使用ssl c / c ++进行客户端和服务器通信 – SSL协议不起作用

我正在尝试使用以下软件中的SSL客户端/服务器示例： http ： //simplestcodings.blogspot.com.br/2010/08/secure-server-client-using-openssl-in-c.html以使用以下方法创建安全连接SSLv3的。 我在服务器端请求证书进行了一些更改，通信工作正常并且双方都理解。 因此，我的问题是当客户端连接到服务器时，协议通信SSLv3无法正常工作，我使用wirkeshark进行validation，并且在协议字段中只显示TCP或IPA（RSL格式错误的数据包）有人可以帮助我吗？ 谢谢！

我按照教程https://help.ubuntu.com/community/OpenSSL创建了我的证书。

这是我的客户端代码：

//SSL-Client.c #include  #include  #include  #include  #include  #include  #include  #include  #include  #include  #define FAIL -1 //Added the LoadCertificates how in the server-side makes. void LoadCertificates(SSL_CTX* ctx, char* CertFile, char* KeyFile) { /* set the local certificate from CertFile */ if ( SSL_CTX_use_certificate_file(ctx, CertFile, SSL_FILETYPE_PEM) <= 0 ) { ERR_print_errors_fp(stderr); abort(); } /* set the private key from KeyFile (may be the same as CertFile) */ if ( SSL_CTX_use_PrivateKey_file(ctx, KeyFile, SSL_FILETYPE_PEM) h_addr); if ( connect(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0 ) { close(sd); perror(hostname); abort(); } return sd; } SSL_CTX* InitCTX(void) { SSL_METHOD *method; SSL_CTX *ctx; OpenSSL_add_all_algorithms(); /* Load cryptos, et.al. */ SSL_load_error_strings(); /* Bring in and register error messages */ method = SSLv3_client_method(); /* Create new client-method instance */ ctx = SSL_CTX_new(method); /* Create new context */ if ( ctx == NULL ) { ERR_print_errors_fp(stderr); abort(); } return ctx; } void ShowCerts(SSL* ssl) { X509 *cert; char *line; cert = SSL_get_peer_certificate(ssl); /* get the server's certificate */ if ( cert != NULL ) { printf("Server certificates:\n"); line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0); printf("Subject: %s\n", line); free(line); /* free the malloc'ed string */ line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0); printf("Issuer: %s\n", line); free(line); /* free the malloc'ed string */ X509_free(cert); /* free the malloc'ed certificate copy */ } else printf("No certificates.\n"); } int main() { SSL_CTX *ctx; int server; SSL *ssl; char buf[1024]; int bytes; char hostname[]="127.0.0.1"; char portnum[]="5000"; char CertFile[] = "/home/myCA/cacert.pem"; char KeyFile[] = "/home/myCA/private/cakey.pem"; SSL_library_init(); ctx = InitCTX(); LoadCertificates(ctx, CertFile, KeyFile); server = OpenConnection(hostname, atoi(portnum)); ssl = SSL_new(ctx); /* create new SSL connection state */ SSL_set_fd(ssl, server); /* attach the socket descriptor */ if ( SSL_connect(ssl) == FAIL ) /* perform the connection */ ERR_print_errors_fp(stderr); else { char *msg = "Hello???"; printf("Connected with %s encryption\n", SSL_get_cipher(ssl)); ShowCerts(ssl); /* get any certs */ SSL_write(ssl, msg, strlen(msg)); /* encrypt & send message */ bytes = SSL_read(ssl, buf, sizeof(buf)); /* get reply & decrypt */ buf[bytes] = 0; printf("Received: \"%s\"\n", buf); SSL_free(ssl); /* release connection state */ } close(server); /* close socket */ SSL_CTX_free(ctx); /* release context */ return 0; } 

