snapshot of project "lynx", label v2-8-8dev_3c

1 files changed, 601 insertions, 0 deletions

diff --git a/src/tidy_tls.c b/src/tidy_tls.c
new file mode 100644
index 00000000..473020cd
--- /dev/null
+++ b/src/tidy_tls.c
@@ -0,0 +1,601 @@
+/*
+ * $LynxId: tidy_tls.c,v 1.4 2010/04/29 20:49:46 tom Exp $
+ * Copyright 2008, Thomas E. Dickey
+ * with fix Copyright 2008 by Thomas Viehmann
+ *
+ * Required libraries:
+ *	libgnutls
+ *	libcrypt
+ */
+#include <tidy_tls.h>
+
+#include <gnutls/x509.h>
+#include <gcrypt.h>
+#include <libtasn1.h>		/* ASN1_SUCCESS,etc */
+#include <string.h>
+
+#define typeCalloc(type) (type *) calloc(1, sizeof(type))
+
+static int last_error = 0;
+
+/* ugly, but hey, we could just use a more sane api, too */
+#define GetDnByOID(target, oid, thewhat) \
+		len = sizeof(target); \
+                if (! thewhat) \
+		  gnutls_x509_crt_get_dn_by_oid(xcert, oid, 0, 0, target, &len); \
+                else \
+                  gnutls_x509_crt_get_issuer_dn_by_oid(xcert, oid, 0, 0, target, &len)
+
+/* thewhat: which DN to get 0 = subject, 1 = issuer */
+static int ExtractCertificate(const gnutls_datum_t * cert, X509_NAME * result, int thewhat)
+{
+    gnutls_x509_crt_t xcert;
+    int rc;
+    size_t len;
+
+    if ((rc = gnutls_x509_crt_init(&xcert)) >= 0) {
+	if ((rc = gnutls_x509_crt_import(xcert, cert, GNUTLS_X509_FMT_DER)) >= 0) {
+	    GetDnByOID(result->country,
+		       GNUTLS_OID_X520_COUNTRY_NAME, thewhat);
+	    GetDnByOID(result->organization,
+		       GNUTLS_OID_X520_ORGANIZATION_NAME, thewhat);
+	    GetDnByOID(result->organizational_unit_name,
+		       GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME, thewhat);
+	    GetDnByOID(result->common_name,
+		       GNUTLS_OID_X520_COMMON_NAME, thewhat);
+	    GetDnByOID(result->locality_name,
+		       GNUTLS_OID_X520_LOCALITY_NAME, thewhat);
+	    GetDnByOID(result->state_or_province_name,
+		       GNUTLS_OID_X520_STATE_OR_PROVINCE_NAME, thewhat);
+	    GetDnByOID(result->email,
+		       GNUTLS_OID_PKCS9_EMAIL, thewhat);
+	    rc = 0;
+	}
+	gnutls_x509_crt_deinit(xcert);
+    }
+    return rc;
+}
+
+/*
+ * (stub)
+ * ERR_error_string() generates a human-readable string representing the
+ * error code 'e', and places it at 'buffer', which must be at least 120 bytes
+ * long. If 'buffer' is NULL, the error string is placed in a static buffer.
+ */
+const char *ERR_error_string(unsigned long e, char *buffer)
+{
+    (void) buffer;
+    return gnutls_strerror(-e);
+}
+
+/*
+ * (stub)
+ * Return the earliest error code from the thread's error queue and remove the
+ * entry.
+ */
+unsigned long ERR_get_error(void)
+{
+    unsigned long rc;
+
+    rc = -last_error;
+    last_error = 0;
+
+    return rc;
+}
+
+/*
+ * Put 'num' cryptographically strong pseudo-random bytes into 'buffer'.
+ */
+int RAND_bytes(unsigned char *buffer, int num)
+{
+    gcry_randomize(buffer, num, GCRY_VERY_STRONG_RANDOM);
+    return 1;
+}
+
+/*
+ * (stub)
+ * Generate a default path for the random seed file.  'buffer' points to a
+ * buffer of size 'len' in which to store the filename.
