1 /* serv.cpp - Minimal ssleay server for Unix 2 30.9.1996, Sampo Kellomaki <sampo@iki.fi> */ 3 4 5 /* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b 6 Simplified to be even more minimal 7 12/98 - 4/99 Wade Scholine <wades@mail.cybg.com> */ 8 9 #include <stdio.h> 10 #include <unistd.h> 11 #include <stdlib.h> 12 #include <memory.h> 13 #include <errno.h> 14 #include <sys/types.h> 15 #include <sys/socket.h> 16 #include <netinet/in.h> 17 #include <arpa/inet.h> 18 #include <netdb.h> 19 20 #include <openssl/rsa.h> /* SSLeay stuff */ 21 #include <openssl/crypto.h> 22 #include <openssl/x509.h> 23 #include <openssl/pem.h> 24 #include <openssl/ssl.h> 25 #include <openssl/err.h> 26 27 28 /* define HOME to be dir for key and cert files... */ 29 #define HOME "./" 30 /* Make these what you want for cert & key files */ 31 #define CERTF HOME "foo-cert.pem" 32 #define KEYF HOME "foo-cert.pem" 33 34 35 #define CHK_NULL(x) if ((x)==NULL) exit (1) 36 #define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); } 37 #define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); } 38 main()39 void main () 40 { 41 int err; 42 int listen_sd; 43 int sd; 44 struct sockaddr_in sa_serv; 45 struct sockaddr_in sa_cli; 46 size_t client_len; 47 SSL_CTX* ctx; 48 SSL* ssl; 49 X509* client_cert; 50 char* str; 51 char buf [4096]; 52 SSL_METHOD *meth; 53 54 /* SSL preliminaries. We keep the certificate and key with the context. */ 55 56 SSL_load_error_strings(); 57 SSLeay_add_ssl_algorithms(); 58 meth = SSLv23_server_method(); 59 ctx = SSL_CTX_new (meth); 60 if (!ctx) { 61 ERR_print_errors_fp(stderr); 62 exit(2); 63 } 64 65 if (SSL_CTX_use_certificate_file(ctx, CERTF, SSL_FILETYPE_PEM) <= 0) { 66 ERR_print_errors_fp(stderr); 67 exit(3); 68 } 69 if (SSL_CTX_use_PrivateKey_file(ctx, KEYF, SSL_FILETYPE_PEM) <= 0) { 70 ERR_print_errors_fp(stderr); 71 exit(4); 72 } 73 74 if (!SSL_CTX_check_private_key(ctx)) { 75 fprintf(stderr,"Private key does not match the certificate public key\n"); 76 exit(5); 77 } 78 79 /* ----------------------------------------------- */ 80 /* Prepare TCP socket for receiving connections */ 81 82 listen_sd = socket (AF_INET, SOCK_STREAM, 0); CHK_ERR(listen_sd, "socket"); 83 84 memset (&sa_serv, '\0', sizeof(sa_serv)); 85 sa_serv.sin_family = AF_INET; 86 sa_serv.sin_addr.s_addr = INADDR_ANY; 87 sa_serv.sin_port = htons (1111); /* Server Port number */ 88 89 err = bind(listen_sd, (struct sockaddr*) &sa_serv, 90 sizeof (sa_serv)); CHK_ERR(err, "bind"); 91 92 /* Receive a TCP connection. */ 93 94 err = listen (listen_sd, 5); CHK_ERR(err, "listen"); 95 96 client_len = sizeof(sa_cli); 97 sd = accept (listen_sd, (struct sockaddr*) &sa_cli, &client_len); 98 CHK_ERR(sd, "accept"); 99 close (listen_sd); 100 101 printf ("Connection from %lx, port %x\n", 102 sa_cli.sin_addr.s_addr, sa_cli.sin_port); 103 104 /* ----------------------------------------------- */ 105 /* TCP connection is ready. Do server side SSL. */ 106 107 ssl = SSL_new (ctx); CHK_NULL(ssl); 108 SSL_set_fd (ssl, sd); 109 err = SSL_accept (ssl); CHK_SSL(err); 110 111 /* Get the cipher - opt */ 112 113 printf ("SSL connection using %s\n", SSL_get_cipher (ssl)); 114 115 /* Get client's certificate (note: beware of dynamic allocation) - opt */ 116 117 client_cert = SSL_get_peer_certificate (ssl); 118 if (client_cert != NULL) { 119 printf ("Client certificate:\n"); 120 121 str = X509_NAME_oneline (X509_get_subject_name (client_cert), 0, 0); 122 CHK_NULL(str); 123 printf ("\t subject: %s\n", str); 124 OPENSSL_free (str); 125 126 str = X509_NAME_oneline (X509_get_issuer_name (client_cert), 0, 0); 127 CHK_NULL(str); 128 printf ("\t issuer: %s\n", str); 129 OPENSSL_free (str); 130 131 /* We could do all sorts of certificate verification stuff here before 132 deallocating the certificate. */ 133 134 X509_free (client_cert); 135 } else 136 printf ("Client does not have certificate.\n"); 137 138 /* DATA EXCHANGE - Receive message and send reply. */ 139 140 err = SSL_read (ssl, buf, sizeof(buf) - 1); CHK_SSL(err); 141 buf[err] = '\0'; 142 printf ("Got %d chars:'%s'\n", err, buf); 143 144 err = SSL_write (ssl, "I hear you.", strlen("I hear you.")); CHK_SSL(err); 145 146 /* Clean up. */ 147 148 close (sd); 149 SSL_free (ssl); 150 SSL_CTX_free (ctx); 151 } 152 /* EOF - serv.cpp */ 153