sendauth.c revision 233294
1/* 2 * Copyright (c) 1997 - 2006 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/* 37 * The format seems to be: 38 * client -> server 39 * 40 * 4 bytes - length 41 * KRB5_SENDAUTH_V1.0 (including zero) 42 * 4 bytes - length 43 * protocol string (with terminating zero) 44 * 45 * server -> client 46 * 1 byte - (0 = OK, else some kind of error) 47 * 48 * client -> server 49 * 4 bytes - length 50 * AP-REQ 51 * 52 * server -> client 53 * 4 bytes - length (0 = OK, else length of error) 54 * (error) 55 * 56 * if(mutual) { 57 * server -> client 58 * 4 bytes - length 59 * AP-REP 60 * } 61 */ 62 63KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 64krb5_sendauth(krb5_context context, 65 krb5_auth_context *auth_context, 66 krb5_pointer p_fd, 67 const char *appl_version, 68 krb5_principal client, 69 krb5_principal server, 70 krb5_flags ap_req_options, 71 krb5_data *in_data, 72 krb5_creds *in_creds, 73 krb5_ccache ccache, 74 krb5_error **ret_error, 75 krb5_ap_rep_enc_part **rep_result, 76 krb5_creds **out_creds) 77{ 78 krb5_error_code ret; 79 uint32_t len, net_len; 80 const char *version = KRB5_SENDAUTH_VERSION; 81 u_char repl; 82 krb5_data ap_req, error_data; 83 krb5_creds this_cred; 84 krb5_principal this_client = NULL; 85 krb5_creds *creds; 86 ssize_t sret; 87 krb5_boolean my_ccache = FALSE; 88 89 len = strlen(version) + 1; 90 net_len = htonl(len); 91 if (krb5_net_write (context, p_fd, &net_len, 4) != 4 92 || krb5_net_write (context, p_fd, version, len) != len) { 93 ret = errno; 94 krb5_set_error_message (context, ret, "write: %s", strerror(ret)); 95 return ret; 96 } 97 98 len = strlen(appl_version) + 1; 99 net_len = htonl(len); 100 if (krb5_net_write (context, p_fd, &net_len, 4) != 4 101 || krb5_net_write (context, p_fd, appl_version, len) != len) { 102 ret = errno; 103 krb5_set_error_message (context, ret, "write: %s", strerror(ret)); 104 return ret; 105 } 106 107 sret = krb5_net_read (context, p_fd, &repl, sizeof(repl)); 108 if (sret < 0) { 109 ret = errno; 110 krb5_set_error_message (context, ret, "read: %s", strerror(ret)); 111 return ret; 112 } else if (sret != sizeof(repl)) { 113 krb5_clear_error_message (context); 114 return KRB5_SENDAUTH_BADRESPONSE; 115 } 116 117 if (repl != 0) { 118 krb5_clear_error_message (context); 119 return KRB5_SENDAUTH_REJECTED; 120 } 121 122 if (in_creds == NULL) { 123 if (ccache == NULL) { 124 ret = krb5_cc_default (context, &ccache); 125 if (ret) 126 return ret; 127 my_ccache = TRUE; 128 } 129 130 if (client == NULL) { 131 ret = krb5_cc_get_principal (context, ccache, &this_client); 132 if (ret) { 133 if(my_ccache) 134 krb5_cc_close(context, ccache); 135 return ret; 136 } 137 client = this_client; 138 } 139 memset(&this_cred, 0, sizeof(this_cred)); 140 this_cred.client = client; 141 this_cred.server = server; 142 this_cred.times.endtime = 0; 143 this_cred.ticket.length = 0; 144 in_creds = &this_cred; 145 } 146 if (in_creds->ticket.length == 0) { 147 ret = krb5_get_credentials (context, 0, ccache, in_creds, &creds); 148 if (ret) { 149 if(my_ccache) 150 krb5_cc_close(context, ccache); 151 return ret; 152 } 153 } else { 154 creds = in_creds; 155 } 156 if(my_ccache) 157 krb5_cc_close(context, ccache); 158 ret = krb5_mk_req_extended (context, 159 auth_context, 160 ap_req_options, 161 in_data, 162 creds, 163 &ap_req); 164 165 if (out_creds) 166 *out_creds = creds; 167 else 168 krb5_free_creds(context, creds); 169 if(this_client) 170 krb5_free_principal(context, this_client); 171 172 if (ret) 173 return ret; 174 175 ret = krb5_write_message (context, 176 p_fd, 177 &ap_req); 178 if (ret) 179 return ret; 180 181 krb5_data_free (&ap_req); 182 183 ret = krb5_read_message (context, p_fd, &error_data); 184 if (ret) 185 return ret; 186 187 if (error_data.length != 0) { 188 KRB_ERROR error; 189 190 ret = krb5_rd_error (context, &error_data, &error); 191 krb5_data_free (&error_data); 192 if (ret == 0) { 193 ret = krb5_error_from_rd_error(context, &error, NULL); 194 if (ret_error != NULL) { 195 *ret_error = malloc (sizeof(krb5_error)); 196 if (*ret_error == NULL) { 197 krb5_free_error_contents (context, &error); 198 } else { 199 **ret_error = error; 200 } 201 } else { 202 krb5_free_error_contents (context, &error); 203 } 204 return ret; 205 } else { 206 krb5_clear_error_message(context); 207 return ret; 208 } 209 } else 210 krb5_data_free (&error_data); 211 212 if (ap_req_options & AP_OPTS_MUTUAL_REQUIRED) { 213 krb5_data ap_rep; 214 krb5_ap_rep_enc_part *ignore = NULL; 215 216 krb5_data_zero (&ap_rep); 217 ret = krb5_read_message (context, 218 p_fd, 219 &ap_rep); 220 if (ret) 221 return ret; 222 223 ret = krb5_rd_rep (context, *auth_context, &ap_rep, 224 rep_result ? rep_result : &ignore); 225 krb5_data_free (&ap_rep); 226 if (ret) 227 return ret; 228 if (rep_result == NULL) 229 krb5_free_ap_rep_enc_part (context, ignore); 230 } 231 return 0; 232} 233