1 /* 2 * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <krb5_locl.h> 35 36 RCSID("$Id: get_for_creds.c,v 1.31 2001/07/19 17:33:22 assar Exp $"); 37 38 static krb5_error_code 39 add_addrs(krb5_context context, 40 krb5_addresses *addr, 41 struct addrinfo *ai) 42 { 43 krb5_error_code ret; 44 unsigned n, i, j; 45 void *tmp; 46 struct addrinfo *a; 47 48 n = 0; 49 for (a = ai; a != NULL; a = a->ai_next) 50 ++n; 51 52 i = addr->len; 53 addr->len += n; 54 tmp = realloc(addr->val, addr->len * sizeof(*addr->val)); 55 if (tmp == NULL) { 56 krb5_set_error_string(context, "malloc: out of memory"); 57 ret = ENOMEM; 58 goto fail; 59 } 60 addr->val = tmp; 61 for (j = i; j < addr->len; ++j) { 62 addr->val[i].addr_type = 0; 63 krb5_data_zero(&addr->val[i].address); 64 } 65 for (a = ai; a != NULL; a = a->ai_next) { 66 ret = krb5_sockaddr2address (context, a->ai_addr, &addr->val[i]); 67 if (ret == 0) 68 ++i; 69 else if (ret == KRB5_PROG_ATYPE_NOSUPP) 70 krb5_clear_error_string (context); 71 else 72 goto fail; 73 } 74 addr->len = i; 75 return 0; 76 fail: 77 krb5_free_addresses (context, addr); 78 return ret; 79 } 80 81 /* 82 * Forward credentials for `client' to host `hostname`, 83 * making them forwardable if `forwardable', and returning the 84 * blob of data to sent in `out_data'. 85 * If hostname == NULL, pick it from `server' 86 */ 87 88 krb5_error_code 89 krb5_fwd_tgt_creds (krb5_context context, 90 krb5_auth_context auth_context, 91 const char *hostname, 92 krb5_principal client, 93 krb5_principal server, 94 krb5_ccache ccache, 95 int forwardable, 96 krb5_data *out_data) 97 { 98 krb5_flags flags = 0; 99 krb5_creds creds; 100 krb5_error_code ret; 101 krb5_const_realm client_realm; 102 103 flags |= KDC_OPT_FORWARDED; 104 105 if (forwardable) 106 flags |= KDC_OPT_FORWARDABLE; 107 108 if (hostname == NULL && 109 krb5_principal_get_type(context, server) == KRB5_NT_SRV_HST) { 110 const char *inst = krb5_principal_get_comp_string(context, server, 0); 111 const char *host = krb5_principal_get_comp_string(context, server, 1); 112 113 if (inst != NULL && 114 strcmp(inst, "host") == 0 && 115 host != NULL && 116 krb5_principal_get_comp_string(context, server, 2) == NULL) 117 hostname = host; 118 } 119 120 client_realm = krb5_principal_get_realm(context, client); 121 122 memset (&creds, 0, sizeof(creds)); 123 creds.client = client; 124 125 ret = krb5_build_principal(context, 126 &creds.server, 127 strlen(client_realm), 128 client_realm, 129 KRB5_TGS_NAME, 130 client_realm, 131 NULL); 132 if (ret) 133 return ret; 134 135 ret = krb5_get_forwarded_creds (context, 136 auth_context, 137 ccache, 138 flags, 139 hostname, 140 &creds, 141 out_data); 142 return ret; 143 } 144 145 /* 146 * 147 */ 148 149 krb5_error_code 150 krb5_get_forwarded_creds (krb5_context context, 151 krb5_auth_context auth_context, 152 krb5_ccache ccache, 153 krb5_flags flags, 154 const char *hostname, 155 krb5_creds *in_creds, 156 krb5_data *out_data) 157 { 158 krb5_error_code ret; 159 krb5_creds *out_creds; 160 krb5_addresses addrs; 161 KRB_CRED cred; 162 KrbCredInfo *krb_cred_info; 163 EncKrbCredPart enc_krb_cred_part; 164 size_t len; 165 u_char buf[1024]; 166 int32_t sec, usec; 167 krb5_kdc_flags kdc_flags; 168 krb5_crypto crypto; 169 struct addrinfo *ai; 170 int save_errno; 171 172 addrs.len = 0; 173 addrs.val = NULL; 174 175 ret = getaddrinfo (hostname, NULL, NULL, &ai); 176 if (ret) { 177 save_errno = errno; 178 krb5_set_error_string(context, "resolving %s: %s", 179 hostname, gai_strerror(ret)); 180 return krb5_eai_to_heim_errno(ret, save_errno); 181 } 182 183 ret = add_addrs (context, &addrs, ai); 184 freeaddrinfo (ai); 185 if (ret) 186 return ret; 187 188 kdc_flags.i = flags; 189 190 ret = krb5_get_kdc_cred (context, 191 ccache, 192 kdc_flags, 193 &addrs, 194 NULL, 195 in_creds, 196 &out_creds); 197 krb5_free_addresses (context, &addrs); 198 if (ret) { 199 return ret; 200 } 201 202 memset (&cred, 0, sizeof(cred)); 203 cred.pvno = 5; 204 cred.msg_type = krb_cred; 205 ALLOC_SEQ(&cred.tickets, 1); 206 if (cred.tickets.val == NULL) { 207 ret = ENOMEM; 208 krb5_set_error_string(context, "malloc: out of memory"); 209 goto out2; 210 } 211 ret = decode_Ticket(out_creds->ticket.data, 