+++ /dev/null
-/*
- * Copyright (c) 2007, Cameron Rich
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * * Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * * Neither the name of the axTLS project nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/**
- * Common ssl/tlsv1 code to both the client and server implementations.
- */
-
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include "ssl.h"
-
-/* The session expiry time */
-#define SSL_EXPIRY_TIME (CONFIG_SSL_EXPIRY_TIME*3600)
-
-static const uint8_t g_hello_request[] = { HS_HELLO_REQUEST, 0, 0, 0 };
-static const uint8_t g_chg_cipher_spec_pkt[] = { 1 };
-static const char * server_finished = "server finished";
-static const char * client_finished = "client finished";
-
-static int do_handshake(SSL *ssl, uint8_t *buf, int read_len);
-static void set_key_block(SSL *ssl, int is_write);
-static int verify_digest(SSL *ssl, int mode, const uint8_t *buf, int read_len);
-static void *crypt_new(SSL *ssl, uint8_t *key, uint8_t *iv, int is_decrypt);
-static int send_raw_packet(SSL *ssl, uint8_t protocol);
-
-/**
- * The server will pick the cipher based on the order that the order that the
- * ciphers are listed. This order is defined at compile time.
- */
-#ifdef CONFIG_SSL_SKELETON_MODE
-const uint8_t ssl_prot_prefs[NUM_PROTOCOLS] =
-{ SSL_RC4_128_SHA };
-#else
-static void session_free(SSL_SESSION *ssl_sessions[], int sess_index);
-
-const uint8_t ssl_prot_prefs[NUM_PROTOCOLS] =
-#ifdef CONFIG_SSL_PROT_LOW /* low security, fast speed */
-{ SSL_RC4_128_SHA, SSL_AES128_SHA, SSL_AES256_SHA, SSL_RC4_128_MD5 };
-#elif CONFIG_SSL_PROT_MEDIUM /* medium security, medium speed */
-{ SSL_AES128_SHA, SSL_AES256_SHA, SSL_RC4_128_SHA, SSL_RC4_128_MD5 };
-#else /* CONFIG_SSL_PROT_HIGH */ /* high security, low speed */
-{ SSL_AES256_SHA, SSL_AES128_SHA, SSL_RC4_128_SHA, SSL_RC4_128_MD5 };
-#endif
-#endif /* CONFIG_SSL_SKELETON_MODE */
-
-/**
- * The cipher map containing all the essentials for each cipher.
- */
-#ifdef CONFIG_SSL_SKELETON_MODE
-static const cipher_info_t cipher_info[NUM_PROTOCOLS] =
-{
- { /* RC4-SHA */
- SSL_RC4_128_SHA, /* RC4-SHA */
- 16, /* key size */
- 0, /* iv size */
- 2*(SHA1_SIZE+16), /* key block size */
- 0, /* no padding */
- SHA1_SIZE, /* digest size */
- hmac_sha1, /* hmac algorithm */
- (crypt_func)RC4_crypt, /* encrypt */
- (crypt_func)RC4_crypt /* decrypt */
- },
-};
-#else
-static const cipher_info_t cipher_info[NUM_PROTOCOLS] =
-{
- { /* AES128-SHA */
- SSL_AES128_SHA, /* AES128-SHA */
- 16, /* key size */
- 16, /* iv size */
- 2*(SHA1_SIZE+16+16), /* key block size */
- 16, /* block padding size */
- SHA1_SIZE, /* digest size */
- hmac_sha1, /* hmac algorithm */
- (crypt_func)AES_cbc_encrypt, /* encrypt */
- (crypt_func)AES_cbc_decrypt /* decrypt */
- },
- { /* AES256-SHA */
- SSL_AES256_SHA, /* AES256-SHA */
- 32, /* key size */
- 16, /* iv size */
- 2*(SHA1_SIZE+32+16), /* key block size */
- 16, /* block padding size */
- SHA1_SIZE, /* digest size */
- hmac_sha1, /* hmac algorithm */
- (crypt_func)AES_cbc_encrypt, /* encrypt */
- (crypt_func)AES_cbc_decrypt /* decrypt */
- },
- { /* RC4-SHA */
- SSL_RC4_128_SHA, /* RC4-SHA */
- 16, /* key size */
- 0, /* iv size */
- 2*(SHA1_SIZE+16), /* key block size */
- 0, /* no padding */
- SHA1_SIZE, /* digest size */
- hmac_sha1, /* hmac algorithm */
- (crypt_func)RC4_crypt, /* encrypt */
- (crypt_func)RC4_crypt /* decrypt */
- },
- /*
- * This protocol is from SSLv2 days and is unlikely to be used - but was
- * useful for testing different possible digest algorithms.
- */
- { /* RC4-MD5 */
- SSL_RC4_128_MD5, /* RC4-MD5 */
- 16, /* key size */
- 0, /* iv size */
- 2*(MD5_SIZE+16), /* key block size */
- 0, /* no padding */
- MD5_SIZE, /* digest size */
- hmac_md5, /* hmac algorithm */
- (crypt_func)RC4_crypt, /* encrypt */
- (crypt_func)RC4_crypt /* decrypt */
- },
-};
-#endif
-
-static void prf(const uint8_t *sec, int sec_len, uint8_t *seed, int seed_len,
- uint8_t *out, int olen);
-static const cipher_info_t *get_cipher_info(uint8_t cipher);
-static void increment_read_sequence(SSL *ssl);
-static void increment_write_sequence(SSL *ssl);
-static void add_hmac_digest(SSL *ssl, int snd, uint8_t *hmac_header,
- const uint8_t *buf, int buf_len, uint8_t *hmac_buf);
-
-/* win32 VC6.0 doesn't have variadic macros */
-#if defined(WIN32) && !defined(CONFIG_SSL_FULL_MODE)
-void DISPLAY_BYTES(SSL *ssl, const char *format,
- const uint8_t *data, int size, ...) {}
-#endif
-
-/**
- * Establish a new client/server context.
- */
-EXP_FUNC SSL_CTX *STDCALL ssl_ctx_new(uint32_t options, int num_sessions)
-{
- SSL_CTX *ssl_ctx = (SSL_CTX *)calloc(1, sizeof (SSL_CTX));
- ssl_ctx->options = options;
-
- if (load_key_certs(ssl_ctx) < 0)
- {
- free(ssl_ctx); /* can't load our key/certificate pair, so die */
- return NULL;
- }
-
-#ifndef CONFIG_SSL_SKELETON_MODE
- ssl_ctx->num_sessions = num_sessions;
-#endif
-
- SSL_CTX_MUTEX_INIT(ssl_ctx->mutex);
-
-#ifndef CONFIG_SSL_SKELETON_MODE
- if (num_sessions)
- {
- ssl_ctx->ssl_sessions = (SSL_SESSION **)
- calloc(1, num_sessions*sizeof(SSL_SESSION *));
- }
-#endif
-
- return ssl_ctx;
-}
-
-/*
- * Remove a client/server context.