和服务器：

 //SSL-Server.c #include  #include  #include  #include  #include  #include  #include  #include  #include  #include "openssl/ssl.h" #include "openssl/err.h" #define FAIL -1 int OpenListener(int port) { int sd; struct sockaddr_in addr; sd = socket(PF_INET, SOCK_STREAM, 0); bzero(&addr, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(port); addr.sin_addr.s_addr = INADDR_ANY; if ( bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0 ) { perror("can't bind port"); abort(); } if ( listen(sd, 10) != 0 ) { perror("Can't configure listening port"); abort(); } return sd; } SSL_CTX* InitServerCTX(void) { SSL_METHOD *method; SSL_CTX *ctx; OpenSSL_add_all_algorithms(); /* load & register all cryptos, etc. */ SSL_load_error_strings(); /* load all error messages */ method = SSLv3_server_method(); /* create new server-method instance */ ctx = SSL_CTX_new(method); /* create new context from method */ if ( ctx == NULL ) { ERR_print_errors_fp(stderr); abort(); } return ctx; } void LoadCertificates(SSL_CTX* ctx, char* CertFile, char* KeyFile) { //New lines if (SSL_CTX_load_verify_locations(ctx, CertFile, KeyFile) != 1) ERR_print_errors_fp(stderr); if (SSL_CTX_set_default_verify_paths(ctx) != 1) ERR_print_errors_fp(stderr); //End new lines /* set the local certificate from CertFile */ if (SSL_CTX_use_certificate_file(ctx, CertFile, SSL_FILETYPE_PEM) <= 0) { ERR_print_errors_fp(stderr); abort(); } /* set the private key from KeyFile (may be the same as CertFile) */ if (SSL_CTX_use_PrivateKey_file(ctx, KeyFile, SSL_FILETYPE_PEM) <= 0) { ERR_print_errors_fp(stderr); abort(); } /* verify private key */ if (!SSL_CTX_check_private_key(ctx)) { fprintf(stderr, "Private key does not match the public certificate\n"); abort(); } //New lines - Force the client-side have a certificate SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, NULL); SSL_CTX_set_verify_depth(ctx, 4); //End new lines } void ShowCerts(SSL* ssl) { X509 *cert; char *line; cert = SSL_get_peer_certificate(ssl); /* Get certificates (if available) */ if ( cert != NULL ) { printf("Server certificates:\n"); line = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0); printf("Subject: %s\n", line); free(line); line = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0); printf("Issuer: %s\n", line); free(line); X509_free(cert); } else printf("No certificates.\n"); } void Servlet(SSL* ssl) /* Serve the connection -- threadable */ { char buf[1024]; char reply[1024]; int sd, bytes; const char* HTMLecho="
%s
\n\n"; if ( SSL_accept(ssl) == FAIL ) /* do SSL-protocol accept */ ERR_print_errors_fp(stderr); else { ShowCerts(ssl); /* get any certificates */ bytes = SSL_read(ssl, buf, sizeof(buf)); /* get request */ if ( bytes > 0 ) { buf[bytes] = 0; printf("Client msg: \"%s\"\n", buf); sprintf(reply, HTMLecho, buf); /* construct reply */ SSL_write(ssl, reply, strlen(reply)); /* send reply */ } else ERR_print_errors_fp(stderr); } sd = SSL_get_fd(ssl); /* get socket connection */ SSL_free(ssl); /* release SSL state */ close(sd); /* close connection */ } int main() { SSL_CTX *ctx; int server; char portnum[]="5000"; char CertFile[] = "/home/myCA/mycert.pem"; char KeyFile[] = "/home/myCA/mycert.pem"; SSL_library_init(); ctx = InitServerCTX(); /* initialize SSL */ LoadCertificates(ctx, CertFile, KeyFile); /* load certs */ server = OpenListener(atoi(portnum)); /* create server socket */ while (1) { struct sockaddr_in addr; socklen_t len = sizeof(addr); SSL *ssl; int client = accept(server, (struct sockaddr*)&addr, &len); /* accept connection as usual */ printf("Connection: %s:%d\n",inet_ntoa(addr.sin_addr), ntohs(addr.sin_port)); ssl = SSL_new(ctx); /* get new SSL state with context */ SSL_set_fd(ssl, client); /* set connection socket to SSL state */ Servlet(ssl); /* service connection */ } close(server); /* close server socket */ SSL_CTX_free(ctx); /* release context */ } 


