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-rw-r--r--src/tidy_tls.c707
1 files changed, 707 insertions, 0 deletions
diff --git a/src/tidy_tls.c b/src/tidy_tls.c
new file mode 100644
index 0000000..b0288fb
--- /dev/null
+++ b/src/tidy_tls.c
@@ -0,0 +1,707 @@
+/*
+ * $LynxId: tidy_tls.c,v 1.41 2020/03/03 11:46:07 Gisle.Vanem Exp $
+ * Copyright 2008-2019,2020 Thomas E. Dickey
+ * with fix Copyright 2008 by Thomas Viehmann
+ *
+ * Required libraries:
+ * libgnutls
+ * libcrypt
+ */
+#include <HTUtils.h>
+#include <tidy_tls.h>
+
+#include <gnutls/x509.h>
+#ifdef HAVE_GNUTLS_RND
+#include <gnutls/crypto.h>
+#else
+#include <gcrypt.h>
+#endif
+#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((int) -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 = (unsigned long) (-last_error);
+ last_error = 0;
+
+ return rc;
+}
+
+/*
+ * Put 'num' cryptographically strong pseudo-random bytes into 'buffer'.
+ */
+int RAND_bytes(unsigned char *buffer, int num)
+{
+ int rc;
+
+#ifdef HAVE_GNUTLS_RND
+ rc = gnutls_rnd(GNUTLS_RND_KEY, buffer, (size_t) num);
+#else
+ gcry_randomize(buffer, num, GCRY_VERY_STRONG_RANDOM);
+ rc = 1;
+#endif
+ return rc;
+}
+
+/*
+ * (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 (int) 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 * (int) 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;
+
+ if ((ctx = typeCalloc(SSL_CTX)) != 0) {
+ 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;
+}
+
+#ifdef HAVE_GNUTLS_PROTOCOL_SET_PRIORITY
+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);
+ }
+}
+#endif
+
+/*
+ * Initiate the TLS/SSL handshake with an TLS/SSL server.
+ */
+int SSL_connect(SSL * ssl)
+{
+ X509_STORE_CTX *store;
+ int rc;
+ gnutls_alert_description_t alert;
+ const char *aname;
+
+ if (ssl->options & SSL_OP_NO_TLSv1) {
+#ifdef HAVE_GNUTLS_PROTOCOL_SET_PRIORITY
+ RemoveProtocol(ssl, GNUTLS_TLS1);
+#else
+ gnutls_priority_set_direct(ssl->gnutls_state, "NORMAL:-VERS-TLS1.0", NULL);
+#endif
+ }
+
+ while ((rc = gnutls_handshake(ssl->gnutls_state)) < 0 &&
+ !gnutls_error_is_fatal(rc)) {
+ if (rc == GNUTLS_E_WARNING_ALERT_RECEIVED) {
+ alert = gnutls_alert_get(ssl->gnutls_state);
+ aname = gnutls_alert_get_name(alert);
+ CTRACE((tfp, "SSL Alert: %s\n", NonNull(aname)));
+ switch (gnutls_alert_get(ssl->gnutls_state)) {
+ case GNUTLS_A_UNRECOGNIZED_NAME:
+ continue; /* ignore */
+ default:
+ break;
+ }
+ break; /* treat all other alerts as fatal */
+ }
+ }
+ ssl->last_error = rc;
+
+ if (rc < 0) {
+ last_error = rc;
+ return 0;
+ }
+
+ store = typeCalloc(X509_STORE_CTX);
+ if (store == 0)
+ outofmem(__FILE__, "SSL_connect");
+
+ 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->cert = gnutls_certificate_type_get(ssl->gnutls_state);
+#if !defined(_GNUTLS_GCC_VERSION) || (_GNUTLS_GCC_VERSION < 30100)
+ result->compress = gnutls_compression_get(ssl->gnutls_state);
+#else
+ result->compress = GNUTLS_COMP_UNKNOWN;
+#endif
+ }
+
+ return result;
+}
+
+/*
+ * Get the X509 certificate of the peer.
+ */
+const X509 *SSL_get_peer_certificate(SSL * ssl)
+{
+ const gnutls_datum_t *result;
+ unsigned list_size = 0;
+
+ result =
+ (const gnutls_datum_t *) gnutls_certificate_get_peers(ssl->gnutls_state,
+ &list_size);
+
+ return (const 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 {
+ ssl->ctx = ctx;
+
+ gnutls_init(&ssl->gnutls_state, ctx->method->connend);
+ gnutls_set_default_priority(ssl->gnutls_state);
+
+ 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->client_keyfile)
+ gnutls_certificate_set_x509_key_file(ssl->gnutls_cred,
+ ctx->client_certfile,
+ ctx->client_keyfile,
+ ctx->client_keyfile_type);
+ 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);
+ ssl->bytes_sent = 0;
+ ssl->sendbuffer = 0;
+ }
+ }
+
+ 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;
+
+ do {
+ rc = (int) gnutls_record_recv(ssl->gnutls_state, buffer, (size_t) length);
+ }
+ while ((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED));
+
+ if (rc < 0 && gnutls_error_is_fatal(rc) == 0) {
+ if (rc == GNUTLS_E_REHANDSHAKE) {
+ (void) gnutls_handshake(ssl->gnutls_state);
+ do {
+ rc = (int) gnutls_record_send(ssl->gnutls_state,
+ ssl->sendbuffer,
+ (size_t) ssl->bytes_sent);
+ }
+ while ((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED));
+ do {
+ rc = (int) gnutls_record_recv(ssl->gnutls_state,
+ buffer,
+ (size_t) length);
+ }
+ while ((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED));
+ }
+ }
+
+ ssl->last_error = rc;
+
+ if (rc < 0) {
+ last_error = rc;
+ rc = 0;
+ }
+
+ return rc;
+}
+
+#ifdef _WINDOWS
+static int Lynx_gtls_push(void *s, const void *buf, size_t len)
+{
+ return NETWRITE((SOCKET) s, buf, len);
+}
+
+/* This calls 'recv()' in a thread for every GnuTls pull. Maybe too much overhead?