212 out_creds->ticket.length, 213 cred.tickets.val, &len); 214 if (ret) 215 goto out3; 216 217 memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part)); 218 ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1); 219 if (enc_krb_cred_part.ticket_info.val == NULL) { 220 ret = ENOMEM; 221 krb5_set_error_string(context, "malloc: out of memory"); 222 goto out4; 223 } 224 225 krb5_us_timeofday (context, &sec, &usec); 226 227 ALLOC(enc_krb_cred_part.timestamp, 1); 228 if (enc_krb_cred_part.timestamp == NULL) { 229 ret = ENOMEM; 230 krb5_set_error_string(context, "malloc: out of memory"); 231 goto out4; 232 } 233 *enc_krb_cred_part.timestamp = sec; 234 ALLOC(enc_krb_cred_part.usec, 1); 235 if (enc_krb_cred_part.usec == NULL) { 236 ret = ENOMEM; 237 krb5_set_error_string(context, "malloc: out of memory"); 238 goto out4; 239 } 240 *enc_krb_cred_part.usec = usec; 241 242 if (auth_context->local_address && auth_context->local_port) { 243 krb5_boolean noaddr; 244 const krb5_realm *realm; 245 246 realm = krb5_princ_realm(context, out_creds->server); 247 krb5_appdefault_boolean(context, NULL, *realm, "no-addresses", FALSE, 248 &noaddr); 249 if (!noaddr) { 250 ret = krb5_make_addrport (context, 251 &enc_krb_cred_part.s_address, 252 auth_context->local_address, 253 auth_context->local_port); 254 if (ret) 255 goto out4; 256 } 257 } 258 259 if (auth_context->remote_address) { 260 ALLOC(enc_krb_cred_part.r_address, 1); 261 if (enc_krb_cred_part.r_address == NULL) { 262 ret = ENOMEM; 263 krb5_set_error_string(context, "malloc: out of memory"); 264 goto out4; 265 } 266 267 ret = krb5_copy_address (context, auth_context->remote_address, 268 enc_krb_cred_part.r_address); 269 if (ret) 270 goto out4; 271 } 272 273 /* fill ticket_info.val[0] */ 274 275 enc_krb_cred_part.ticket_info.len = 1; 276 277 krb_cred_info = enc_krb_cred_part.ticket_info.val; 278 279 copy_EncryptionKey (&out_creds->session, &krb_cred_info->key); 280 ALLOC(krb_cred_info->prealm, 1); 281 copy_Realm (&out_creds->client->realm, krb_cred_info->prealm); 282 ALLOC(krb_cred_info->pname, 1); 283 copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname); 284 ALLOC(krb_cred_info->flags, 1); 285 *krb_cred_info->flags = out_creds->flags.b; 286 ALLOC(krb_cred_info->authtime, 1); 287 *krb_cred_info->authtime = out_creds->times.authtime; 288 ALLOC(krb_cred_info->starttime, 1); 289 *krb_cred_info->starttime = out_creds->times.starttime; 290 ALLOC(krb_cred_info->endtime, 1); 291 *krb_cred_info->endtime = out_creds->times.endtime; 292 ALLOC(krb_cred_info->renew_till, 1); 293 *krb_cred_info->renew_till = out_creds->times.renew_till; 294 ALLOC(krb_cred_info->srealm, 1); 295 copy_Realm (&out_creds->server->realm, krb_cred_info->srealm); 296 ALLOC(krb_cred_info->sname, 1); 297 copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname); 298 ALLOC(krb_cred_info->caddr, 1); 299 copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr); 300 301 krb5_free_creds (context, out_creds); 302 303 /* encode EncKrbCredPart */ 304 305 ret = krb5_encode_EncKrbCredPart (context, 306 buf + sizeof(buf) - 1, sizeof(buf), 307 &enc_krb_cred_part, &len); 308 free_EncKrbCredPart (&enc_krb_cred_part); 309 if (ret) { 310 free_KRB_CRED(&cred); 311 return ret; 312 } 313 314 ret = krb5_crypto_init(context, auth_context->local_subkey, 0, &crypto); 315 if (ret) { 316 free_KRB_CRED(&cred); 317 return ret; 318 } 319 ret = krb5_encrypt_EncryptedData (context, 320 crypto, 321 KRB5_KU_KRB_CRED, 322 buf + sizeof(buf) - len, 323 len, 324 0, 325 &cred.enc_part); 326 krb5_crypto_destroy(context, crypto); 327 if (ret) { 328 free_KRB_CRED(&cred); 329 return ret; 330 } 331 332 ret = encode_KRB_CRED (buf + sizeof(buf) - 1, sizeof(buf), 333 &cred, &len); 334 free_KRB_CRED (&cred); 335 if (ret) 336 return ret; 337 out_data->length = len; 338 out_data->data = malloc(len); 339 if (out_data->data == NULL) { 340 krb5_set_error_string(context, "malloc: out of memory"); 341 return ENOMEM; 342 } 343 memcpy (out_data->data, buf + sizeof(buf) - len, len); 344 return 0; 345 out4: 346 free_EncKrbCredPart(&enc_krb_cred_part); 347 out3: 348 free_KRB_CRED(&cred); 349 out2: 350 krb5_free_creds (context, out_creds); 351 return ret; 352 } 353