/* * $Id: https-client-2.c,v 1.6 2005年02月19日 16:01:53 68user Exp $ * * HTTPS (SSL/TLS) クライアント (2) * サーバ認証・証明書情報の表示 * * written by 68user http://X68000.q-e-d.net/~68user/ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define BUF_LEN 256 /* root CA の証明書 */ #define ROOT_CA "ca-bundle.crt" void verify_ssl(SSL *ssl); int main(argc, argv) int argc; char *argv[]; { int err; int s; struct hostent *servhost; struct sockaddr_in server; struct servent *service; SSL *ssl; SSL_CTX *ctx; SSL_METHOD *(*ssl_method)() = SSLv23_client_method; X509 *server_cert; char request[BUF_LEN]; char *host = "www2.ggn.net"; char *path = "/cgi-bin/ssl"; if ( argc> 1 ){ if ( strcmp(argv[1], "-sslv2") == 0 ){ ssl_method = SSLv2_client_method; argc--; argv++; } else if ( strcmp(argv[1], "-sslv3") == 0 ){ ssl_method = SSLv3_client_method; argc--; argv++; } else if ( strcmp(argv[1], "-tlsv1") == 0 ){ ssl_method = TLSv1_client_method; argc--; argv++; } else if ( strcmp(argv[1], "-sslv23") == 0 ){ ssl_method = SSLv23_client_method; argc--; argv++; } } if ( argc == 3 ){ host = argv[1]; path = argv[2]; } servhost = gethostbyname(host); if ( servhost == NULL ){ fprintf(stderr, "[%s] から IP アドレスへの変換に失敗しました。\n", host); return 0; } bzero((char *)&server, sizeof(server)); server.sin_family = AF_INET; bcopy(servhost->h_addr, (char *)&server.sin_addr, servhost->h_length); /* ポート番号取得 */ service = getservbyname("https", "tcp"); if ( service != NULL ){ server.sin_port = service->s_port; } else { /* 取得できなかったら、ポート番号を 443 に決め打ち */ server.sin_port = htons(443); } s = socket(AF_INET, SOCK_STREAM, 0); if ( s < 0 ){ fprintf(stderr, "ソケットの生成に失敗しました。\n"); return 1; } if ( connect(s, (struct sockaddr*) &server, sizeof(server)) == -1 ){ fprintf(stderr, "connect に失敗しました。\n"); return 1; } /* ここからが SSL */ SSL_library_init(); SSL_load_error_strings(); ctx = SSL_CTX_new(ssl_method()); /* rootCA を登録 */ if ( ! SSL_CTX_load_verify_locations(ctx, ROOT_CA, NULL) ){ printf("rootCA [%s] の読み込みに失敗しましたが続行します。\n", ROOT_CA); } ssl = SSL_new(ctx); SSL_set_fd(ssl, s); err = SSL_connect(ssl); /* どの暗号化方式を使用するかを表示 (DES-CBC3-MD5 など) */ { const char *cipher; cipher = SSL_get_cipher(ssl); printf("使用する暗号化方式は %s です。\n", cipher); } /* どの SSL プロトコルを使用するかを表示 (SSLv2, SSLv3/TLSv1 など) */ { char *version; version = SSL_get_cipher_version(ssl); printf("使用するプロトコルは %s です。\n", version); } server_cert = SSL_get_peer_certificate(ssl); printf("サーバ証明書:\n"); { BIO *STDout = BIO_new_fp(stdout, BIO_NOCLOSE); BIO_printf(STDout, " Subject: "); X509_NAME_print_ex(STDout, X509_get_subject_name(server_cert), 0, XN_FLAG_RFC2253); BIO_printf(STDout, "\n"); BIO_printf(STDout, " Issuer: "); X509_NAME_print_ex(STDout, X509_get_issuer_name(server_cert), 0, XN_FLAG_RFC2253); BIO_printf(STDout, "\n"); ASN1_TIME *notBefore = X509_get_notBefore(server_cert); ASN1_TIME *notAfter = X509_get_notAfter(server_cert); BIO_printf(STDout, " 有効期限開始年月日: "); ASN1_TIME_print(STDout, notBefore); BIO_printf(STDout, "\n"); BIO_printf(STDout, " 有効期限終了年月日: "); ASN1_TIME_print(STDout, notAfter); BIO_printf(STDout, "\n"); BIO_free(STDout); } verify_ssl(ssl); X509_free(server_cert); /* リクエストを送る */ sprintf(request, "GET %s HTTP/1.0\r\nHost: %s\r\n\r\n", path, host); err = SSL_write(ssl, request, strlen(request)); /* web サーバからレスポンスを受け取る */ printf("サーバからのレスポンス\n"); while (1){ char buf[BUF_LEN]; int read_size; read_size = SSL_read(ssl, buf, sizeof(buf)-1); buf[read_size] = '0円'; if ( read_size> 0 ){ write(1, buf, read_size); } else { break; } } SSL_shutdown(ssl); close(s); SSL_free(ssl); SSL_CTX_free(ctx); return 0; } void verify_ssl(SSL *ssl){ long verify_result; struct sslerror_t { long result_code; char *ssl_error; char *ssl_errordetail; }; struct sslerror_t error_table[]={ {X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT, "unable to get issuer certificate. ", "the issuer certificate could not be found: this occurs if the" "issuer certificate of an untrusted certificate cannot be found." }, {X509_V_ERR_UNABLE_TO_GET_CRL, "unable to get certificate CRL. ", "the CRL of a certificate could not be found. Unused." }, {X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE, "unable to decrypt certificate's signature", "the certificate signature could not be decrypted. This means that" "the actual signature value could not be determined rather than it" "not matching the expected value, this is only meaningful for RSA keys" }, {X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE, "unable to decrypt CRL's signature", "the CRL signature could not be decrypted: this means that the" "actual signature value could not be determined rather than it not" "matching the expected value. Unused." }, {X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY, "unable to decode