+ */
+static int Lynx_gtls_pull(void *s, void *buf, size_t len)
+{
+ return NETREAD((SOCKET) s, buf, len);
+}
+#endif
+
+/*
+ * 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)
+{
+#ifdef _WINDOWS
+ /* register callback functions to send and receive data. */
+ gnutls_transport_set_push_function(ssl->gnutls_state, Lynx_gtls_push);
+ gnutls_transport_set_pull_function(ssl->gnutls_state, Lynx_gtls_pull);
+#endif
+
+ gnutls_transport_set_ptr(ssl->gnutls_state,
+ (gnutls_transport_ptr_t) (intptr_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;
+
+ do {
+ rc = (int) gnutls_record_send(ssl->gnutls_state, buffer, (size_t) length);
+ }
+ while ((rc == GNUTLS_E_AGAIN) || (rc == GNUTLS_E_INTERRUPTED));
+ ssl->last_error = rc;
+
+ if (rc < 0) {
+ last_error = rc;
+ rc = 0;
+ } else {
+ size_t need = (size_t) rc;
+
+ free(ssl->sendbuffer);
+ ssl->sendbuffer = malloc(need);
+ ssl->bytes_sent = need;
+ }
+
+ return rc;
+}
+
+/*
+ * Return method-data for SSL version 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) {
+ int n;
+
+ /*
+ * List the protocols in decreasing order of priority.
+ */
+ n = 0;
+#if GNUTLS_VERSION_NUMBER >= 0x030000
+ m->priority.protocol[n++] = GNUTLS_SSL3;
+ m->priority.protocol[n++] = GNUTLS_TLS1_2;
+#endif
+ m->priority.protocol[n++] = GNUTLS_TLS1_1;
+ m->priority.protocol[n++] = GNUTLS_TLS1_0;
+ m->priority.protocol[n] = 0;
+
+ /*
+ * List the cipher algorithms in decreasing order of priority.
+ */
+ n = 0;
+#if GNUTLS_VERSION_NUMBER >= 0x030000
+ m->priority.encrypts[n++] = GNUTLS_CIPHER_AES_256_GCM;
+ m->priority.encrypts[n++] = GNUTLS_CIPHER_AES_128_GCM;
+#endif
+ m->priority.encrypts[n++] = GNUTLS_CIPHER_AES_256_CBC;
+ m->priority.encrypts[n++] = GNUTLS_CIPHER_AES_128_CBC;
+ m->priority.encrypts[n++] = GNUTLS_CIPHER_CAMELLIA_256_CBC;
+ m->priority.encrypts[n++] = GNUTLS_CIPHER_CAMELLIA_128_CBC;
+ m->priority.encrypts[n++] = GNUTLS_CIPHER_3DES_CBC;
+ m->priority.encrypts[n] = 0;
+
+ /*
+ * List the compression algorithms in decreasing order of priority.
+ */
+ n = 0;
+ m->priority.compress[n++] = GNUTLS_COMP_NULL;
+ m->priority.compress[n] = 0;
+
+ /*
+ * List the key exchange algorithms in decreasing order of priority.
+ */
+ n = 0;
+ m->priority.key_xchg[n++] = GNUTLS_KX_DHE_RSA;
+ m->priority.key_xchg[n++] = GNUTLS_KX_RSA;
+ m->priority.key_xchg[n++] = GNUTLS_KX_DHE_DSS;
+ m->priority.key_xchg[n] = 0;
+
+ /*
+ * List message authentication code (MAC) algorithms in decreasing
+ * order of priority to specify via gnutls_mac_set_priority().
+ */
+ n = 0;
+ m->priority.msg_code[n++] = GNUTLS_MAC_SHA1;
+ m->priority.msg_code[n++] = GNUTLS_MAC_MD5;
+ m->priority.msg_code[n] = 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)
+{
+ if (*data != '\0') {
+ int need = (int) strlen(tag) + 2;
+
+ target += strlen(target);
+ if (need < len) {
+ strcat(target, "/");
+ strcat(target, tag);
+ strcat(target, "=");
+ len -= need;
+ target += need;
+ }
+ need = (int) strlen(data);
+ if (need >= len - 1)
+ need = len - 1;
+ strncat(target, data, (size_t) 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)
+{
+ static X509_NAME *result;
+
+ free(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)
+{
+ static X509_NAME *result;
+
+ free(result);
+ if ((result = typeCalloc(X509_NAME)) != 0) {
+ if (ExtractCertificate(cert, result, 0) < 0) {
+ free(result);
+ result = 0;
+ }
+ }
+ return result;
+}
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