- */
-EXP_FUNC void STDCALL ssl_ctx_free(SSL_CTX *ssl_ctx)
-{
- SSL *ssl;
- int i;
-
- if (ssl_ctx == NULL)
- return;
-
- ssl = ssl_ctx->head;
-
- /* clear out all the ssl entries */
- while (ssl)
- {
- SSL *next = ssl->next;
- ssl_free(ssl);
- ssl = next;
- }
-
-#ifndef CONFIG_SSL_SKELETON_MODE
- /* clear out all the sessions */
- for (i = 0; i < ssl_ctx->num_sessions; i++)
- session_free(ssl_ctx->ssl_sessions, i);
-
- free(ssl_ctx->ssl_sessions);
-#endif
-
- i = 0;
- while (i < CONFIG_SSL_MAX_CERTS && ssl_ctx->certs[i].buf)
- {
- free(ssl_ctx->certs[i].buf);
- ssl_ctx->certs[i++].buf = NULL;
- }
-
-#ifdef CONFIG_SSL_CERT_VERIFICATION
- remove_ca_certs(ssl_ctx->ca_cert_ctx);
-#endif
- ssl_ctx->chain_length = 0;
- SSL_CTX_MUTEX_DESTROY(ssl_ctx->mutex);
- RSA_free(ssl_ctx->rsa_ctx);
- RNG_terminate();
- free(ssl_ctx);
-}
-
-/*
- * Free any used resources used by this connection.
- */
-EXP_FUNC void STDCALL ssl_free(SSL *ssl)
-{
- SSL_CTX *ssl_ctx;
-
- if (ssl == NULL) /* just ignore null pointers */
- return;
-
- /* spec says we must notify when we are dying */
- send_alert(ssl, SSL_ALERT_CLOSE_NOTIFY);
-
- ssl_ctx = ssl->ssl_ctx;
-
- SSL_CTX_LOCK(ssl_ctx->mutex);
-
- /* adjust the server SSL list */
- if (ssl->prev)
- ssl->prev->next = ssl->next;
- else
- ssl_ctx->head = ssl->next;
-
- if (ssl->next)
- ssl->next->prev = ssl->prev;
- else
- ssl_ctx->tail = ssl->prev;
-
- SSL_CTX_UNLOCK(ssl_ctx->mutex);
-
- /* may already be free - but be sure */
- free(ssl->encrypt_ctx);
- free(ssl->decrypt_ctx);
- disposable_free(ssl);
-#ifdef CONFIG_SSL_CERT_VERIFICATION
- x509_free(ssl->x509_ctx);
-#endif
-
- free(ssl);
-}
-
-/*
- * Read the SSL connection and send any alerts for various errors.
- */
-EXP_FUNC int STDCALL ssl_read(SSL *ssl, uint8_t **in_data)
-{
- int ret = basic_read(ssl, in_data);
-
- /* check for return code so we can send an alert */
- if (ret < SSL_OK)
- {
- if (ret != SSL_ERROR_CONN_LOST)
- {
- send_alert(ssl, ret);
-#ifndef CONFIG_SSL_SKELETON_MODE
- /* something nasty happened, so get rid of this session */
- kill_ssl_session(ssl->ssl_ctx->ssl_sessions, ssl);
-#endif
- }
- }
-
- return ret;
-}
-
-/*
- * Write application data to the client
- */
-EXP_FUNC int STDCALL ssl_write(SSL *ssl, const uint8_t *out_data, int out_len)
-{
- int n = out_len, nw, i, tot = 0;
-
- /* maximum size of a TLS packet is around 16kB, so fragment */
- do
- {
- nw = n;
-
- if (nw > RT_MAX_PLAIN_LENGTH) /* fragment if necessary */
- nw = RT_MAX_PLAIN_LENGTH;
-
- if ((i = send_packet(ssl, PT_APP_PROTOCOL_DATA,
- &out_data[tot], nw)) <= 0)
- {
- out_len = i; /* an error */
- break;
- }
-
- tot += i;
- n -= i;
- } while (n > 0);
-
- return out_len;
-}
-
-/**
- * Add a certificate to the certificate chain.
- */
-int add_cert(SSL_CTX *ssl_ctx, const uint8_t *buf, int len)
-{
- int ret = SSL_ERROR_NO_CERT_DEFINED, i = 0;
- SSL_CERT *ssl_cert;
- X509_CTX *cert = NULL;
- int offset;
-
- while (ssl_ctx->certs[i].buf && i < CONFIG_SSL_MAX_CERTS)
- i++;
-
- if (i == CONFIG_SSL_MAX_CERTS) /* too many certs */
- {
-#ifdef CONFIG_SSL_FULL_MODE
- printf("Error: maximum number of certs added - change of "
- "compile-time configuration required\n");
-#endif
- goto error;
- }
-
- if ((ret = x509_new(buf, &offset, &cert)))
- goto error;
-
-#if defined (CONFIG_SSL_FULL_MODE)
- if (ssl_ctx->options & SSL_DISPLAY_CERTS)
- x509_print(cert, NULL);
-#endif
-
- ssl_cert = &ssl_ctx->certs[i];
- ssl_cert->size = len;
- ssl_cert->buf = (uint8_t *)malloc(len);
- memcpy(ssl_cert->buf, buf, len);
- ssl_ctx->chain_length++;
- len -= offset;
- ret = SSL_OK; /* ok so far */
-
- /* recurse? */
- if (len > 0)
- {
- ret = add_cert(ssl_ctx, &buf[offset], len);
- }
-
-error:
- x509_free(cert); /* don't need anymore */
- return ret;
-}
-
-#ifdef CONFIG_SSL_CERT_VERIFICATION
-/**
- * Add a certificate authority.
