} 16155682Smarkm 162178825Sdfr/** 163178825Sdfr * Gets tickets forwarded to hostname. If the tickets that are 164178825Sdfr * forwarded are address-less, the forwarded tickets will also be 165178825Sdfr * address-less. 166178825Sdfr * 167178825Sdfr * If the ticket have any address, hostname will be used for figure 168178825Sdfr * out the address to forward the ticket too. This since this might 169178825Sdfr * use DNS, its insecure and also doesn't represent configured all 170178825Sdfr * addresses of the host. For example, the host might have two 171178825Sdfr * adresses, one IPv4 and one IPv6 address where the later is not 172178825Sdfr * published in DNS. This IPv6 address might be used communications 173178825Sdfr * and thus the resulting ticket useless. 17455682Smarkm * 175178825Sdfr * @param context A kerberos 5 context. 176178825Sdfr * @param auth_context the auth context with the key to encrypt the out_data. 177178825Sdfr * @param ccache credential cache to use 178178825Sdfr * @param flags the flags to control the resulting ticket flags 179178825Sdfr * @param hostname the host to forward the tickets too. 180178825Sdfr * @param in_creds the in client and server ticket names. The client 181178825Sdfr * and server components forwarded to the remote host. 182178825Sdfr * @param out_data the resulting credential. 183178825Sdfr * 184178825Sdfr * @return Return an error code or 0. 185178825Sdfr * 186178825Sdfr * @ingroup krb5_credential 18755682Smarkm */ 18855682Smarkm 189178825Sdfrkrb5_error_code KRB5_LIB_FUNCTION 19055682Smarkmkrb5_get_forwarded_creds (krb5_context context, 19155682Smarkm krb5_auth_context auth_context, 19255682Smarkm krb5_ccache ccache, 19355682Smarkm krb5_flags flags, 19455682Smarkm const char *hostname, 19555682Smarkm krb5_creds *in_creds, 19655682Smarkm krb5_data *out_data) 19755682Smarkm{ 19855682Smarkm krb5_error_code ret; 19955682Smarkm krb5_creds *out_creds; 200127808Snectar krb5_addresses addrs, *paddrs; 20155682Smarkm KRB_CRED cred; 20255682Smarkm KrbCredInfo *krb_cred_info; 20355682Smarkm EncKrbCredPart enc_krb_cred_part; 20455682Smarkm size_t len; 205103423Snectar unsigned char *buf; 206103423Snectar size_t buf_size; 20755682Smarkm krb5_kdc_flags kdc_flags; 20855682Smarkm krb5_crypto crypto; 20955682Smarkm struct addrinfo *ai; 21078527Sassar int save_errno; 211127808Snectar krb5_creds *ticket; 21255682Smarkm 213178825Sdfr paddrs = NULL; 21455682Smarkm addrs.len = 0; 21555682Smarkm addrs.val = NULL; 21655682Smarkm 217178825Sdfr ret = krb5_get_credentials(context, 0, ccache, in_creds, &ticket); 218178825Sdfr if(ret == 0) { 219178825Sdfr if (ticket->addresses.len) 220178825Sdfr paddrs = &addrs; 221178825Sdfr krb5_free_creds (context, ticket); 222178825Sdfr } else { 223178825Sdfr krb5_boolean noaddr; 224178825Sdfr krb5_appdefault_boolean(context, NULL, 225178825Sdfr krb5_principal_get_realm(context, 226178825Sdfr in_creds->client), 227178825Sdfr "no-addresses", KRB5_ADDRESSLESS_DEFAULT, 228178825Sdfr &noaddr); 229178825Sdfr if (!noaddr) 230178825Sdfr paddrs = &addrs; 231178825Sdfr } 232178825Sdfr 233127808Snectar /* 234178825Sdfr * If tickets have addresses, get the address of the remote host. 235127808Snectar */ 236127808Snectar 237127808Snectar if (paddrs != NULL) { 23855682Smarkm 239127808Snectar ret = getaddrinfo (hostname, NULL, NULL, &ai); 240127808Snectar if (ret) { 241127808Snectar save_errno = errno; 242127808Snectar krb5_set_error_string(context, "resolving %s: %s", 243127808Snectar hostname, gai_strerror(ret)); 244127808Snectar return krb5_eai_to_heim_errno(ret, save_errno); 245127808Snectar } 246127808Snectar 247127808Snectar ret = add_addrs (context, &addrs, ai); 248127808Snectar freeaddrinfo (ai); 249127808Snectar if (ret) 250127808Snectar return ret; 251127808Snectar } 252127808Snectar 253178825Sdfr kdc_flags.b = int2KDCOptions(flags); 25455682Smarkm 25555682Smarkm ret = krb5_get_kdc_cred (context, 25655682Smarkm ccache, 25755682Smarkm kdc_flags, 258127808Snectar paddrs, 25955682Smarkm NULL, 26055682Smarkm in_creds, 26155682Smarkm &out_creds); 26255682Smarkm krb5_free_addresses (context, &addrs); 