1 /* 2 * Copyright (c) 1997-2007 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: recvauth.c 20306 2007-04-11 11:15:55Z lha $"); 37 38 /* 39 * See `sendauth.c' for the format. 40 */ 41 42 static krb5_boolean 43 match_exact(const void *data, const char *appl_version) 44 { 45 return strcmp(data, appl_version) == 0; 46 } 47 48 krb5_error_code KRB5_LIB_FUNCTION 49 krb5_recvauth(krb5_context context, 50 krb5_auth_context *auth_context, 51 krb5_pointer p_fd, 52 const char *appl_version, 53 krb5_principal server, 54 int32_t flags, 55 krb5_keytab keytab, 56 krb5_ticket **ticket) 57 { 58 return krb5_recvauth_match_version(context, auth_context, p_fd, 59 match_exact, appl_version, 60 server, flags, 61 keytab, ticket); 62 } 63 64 krb5_error_code KRB5_LIB_FUNCTION 65 krb5_recvauth_match_version(krb5_context context, 66 krb5_auth_context *auth_context, 67 krb5_pointer p_fd, 68 krb5_boolean (*match_appl_version)(const void *, 69 const char*), 70 const void *match_data, 71 krb5_principal server, 72 int32_t flags, 73 krb5_keytab keytab, 74 krb5_ticket **ticket) 75 { 76 krb5_error_code ret; 77 const char *version = KRB5_SENDAUTH_VERSION; 78 char her_version[sizeof(KRB5_SENDAUTH_VERSION)]; 79 char *her_appl_version; 80 uint32_t len; 81 u_char repl; 82 krb5_data data; 83 krb5_flags ap_options; 84 ssize_t n; 85 86 /* 87 * If there are no addresses in auth_context, get them from `fd'. 88 */ 89 90 if (*auth_context == NULL) { 91 ret = krb5_auth_con_init (context, auth_context); 92 if (ret) 93 return ret; 94 } 95 96 ret = krb5_auth_con_setaddrs_from_fd (context, 97 *auth_context, 98 p_fd); 99 if (ret) 100 return ret; 101 102 if(!(flags & KRB5_RECVAUTH_IGNORE_VERSION)) { 103 n = krb5_net_read (context, p_fd, &len, 4); 104 if (n < 0) { 105 ret = errno; 106 krb5_set_error_string (context, "read: %s", strerror(errno)); 107 return ret; 108 } 109 if (n == 0) { 110 krb5_set_error_string (context, "Failed to receive sendauth data"); 111 return KRB5_SENDAUTH_BADAUTHVERS; 112 } 113 len = ntohl(len); 114 if (len != sizeof(her_version) 115 || krb5_net_read (context, p_fd, her_version, len) != len 116 || strncmp (version, her_version, len)) { 117 repl = 1; 118 krb5_net_write (context, p_fd, &repl, 1); 119 krb5_clear_error_string (context); 120 return KRB5_SENDAUTH_BADAUTHVERS; 121 } 122 } 123 124 n = krb5_net_read (context, p_fd, &len, 4); 125 if (n < 0) { 126 ret = errno; 127 krb5_set_error_string (context, "read: %s", strerror(errno)); 128 return ret; 129 } 130 if (n == 0) { 131 krb5_clear_error_string (context); 132 return KRB5_SENDAUTH_BADAPPLVERS; 133 } 134 len = ntohl(len); 135 her_appl_version = malloc (len); 136 if (her_appl_version == NULL) { 137 repl = 2; 138 krb5_net_write (context, p_fd, &repl, 1); 139 krb5_set_error_string (context, "malloc: out of memory"); 140 return ENOMEM; 141 } 142 if (krb5_net_read (context, p_fd, her_appl_version, len) != len 143 || !(*match_appl_version)(match_data, her_appl_version)) { 144 repl = 2; 145 krb5_net_write (context, p_fd, &repl, 1); 146 krb5_set_error_string (context, "wrong sendauth version (%s)", 147 her_appl_version); 148 free (her_appl_version); 149 return KRB5_SENDAUTH_BADAPPLVERS; 150 } 151 free (her_appl_version); 152 153 repl = 0; 154 if (krb5_net_write (context, p_fd, &repl, 1) != 1) { 155 ret = errno; 156 krb5_set_error_string (context, "write: %s", strerror(errno)); 157 return ret; 158 } 159 160 krb5_data_zero (&data); 161 ret = krb5_read_message (context, p_fd, &data); 162 if (ret) 163 return ret; 164 165 ret = krb5_rd_req (context, 166 auth_context, 167 &data, 168 server, 169 keytab, 170 &ap_options, 171 ticket); 172 krb5_data_free (&data); 173 if (ret) { 174 krb5_data error_data; 175 krb5_error_code ret2; 176 177 ret2 = krb5_mk_error (context, 178 ret, 179 NULL, 180 NULL, 181 NULL, 182 server, 183 NULL, 184 NULL, 185 &error_data); 186 if (ret2 == 0) { 187 krb5_write_message (context, p_fd, &error_data); 188 krb5_data_free (&error_data); 189 } 190 return ret; 191 } 192 193 len = 0; 194 if (krb5_net_write (context, p_fd, &len, 4) != 4) { 195 ret = errno; 196 krb5_set_error_string (context, "write: %s", strerror(errno)); 197 return ret; 198 } 199 200 if (ap_options & AP_OPTS_MUTUAL_REQUIRED) { 201 ret = krb5_mk_rep (context, *auth_context, &data); 202 if (ret) 203 return ret; 204 205 ret = krb5_write_message (context, p_fd, &data); 206 if (ret) 207 return ret; 208 krb5_data_free (&data); 209 } 210 return 0; 211 } 212