- */
-int add_cert_auth(SSL_CTX *ssl_ctx, const uint8_t *buf, int len)
-{
- int ret = SSL_ERROR_NO_CERT_DEFINED;
- int i = 0;
- int offset;
- CA_CERT_CTX *ca_cert_ctx;
-
- if (ssl_ctx->ca_cert_ctx == NULL)
- ssl_ctx->ca_cert_ctx = (CA_CERT_CTX *)calloc(1, sizeof(CA_CERT_CTX));
-
- ca_cert_ctx = ssl_ctx->ca_cert_ctx;
-
- while (i < CONFIG_X509_MAX_CA_CERTS && ca_cert_ctx->cert[i])
- i++;
-
- if (i > CONFIG_X509_MAX_CA_CERTS)
- {
-#ifdef CONFIG_SSL_FULL_MODE
- printf("Error: maximum number of CA certs added - change of "
- "compile-time configuration required\n");
-#endif
- goto error;
- }
-
- if ((ret = x509_new(buf, &offset, &ca_cert_ctx->cert[i])))
- goto error;
-
- len -= offset;
- ret = SSL_OK; /* ok so far */
-
- /* recurse? */
- if (len > 0)
- ret = add_cert_auth(ssl_ctx, &buf[offset], len);
-
-error:
- return ret;
-}
-
-/*
- * Retrieve an X.509 distinguished name component
- */
-EXP_FUNC const char * STDCALL ssl_get_cert_dn(const SSL *ssl, int component)
-{
- if (ssl->x509_ctx == NULL)
- return NULL;
-
- switch (component)
- {
- case SSL_X509_CERT_COMMON_NAME:
- return ssl->x509_ctx->cert_dn[X509_COMMON_NAME];
-
- case SSL_X509_CERT_ORGANIZATION:
- return ssl->x509_ctx->cert_dn[X509_ORGANIZATION];
-
- case SSL_X509_CERT_ORGANIZATIONAL_NAME:
- return ssl->x509_ctx->cert_dn[X509_ORGANIZATIONAL_UNIT];
-
- case SSL_X509_CA_CERT_COMMON_NAME:
- return ssl->x509_ctx->ca_cert_dn[X509_COMMON_NAME];
-
- case SSL_X509_CA_CERT_ORGANIZATION:
- return ssl->x509_ctx->ca_cert_dn[X509_ORGANIZATION];
-
- case SSL_X509_CA_CERT_ORGANIZATIONAL_NAME:
- return ssl->x509_ctx->ca_cert_dn[X509_ORGANIZATIONAL_UNIT];
-
- default:
- return NULL;
- }
-}
-
-#endif
-
-/*
- * Find an ssl object based on the client's file descriptor.
- */
-EXP_FUNC SSL * STDCALL ssl_find(SSL_CTX *ssl_ctx, int client_fd)
-{
- SSL *ssl;
-
- SSL_CTX_LOCK(ssl_ctx->mutex);
- ssl = ssl_ctx->head;
-
- /* search through all the ssl entries */
- while (ssl)
- {
- if (ssl->client_fd == client_fd)
- {
- SSL_CTX_UNLOCK(ssl_ctx->mutex);
- return ssl;
- }
-
- ssl = ssl->next;
- }
-
- SSL_CTX_UNLOCK(ssl_ctx->mutex);
- return NULL;
-}
-
-/*
- * Force the client to perform its handshake again.
- */
-EXP_FUNC int STDCALL ssl_renegotiate(SSL *ssl)
-{
- int ret = SSL_OK;
-
- disposable_new(ssl);
-#ifdef CONFIG_SSL_ENABLE_CLIENT
- if (IS_SET_SSL_FLAG(SSL_IS_CLIENT))
- {
- ret = do_client_connect(ssl);
- }
- else
-#endif
- {
- send_packet(ssl, PT_HANDSHAKE_PROTOCOL,
- g_hello_request, sizeof(g_hello_request));
- SET_SSL_FLAG(SSL_NEED_RECORD);
- }
-
- return ret;
-}
-
-/**
- * @brief Get what we need for key info.
- * @param cipher [in] The cipher information we are after
- * @param key_size [out] The key size for the cipher
- * @param iv_size [out] The iv size for the cipher
- * @return The amount of key information we need.
- */
-static const cipher_info_t *get_cipher_info(uint8_t cipher)
-{
- int i;
-
- for (i = 0; i < NUM_PROTOCOLS; i++)
- {
- if (cipher_info[i].cipher == cipher)
- {
- return &cipher_info[i];
- }
- }
-
- return NULL; /* error */
-}
-
-/*
- * Get a new ssl context for a new connection.
- */
-SSL *ssl_new(SSL_CTX *ssl_ctx, int client_fd)
-{
- SSL *ssl = (SSL *)calloc(1, sizeof(SSL));
- ssl->ssl_ctx = ssl_ctx;
- ssl->need_bytes = SSL_RECORD_SIZE; /* need a record */
- ssl->client_fd = client_fd;
- ssl->flag = SSL_NEED_RECORD;
- ssl->bm_data = ssl->bm_all_data+BM_RECORD_OFFSET; /* space at the start */
- ssl->hs_status = SSL_NOT_OK; /* not connected */
-#ifdef CONFIG_ENABLE_VERIFICATION
- ssl->ca_cert_ctx = ssl_ctx->ca_cert_ctx;
-#endif
- disposable_new(ssl);
-
- /* a bit hacky but saves a few bytes of memory */
- ssl->flag |= ssl_ctx->options;
- SSL_CTX_LOCK(ssl_ctx->mutex);
-
- if (ssl_ctx->head == NULL)
- {
- ssl_ctx->head = ssl;
- ssl_ctx->tail = ssl;
- }
- else
- {
- ssl->prev = ssl_ctx->tail;
- ssl_ctx->tail->next = ssl;
- ssl_ctx->tail = ssl;
- }
-
- SSL_CTX_UNLOCK(ssl_ctx->mutex);
- return ssl;
-}
-
-/*
- * Add a private key to a context.
- */
-int add_private_key(SSL_CTX *ssl_ctx, SSLObjLoader *ssl_obj)
-{
- int ret = SSL_OK;
-
- /* get the private key details */
- if (asn1_get_private_key(ssl_obj->buf, ssl_obj->len, &ssl_ctx->rsa_ctx))
- {
- ret = SSL_ERROR_INVALID_KEY;
- goto error;
- }
-
-error:
- return ret;
-}
-
-/**
- * Increment the read sequence number (as a 64 bit endian indepenent #)
- */
-static void increment_read_sequence(SSL *ssl)
-{
- int i;
-
- for (i = 7; i >= 0; i--)
- {
- if (++ssl->read_sequence[i])
- break;
- }
-}
-
-/**
- * Increment the read sequence number (as a 64 bit endian indepenent #)
- */
-static void increment_write_sequence(SSL *ssl)
-{
- int i;
-
- for (i = 7; i >= 0; i--)
- {
- if (++ssl->write_sequence[i])
- break;
- }
-}
-
-/**
- * Work out the HMAC digest in a packet.
- */
-static void add_hmac_digest(SSL *ssl, int mode, uint8_t *hmac_header,
- const uint8_t *buf, int buf_len, uint8_t *hmac_buf)
-{
- int hmac_len = buf_len + 8 + SSL_RECORD_SIZE;
- uint8_t *t_buf = (uint8_t *)alloca(hmac_len+10);
-
- memcpy(t_buf, (mode == SSL_SERVER_WRITE || mode == SSL_CLIENT_WRITE) ?
- ssl->write_sequence : ssl->read_sequence, 8);
- memcpy(&t_buf[8], hmac_header, SSL_RECORD_SIZE);
- memcpy(&t_buf[8+SSL_RECORD_SIZE], buf, buf_len);
-
- ssl->cipher_info->hmac(t_buf, hmac_len,
- (mode == SSL_SERVER_WRITE || mode == SSL_CLIENT_READ) ?
