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 1.29 2001/05/14 22:49:55 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 * 83 */ 84 85 krb5_error_code 86 krb5_fwd_tgt_creds (krb5_context context, 87 krb5_auth_context auth_context, 88 const char *hostname, 89 krb5_principal client, 90 krb5_principal server, 91 krb5_ccache ccache, 92 int forwardable, 93 krb5_data *out_data) 94 { 95 krb5_flags flags = 0; 96 krb5_creds creds; 97 krb5_error_code ret; 98 99 flags |= KDC_OPT_FORWARDED; 100 101 if (forwardable) 102 flags |= KDC_OPT_FORWARDABLE; 103 104 105 memset (&creds, 0, sizeof(creds)); 106 creds.client = client; 107 creds.server = server; 108 109 ret = krb5_get_forwarded_creds (context, 110 auth_context, 111 ccache, 112 flags, 113 hostname, 114 &creds, 115 out_data); 116 return ret; 117 } 118 119 /* 120 * 121 */ 122 123 krb5_error_code 124 krb5_get_forwarded_creds (krb5_context context, 125 krb5_auth_context auth_context, 126 krb5_ccache ccache, 127 krb5_flags flags, 128 const char *hostname, 129 krb5_creds *in_creds, 130 krb5_data *out_data) 131 { 132 krb5_error_code ret; 133 krb5_creds *out_creds; 134 krb5_addresses addrs; 135 KRB_CRED cred; 136 KrbCredInfo *krb_cred_info; 137 EncKrbCredPart enc_krb_cred_part; 138 size_t len; 139 u_char buf[1024]; 140 int32_t sec, usec; 141 krb5_kdc_flags kdc_flags; 142 krb5_crypto crypto; 143 struct addrinfo *ai; 144 int save_errno; 145 146 addrs.len = 0; 147 addrs.val = NULL; 148 149 ret = getaddrinfo (hostname, NULL, NULL, &ai); 150 if (ret) { 151 save_errno = errno; 152 krb5_set_error_string(context, "resolving %s: %s", 153 hostname, gai_strerror(ret)); 154 return krb5_eai_to_heim_errno(ret, save_errno); 155 } 156 157 ret = add_addrs (context, &addrs, ai); 158 freeaddrinfo (ai); 159 if (ret) 160 return ret; 161 162 kdc_flags.i = flags; 163 164 ret = krb5_get_kdc_cred (context, 165 ccache, 166 kdc_flags, 167 &addrs, 168 NULL, 169 in_creds, 170 &out_creds); 171 krb5_free_addresses (context, &addrs); 172 if (ret) { 173 return ret; 174 } 175 176 memset (&cred, 0, sizeof(cred)); 177 cred.pvno = 5; 178 cred.msg_type = krb_cred; 179 ALLOC_SEQ(&cred.tickets, 1); 180 if (cred.tickets.val == NULL) { 181 ret = ENOMEM; 182 krb5_set_error_string(context, "malloc: out of memory"); 183 goto out2; 184 } 185 ret = decode_Ticket(out_creds->ticket.data, 186 out_creds->ticket.length, 187 cred.tickets.val, &len); 188 if (ret) 189 goto out3; 190 191 memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part)); 192 ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1); 193 if (enc_krb_cred_part.ticket_info.val == NULL) { 194 ret = ENOMEM; 195 krb5_set_error_string(context, "malloc: out of memory"); 196 goto out4; 197 } 198 199 krb5_us_timeofday (context, &sec, &usec); 200 201 ALLOC(enc_krb_cred_part.timestamp, 1); 202 if (enc_krb_cred_part.timestamp == NULL) { 203 ret = ENOMEM; 204 krb5_set_error_string(context, "malloc: out of memory"); 205 goto out4; 206 } 207 *enc_krb_cred_part.timestamp = sec; 208 ALLOC(enc_krb_cred_part.usec, 1); 209 if (enc_krb_cred_part.usec == NULL) { 210 ret = ENOMEM; 211 krb5_set_error_string(context, "malloc: out of memory"); 212 