issuer public key", "the public key in the certificate SubjectPublicKeyInfo could not be read" }, {X509_V_ERR_CERT_SIGNATURE_FAILURE, "certificate signature failure", "the signature of the certificate is invalid" }, {X509_V_ERR_CRL_SIGNATURE_FAILURE, "CRL signature failure", "the signature of the certificate is invalid. Unused" }, {X509_V_ERR_CERT_NOT_YET_VALID, "証明書の有効期限が未来日付", "証明書が有効になる開始日付にまだ達していません。" "時刻設定がおかしくない?" }, {X509_V_ERR_CERT_HAS_EXPIRED, "証明書の有効期限切れ", "証明書が古いす", }, {X509_V_ERR_CRL_NOT_YET_VALID, "CRL is not yet valid", "the CRL is not yet valid. Unused." }, {X509_V_ERR_CRL_HAS_EXPIRED, "CRL has expired", "the CRL has expired. Unused." }, {X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD, "format error in certificate's notBefore field", "the certificate notBefore field contains an invalid time" }, {X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD, "format error in certificate's notAfter field", "the certificate notAfter field contains an invalid time." }, {X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD, "format error in CRL's lastUpdate field", "the CRL lastUpdate field contains an invalid time. Unused." }, {X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD, "format error in CRL's nextUpdate field", "the CRL nextUpdate field contains an invalid time. Unused.", }, {X509_V_ERR_OUT_OF_MEM, "メモリ不足", "メモリを確保できませんでした。このエラーは発生するべきではありません。" }, {X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT, "self signed certificate", "the passed certificate is self signed and the same certificate" "cannot be found in the list of trusted certificates." }, {X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN, "self signed certificate in certificate chain", "the certificate chain could be built up using the untrusted" "certificates but the root could not be found locally." }, {X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY, "unable to get local issuer certificate", "the issuer certificate of a locally looked up certificate could not" "be found. This normally means the list of trusted certificates is" "not complete." }, {X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE, "unable to verify the first certificate", "no signatures could be verified because the chain contains only one" "certificate and it is not self signed." }, {X509_V_ERR_CERT_CHAIN_TOO_LONG, "certificate chain too long", "the certificate chain length is greater than the supplied maximum" "depth. Unused." }, {X509_V_ERR_CERT_REVOKED, "certificate revoked", "the certificate has been revoked. Unused." }, {X509_V_ERR_INVALID_CA, "invalid CA certificate", "a CA certificate is invalid. Either it is not a CA or its" "extensions are not consistent with the supplied purpose." }, {X509_V_ERR_PATH_LENGTH_EXCEEDED, "path length constraint exceeded", "the basicConstraints pathlength parameter has been exceeded." }, {X509_V_ERR_INVALID_PURPOSE, "unsupported certificate purpose", "the supplied certificate cannot be used for the specified purpose." }, {X509_V_ERR_CERT_UNTRUSTED, "certificate not trusted", "the root CA is not marked as trusted for the specified purpose." }, {X509_V_ERR_CERT_REJECTED, "証明書が拒絶された", "the root CA is marked to reject the specified purpose.", }, {X509_V_ERR_SUBJECT_ISSUER_MISMATCH, "subject issuer mismatch", "the current candidate issuer certificate was rejected because its" "subject name did not match the issuer name of the current" "certificate. Only displayed when the -issuer_checks option is set." }, {X509_V_ERR_AKID_SKID_MISMATCH, "authority and subject key identifier mismatch", "the current candidate issuer certificate was rejected because its" "subject key identifier was present and did not match the authority" "key identifier current certificate. Only displayed when the" "-issuer_checks option is set." }, {X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH, "authority and issuer serial number mismatch", "the current candidate issuer certificate was rejected because its" "issuer name and serial number was present and did not match the" "authority key identifier of the current certificate. Only displayed" "when the -issuer_checks option is set." }, {X509_V_ERR_KEYUSAGE_NO_CERTSIGN, "key usage does not include certificate signing", "the current candidate issuer certificate was rejected because its" "keyUsage extension does not permit certificate signing." }, {X509_V_ERR_APPLICATION_VERIFICATION, "application verification failure", "an application specific error. Unused." } }; verify_result = SSL_get_verify_result(ssl); if ( verify_result == X509_V_OK ){ printf("認証に成功しました。エラーはありません。\n"); } else { int i; printf("認証時にエラー発生。続行します。\n"); for ( i=0 ; i

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