- ssl->server_mac : ssl->client_mac,
- ssl->cipher_info->digest_size, hmac_buf);
-
-#if 0
- print_blob("record", ssl->hmac_tx, SSL_RECORD_SIZE);
- print_blob("buf", buf, buf_len);
- if (mode == SSL_SERVER_WRITE || mode == SSL_CLIENT_WRITE)
- {
- print_blob("write seq", ssl->write_sequence, 8);
- }
- else
- {
- print_blob("read seq", ssl->read_sequence, 8);
- }
-
- if (mode == SSL_SERVER_WRITE || mode == SSL_CLIENT_READ)
- {
- print_blob("server mac",
- ssl->server_mac, ssl->cipher_info->digest_size);
- }
- else
- {
- print_blob("client mac",
- ssl->client_mac, ssl->cipher_info->digest_size);
- }
- print_blob("hmac", hmac_buf, SHA1_SIZE);
-#endif
-}
-
-/**
- * Verify that the digest of a packet is correct.
- */
-static int verify_digest(SSL *ssl, int mode, const uint8_t *buf, int read_len)
-{
- uint8_t hmac_buf[SHA1_SIZE];
- int hmac_offset;
-
- if (ssl->cipher_info->padding_size)
- {
- hmac_offset = read_len-buf[read_len-1]-ssl->cipher_info->digest_size-1;
- }
- else
- {
- hmac_offset = read_len - ssl->cipher_info->digest_size;
- }
-
- /* sanity check the offset */
- if (hmac_offset < 0)
- {
- return SSL_ERROR_INVALID_HMAC;
- }
-
- ssl->hmac_header[3] = hmac_offset >> 8; /* insert size */
- ssl->hmac_header[4] = hmac_offset & 0xff;
- add_hmac_digest(ssl, mode, ssl->hmac_header, buf, hmac_offset, hmac_buf);
-
- if (memcmp(hmac_buf, &buf[hmac_offset], ssl->cipher_info->digest_size))
- {
- return SSL_ERROR_INVALID_HMAC;
- }
-
- return hmac_offset;
-}
-
-/**
- * Add a packet to the end of our sent and received packets, so that we may use
- * it to calculate the hash at the end.
- */
-void add_packet(SSL *ssl, const uint8_t *pkt, int len)
-{
- MD5_Update(&ssl->dc->md5_ctx, pkt, len);
- SHA1_Update(&ssl->dc->sha1_ctx, pkt, len);
-}
-
-/**
- * Work out the MD5 PRF.
- */
-static void p_hash_md5(const uint8_t *sec, int sec_len,
- uint8_t *seed, int seed_len, uint8_t *out, int olen)
-{
- uint8_t a1[128];
-
- /* A(1) */
- hmac_md5(seed, seed_len, sec, sec_len, a1);
- memcpy(&a1[MD5_SIZE], seed, seed_len);
- hmac_md5(a1, MD5_SIZE+seed_len, sec, sec_len, out);
-
- while (olen > MD5_SIZE)
- {
- uint8_t a2[MD5_SIZE];
- out += MD5_SIZE;
- olen -= MD5_SIZE;
-
- /* A(N) */
- hmac_md5(a1, MD5_SIZE, sec, sec_len, a2);
- memcpy(a1, a2, MD5_SIZE);
-
- /* work out the actual hash */
- hmac_md5(a1, MD5_SIZE+seed_len, sec, sec_len, out);
- }
-}
-
-/**
- * Work out the SHA1 PRF.
- */
-static void p_hash_sha1(const uint8_t *sec, int sec_len,
- uint8_t *seed, int seed_len, uint8_t *out, int olen)
-{
- uint8_t a1[128];
-
- /* A(1) */
- hmac_sha1(seed, seed_len, sec, sec_len, a1);
- memcpy(&a1[SHA1_SIZE], seed, seed_len);
- hmac_sha1(a1, SHA1_SIZE+seed_len, sec, sec_len, out);
-
- while (olen > SHA1_SIZE)
- {
- uint8_t a2[SHA1_SIZE];
- out += SHA1_SIZE;
- olen -= SHA1_SIZE;
-
- /* A(N) */
- hmac_sha1(a1, SHA1_SIZE, sec, sec_len, a2);
- memcpy(a1, a2, SHA1_SIZE);
-
- /* work out the actual hash */
- hmac_sha1(a1, SHA1_SIZE+seed_len, sec, sec_len, out);
- }
-}
-
-/**
- * Work out the PRF.
- */
-static void prf(const uint8_t *sec, int sec_len, uint8_t *seed, int seed_len,
- uint8_t *out, int olen)
-{
- int len, i;
- const uint8_t *S1, *S2;
- uint8_t xbuf[256]; /* needs to be > the amount of key data */
- uint8_t ybuf[256]; /* needs to be > the amount of key data */
-
- len = sec_len/2;
- S1 = sec;
- S2 = &sec[len];
- len += (sec_len & 1); /* add for odd, make longer */
-
- p_hash_md5(S1, len, seed, seed_len, xbuf, olen);
- p_hash_sha1(S2, len, seed, seed_len, ybuf, olen);
-
- for (i = 0; i < olen; i++)
- out[i] = xbuf[i] ^ ybuf[i];
-}
-
-/**
- * Generate a master secret based on the client/server random data and the
- * premaster secret.
- */
-void generate_master_secret(SSL *ssl, const uint8_t *premaster_secret)
-{
- uint8_t buf[128]; /* needs to be > 13+32+32 in size */
- strcpy((char *)buf, "master secret");
- memcpy(&buf[13], ssl->dc->client_random, SSL_RANDOM_SIZE);
- memcpy(&buf[45], ssl->dc->server_random, SSL_RANDOM_SIZE);
- prf(premaster_secret, SSL_SECRET_SIZE, buf, 77, ssl->dc->master_secret,
- SSL_SECRET_SIZE);
-}
-
-/**
- * Generate a 'random' blob of data used for the generation of keys.
- */
-static void generate_key_block(uint8_t *client_random, uint8_t *server_random,
- uint8_t *master_secret, uint8_t *key_block, int key_block_size)
-{
- uint8_t buf[128];
- strcpy((char *)buf, "key expansion");
- memcpy(&buf[13], server_random, SSL_RANDOM_SIZE);
- memcpy(&buf[45], client_random, SSL_RANDOM_SIZE);
- prf(master_secret, SSL_SECRET_SIZE, buf, 77, key_block, key_block_size);
-}
-
-/**
- * Calculate the digest used in the finished message. This function also
- * doubles up as a certificate verify function.
