2012-07-26 65 views
1

我試圖使用來自:http://simplestcodings.blogspot.com.br/2010/08/secure-server-client-using-openssl-in-c.html的SSL客戶端/服務器示例來創建使用SSLv3的安全連接,但未成功。爲什麼我的服務器總是迴應「沒有證書」?

我更改了客戶端以嘗試在客戶端加載證書,添加了服務器示例中存在的LoadCertificates函數。 我已在this tutorial之後創建了我的證書。

我的問題是,當我連接到服務器時,客戶端可以看到有關服務器證書的信息,但服務器從未加載關於客戶端證書的信息。

這裏是我的客戶端代碼:

//SSL-Client.c 
#include <stdio.h> 
#include <errno.h> 
#include <unistd.h> 
#include <malloc.h> 
#include <string.h> 
#include <sys/socket.h> 
#include <resolv.h> 
#include <netdb.h> 
#include <openssl/ssl.h> 
#include <openssl/err.h> 

#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) <= 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(); 
    } 
} 

int OpenConnection(const char *hostname, int port) 
{ int sd; 
    struct hostent *host; 
    struct sockaddr_in addr; 

    if ((host = gethostbyname(hostname)) == NULL) 
    { 
     perror(hostname); 
     abort(); 
    } 
    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 = *(long*)(host->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(int count, char *strings[]) 
{ SSL_CTX *ctx; 
    int server; 
    SSL *ssl; 
    char buf[1024]; 
    int bytes; 
    char *hostname, *portnum; 
    char CertFile[] = "/home/myCA/cacert.pem"; 
    char KeyFile[] = "/home/myCA/private/cakey.pem"; 

    SSL_library_init(); 
hostname=strings[1]; 
portnum=strings[2]; 

    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; 
} 

而且服務器:

//SSL-Server.c 
#include <errno.h> 
#include <unistd.h> 
#include <malloc.h> 
#include <string.h> 
#include <arpa/inet.h> 
#include <sys/socket.h> 
#include <sys/types.h> 
#include <netinet/in.h> 
#include <resolv.h> 
#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) 
{ 
/* 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(); 
    } 
} 

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="<html><body><pre>%s</pre></body></html>\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(int count, char *strings[]) 
{ SSL_CTX *ctx; 
    int server; 
    char *portnum; 

    char CertFile[] = "/home/myCA/cacert.pem"; 
    char KeyFile[] = "/home/myCA/private/cakey.pem"; 

    SSL_library_init(); 

    portnum = strings[1]; 
    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 */ 
} 

編輯:

我現在已經在服務器上更改LoadCertificates如下。

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 
    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 
} 

LoadCertificates這些變化之後,當我啓動服務器,並從客戶端的連接,就可以看到有關服務器證書的信息,而該服務器現在載入關於客戶端證書的信息,但協議,如Wireshar所見,不會改變。

事實上,根據接受的答案中提出的更改,服務器端和客戶端都可以看到證書,但從Wireshark查看連接顯示協議SSLv3(SSLv23,SSLv2,SSLv1)不起作用。我不明白問題是什麼。 Wireshark只顯示協議TCP或IPA,而對於IPA數據包,信息總是RSL格式錯誤的數據包。

+0

的問題,因爲你現在已經修改了,聽起來像一個完全不同的問題(或者兩個組合) 。在這種情況下問一個不同的問題會更好。不過,您可能不需要,因爲它聽起來像[本答案](http://stackoverflow.com/a/10532296/372643)中所述的相同問題。 – Bruno 2012-07-27 21:32:08

+0

再次,請不要通過更改初始文本來重新編輯。如果你對這個問題有補充,把它們放在最後。根據您最近的變化(10分鐘前),現在的答案與問題無關。 (正如我在之前的評論中所說的,閱讀[this](http://stackoverflow.com/a/10532296/372643)。) – Bruno 2012-07-28 15:09:40

+0

我改變了問題,因爲我發現了一個新問題。第一個問題是服務器端沒有加載客戶端證書,解決之後,我測試了協議,並且它不像通信TLS/SSL那樣工作。如果您在JAVA上使用套接字示例客戶端和服務器使用SSL,那麼wireshark會顯示協議/信息SSLv3/SSLv23,而我正在嘗試使用C/C++的示例沒有相同的行爲。這個問題有很多問題,我想解決所有問題。 – 2012-07-28 16:13:07

回答

3

http://www.openssl.org/docs/ssl/SSL_get_peer_certificate.html

由於協議定義,TLS/SSL服務器總是發送 證書,如果存在的話。當服務器明確要求 這樣做時,客戶端只會發送證書(請參閱 SSL_CTX_set_verify(3))。

服務器應該調用類似:

SSL_CTX_set_verify(SSL_get_SSL_CTX(ssl), SSL_VERIFY_PEER, NULL); 

前:

if (SSL_accept(ssl) == FAIL) 
+0

編輯更改呼叫網站。 – 2012-07-26 22:00:53

+0

謝謝..因爲在你的回答中,我找到了一本書「Network Security with OpenSSL」,示例server2.c。 – 2012-07-27 03:12:11

+0

我看到示例並更改了我的代碼,謝謝! – 2012-07-27 03:48:04

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