	







 
	
Answer 1
		      	
 使用上面的服务器和客户端程序，我收到以下错误： 
  140671281543104：错误：140890B2：SSL例程：SSL3_GET_CLIENT_CERTIFICATE：未返回证书：s3_srvr.c：3292： 
 我使用https://help.ubuntu.com/community/OpenSSL中提到的过程生成了自签名证书。 
 在error handling了一天之后，我发现错误是因为自生成的CA不在我正在使用的机器的信任链中。 
 要将CA添加到RHEL-7中的信任链，可以按照以下过程操作： 
  To add a certificate in the simple PEM or DER file formats to the list of CAs trusted on the system: Copy it to the /etc/pki/ca-trust/source/anchors/ subdirectory, and run the update-ca-trust command. If your certificate is in the extended BEGIN TRUSTED file format, then place it into the main source/ directory instead. 
 我认为Fedora也可以遵循上述程序。 如果这不起作用，那么探索诸如“update-ca-certificates”之类的命令可能会有用。 希望这对某人有用。 


Answer 2
		      	
 你必须修改你的代码（服务器端）：你的代码： 
 int main() { SSL_CTX *ctx; int server; **char portnum[]="5000";** char CertFile[] = "/home/myCA/mycert.pem"; char KeyFile[] = "/home/myCA/mycert.pem"; SSL_library_init(); **portnum = strings[1];** 
 相反，你应该使用这个： 
 int main(int argc, char **argv) { SSL_CTX *ctx; int server; //char portnum[]="5000"; ---> You can pass it as an argument char CertFile[] = "/home/myCA/mycert.pem"; char KeyFile[] = "/home/myCA/mycert.pem"; SSL_library_init(); //portnum = strings[1]; portnum = argv[1]; // ---> You can pass port number here, instead of put it in the code 
 我得到了这个输出（客户端）： 
 toc@UnixServer:~$ ./ssl_client Connected with AES256-SHA encryption Server certificates: Subject: /C=FR/ST=Some-State/L=PARIS/O=TOC/OU=TOC/CN=TOC/emailAddress=[e-mail] Issuer: /C=FR/ST=Some-State/L=PARIS/O=TOC/OU=TOC/CN=TOC/emailAddress=[e-mail] Received: "
Hello???
 " 
 而这个输出（服务器）： 
 Connection: 127.0.0.1:59066 Server certificates: Subject: /C=FR/ST=Some-State/L=PARIS/O=TOC/OU=TOC/CN=TOC/emailAddress=[e-mail] Issuer: /C=FR/ST=Some-State/L=PARIS/O=TOC/OU=TOC/CN=TOC/emailAddress=[e-mail] Client msg: "Hello???" 
 当您使用ssldump（http://www.rtfm.com/ssldump/）等工具（在unix框中）时，您可以清楚地看到发生了什么： 
 toc@UnixServer:~$sudo ssldump -i lo port 5000 New TCP connection #1: localhost(59071) <-> localhost(5000) 1 1 0.0012 (0.0012) C>S Handshake ClientHello Version 3.0 cipher suites Unknown value 0xc014 Unknown value 0xc00a SSL_DHE_RSA_WITH_AES_256_CBC_SHA SSL_DHE_DSS_WITH_AES_256_CBC_SHA Unknown value 0x88 Unknown value 0x87 Unknown value 0xc00f Unknown value 0xc005 SSL_RSA_WITH_AES_256_CBC_SHA Unknown value 0x84 Unknown value 0xc012 Unknown value 0xc008 SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA Unknown value 0xc00d Unknown value 0xc003 SSL_RSA_WITH_3DES_EDE_CBC_SHA