+ */
+const char *RAND_file_name(char *buffer, size_t len)
+{
+    (void) buffer;
+    (void) len;
+    return "";
+}
+
+/*
+ * (stub)
+ * Read a number of bytes from file 'name' and adds them to the PRNG.  If
+ * 'maxbytes' is non-negative, up to to 'maxbytes' are read; if 'maxbytes' is
+ * -1, the complete file is read.
+ */
+int RAND_load_file(const char *name, long maxbytes)
+{
+    (void) name;
+    return maxbytes;
+}
+
+/*
+ * (stub)
+ * Mix the 'num' bytes at 'buffer' into the PRNG state.
+ */
+void RAND_seed(const void *buffer, int num)
+{
+    (void) buffer;
+    (void) num;
+}
+
+/*
+ * (stub)
+ * Return 1 if the PRNG has been seeded with enough data, 0 otherwise.
+ */
+int RAND_status(void)
+{
+    return 1;
+}
+
+/*
+ * (stub)
+ * Write a number of random bytes (currently 1024) to file 'name' which can be
+ * used to initialize the PRNG by calling RAND_load_file() in a later session.
+ */
+int RAND_write_file(const char *name)
+{
+    (void) name;
+    return 0;
+}
+
+/*
+ * Return the number of secret bits used for cipher.  If 'bits' is not NULL, it
+ * contains the number of bits processed by the chosen algorithm.  If cipher is
+ * NULL, 0 is returned.
+ */
+int SSL_CIPHER_get_bits(SSL_CIPHER * cipher, int *bits)
+{
+    int result = 0;
+
+    if (cipher) {
+	result = (8 * gnutls_cipher_get_key_size(cipher->encrypts));
+    }
+
+    if (bits)
+	*bits = result;
+
+    return result;
+}
+
+/*
+ * Return a pointer to the name of 'cipher'.  If 'cipher' is NULL the constant
+ * value "NONE" is returned.
+ */
+const char *SSL_CIPHER_get_name(SSL_CIPHER * cipher)
+{
+    const char *result = "NONE";
+
+    if (cipher) {
+	result = gnutls_cipher_suite_get_name(cipher->key_xchg,
+					      cipher->encrypts,
+					      cipher->msg_code);
+    }
+    return result;
+}
+
+/*
+ * Return the protocol version for cipher, currently "SSLv2", "SSLv3", or
+ * "TLSv1".  If cipher is NULL, "(NONE)" is returned.
+ */
+const char *SSL_CIPHER_get_version(SSL_CIPHER * cipher)
+{
+    const char *result = "NONE";
+
+    if (cipher) {
+	if ((result = gnutls_protocol_get_name(cipher->protocol)) == 0)
+	    result = "unknown";
+    }
+    return result;
+}
+
+/*
+ * Free an allocated SSL_CTX object.
+ */
+void SSL_CTX_free(SSL_CTX * ctx)
+{
+    free(ctx->method);
+    free(ctx);
+}
+
+/*
+ * Create a new SSL_CTX object as framework for TLS/SSL enabled functions.
+ */
+SSL_CTX *SSL_CTX_new(SSL_METHOD * method)
+{
+    SSL_CTX *ctx;
+
+    ctx = typeCalloc(SSL_CTX);
+    ctx->method = method;
+
+    return ctx;
+}
+
+/*
+ * See SSL_CTX_load_verify_locations() - this sets the paths for that and
+ * SSL_CTX_set_verify() to their default values.  GNU TLS does not have a
+ * comparable feature (stub).
+ */
+int SSL_CTX_set_default_verify_paths(SSL_CTX * ctx)
+{
+    (void) ctx;
+    return 0;
+}
+
+/*
+ * SSL_CTX_set_options() adds the options set via bitmask in options to
+ * ctx.  Options already set before are not cleared.