- */
-void finished_digest(SSL *ssl, const char *label, uint8_t *digest)
-{
- uint8_t mac_buf[128];
- uint8_t *q = mac_buf;
- MD5_CTX md5_ctx = ssl->dc->md5_ctx;
- SHA1_CTX sha1_ctx = ssl->dc->sha1_ctx;
-
- if (label)
- {
- strcpy((char *)q, label);
- q += strlen(label);
- }
-
- MD5_Final(q, &md5_ctx);
- q += MD5_SIZE;
-
- SHA1_Final(q, &sha1_ctx);
- q += SHA1_SIZE;
-
- if (label)
- {
- prf(ssl->dc->master_secret, SSL_SECRET_SIZE, mac_buf, (int)(q-mac_buf),
- digest, SSL_FINISHED_HASH_SIZE);
- }
- else /* for use in a certificate verify */
- {
- memcpy(digest, mac_buf, MD5_SIZE + SHA1_SIZE);
- }
-
-#if 0
- printf("label: %s\n", label);
- print_blob("master secret", ssl->dc->master_secret, 48);
- print_blob("mac_buf", mac_buf, q-mac_buf);
- print_blob("finished digest", digest, SSL_FINISHED_HASH_SIZE);
-#endif
-}
-
-/**
- * Retrieve (and initialise) the context of a cipher.
- */
-static void *crypt_new(SSL *ssl, uint8_t *key, uint8_t *iv, int is_decrypt)
-{
- switch (ssl->cipher)
- {
-#ifndef CONFIG_SSL_SKELETON_MODE
- case SSL_AES128_SHA:
- {
- AES_CTX *aes_ctx = (AES_CTX *)malloc(sizeof(AES_CTX));
- AES_set_key(aes_ctx, key, iv, AES_MODE_128);
-
- if (is_decrypt)
- {
- AES_convert_key(aes_ctx);
- }
-
- return (void *)aes_ctx;
- }
-
- case SSL_AES256_SHA:
- {
- AES_CTX *aes_ctx = (AES_CTX *)malloc(sizeof(AES_CTX));
- AES_set_key(aes_ctx, key, iv, AES_MODE_256);
-
- if (is_decrypt)
- {
- AES_convert_key(aes_ctx);
- }
-
- return (void *)aes_ctx;
- }
- break;
-
- case SSL_RC4_128_MD5:
-#endif
- case SSL_RC4_128_SHA:
- {
- RC4_CTX *rc4_ctx = (RC4_CTX *)malloc(sizeof(RC4_CTX));
- RC4_setup(rc4_ctx, key, 16);
- return (void *)rc4_ctx;
- }
- break;
- }
-
- return NULL; /* its all gone wrong */
-}
-
-/**
- * Send a packet over the socket.
- */
-static int send_raw_packet(SSL *ssl, uint8_t protocol)
-{
- uint8_t *rec_buf = ssl->bm_all_data;
- int pkt_size = SSL_RECORD_SIZE+ssl->bm_index;
- int sent = 0;
- int ret = SSL_OK;
-
- rec_buf[0] = protocol;
- rec_buf[1] = 0x03; /* version = 3.1 (TLS) */
- rec_buf[2] = 0x01;
- rec_buf[3] = ssl->bm_index >> 8;
- rec_buf[4] = ssl->bm_index & 0xff;
-
- DISPLAY_BYTES(ssl, "sending %d bytes", ssl->bm_all_data,
- pkt_size, pkt_size);
-
- while (sent < pkt_size)
- {
- if ((ret = SOCKET_WRITE(ssl->client_fd,
- &ssl->bm_all_data[sent], pkt_size)) < 0)
- {
- ret = SSL_ERROR_CONN_LOST;
- break;
- }
-
- sent += ret;
-
- /* keep going until the write buffer has some space */
- if (sent != pkt_size)
- {
- fd_set wfds;
- FD_ZERO(&wfds);
- FD_SET(ssl->client_fd, &wfds);
-
- if (select(ssl->client_fd + 1, NULL, &wfds, NULL, NULL) < 0)
- {
- ret = SSL_ERROR_CONN_LOST;
- break;
- }
- }
- }
-
- SET_SSL_FLAG(SSL_NEED_RECORD); /* reset for next time */
- ssl->bm_index = 0;
-
- if (protocol != PT_APP_PROTOCOL_DATA)
- {
- /* always return SSL_OK during handshake */
- ret = SSL_OK;
- }
-
- return ret;
-}
-
-/**
- * Send an encrypted packet with padding bytes if necessary.
- */
-int send_packet(SSL *ssl, uint8_t protocol, const uint8_t *in, int length)
-{
- int msg_length = length;
- int ret, pad_bytes = 0;
- ssl->bm_index = msg_length;
-
- /* if our state is bad, don't bother */
- if (ssl->hs_status == SSL_ERROR_DEAD)
- return SSL_ERROR_CONN_LOST;
-
- if (in) /* has the buffer already been initialised? */
- {
- memcpy(ssl->bm_data, in, length);
- }
-
- if (IS_SET_SSL_FLAG(SSL_TX_ENCRYPTED))
- {
- int mode = IS_SET_SSL_FLAG(SSL_IS_CLIENT) ?
- SSL_CLIENT_WRITE : SSL_SERVER_WRITE;
- uint8_t hmac_header[SSL_RECORD_SIZE];
-
- hmac_header[0] = protocol;
- hmac_header[1] = 0x03;
- hmac_header[2] = 0x01;
- hmac_header[3] = length >> 8;
- hmac_header[4] = length & 0xff;
-
- if (protocol == PT_HANDSHAKE_PROTOCOL)
- {
- DISPLAY_STATE(ssl, 1, ssl->bm_data[0], 0);
-
- if (ssl->bm_data[0] != HS_HELLO_REQUEST)
- {
- add_packet(ssl, ssl->bm_data, ssl->bm_index);
- }
- }
-
- /* add the packet digest */
- msg_length += ssl->cipher_info->digest_size;
- ssl->bm_index = msg_length;
- add_hmac_digest(ssl, mode, hmac_header, ssl->bm_data, length,
- &ssl->bm_data[length]);
-
- /* add padding? */
- if (ssl->cipher_info->padding_size)
- {
- int last_blk_size = msg_length%ssl->cipher_info->padding_size;
- pad_bytes = ssl->cipher_info->padding_size - last_blk_size;
-
- /* ensure we always have at least 1 padding byte */
- if (pad_bytes == 0)
- pad_bytes += ssl->cipher_info->padding_size;
-
- memset(&ssl->bm_data[msg_length], pad_bytes-1, pad_bytes);
- msg_length += pad_bytes;
- ssl->bm_index = msg_length;
- }
-
- DISPLAY_BYTES(ssl, "unencrypted write", ssl->bm_data, msg_length);
- increment_write_sequence(ssl);
-
- /* now encrypt the packet */
- ssl->cipher_info->encrypt(ssl->encrypt_ctx, ssl->bm_data,
- ssl->bm_data, msg_length);
- }
- else if (protocol == PT_HANDSHAKE_PROTOCOL)
- {
- DISPLAY_STATE(ssl, 1, ssl->bm_data[0], 0);
-
- if (ssl->bm_data[0] != HS_HELLO_REQUEST)
- {
- add_packet(ssl, ssl->bm_data, ssl->bm_index);
- }
- }
-
- if ((ret = send_raw_packet(ssl, protocol)) <= 0)
- return ret;
-
- return length; /* just return what we wanted to send */
-}
-
-/**
- * Work out the cipher keys we are going to use for this session based on the
- * master secret.