Unknown value 0xc013 Unknown value 0xc009 SSL_DHE_RSA_WITH_AES_128_CBC_SHA SSL_DHE_DSS_WITH_AES_128_CBC_SHA Unknown value 0x9a Unknown value 0x99 Unknown value 0x45 Unknown value 0x44 Unknown value 0xc00e Unknown value 0xc004 SSL_RSA_WITH_AES_128_CBC_SHA Unknown value 0x96 Unknown value 0x41 Unknown value 0xc011 Unknown value 0xc007 Unknown value 0xc00c Unknown value 0xc002 SSL_RSA_WITH_RC4_128_SHA SSL_RSA_WITH_RC4_128_MD5 SSL_DHE_RSA_WITH_DES_CBC_SHA SSL_DHE_DSS_WITH_DES_CBC_SHA SSL_RSA_WITH_DES_CBC_SHA SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA SSL_RSA_EXPORT_WITH_DES40_CBC_SHA SSL_RSA_EXPORT_WITH_RC2_CBC_40_MD5 SSL_RSA_EXPORT_WITH_RC4_40_MD5 Unknown value 0xff compression methods unknown value NULL 1 2 0.0019 (0.0006) S>C Handshake ServerHello Version 3.0 session_id[32]= 13 e2 5a f0 10 93 18 56 c8 66 54 94 29 ab 8b 2d 7b c6 9c 3b 7b ea c7 54 e6 86 7d 3a 56 8c 96 14 cipherSuite SSL_RSA_WITH_AES_256_CBC_SHA compressionMethod unknown value 1 3 0.0019 (0.0000) S>C Handshake Certificate 1 4 0.0019 (0.0000) S>C Handshake CertificateRequest certificate_types rsa_sign certificate_types dss_sign ServerHelloDone 1 5 0.0155 (0.0136) C>S Handshake Certificate 1 6 0.0155 (0.0000) C>S Handshake ClientKeyExchange 1 7 0.0155 (0.0000) C>S Handshake CertificateVerify Signature[128]= ac 94 31 89 64 75 20 5f 4f 00 73 4e e8 de 51 b7 f1 bb 16 da 63 b1 8d e9 15 9b af f8 32 d7 84 f5 b5 7d 4f 48 1c 2b 41 58 81 d3 a8 50 40 25 90 95 44 de 9d bb c4 79 5c 64 a8 a9 28 f4 16 7c 0e 17 b2 77 cf b0 8c a9 90 50 34 a5 76 a2 57 39 8d 37 12 d8 a5 8d f4 08 3a 1e 83 7e 6c 0a e9 75 ec 85 3d 56 f2 2e 4a 7d 71 88 29 26 99 40 43 4e f3 29 26 bf eb 15 be 36 22 72 f3 d9 be 4a e3 c9 0b cc 1 8 0.0155 (0.0000) C>S ChangeCipherSpec 1 9 0.0155 (0.0000) C>S Handshake 1 10 0.0245 (0.0089) S>C ChangeCipherSpec 1 11 0.0245 (0.0000) S>C Handshake 1 12 0.0250 (0.0005) C>S application_data 1 13 0.0250 (0.0000) C>S application_data 1 14 0.0258 (0.0007) S>C application_data 1 15 0.0258 (0.0000) S>C application_data 1 0.0261 (0.0002) C>S TCP FIN 1 0.0275 (0.0013) S>C TCP FIN 
 问候。 


Answer 3
		      	
 正如我在你对你之前的一个问题的评论中所说，你得到“ 格式错误的数据包：GSM over IP ”或者奇怪的事情是正常的。 
 您正在使用端口5000，它通常保留用于协议commplex-main 。 因此，在没有任何额外信息的情况下，Wireshark尝试使用commplex-main解码器分析它看到的流量。 
 当然，由于您在该端口上交换的数据实际上是SSL / TLS（因为您使用的端口通常不用commplex-main端口），因此将其解码为就像它是commplex-main导致一些奇数有关畸形数据包的消息。 
  Wireshark仅使用它看到的端口号猜测协议。 如果您没有使用该协议的标准端口，则必须告诉它尝试不同的解码器。 
 更具体地说， 右键单击数据包并选择Decode As …  – > Transport  – > SSL 。