+ */
+unsigned long SSL_CTX_set_options(SSL_CTX * ctx, unsigned long options)
+{
+    ctx->options |= options;
+    return ctx->options;
+}
+
+/*
+ * Set peer certificate verification parameters.
+ */
+void SSL_CTX_set_verify(SSL_CTX * ctx, int verify_mode,
+			int (*verify_callback) (int, X509_STORE_CTX *))
+{
+    ctx->verify_mode = verify_mode;
+    ctx->verify_callback = verify_callback;
+}
+
+static void RemoveProtocol(SSL * ssl, int protocol)
+{
+    int j, k;
+    int changed = 0;
+    int *protocols = ssl->ctx->method->priority.protocol;
+
+    for (j = k = 0; j < GNUTLS_MAX_ALGORITHM_NUM;) {
+	if (protocols[k] == protocol) {
+	    if (++k >= GNUTLS_MAX_ALGORITHM_NUM)
+		break;
+	    changed = 1;
+	} else {
+	    protocols[j++] = protocols[k++];
+	}
+    }
+
+    if (changed) {
+	gnutls_protocol_set_priority(ssl->gnutls_state, protocols);
+    }
+}
+
+/*
+ * Initiate the TLS/SSL handshake with an TLS/SSL server.
+ */
+int SSL_connect(SSL * ssl)
+{
+    X509_STORE_CTX *store;
+    int rc;
+
+    if (ssl->options & SSL_OP_NO_TLSv1)
+	RemoveProtocol(ssl, GNUTLS_TLS1);
+    if (ssl->options & SSL_OP_NO_SSLv3)
+	RemoveProtocol(ssl, GNUTLS_SSL3);
+
+    rc = gnutls_handshake(ssl->gnutls_state);
+    ssl->last_error = rc;
+
+    if (rc < 0) {
+	last_error = rc;
+	return 0;
+    }
+
+    store = typeCalloc(X509_STORE_CTX);
+    store->ssl = ssl;
+    store->cert_list = SSL_get_peer_certificate(ssl);
+
+    if (ssl->verify_callback) {
+	ssl->verify_callback(1, store);
+    }
+    ssl->state = SSL_ST_OK;
+
+    free(store);
+
+    /* FIXME: deal with error from callback */
+
+    return 1;
+}
+
+/*
+ * Free an allocated SSL structure.
+ */
+void SSL_free(SSL * ssl)
+{
+    gnutls_certificate_free_credentials(ssl->gnutls_cred);
+    gnutls_deinit(ssl->gnutls_state);
+    free(ssl);
+}
+
+/*
+ * Get SSL_CIPHER data of a connection.
+ */
+SSL_CIPHER *SSL_get_current_cipher(SSL * ssl)
+{
+    SSL_CIPHER *result = 0;
+
+    if (ssl) {
+	result = &(ssl->ciphersuite);
+
+	result->protocol = gnutls_protocol_get_version(ssl->gnutls_state);
+	result->encrypts = gnutls_cipher_get(ssl->gnutls_state);
+	result->key_xchg = gnutls_kx_get(ssl->gnutls_state);
+	result->msg_code = gnutls_mac_get(ssl->gnutls_state);
+	result->compress = gnutls_compression_get(ssl->gnutls_state);
+	result->cert = gnutls_certificate_type_get(ssl->gnutls_state);
+    }
+
+    return result;
+}
+
+/*
+ * Get the X509 certificate of the peer.
+ */
+X509 *SSL_get_peer_certificate(SSL * ssl)
+{
+    gnutls_datum_t *result;
+    unsigned list_size = 0;
+
+    result = (gnutls_datum_t *) gnutls_certificate_get_peers(ssl->gnutls_state,
+							     &list_size);
+
+    return (X509 *) result;
+}
+
+/*
+ * Initialize SSL library by registering algorithms.
+ */
+int SSL_library_init(void)
+{
+    gnutls_global_init();
+    return 1;
+}
+
+/*
+ * (stub)
+ * OpenSSL uses this to prepare for ERR_get_error() calls.