- */
-static void set_key_block(SSL *ssl, int is_write)
-{
- const cipher_info_t *ciph_info = get_cipher_info(ssl->cipher);
- uint8_t *q;
- uint8_t client_key[32], server_key[32]; /* big enough for AES256 */
- uint8_t client_iv[16], server_iv[16]; /* big enough for AES128/256 */
- int is_client = IS_SET_SSL_FLAG(SSL_IS_CLIENT);
-
- /* only do once in a handshake */
- if (ssl->dc->key_block == NULL)
- {
- ssl->dc->key_block = (uint8_t *)malloc(ciph_info->key_block_size);
-
-#if 0
- print_blob("client", ssl->dc->client_random, 32);
- print_blob("server", ssl->dc->server_random, 32);
- print_blob("master", ssl->dc->master_secret, SSL_SECRET_SIZE);
-#endif
- generate_key_block(ssl->dc->client_random, ssl->dc->server_random,
- ssl->dc->master_secret, ssl->dc->key_block,
- ciph_info->key_block_size);
-#if 0
- print_blob("keyblock", ssl->key_block, ciph_info->key_block_size);
-#endif
- }
-
- q = ssl->dc->key_block;
-
- if ((is_client && is_write) || (!is_client && !is_write))
- {
- memcpy(ssl->client_mac, q, ciph_info->digest_size);
- }
-
- q += ciph_info->digest_size;
-
- if ((!is_client && is_write) || (is_client && !is_write))
- {
- memcpy(ssl->server_mac, q, ciph_info->digest_size);
- }
-
- q += ciph_info->digest_size;
- memcpy(client_key, q, ciph_info->key_size);
- q += ciph_info->key_size;
- memcpy(server_key, q, ciph_info->key_size);
- q += ciph_info->key_size;
-
-#ifndef CONFIG_SSL_SKELETON_MODE
- if (ciph_info->iv_size) /* RC4 has no IV, AES does */
- {
- memcpy(client_iv, q, ciph_info->iv_size);
- q += ciph_info->iv_size;
- memcpy(server_iv, q, ciph_info->iv_size);
- q += ciph_info->iv_size;
- }
-#endif
-
- free(is_write ? ssl->encrypt_ctx : ssl->decrypt_ctx);
-
- /* now initialise the ciphers */
- if (is_client)
- {
- finished_digest(ssl, server_finished, ssl->dc->final_finish_mac);
-
- if (is_write)
- ssl->encrypt_ctx = crypt_new(ssl, client_key, client_iv, 0);
- else
- ssl->decrypt_ctx = crypt_new(ssl, server_key, server_iv, 1);
- }
- else
- {
- finished_digest(ssl, client_finished, ssl->dc->final_finish_mac);
-
- if (is_write)
- ssl->encrypt_ctx = crypt_new(ssl, server_key, server_iv, 0);
- else
- ssl->decrypt_ctx = crypt_new(ssl, client_key, client_iv, 1);
- }
-
- ssl->cipher_info = ciph_info;
-}
-
-/**
- * Read the SSL connection.
- */
-int basic_read(SSL *ssl, uint8_t **in_data)
-{
- int ret = SSL_OK;
- int read_len, is_client = IS_SET_SSL_FLAG(SSL_IS_CLIENT);
- uint8_t *buf = ssl->bm_data;
-
- read_len = SOCKET_READ(ssl->client_fd, &buf[ssl->bm_read_index],
- ssl->need_bytes-ssl->got_bytes);
-
- /* connection has gone, so die */
- if (read_len <= 0)
- {
- ret = SSL_ERROR_CONN_LOST;
- ssl->hs_status = SSL_ERROR_DEAD; /* make sure it stays dead */
- goto error;
- }
-
- DISPLAY_BYTES(ssl, "received %d bytes",
- &ssl->bm_data[ssl->bm_read_index], read_len, read_len);
-
- ssl->got_bytes += read_len;
- ssl->bm_read_index += read_len;
-
- /* haven't quite got what we want, so try again later */
- if (ssl->got_bytes < ssl->need_bytes)
- return SSL_OK;
-
- read_len = ssl->got_bytes;
- ssl->got_bytes = 0;
-
- if (IS_SET_SSL_FLAG(SSL_NEED_RECORD))
- {
- /* check for sslv2 "client hello" */
- if (buf[0] & 0x80 && buf[2] == 1 && buf[3] == 0x03)
- {
-#ifdef CONFIG_SSL_ENABLE_V23_HANDSHAKE
- DISPLAY_BYTES(ssl, "ssl2 record", buf, 5);
- add_packet(ssl, &buf[2], 3);
- ret = process_sslv23_client_hello(ssl);
-#else
- printf("Error: no SSLv23 handshaking allowed\n"); TTY_FLUSH();
- ret = SSL_ERROR_NOT_SUPPORTED;
-#endif
- goto error; /* not an error - just get out of here */
- }
-
- ssl->need_bytes = (buf[3] << 8) + buf[4];
-
- /* do we violate the spec with the message size? */
- if (ssl->need_bytes > RT_MAX_PLAIN_LENGTH+RT_EXTRA-BM_RECORD_OFFSET)
- {
- ret = SSL_ERROR_INVALID_PROT_MSG;
- goto error;
- }
-
- CLR_SSL_FLAG(SSL_NEED_RECORD);
- memcpy(ssl->hmac_header, buf, 3); /* store for hmac */
- ssl->record_type = buf[0];
- goto error; /* no error, we're done */
- }
-
- /* for next time - just do it now in case of an error */
- SET_SSL_FLAG(SSL_NEED_RECORD);
- ssl->need_bytes = SSL_RECORD_SIZE;
-
- /* decrypt if we need to */
- if (IS_SET_SSL_FLAG(SSL_RX_ENCRYPTED))
- {
- ssl->cipher_info->decrypt(ssl->decrypt_ctx, buf, buf, read_len);
- read_len = verify_digest(ssl,
- is_client ? SSL_CLIENT_READ : SSL_SERVER_READ, buf, read_len);
-
- /* does the hmac work? */
- if (read_len < 0)
- {
- ret = read_len;
- goto error;
- }
-
- DISPLAY_BYTES(ssl, "decrypted", buf, read_len);
- increment_read_sequence(ssl);
- }
-
- /* The main part of the SSL packet */
- switch (ssl->record_type)
- {
- case PT_HANDSHAKE_PROTOCOL:
- ssl->dc->bm_proc_index = 0;
- ret = do_handshake(ssl, buf, read_len);
- break;
-
- case PT_CHANGE_CIPHER_SPEC:
- if (ssl->next_state != HS_FINISHED)
- {
- ret = SSL_ERROR_INVALID_HANDSHAKE;
- goto error;
- }
-
- /* all encrypted from now on */
- SET_SSL_FLAG(SSL_RX_ENCRYPTED);
- set_key_block(ssl, 0);
- memset(ssl->read_sequence, 0, 8);
- break;
-
- case PT_APP_PROTOCOL_DATA:
- if (in_data)
- {
- *in_data = ssl->bm_data; /* point to the work buffer */
- (*in_data)[read_len] = 0; /* null terminate just in case */
- }
-
- ret = read_len;
- break;
-
- case PT_ALERT_PROTOCOL:
- /* return the alert # with alert bit set */
- ret = -buf[1];
- DISPLAY_ALERT(ssl, buf[1]);
- break;
-
- default:
- ret = SSL_ERROR_INVALID_PROT_MSG;
- break;
- }
-
-error:
- ssl->bm_read_index = 0; /* reset to go again */
-
- if (ret < SSL_OK && in_data)/* if all wrong, then clear this buffer ptr */
- *in_data = NULL;
-
- return ret;
-}
-
-/**
- * Do some basic checking of data and then perform the appropriate handshaking.