263178825Sdfr if (ret) 26455682Smarkm return ret; 26555682Smarkm 26655682Smarkm memset (&cred, 0, sizeof(cred)); 26755682Smarkm cred.pvno = 5; 26855682Smarkm cred.msg_type = krb_cred; 26955682Smarkm ALLOC_SEQ(&cred.tickets, 1); 27055682Smarkm if (cred.tickets.val == NULL) { 27155682Smarkm ret = ENOMEM; 27278527Sassar krb5_set_error_string(context, "malloc: out of memory"); 27355682Smarkm goto out2; 27455682Smarkm } 27555682Smarkm ret = decode_Ticket(out_creds->ticket.data, 27655682Smarkm out_creds->ticket.length, 27755682Smarkm cred.tickets.val, &len); 27855682Smarkm if (ret) 27955682Smarkm goto out3; 28055682Smarkm 28155682Smarkm memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part)); 28255682Smarkm ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1); 28355682Smarkm if (enc_krb_cred_part.ticket_info.val == NULL) { 28455682Smarkm ret = ENOMEM; 28578527Sassar krb5_set_error_string(context, "malloc: out of memory"); 28655682Smarkm goto out4; 28755682Smarkm } 28855682Smarkm 289127808Snectar if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 290178825Sdfr krb5_timestamp sec; 291178825Sdfr int32_t usec; 292127808Snectar 293127808Snectar krb5_us_timeofday (context, &sec, &usec); 294127808Snectar 295127808Snectar ALLOC(enc_krb_cred_part.timestamp, 1); 296127808Snectar if (enc_krb_cred_part.timestamp == NULL) { 297127808Snectar ret = ENOMEM; 298127808Snectar krb5_set_error_string(context, "malloc: out of memory"); 299127808Snectar goto out4; 300127808Snectar } 301127808Snectar *enc_krb_cred_part.timestamp = sec; 302127808Snectar ALLOC(enc_krb_cred_part.usec, 1); 303127808Snectar if (enc_krb_cred_part.usec == NULL) { 304127808Snectar ret = ENOMEM; 305127808Snectar krb5_set_error_string(context, "malloc: out of memory"); 306127808Snectar goto out4; 307127808Snectar } 308127808Snectar *enc_krb_cred_part.usec = usec; 309127808Snectar } else { 310127808Snectar enc_krb_cred_part.timestamp = NULL; 311127808Snectar enc_krb_cred_part.usec = NULL; 31255682Smarkm } 31355682Smarkm 314178825Sdfr if (auth_context->local_address && auth_context->local_port && paddrs) { 31590926Snectar 316178825Sdfr ret = krb5_make_addrport (context, 317178825Sdfr &enc_krb_cred_part.s_address, 318178825Sdfr auth_context->local_address, 319178825Sdfr auth_context->local_port); 320178825Sdfr if (ret) 321178825Sdfr goto out4; 32272445Sassar } 32355682Smarkm 32472445Sassar if (auth_context->remote_address) { 325102644Snectar if (auth_context->remote_port) { 326102644Snectar krb5_boolean noaddr; 327178825Sdfr krb5_const_realm srealm; 328102644Snectar 329178825Sdfr srealm = krb5_principal_get_realm(context, out_creds->server); 330178825Sdfr /* Is this correct, and should we use the paddrs == NULL 331178825Sdfr trick here as well? Having an address-less ticket may 332178825Sdfr indicate that we don't know our own global address, but 333178825Sdfr it does not necessary mean that we don't know the 334178825Sdfr server's. */ 335178825Sdfr krb5_appdefault_boolean(context, NULL, srealm, "no-addresses", 336102644Snectar FALSE, &noaddr); 337102644Snectar if (!noaddr) { 338102644Snectar ret = krb5_make_addrport (context, 339102644Snectar &enc_krb_cred_part.r_address, 340102644Snectar auth_context->remote_address, 341102644Snectar auth_context->remote_port); 342102644Snectar if (ret) 343102644Snectar goto out4; 344102644Snectar } 345102644Snectar } else { 346102644Snectar ALLOC(enc_krb_cred_part.r_address, 1); 347102644Snectar if (enc_krb_cred_part.r_address == NULL) { 348102644Snectar ret = ENOMEM; 349102644Snectar krb5_set_error_string(context, "malloc: out of memory"); 350102644Snectar goto out4; 351102644Snectar } 352102644Snectar 353102644Snectar ret = krb5_copy_address (context, auth_context->remote_address, 354102644Snectar enc_krb_cred_part.r_address); 355102644Snectar if (ret) 356102644Snectar goto out4; 35772445Sassar } 35855682Smarkm } 35955682Smarkm 36055682Smarkm /* fill ticket_info.val[0] */ 36155682Smarkm 36255682Smarkm enc_krb_cred_part.ticket_info.len = 1; 36355682Smarkm 36455682Smarkm krb_cred_info = enc_krb_cred_part.ticket_info.val; 36555682Smarkm 36655682Smarkm