1 /* $NetBSD: tls_session.c,v 1.1.1.1 2009/06/23 10:08:57 tron Exp $ */ 2 3 /*++ 4 /* NAME 5 /* tls_session 6 /* SUMMARY 7 /* TLS client and server session routines 8 /* SYNOPSIS 9 /* #include <tls.h> 10 /* 11 /* void tls_session_stop(ctx, stream, timeout, failure, TLScontext) 12 /* TLS_APPL_STATE *ctx; 13 /* VSTREAM *stream; 14 /* int timeout; 15 /* int failure; 16 /* TLS_SESS_STATE *TLScontext; 17 /* 18 /* VSTRING *tls_session_passivate(session) 19 /* SSL_SESSION *session; 20 /* 21 /* SSL_SESSION *tls_session_activate(session_data, session_data_len) 22 /* char *session_data; 23 /* int session_data_len; 24 /* DESCRIPTION 25 /* tls_session_stop() implements the tls_server_shutdown() 26 /* and the tls_client_shutdown() routines. 27 /* 28 /* tls_session_passivate() converts an SSL_SESSION object to 29 /* VSTRING. The result is a null pointer in case of problems, 30 /* otherwise it should be disposed of with vstring_free(). 31 /* 32 /* tls_session_activate() reanimates a passivated SSL_SESSION object. 33 /* The result is a null pointer in case of problems, 34 /* otherwise it should be disposed of with SSL_SESSION_free(). 35 /* LICENSE 36 /* .ad 37 /* .fi 38 /* This software is free. You can do with it whatever you want. 39 /* The original author kindly requests that you acknowledge 40 /* the use of his software. 41 /* AUTHOR(S) 42 /* Originally written by: 43 /* Lutz Jaenicke 44 /* BTU Cottbus 45 /* Allgemeine Elektrotechnik 46 /* Universitaetsplatz 3-4 47 /* D-03044 Cottbus, Germany 48 /* 49 /* Updated by: 50 /* Wietse Venema 51 /* IBM T.J. Watson Research 52 /* P.O. Box 704 53 /* Yorktown Heights, NY 10598, USA 54 /* 55 /* Victor Duchovni 56 /* Morgan Stanley 57 /*--*/ 58 59 /* System library. */ 60 61 #include <sys_defs.h> 62 63 #ifdef USE_TLS 64 65 /* Utility library. */ 66 67 #include <vstream.h> 68 #include <msg.h> 69 #include <mymalloc.h> 70 71 /* TLS library. */ 72 73 #define TLS_INTERNAL 74 #include <tls.h> 75 76 /* Application-specific. */ 77 78 #define STR vstring_str 79 80 /* tls_session_stop - shut down the TLS connection and reset state */ 81 82 void tls_session_stop(TLS_APPL_STATE *unused_ctx, VSTREAM *stream, int timeout, 83 int failure, TLS_SESS_STATE *TLScontext) 84 { 85 const char *myname = "tls_session_stop"; 86 int retval; 87 88 /* 89 * Sanity check. 90 */ 91 if (TLScontext == 0) 92 msg_panic("%s: stream has no active TLS context", myname); 93 94 /* 95 * Perform SSL_shutdown() twice, as the first attempt will send out the 96 * shutdown alert but it will not wait for the peer's shutdown alert. 97 * Therefore, when we are the first party to send the alert, we must call 98 * SSL_shutdown() again. On failure we don't want to resume the session, 99 * so we will not perform SSL_shutdown() and the session will be removed 100 * as being bad. 101 */ 102 if (!failure) { 103 retval = tls_bio_shutdown(vstream_fileno(stream), timeout, TLScontext); 104 if (retval == 0) 105 tls_bio_shutdown(vstream_fileno(stream), timeout, TLScontext); 106 } 107 tls_free_context(TLScontext); 108 tls_stream_stop(stream); 109 } 110 111 /* tls_session_passivate - passivate SSL_SESSION object */ 112 113 VSTRING *tls_session_passivate(SSL_SESSION *session) 114 { 115 const char *myname = "tls_session_passivate"; 116 int estimate; 117 int actual_size; 118 VSTRING *session_data; 119 unsigned char *ptr; 120 121 /* 122 * First, find out how much memory is needed for the passivated 123 * SSL_SESSION object. 124 */ 125 estimate = i2d_SSL_SESSION(session, (unsigned char **) 0); 126 if (estimate <= 0) { 127 msg_warn("%s: i2d_SSL_SESSION failed: unable to cache session", myname); 128 return (0); 129 } 130 131 /* 132 * Passivate the SSL_SESSION object. The use of a VSTRING is slightly 133 * wasteful but is convenient to combine data and length. 134 */ 135 session_data = vstring_alloc(estimate); 136 ptr = (unsigned char *) STR(session_data); 137 actual_size = i2d_SSL_SESSION(session, &ptr); 138 if (actual_size != estimate) { 139 msg_warn("%s: i2d_SSL_SESSION failed: unable to cache session", myname); 140 vstring_free(session_data); 141 return (0); 142 } 143 VSTRING_AT_OFFSET(session_data, actual_size); /* XXX not public */ 144 145 return (session_data); 146 } 147 148 /* tls_session_activate - activate passivated session */ 149 150 SSL_SESSION *tls_session_activate(const char *session_data, int session_data_len) 151 { 152 #if (OPENSSL_VERSION_NUMBER < 0x0090707fL) 153 #define BOGUS_CONST 154 #else 155 #define BOGUS_CONST const 156 #endif 157 SSL_SESSION *session; 158 BOGUS_CONST unsigned char *ptr; 159 160 /* 161 * Activate the SSL_SESSION object. 162 */ 163 ptr = (BOGUS_CONST unsigned char *) session_data; 164 session = d2i_SSL_SESSION((SSL_SESSION **) 0, &ptr, session_data_len); 165 if (!session) 166 tls_print_errors(); 167 168 return (session); 169 } 170 171 #endif 172