goto out4; 213 } 214 *enc_krb_cred_part.usec = usec; 215 216 if (auth_context->local_address && auth_context->local_port) { 217 ret = krb5_make_addrport (context, 218 &enc_krb_cred_part.s_address, 219 auth_context->local_address, 220 auth_context->local_port); 221 if (ret) 222 goto out4; 223 } 224 225 if (auth_context->remote_address) { 226 ALLOC(enc_krb_cred_part.r_address, 1); 227 if (enc_krb_cred_part.r_address == NULL) { 228 ret = ENOMEM; 229 krb5_set_error_string(context, "malloc: out of memory"); 230 goto out4; 231 } 232 233 ret = krb5_copy_address (context, auth_context->remote_address, 234 enc_krb_cred_part.r_address); 235 if (ret) 236 goto out4; 237 } 238 239 /* fill ticket_info.val[0] */ 240 241 enc_krb_cred_part.ticket_info.len = 1; 242 243 krb_cred_info = enc_krb_cred_part.ticket_info.val; 244 245 copy_EncryptionKey (&out_creds->session, &krb_cred_info->key); 246 ALLOC(krb_cred_info->prealm, 1); 247 copy_Realm (&out_creds->client->realm, krb_cred_info->prealm); 248 ALLOC(krb_cred_info->pname, 1); 249 copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname); 250 ALLOC(krb_cred_info->flags, 1); 251 *krb_cred_info->flags = out_creds->flags.b; 252 ALLOC(krb_cred_info->authtime, 1); 253 *krb_cred_info->authtime = out_creds->times.authtime; 254 ALLOC(krb_cred_info->starttime, 1); 255 *krb_cred_info->starttime = out_creds->times.starttime; 256 ALLOC(krb_cred_info->endtime, 1); 257 *krb_cred_info->endtime = out_creds->times.endtime; 258 ALLOC(krb_cred_info->renew_till, 1); 259 *krb_cred_info->renew_till = out_creds->times.renew_till; 260 ALLOC(krb_cred_info->srealm, 1); 261 copy_Realm (&out_creds->server->realm, krb_cred_info->srealm); 262 ALLOC(krb_cred_info->sname, 1); 263 copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname); 264 ALLOC(krb_cred_info->caddr, 1); 265 copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr); 266 267 krb5_free_creds (context, out_creds); 268 269 /* encode EncKrbCredPart */ 270 271 ret = krb5_encode_EncKrbCredPart (context, 272 buf + sizeof(buf) - 1, sizeof(buf), 273 &enc_krb_cred_part, &len); 274 free_EncKrbCredPart (&enc_krb_cred_part); 275 if (ret) { 276 free_KRB_CRED(&cred); 277 return ret; 278 } 279 280 ret = krb5_crypto_init(context, auth_context->local_subkey, 0, &crypto); 281 if (ret) { 282 free_KRB_CRED(&cred); 283 return ret; 284 } 285 ret = krb5_encrypt_EncryptedData (context, 286 crypto, 287 KRB5_KU_KRB_CRED, 288 buf + sizeof(buf) - len, 289 len, 290 0, 291 &cred.enc_part); 292 krb5_crypto_destroy(context, crypto); 293 if (ret) { 294 free_KRB_CRED(&cred); 295 return ret; 296 } 297 298 ret = encode_KRB_CRED (buf + sizeof(buf) - 1, sizeof(buf), 299 &cred, &len); 300 free_KRB_CRED (&cred); 301 if (ret) 302 return ret; 303 out_data->length = len; 304 out_data->data = malloc(len); 305 if (out_data->data == NULL) { 306 krb5_set_error_string(context, "malloc: out of memory"); 307 return ENOMEM; 308 } 309 memcpy (out_data->data, buf + sizeof(buf) - len, len); 310 return 0; 311 out4: 312 free_EncKrbCredPart(&enc_krb_cred_part); 313 out3: 314 free_KRB_CRED(&cred); 315 out2: 316 krb5_free_creds (context, out_creds); 317 return ret; 318 } 319