sendauth.c revision 78527
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 36RCSID("$Id: sendauth.c,v 1.18 2001/05/14 06:14:51 assar Exp $"); 37 38/* 39 * The format seems to be: 40 * client -> server 41 * 42 * 4 bytes - length 43 * KRB5_SENDAUTH_V1.0 (including zero) 44 * 4 bytes - length 45 * protocol string (with terminating zero) 46 * 47 * server -> client 48 * 1 byte - (0 = OK, else some kind of error) 49 * 50 * client -> server 51 * 4 bytes - length 52 * AP-REQ 53 * 54 * server -> client 55 * 4 bytes - length (0 = OK, else length of error) 56 * (error) 57 * 58 * if(mutual) { 59 * server -> client 60 * 4 bytes - length 61 * AP-REP 62 * } 63 */ 64 65krb5_error_code 66krb5_sendauth(krb5_context context, 67 krb5_auth_context *auth_context, 68 krb5_pointer p_fd, 69 const char *appl_version, 70 krb5_principal client, 71 krb5_principal server, 72 krb5_flags ap_req_options, 73 krb5_data *in_data, 74 krb5_creds *in_creds, 75 krb5_ccache ccache, 76 krb5_error **ret_error, 77 krb5_ap_rep_enc_part **rep_result, 78 krb5_creds **out_creds) 79{ 80 krb5_error_code ret; 81 u_int32_t len, net_len; 82 const char *version = KRB5_SENDAUTH_VERSION; 83 u_char repl; 84 krb5_data ap_req, error_data; 85 krb5_creds this_cred; 86 krb5_principal this_client = NULL; 87 krb5_creds *creds; 88 ssize_t sret; 89 90 len = strlen(version) + 1; 91 net_len = htonl(len); 92 if (krb5_net_write (context, p_fd, &net_len, 4) != 4 93 || krb5_net_write (context, p_fd, version, len) != len) { 94 ret = errno; 95 krb5_set_error_string (context, "write: %s", strerror(ret)); 96 return ret; 97 } 98 99 len = strlen(appl_version) + 1; 100 net_len = htonl(len); 101 if (krb5_net_write (context, p_fd, &net_len, 4) != 4 102 || krb5_net_write (context, p_fd, appl_version, len) != len) { 103 ret = errno; 104 krb5_set_error_string (context, "write: %s", strerror(ret)); 105 return ret; 106 } 107 108 sret = krb5_net_read (context, p_fd, &repl, sizeof(repl)); 109 if (sret < 0) { 110 ret = errno; 111 krb5_set_error_string (context, "read: %s", strerror(ret)); 112 return ret; 113 } else if (sret != sizeof(repl)) { 114 krb5_clear_error_string (context); 115 return KRB5_SENDAUTH_BADRESPONSE; 116 } 117 118 if (repl != 0) { 119 krb5_clear_error_string (context); 120 return KRB5_SENDAUTH_REJECTED; 121 } 122 123 if (in_creds == NULL) { 124 if (ccache == NULL) { 125 ret = krb5_cc_default (context, &ccache); 126 if (ret) 127 return ret; 128 } 129 130 if (client == NULL) { 131 ret = krb5_cc_get_principal (context, ccache, &this_client); 132 if (ret) 133 return ret; 134 client = this_client; 135 } 136 memset(&this_cred, 0, sizeof(this_cred)); 137 this_cred.client = client; 138 this_cred.server = server; 139 this_cred.times.endtime = 0; 140 this_cred.ticket.length = 0; 141 in_creds = &this_cred; 142 } 143 if (in_creds->ticket.length == 0) { 144 ret = krb5_get_credentials (context, 0, ccache, in_creds, &creds); 145 if (ret) 146 return ret; 147 } else { 148 creds = in_creds; 149 } 150 ret = krb5_mk_req_extended (context, 151 auth_context, 152 ap_req_options, 153 in_data, 154 creds, 155 &ap_req); 156 157 if (out_creds) 158 *out_creds = creds; 159 else 160 krb5_free_creds(context, creds); 161 if(this_client) 162 krb5_free_principal(context, this_client); 163 164 if (ret) 165 return ret; 166 167 ret = krb5_write_message (context, 168 p_fd, 169 &ap_req); 170 if (ret) 171 return ret; 172 173 krb5_data_free (&ap_req); 174 175 ret = krb5_read_message (context, p_fd, &error_data); 176 if (ret) 177 return ret; 178 179 if (error_data.length != 0) { 180 KRB_ERROR error; 181 182 ret = krb5_rd_error (context, &error_data, &error); 183 krb5_data_free (&error_data); 184 if (ret == 0) { 185 ret = krb5_error_from_rd_error(context, &error, NULL); 186 if (ret_error != NULL) { 187 *ret_error = malloc (sizeof(krb5_error)); 188 if (*ret_error == NULL) { 189 krb5_free_error_contents (context, &error); 190 } else { 191 **ret_error = error; 192 } 193 } else { 194 krb5_free_error_contents (context, &error); 195 } 196 return ret; 197 } else { 198 krb5_clear_error_string(context); 199 return ret; 200 } 201 } 202 203 if (ap_req_options & AP_OPTS_MUTUAL_REQUIRED) { 204 krb5_data ap_rep; 205 krb5_ap_rep_enc_part *ignore; 206 207 krb5_data_zero (&ap_rep); 208 ret = krb5_read_message (context, 209 p_fd, 210 &ap_rep); 211 if (ret) 212 return ret; 213 214 ret = krb5_rd_rep (context, *auth_context, &ap_rep, 215 rep_result ? rep_result : &ignore); 216 if (ret) 217 return ret; 218 if (rep_result == NULL) 219 krb5_free_ap_rep_enc_part (context, ignore); 220 krb5_data_free (&ap_rep); 221 } 222 return 0; 223} 224