- */
-static int do_handshake(SSL *ssl, uint8_t *buf, int read_len)
-{
- int hs_len = (buf[2]<<8) + buf[3];
- uint8_t handshake_type = buf[0];
- int ret = SSL_OK;
- int is_client = IS_SET_SSL_FLAG(SSL_IS_CLIENT);
-
- /* some integrity checking on the handshake */
- PARANOIA_CHECK(read_len-SSL_HS_HDR_SIZE, hs_len);
-
- if (handshake_type != ssl->next_state)
- {
- /* handle a special case on the client */
- if (!is_client || handshake_type != HS_CERT_REQ ||
- ssl->next_state != HS_SERVER_HELLO_DONE)
- {
- ret = SSL_ERROR_INVALID_HANDSHAKE;
- goto error;
- }
- }
-
- hs_len += SSL_HS_HDR_SIZE; /* adjust for when adding packets */
- ssl->bm_index = hs_len; /* store the size and check later */
- DISPLAY_STATE(ssl, 0, handshake_type, 0);
-
- if (handshake_type != HS_CERT_VERIFY && handshake_type != HS_HELLO_REQUEST)
- add_packet(ssl, buf, hs_len);
-
-#if defined(CONFIG_SSL_ENABLE_CLIENT)
- ret = is_client ?
- do_clnt_handshake(ssl, handshake_type, buf, hs_len) :
- do_svr_handshake(ssl, handshake_type, buf, hs_len);
-#else
- ret = do_svr_handshake(ssl, handshake_type, buf, hs_len);
-#endif
-
- /* just use recursion to get the rest */
- if (hs_len < read_len && ret == SSL_OK)
- ret = do_handshake(ssl, &buf[hs_len], read_len-hs_len);
-
-error:
- return ret;
-}
-
-/**
- * Sends the change cipher spec message. We have just read a finished message
- * from the client.
- */
-int send_change_cipher_spec(SSL *ssl)
-{
- int ret = send_packet(ssl, PT_CHANGE_CIPHER_SPEC,
- g_chg_cipher_spec_pkt, sizeof(g_chg_cipher_spec_pkt));
- SET_SSL_FLAG(SSL_TX_ENCRYPTED);
- set_key_block(ssl, 1);
- memset(ssl->write_sequence, 0, 8);
- return ret;
-}
-
-/**
- * Send a "finished" message
- */
-int send_finished(SSL *ssl)
-{
- uint8_t *buf = ssl->bm_data;
-
- buf[0] = HS_FINISHED;
- buf[1] = 0;
- buf[2] = 0;
- buf[3] = SSL_FINISHED_HASH_SIZE;
-
- /* now add the finished digest mac (12 bytes) */
- finished_digest(ssl,
- IS_SET_SSL_FLAG(SSL_IS_CLIENT) ?
- client_finished : server_finished, &buf[4]);
-
-#ifndef CONFIG_SSL_SKELETON_MODE
- /* store in the session cache */
- if (!IS_SET_SSL_FLAG(SSL_SESSION_RESUME) && ssl->ssl_ctx->num_sessions)
- {
- memcpy(ssl->session->master_secret,
- ssl->dc->master_secret, SSL_SECRET_SIZE);
- }
-#endif
-
- return send_packet(ssl, PT_HANDSHAKE_PROTOCOL,
- NULL, SSL_FINISHED_HASH_SIZE+4);
-}
-
-/**
- * Send an alert message.
- * Return 1 if the alert was an "error".
- */
-int send_alert(SSL *ssl, int error_code)
-{
- int alert_num = 0;
- int is_warning = 0;
- uint8_t buf[2];
-
- /* Don't bother we're already dead */
- if (ssl->hs_status == SSL_ERROR_DEAD)
- {
- return SSL_ERROR_CONN_LOST;
- }
-
-#ifdef CONFIG_SSL_FULL_MODE
- if (IS_SET_SSL_FLAG(SSL_DISPLAY_STATES))
- ssl_display_error(error_code);
-#endif
-
- switch (error_code)
- {
- case SSL_ALERT_CLOSE_NOTIFY:
- is_warning = 1;
- alert_num = SSL_ALERT_CLOSE_NOTIFY;
- break;
-
- case SSL_ERROR_CONN_LOST: /* don't send alert just yet */
- is_warning = 1;
- break;
-
- case SSL_ERROR_INVALID_HANDSHAKE:
- case SSL_ERROR_INVALID_PROT_MSG:
- alert_num = SSL_ALERT_HANDSHAKE_FAILURE;
- break;
-
- case SSL_ERROR_INVALID_HMAC:
- case SSL_ERROR_FINISHED_INVALID:
- alert_num = SSL_ALERT_BAD_RECORD_MAC;
- break;
-
- case SSL_ERROR_INVALID_VERSION:
- alert_num = SSL_ALERT_INVALID_VERSION;
- break;
-
- case SSL_ERROR_INVALID_SESSION:
- case SSL_ERROR_NO_CIPHER:
- case SSL_ERROR_INVALID_KEY:
- alert_num = SSL_ALERT_ILLEGAL_PARAMETER;
- break;
-
- case SSL_ERROR_BAD_CERTIFICATE:
- alert_num = SSL_ALERT_BAD_CERTIFICATE;
- break;
-
- default:
- /* a catch-all for any badly verified certificates */
- alert_num = (error_code <= SSL_X509_OFFSET) ?
- SSL_ALERT_BAD_CERTIFICATE : SSL_ALERT_UNEXPECTED_MESSAGE;
- break;
- }
-
- buf[0] = is_warning ? 1 : 2;
- buf[1] = alert_num;
- send_packet(ssl, PT_ALERT_PROTOCOL, buf, sizeof(buf));
- DISPLAY_ALERT(ssl, alert_num);
- return is_warning ? 0 : 1;
-}
-
-/**
- * Process a client finished message.