+ */
+void SSL_load_error_strings(void)
+{
+}
+
+/*
+ * Create a new SSL structure for a connection.
+ */
+SSL *SSL_new(SSL_CTX * ctx)
+{
+    SSL *ssl;
+    int rc;
+
+    if ((ssl = typeCalloc(SSL)) != 0) {
+
+	rc = gnutls_certificate_allocate_credentials(&ssl->gnutls_cred);
+	if (rc < 0) {
+	    last_error = rc;
+	    free(ssl);
+	    ssl = 0;
+	} else {
+
+	    gnutls_init(&ssl->gnutls_state, ctx->method->connend);
+
+	    gnutls_protocol_set_priority(ssl->gnutls_state,
+					 ctx->method->priority.protocol);
+	    gnutls_cipher_set_priority(ssl->gnutls_state,
+				       ctx->method->priority.encrypts);
+	    gnutls_compression_set_priority(ssl->gnutls_state,
+					    ctx->method->priority.compress);
+	    gnutls_kx_set_priority(ssl->gnutls_state,
+				   ctx->method->priority.key_xchg);
+	    gnutls_mac_set_priority(ssl->gnutls_state,
+				    ctx->method->priority.msg_code);
+
+	    gnutls_credentials_set(ssl->gnutls_state, GNUTLS_CRD_CERTIFICATE,
+				   ssl->gnutls_cred);
+	    if (ctx->certfile)
+		gnutls_certificate_set_x509_trust_file(ssl->gnutls_cred,
+						       ctx->certfile,
+						       ctx->certfile_type);
+	    if (ctx->keyfile)
+		gnutls_certificate_set_x509_key_file(ssl->gnutls_cred,
+						     ctx->certfile,
+						     ctx->keyfile,
+						     ctx->keyfile_type);
+	    ssl->ctx = ctx;
+	    ssl->verify_mode = ctx->verify_mode;
+	    ssl->verify_callback = ctx->verify_callback;
+
+	    ssl->options = ctx->options;
+
+	    ssl->rfd = (gnutls_transport_ptr_t) (-1);
+	    ssl->wfd = (gnutls_transport_ptr_t) (-1);
+	}
+    }
+    return ssl;
+}
+
+/*
+ * Read 'length' bytes into 'buffer' from the given SSL connection.
+ * Returns the number of bytes read, or zero on error.
+ */
+int SSL_read(SSL * ssl, void *buffer, int length)
+{
+    int rc;
+
+    rc = gnutls_record_recv(ssl->gnutls_state, buffer, length);
+    ssl->last_error = rc;
+
+    if (rc < 0) {
+	last_error = rc;
+	rc = 0;
+    }
+
+    return rc;
+}
+
+/*
+ * Connect the SSL object with a file descriptor.
+ * This always returns 1 (success) since GNU TLS does not check for errors.
+ */
+int SSL_set_fd(SSL * ssl, int fd)
+{
+    gnutls_transport_set_ptr(ssl->gnutls_state,
+			     (gnutls_transport_ptr_t) (fd));
+    return 1;
+}
+
+/*
+ * Write 'length' bytes from 'buffer' to the given SSL connection.
+ */
+int SSL_write(SSL * ssl, const void *buffer, int length)
+{
+    int rc;
+
+    rc = gnutls_record_send(ssl->gnutls_state, buffer, length);
+    ssl->last_error = rc;
+
+    if (rc < 0) {
+	last_error = rc;
+	rc = 0;
+    }
+
+    return rc;
+}
+
+/*
+ * Return method-data for SSL verion 3, with the option of rollback to SSL
+ * version 2.
+ */
+SSL_METHOD *SSLv23_client_method(void)
+{
+    SSL_METHOD *m;
+
+    if ((m = typeCalloc(SSL_METHOD)) != 0) {
+
+	/*
+	 * List the protocols in decreasing order of priority.
