1 /* 2 * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan 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 * See `sendauth.c' for the format. 38 */ 39 40 static krb5_boolean 41 match_exact(const void *data, const char *appl_version) 42 { 43 return strcmp(data, appl_version) == 0; 44 } 45 46 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 47 krb5_recvauth(krb5_context context, 48 krb5_auth_context *auth_context, 49 krb5_pointer p_fd, 50 const char *appl_version, 51 krb5_principal server, 52 int32_t flags, 53 krb5_keytab keytab, 54 krb5_ticket **ticket) 55 { 56 return krb5_recvauth_match_version(context, auth_context, p_fd, 57 match_exact, appl_version, 58 server, flags, 59 keytab, ticket); 60 } 61 62 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 63 krb5_recvauth_match_version(krb5_context context, 64 krb5_auth_context *auth_context, 65 krb5_pointer p_fd, 66 krb5_boolean (*match_appl_version)(const void *, 67 const char*), 68 const void *match_data, 69 krb5_principal server, 70 int32_t flags, 71 krb5_keytab keytab, 72 krb5_ticket **ticket) 73 { 74 krb5_error_code ret; 75 const char *version = KRB5_SENDAUTH_VERSION; 76 char her_version[sizeof(KRB5_SENDAUTH_VERSION)]; 77 char *her_appl_version; 78 uint32_t len, bytes; 79 u_char repl; 80 krb5_data data; 81 krb5_flags ap_options; 82 ssize_t n; 83 84 /* 85 * If there are no addresses in auth_context, get them from `fd'. 86 */ 87 88 if (*auth_context == NULL) { 89 ret = krb5_auth_con_init (context, auth_context); 90 if (ret) 91 return ret; 92 } 93 94 ret = krb5_auth_con_setaddrs_from_fd (context, 95 *auth_context, 96 p_fd); 97 if (ret) 98 return ret; 99 100 if(!(flags & KRB5_RECVAUTH_IGNORE_VERSION)) { 101 n = krb5_net_read (context, p_fd, &len, 4); 102 if (n < 0) { 103 ret = errno; 104 krb5_set_error_message(context, ret, "read: %s", strerror(ret)); 105 return ret; 106 } 107 if (n == 0) { 108 krb5_set_error_message(context, KRB5_SENDAUTH_BADAUTHVERS, 109 N_("Failed to receive sendauth data", "")); 110 return KRB5_SENDAUTH_BADAUTHVERS; 111 } 112 len = ntohl(len); 113 if (len != sizeof(her_version) 114 || krb5_net_read (context, p_fd, her_version, len) != len 115 || strncmp (version, her_version, len)) { 116 repl = 1; 117 krb5_net_write (context, p_fd, &repl, 1); 118 krb5_clear_error_message (context); 119 return KRB5_SENDAUTH_BADAUTHVERS; 120 } 121 } 122 123 n = krb5_net_read (context, p_fd, &len, 4); 124 if (n < 0) { 125 ret = errno; 126 krb5_set_error_message(context, ret, "read: %s", strerror(ret)); 127 return ret; 128 } 129 if (n == 0) { 130 krb5_clear_error_message (context); 131 return KRB5_SENDAUTH_BADAPPLVERS; 132 } 133 len = ntohl(len); 134 her_appl_version = malloc (len); 135 if (her_appl_version == NULL) { 136 repl = 2; 137 krb5_net_write (context, p_fd, &repl, 1); 138 krb5_set_error_message(context, ENOMEM, 139 N_("malloc: out of memory", "")); 140 return ENOMEM; 141 } 142 if ((bytes = krb5_net_read (context, p_fd, her_appl_version, len))) { 143 /* PR/267884: String read must always conatain a terminating NUL */ 144 if (strnlen(her_appl_version, len) == len) 145 her_appl_version[len-1] = '\0'; 146 147 if (bytes != len || 148 !(*match_appl_version)(match_data, her_appl_version)) { 149 repl = 2; 150 krb5_net_write (context, p_fd, &repl, 1); 151 krb5_set_error_message(context, KRB5_SENDAUTH_BADAPPLVERS, 152 N_("wrong sendauth version (%s)", ""), 153 her_appl_version); 154 free (her_appl_version); 155 return KRB5_SENDAUTH_BADAPPLVERS; 156 } 157 } 158 free (her_appl_version); 159 160 repl = 0; 161 if (krb5_net_write (context, p_fd, &repl, 1) != 1) { 162 ret = errno; 163 krb5_set_error_message(context, ret, "write: %s", strerror(ret)); 164 return ret; 165 } 166 167 krb5_data_zero (&data); 168 ret = krb5_read_message (context, p_fd, &data); 169 if (ret) 170 return ret; 171 172 ret = krb5_rd_req (context, 173 auth_context, 174 &data, 175 server, 176 keytab, 177 &ap_options, 178 ticket); 179 krb5_data_free (&data); 180 if (ret) { 181 krb5_data error_data; 182 krb5_error_code ret2; 183 184 ret2 = krb5_mk_error (context, 185 ret, 186 NULL, 187 NULL, 188 NULL, 189 server, 190 NULL, 191 NULL, 192 &error_data); 193 if (ret2 == 0) { 194 krb5_write_message (context, p_fd, &error_data); 195 krb5_data_free (&error_data); 196 } 197 return ret; 198 } 199 200 len = 0; 201 if (krb5_net_write (context, p_fd, &len, 4) != 4) { 202 ret = errno; 203 krb5_set_error_message(context, ret, "write: %s", strerror(ret)); 204 krb5_free_ticket(context, *ticket); 205 *ticket = NULL; 206 return ret; 207 } 208 209 if (ap_options & AP_OPTS_MUTUAL_REQUIRED) { 210 ret = krb5_mk_rep (context, *auth_context, &data); 211 if (ret) { 212 krb5_free_ticket(context, *ticket); 213 *ticket = NULL; 214 return ret; 215 } 216 217 ret = krb5_write_message (context, p_fd, &data); 218 if (ret) { 219 krb5_free_ticket(context, *ticket); 220 *ticket = NULL; 221 return ret; 222 } 223 krb5_data_free (&data); 224 } 225 return 0; 226 } 227