copy_EncryptionKey (&out_creds->session, &krb_cred_info->key); 36755682Smarkm ALLOC(krb_cred_info->prealm, 1); 36855682Smarkm copy_Realm (&out_creds->client->realm, krb_cred_info->prealm); 36955682Smarkm ALLOC(krb_cred_info->pname, 1); 37055682Smarkm copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname); 37155682Smarkm ALLOC(krb_cred_info->flags, 1); 37255682Smarkm *krb_cred_info->flags = out_creds->flags.b; 37355682Smarkm ALLOC(krb_cred_info->authtime, 1); 37455682Smarkm *krb_cred_info->authtime = out_creds->times.authtime; 37555682Smarkm ALLOC(krb_cred_info->starttime, 1); 37655682Smarkm *krb_cred_info->starttime = out_creds->times.starttime; 37755682Smarkm ALLOC(krb_cred_info->endtime, 1); 37855682Smarkm *krb_cred_info->endtime = out_creds->times.endtime; 37955682Smarkm ALLOC(krb_cred_info->renew_till, 1); 38055682Smarkm *krb_cred_info->renew_till = out_creds->times.renew_till; 38155682Smarkm ALLOC(krb_cred_info->srealm, 1); 38255682Smarkm copy_Realm (&out_creds->server->realm, krb_cred_info->srealm); 38355682Smarkm ALLOC(krb_cred_info->sname, 1); 38455682Smarkm copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname); 38555682Smarkm ALLOC(krb_cred_info->caddr, 1); 38655682Smarkm copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr); 38755682Smarkm 38855682Smarkm krb5_free_creds (context, out_creds); 38955682Smarkm 39055682Smarkm /* encode EncKrbCredPart */ 39155682Smarkm 392103423Snectar ASN1_MALLOC_ENCODE(EncKrbCredPart, buf, buf_size, 393103423Snectar &enc_krb_cred_part, &len, ret); 39455682Smarkm free_EncKrbCredPart (&enc_krb_cred_part); 39555682Smarkm if (ret) { 39655682Smarkm free_KRB_CRED(&cred); 39755682Smarkm return ret; 398103423Snectar } 399103423Snectar if(buf_size != len) 400103423Snectar krb5_abortx(context, "internal error in ASN.1 encoder"); 40155682Smarkm 402178825Sdfr /** 403178825Sdfr * Some older of the MIT gssapi library used clear-text tickets 404178825Sdfr * (warped inside AP-REQ encryption), use the krb5_auth_context 405178825Sdfr * flag KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED to support those 406178825Sdfr * tickets. The session key is used otherwise to encrypt the 407178825Sdfr * forwarded ticket. 408178825Sdfr */ 409103423Snectar 410178825Sdfr if (auth_context->flags & KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED) { 411178825Sdfr cred.enc_part.etype = ENCTYPE_NULL; 412178825Sdfr cred.enc_part.kvno = NULL; 413178825Sdfr cred.enc_part.cipher.data = buf; 414178825Sdfr cred.enc_part.cipher.length = buf_size; 415178825Sdfr } else { 416178825Sdfr /* 417178825Sdfr * Here older versions then 0.7.2 of Heimdal used the local or 418178825Sdfr * remote subkey. That is wrong, the session key should be 419178825Sdfr * used. Heimdal 0.7.2 and newer have code to try both in the 420178825Sdfr * receiving end. 421178825Sdfr */ 422178825Sdfr 423178825Sdfr ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto); 424178825Sdfr if (ret) { 425178825Sdfr free(buf); 426178825Sdfr free_KRB_CRED(&cred); 427178825Sdfr return ret; 428178825Sdfr } 429178825Sdfr ret = krb5_encrypt_EncryptedData (context, 430178825Sdfr crypto, 431178825Sdfr KRB5_KU_KRB_CRED, 432178825Sdfr buf, 433178825Sdfr len, 434178825Sdfr 0, 435178825Sdfr &cred.enc_part); 436103423Snectar free(buf); 437178825Sdfr krb5_crypto_destroy(context, crypto); 438178825Sdfr if (ret) { 439178825Sdfr free_KRB_CRED(&cred); 440178825Sdfr return ret; 441178825Sdfr } 44272445Sassar } 44355682Smarkm 444103423Snectar ASN1_MALLOC_ENCODE(KRB_CRED, buf, buf_size, &cred, &len, ret); 44555682Smarkm free_KRB_CRED (&cred); 44655682Smarkm if (ret) 44755682Smarkm return ret; 448103423Snectar if(buf_size != len) 449103423Snectar krb5_abortx(context, "internal error in ASN.1 encoder"); 45055682Smarkm out_data->length = len; 451103423Snectar out_data->data = buf; 45255682Smarkm return 0; 453127808Snectar out4: 45455682Smarkm free_EncKrbCredPart(&enc_krb_cred_part); 455127808Snectar out3: 45655682Smarkm free_KRB_CRED(&cred); 457127808Snectar out2: 45855682Smarkm krb5_free_creds (context, out_creds); 45955682Smarkm return ret; 46055682Smarkm} 461