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 RCSID("$Id: sendauth.c 17442 2006-05-05 09:31:15Z lha $"); 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 65 krb5_error_code KRB5_LIB_FUNCTION 66 krb5_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 uint32_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 krb5_boolean my_ccache = FALSE; 90 91 len = strlen(version) + 1; 92 net_len = htonl(len); 93 if (krb5_net_write (context, p_fd, &net_len, 4) != 4 94 || krb5_net_write (context, p_fd, version, len) != len) { 95 ret = errno; 96 krb5_set_error_string (context, "write: %s", strerror(ret)); 97 return ret; 98 } 99 100 len = strlen(appl_version) + 1; 101 net_len = htonl(len); 102 if (krb5_net_write (context, p_fd, &net_len, 4) != 4 103 || krb5_net_write (context, p_fd, appl_version, len) != len) { 104 ret = errno; 105 krb5_set_error_string (context, "write: %s", strerror(ret)); 106 return ret; 107 } 108 109 sret = krb5_net_read (context, p_fd, &repl, sizeof(repl)); 110 if (sret < 0) { 111 ret = errno; 112 krb5_set_error_string (context, "read: %s", strerror(ret)); 113 return ret; 114 } else if (sret != sizeof(repl)) { 115 krb5_clear_error_string (context); 116 return KRB5_SENDAUTH_BADRESPONSE; 117 } 118 119 if (repl != 0) { 120 krb5_clear_error_string (context); 121 return KRB5_SENDAUTH_REJECTED; 122 } 123 124 if (in_creds == NULL) { 125 if (ccache == NULL) { 126 ret = krb5_cc_default (context, &ccache); 127 if (ret) 128 return ret; 129 my_ccache = TRUE; 130 } 131 132 if (client == NULL) { 133 ret = krb5_cc_get_principal (context, ccache, &this_client); 134 if (ret) { 135 if(my_ccache) 136 krb5_cc_close(context, ccache); 137 return ret; 138 } 139 client = this_client; 140 } 141 memset(&this_cred, 0, sizeof(this_cred)); 142 this_cred.client = client; 143 this_cred.server = server; 144 this_cred.times.endtime = 0; 145 this_cred.ticket.length = 0; 146 in_creds = &this_cred; 147 } 148 if (in_creds->ticket.length == 0) { 149 ret = krb5_get_credentials (context, 0, ccache, in_creds, &creds); 150 if (ret) { 151 if(my_ccache) 152 krb5_cc_close(context, ccache); 153 return ret; 154 } 155 } else { 156 creds = in_creds; 157 } 158 if(my_ccache) 159 krb5_cc_close(context, ccache); 160 ret = krb5_mk_req_extended (context, 161 auth_context, 162 ap_req_options, 163 in_data, 164 creds, 165 &ap_req); 166 167 if (out_creds) 168 *out_creds = creds; 169 else 170 krb5_free_creds(context, creds); 171 if(this_client) 172 krb5_free_principal(context, this_client); 173 174 if (ret) 175 return ret; 176 177 ret = krb5_write_message (context, 178 p_fd, 179 &ap_req); 180 if (ret) 181 return ret; 182 183 krb5_data_free (&ap_req); 184 185 ret = krb5_read_message (context, p_fd, &error_data); 186 if (ret) 187 return ret; 188 189 if (error_data.length != 0) { 190 KRB_ERROR error; 191 192 ret = krb5_rd_error (context, &error_data, &error); 193 krb5_data_free (&error_data); 194 if (ret == 0) { 195 ret = krb5_error_from_rd_error(context, &error, NULL); 196 if (ret_error != NULL) { 197 *ret_error = malloc (sizeof(krb5_error)); 198 if (*ret_error == NULL) { 199 krb5_free_error_contents (context, &error); 200 } else { 201 **ret_error = error; 202 } 203 } else { 204 krb5_free_error_contents (context, &error); 205 } 206 return ret; 207 } else { 208 krb5_clear_error_string(context); 209 return ret; 210 } 211 } 212 213 if (ap_req_options & AP_OPTS_MUTUAL_REQUIRED) { 214 krb5_data ap_rep; 215 krb5_ap_rep_enc_part *ignore; 216 217 krb5_data_zero (&ap_rep); 218 ret = krb5_read_message (context, 219 p_fd, 220 &ap_rep); 221 if (ret) 222 return ret; 223 224 ret = krb5_rd_rep (context, *auth_context, &ap_rep, 225 rep_result ? rep_result : &ignore); 226 krb5_data_free (&ap_rep); 227 if (ret) 228 return ret; 229 if (rep_result == NULL) 230 krb5_free_ap_rep_enc_part (context, ignore); 231 } 232 return 0; 233 } 234