2 * Copyright (c) 2002 - 2003
3 * NetGroup, Politecnico di Torino (Italy)
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40 #include "portability.h"
44 static const char *ssl_keyfile = ""; //!< file containing the private key in PEM format
45 static const char *ssl_certfile = ""; //!< file containing the server's certificate in PEM format
46 static const char *ssl_rootfile = ""; //!< file containing the list of CAs trusted by the client
47 // TODO: a way to set ssl_rootfile from the command line, or an envvar?
52 void ssl_set_certfile(const char *certfile)
54 ssl_certfile = certfile;
57 void ssl_set_keyfile(const char *keyfile)
59 ssl_keyfile = keyfile;
62 int ssl_init_once(int is_server, int enable_compression, char *errbuf, size_t errbuflen)
64 static int inited = 0;
68 SSL_load_error_strings();
69 OpenSSL_add_ssl_algorithms();
70 if (enable_compression)
71 SSL_COMP_get_compression_methods();
73 SSL_METHOD const *meth =
74 is_server ? SSLv23_server_method() : SSLv23_client_method();
75 ctx = SSL_CTX_new(meth);
78 snprintf(errbuf, errbuflen, "Cannot get a new SSL context: %s", ERR_error_string(ERR_get_error(), NULL));
82 SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
86 char const *certfile = ssl_certfile[0] ? ssl_certfile : "cert.pem";
87 if (1 != SSL_CTX_use_certificate_file(ctx, certfile, SSL_FILETYPE_PEM))
89 snprintf(errbuf, errbuflen, "Cannot read certificate file %s: %s", certfile, ERR_error_string(ERR_get_error(), NULL));
93 char const *keyfile = ssl_keyfile[0] ? ssl_keyfile : "key.pem";
94 if (1 != SSL_CTX_use_PrivateKey_file(ctx, keyfile, SSL_FILETYPE_PEM))
96 snprintf(errbuf, errbuflen, "Cannot read private key file %s: %s", keyfile, ERR_error_string(ERR_get_error(), NULL));
104 if (! SSL_CTX_load_verify_locations(ctx, ssl_rootfile, 0))
106 snprintf(errbuf, errbuflen, "Cannot read CA list from %s", ssl_rootfile);
112 SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, NULL);
117 if (! RAND_load_file(RANDOM, 1024*1024))
119 snprintf(errbuf, errbuflen, "Cannot init random");
125 SSL_CTX_set_session_id_context(ctx, (void *)&s_server_session_id_context, sizeof(s_server_session_id_context));
136 SSL *ssl_promotion(int is_server, SOCKET s, char *errbuf, size_t errbuflen)
138 if (ssl_init_once(is_server, 1, errbuf, errbuflen) < 0) {
142 SSL *ssl = SSL_new(ctx); // TODO: also a DTLS context
143 SSL_set_fd(ssl, (int)s);
146 if (SSL_accept(ssl) <= 0) {
147 snprintf(errbuf, errbuflen, "SSL_accept(): %s",
148 ERR_error_string(ERR_get_error(), NULL));
152 if (SSL_connect(ssl) <= 0) {
153 snprintf(errbuf, errbuflen, "SSL_connect(): %s",
154 ERR_error_string(ERR_get_error(), NULL));
162 // Finish using an SSL handle; shut down the connection and free the
164 void ssl_finish(SSL *ssl)
167 // We won't be using this again, so we can just send the
168 // shutdown alert and free up the handle, and have our
169 // caller close the socket.
171 // XXX - presumably, if the connection is shut down on
172 // our side, either our peer won't have a problem sending
173 // their shutdown alert or will not treat such a problem
174 // as an error. If this causes errors to be reported,
175 // fix that as appropriate.
181 // Same return value as sock_send:
182 // 0 on OK, -1 on error but closed connection (-2).
183 int ssl_send(SSL *ssl, char const *buffer, int size, char *errbuf, size_t errbuflen)
185 int status = SSL_write(ssl, buffer, size);
188 // "SSL_write() will only return with success, when the complete contents (...) has been written."
193 int ssl_err = SSL_get_error(ssl, status); // TODO: does it pop the error?
194 if (ssl_err == SSL_ERROR_ZERO_RETURN)
198 else if (ssl_err == SSL_ERROR_SYSCALL)
201 if (errno == ECONNRESET || errno == EPIPE) return -2;
204 snprintf(errbuf, errbuflen, "SSL_write(): %s",
205 ERR_error_string(ERR_get_error(), NULL));
210 // Returns the number of bytes read, or -1 on syserror, or -2 on SSL error.
211 int ssl_recv(SSL *ssl, char *buffer, int size, char *errbuf, size_t errbuflen)
213 int status = SSL_read(ssl, buffer, size);
216 int ssl_err = SSL_get_error(ssl, status);
217 if (ssl_err == SSL_ERROR_ZERO_RETURN)
221 else if (ssl_err == SSL_ERROR_SYSCALL)
228 snprintf(errbuf, errbuflen, "SSL_read(): %s",
229 ERR_error_string(ERR_get_error(), NULL));
239 #endif // HAVE_OPENSSL