+	 */
+	m->priority.protocol[0] = GNUTLS_TLS1;
+	m->priority.protocol[1] = GNUTLS_SSL3;
+	m->priority.protocol[2] = 0;
+
+	/*
+	 * List the cipher algorithms in decreasing order of priority.
+	 */
+	m->priority.encrypts[0] = GNUTLS_CIPHER_AES_128_CBC;
+	m->priority.encrypts[1] = GNUTLS_CIPHER_3DES_CBC;
+	m->priority.encrypts[2] = GNUTLS_CIPHER_AES_256_CBC;
+	m->priority.encrypts[3] = GNUTLS_CIPHER_ARCFOUR_128;
+	m->priority.encrypts[4] = 0;
+
+	/*
+	 * List the compression algorithms in decreasing order of priority.
+	 */
+	m->priority.compress[0] = GNUTLS_COMP_ZLIB;
+	m->priority.compress[1] = GNUTLS_COMP_NULL;
+	m->priority.compress[2] = 0;
+
+	/*
+	 * List the key exchange algorithms in decreasing order of priority.
+	 */
+	m->priority.key_xchg[0] = GNUTLS_KX_DHE_RSA;
+	m->priority.key_xchg[1] = GNUTLS_KX_RSA;
+	m->priority.key_xchg[2] = GNUTLS_KX_DHE_DSS;
+	m->priority.key_xchg[3] = 0;
+
+	/*
+	 * List message authentication code (MAC) algorithms in decreasing
+	 * order of priority to specify via gnutls_mac_set_priority().
+	 */
+	m->priority.msg_code[0] = GNUTLS_MAC_SHA1;
+	m->priority.msg_code[1] = GNUTLS_MAC_MD5;
+	m->priority.msg_code[2] = 0;
+
+	/*
+	 * For gnutls_init, says we're a client.
+	 */
+	m->connend = GNUTLS_CLIENT;
+    }
+
+    return m;
+}
+
+static int add_name(char *target, int len, const char *tag, const char *data)
+{
+    int need = strlen(tag);
+
+    target += strlen(target);
+    if (need < len) {
+	strcat(target, tag);
+	len -= need;
+	target += need;
+    }
+    need = strlen(data);
+    if (need >= len - 1)
+	need = len - 1;
+    strncat(target, data, need)[need] = '\0';
+    return len;
+}
+#define ADD_NAME(tag, data) len = add_name(target, len, tag, data);
+
+/*
+ * Convert the X509 name 'source' to a string in the given buffer 'target',
+ * whose length is 'len'.  Return a pointer to the buffer.
+ */
+char *X509_NAME_oneline(X509_NAME * source, char *target, int len)
+{
+    if (target && (len > 0)) {
+	*target = '\0';
+	if (source) {
+	    ADD_NAME("C=", source->country);
+	    ADD_NAME(", ST=", source->state_or_province_name);
+	    ADD_NAME(", L=", source->locality_name);
+	    ADD_NAME(", O=", source->organization);
+	    ADD_NAME(", OU=", source->organizational_unit_name);
+	    ADD_NAME(", CN=", source->common_name);
+	    ADD_NAME("/Email=", source->email);
+	}
+    }
+    return target;
+}
+
+/*
+ * Extract the certificate's issuer-name data.
+ */
+X509_NAME *X509_get_issuer_name(const X509 * cert)
+{
+    X509_NAME *result;
+
+    if ((result = typeCalloc(X509_NAME)) != 0) {
+	if (ExtractCertificate(cert, result, 1) < 0) {
+	    free(result);
+	    result = 0;
+	}
+    }
+    return result;
+}
+
+/*
+ * Extract the certificate's subject-name data.
+ */
+X509_NAME *X509_get_subject_name(const X509 * cert)
+{
+    X509_NAME *result;
+
+    if ((result = typeCalloc(X509_NAME)) != 0) {
+	if (ExtractCertificate(cert, result, 0) < 0) {
+	    free(result);
+	    result = 0;
+	}
+    }
+    return result;
+}