/* * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "krb5_locl.h" /* * See `sendauth.c' for the format. */ static krb5_boolean match_exact(const void *data, const char *appl_version) { return strcmp(data, appl_version) == 0; } KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_recvauth(krb5_context context, krb5_auth_context *auth_context, krb5_pointer p_fd, const char *appl_version, krb5_principal server, int32_t flags, krb5_keytab keytab, krb5_ticket **ticket) { return krb5_recvauth_match_version(context, auth_context, p_fd, match_exact, appl_version, server, flags, keytab, ticket); } KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_recvauth_match_version(krb5_context context, krb5_auth_context *auth_context, krb5_pointer p_fd, krb5_boolean (*match_appl_version)(const void *, const char*), const void *match_data, krb5_principal server, int32_t flags, krb5_keytab keytab, krb5_ticket **ticket) { krb5_error_code ret; const char *version = KRB5_SENDAUTH_VERSION; char her_version[sizeof(KRB5_SENDAUTH_VERSION)]; char *her_appl_version; uint32_t len, bytes; u_char repl; krb5_data data; krb5_flags ap_options; ssize_t n; /* * If there are no addresses in auth_context, get them from `fd'. */ if (*auth_context == NULL) { ret = krb5_auth_con_init (context, auth_context); if (ret) return ret; } ret = krb5_auth_con_setaddrs_from_fd (context, *auth_context, p_fd); if (ret) return ret; if(!(flags & KRB5_RECVAUTH_IGNORE_VERSION)) { n = krb5_net_read (context, p_fd, &len, 4); if (n < 0) { ret = errno; krb5_set_error_message(context, ret, "read: %s", strerror(ret)); return ret; } if (n == 0) { krb5_set_error_message(context, KRB5_SENDAUTH_BADAUTHVERS, N_("Failed to receive sendauth data", "")); return KRB5_SENDAUTH_BADAUTHVERS; } len = ntohl(len); if (len != sizeof(her_version) || krb5_net_read (context, p_fd, her_version, len) != len || strncmp (version, her_version, len)) { repl = 1; krb5_net_write (context, p_fd, &repl, 1); krb5_clear_error_message (context); return KRB5_SENDAUTH_BADAUTHVERS; } } n = krb5_net_read (context, p_fd, &len, 4); if (n < 0) { ret = errno; krb5_set_error_message(context, ret, "read: %s", strerror(ret)); return ret; } if (n == 0) { krb5_clear_error_message (context); return KRB5_SENDAUTH_BADAPPLVERS; } len = ntohl(len); her_appl_version = malloc (len); if (her_appl_version == NULL) { repl = 2; krb5_net_write (context, p_fd, &repl, 1); krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", "")); return ENOMEM; } if ((bytes = krb5_net_read (context, p_fd, her_appl_version, len))) { /* PR/267884: String read must always conatain a terminating NUL */ if (strnlen(her_appl_version, len) == len) her_appl_version[len-1] = '\0'; if (bytes != len || !(*match_appl_version)(match_data, her_appl_version)) { repl = 2; krb5_net_write (context, p_fd, &repl, 1); krb5_set_error_message(context, KRB5_SENDAUTH_BADAPPLVERS, N_("wrong sendauth version (%s)", ""), her_appl_version); free (her_appl_version); return KRB5_SENDAUTH_BADAPPLVERS; } } free (her_appl_version); repl = 0; if (krb5_net_write (context, p_fd, &repl, 1) != 1) { ret = errno; krb5_set_error_message(context, ret, "write: %s", strerror(ret)); return ret; } krb5_data_zero (&data); ret = krb5_read_message (context, p_fd, &data); if (ret) return ret; ret = krb5_rd_req (context, auth_context, &data, server, keytab, &ap_options, ticket); krb5_data_free (&data); if (ret) { krb5_data error_data; krb5_error_code ret2; ret2 = krb5_mk_error (context, ret, NULL, NULL, NULL, server, NULL, NULL, &error_data); if (ret2 == 0) { krb5_write_message (context, p_fd, &error_data); krb5_data_free (&error_data); } return ret; } len = 0; if (krb5_net_write (context, p_fd, &len, 4) != 4) { ret = errno; krb5_set_error_message(context, ret, "write: %s", strerror(ret)); krb5_free_ticket(context, *ticket); *ticket = NULL; return ret; } if (ap_options & AP_OPTS_MUTUAL_REQUIRED) { ret = krb5_mk_rep (context, *auth_context, &data); if (ret) { krb5_free_ticket(context, *ticket); *ticket = NULL; return ret; } ret = krb5_write_message (context, p_fd, &data); if (ret) { krb5_free_ticket(context, *ticket); *ticket = NULL; return ret; } krb5_data_free (&data); } return 0; }