- */
-int process_finished(SSL *ssl, int hs_len)
-{
- uint8_t *buf = ssl->bm_data;
- int ret = SSL_OK;
- int is_client = IS_SET_SSL_FLAG(SSL_IS_CLIENT);
- int resume = IS_SET_SSL_FLAG(SSL_SESSION_RESUME);
-
- PARANOIA_CHECK(ssl->bm_index, SSL_FINISHED_HASH_SIZE+4);
-
- /* check that we all work before we continue */
- if (memcmp(ssl->dc->final_finish_mac, &buf[4], SSL_FINISHED_HASH_SIZE))
- return SSL_ERROR_FINISHED_INVALID;
-
- if ((!is_client && !resume) || (is_client && resume))
- {
- if ((ret = send_change_cipher_spec(ssl)) == SSL_OK)
- ret = send_finished(ssl);
- }
-
- /* if we ever renegotiate */
- ssl->next_state = is_client ? HS_HELLO_REQUEST : HS_CLIENT_HELLO;
- ssl->hs_status = ret; /* set the final handshake status */
-
-error:
- return ret;
-}
-
-/**
- * Send a certificate.
- */
-int send_certificate(SSL *ssl)
-{
- int i = 0;
- uint8_t *buf = ssl->bm_data;
- int offset = 7;
- int chain_length;
-
- buf[0] = HS_CERTIFICATE;
- buf[1] = 0;
- buf[4] = 0;
-
- while (i < ssl->ssl_ctx->chain_length)
- {
- SSL_CERT *cert = &ssl->ssl_ctx->certs[i];
- buf[offset++] = 0;
- buf[offset++] = cert->size >> 8; /* cert 1 length */
- buf[offset++] = cert->size & 0xff;
- memcpy(&buf[offset], cert->buf, cert->size);
- offset += cert->size;
- i++;
- }
-
- chain_length = offset - 7;
- buf[5] = chain_length >> 8; /* cert chain length */
- buf[6] = chain_length & 0xff;
- chain_length += 3;
- buf[2] = chain_length >> 8; /* handshake length */
- buf[3] = chain_length & 0xff;
- ssl->bm_index = offset;
- return send_packet(ssl, PT_HANDSHAKE_PROTOCOL, NULL, offset);
-}
-
-/**
- * Create a blob of memory that we'll get rid of once the handshake is
- * complete.
- */
-void disposable_new(SSL *ssl)
-{
- if (ssl->dc == NULL)
- {
- ssl->dc = (DISPOSABLE_CTX *)calloc(1, sizeof(DISPOSABLE_CTX));
- MD5_Init(&ssl->dc->md5_ctx);
- SHA1_Init(&ssl->dc->sha1_ctx);
- }
-}
-
-/**
- * Remove the temporary blob of memory.
- */
-void disposable_free(SSL *ssl)
-{
- if (ssl->dc)
- {
- free(ssl->dc->key_block);
- memset(ssl->dc, 0, sizeof(DISPOSABLE_CTX));
- free(ssl->dc);
- ssl->dc = NULL;
- }
-
-}
-
-#ifndef CONFIG_SSL_SKELETON_MODE /* no session resumption in this mode */
-/**
- * Find if an existing session has the same session id. If so, use the
- * master secret from this session for session resumption.
- */
-SSL_SESSION *ssl_session_update(int max_sessions, SSL_SESSION *ssl_sessions[],
- SSL *ssl, const uint8_t *session_id)
-{
- time_t tm = time(NULL);
- time_t oldest_sess_time = tm;
- SSL_SESSION *oldest_sess = NULL;
- int i;
-
- /* no sessions? Then bail */
- if (max_sessions == 0)
- return NULL;
-
- SSL_CTX_LOCK(ssl->ssl_ctx->mutex);
- if (session_id)
- {
- for (i = 0; i < max_sessions; i++)
- {
- if (ssl_sessions[i])
- {
- /* kill off any expired sessions */
- if (tm > ssl_sessions[i]->conn_time + SSL_EXPIRY_TIME)
- {
- session_free(ssl_sessions, i);
- continue;
- }
-
- /* if the session id matches, it must still be less than
- the expiry time */
- if (memcmp(ssl_sessions[i]->session_id, session_id,
- SSL_SESSION_ID_SIZE) == 0)
- {
- ssl->session_index = i;
- memcpy(ssl->dc->master_secret,
- ssl_sessions[i]->master_secret, SSL_SECRET_SIZE);
- SET_SSL_FLAG(SSL_SESSION_RESUME);
- SSL_CTX_UNLOCK(ssl->ssl_ctx->mutex);
- return ssl_sessions[i]; /* a session was found */
- }
- }
- }
- }
-
- /* If we've got here, no matching session was found - so create one */
- for (i = 0; i < max_sessions; i++)
- {
- if (ssl_sessions[i] == NULL)
- {
- /* perfect, this will do */
- ssl_sessions[i] = (SSL_SESSION *)calloc(1, sizeof(SSL_SESSION));
- ssl_sessions[i]->conn_time = tm;
- ssl->session_index = i;
- SSL_CTX_UNLOCK(ssl->ssl_ctx->mutex);
- return ssl_sessions[i]; /* return the session object */
- }
- else if (ssl_sessions[i]->conn_time <= oldest_sess_time)
- {
- /* find the oldest session */
- oldest_sess_time = ssl_sessions[i]->conn_time;
- oldest_sess = ssl_sessions[i];
- ssl->session_index = i;
- }
- }
-
- /* ok, we've used up all of our sessions. So blow the oldest session away */
- oldest_sess->conn_time = tm;
- memset(oldest_sess->session_id, 0, sizeof(SSL_SESSION_ID_SIZE));
- memset(oldest_sess->master_secret, 0, sizeof(SSL_SECRET_SIZE));
- SSL_CTX_UNLOCK(ssl->ssl_ctx->mutex);
- return oldest_sess;
-}
-
-/**
- * Free an existing session.
- */
-static void session_free(SSL_SESSION *ssl_sessions[], int sess_index)
-{
- if (ssl_sessions[sess_index])
- {
- free(ssl_sessions[sess_index]);
- ssl_sessions[sess_index] = NULL;
- }
-}
-
-/**
- * This ssl object doesn't want this session anymore.
- */
-void kill_ssl_session(SSL_SESSION **ssl_sessions, SSL *ssl)
-{
- SSL_CTX_LOCK(ssl->ssl_ctx->mutex);
-
- if (ssl->ssl_ctx->num_sessions)
- {
- session_free(ssl_sessions, ssl->session_index);
- ssl->session = NULL;
- }
-
- SSL_CTX_UNLOCK(ssl->ssl_ctx->mutex);
-}
-#endif /* CONFIG_SSL_SKELETON_MODE */
-
-/*
- * Get the session id for a handshake. This will be a 32 byte sequence.
- */
-EXP_FUNC const uint8_t * STDCALL ssl_get_session_id(const SSL *ssl)
-{
- return ssl->session_id;
-}
-
-/*
- * Get the session id size for a handshake.
- */
-EXP_FUNC uint8_t STDCALL ssl_get_session_id_size(const SSL *ssl)
-{
- return ssl->sess_id_size;
-}
-
-/*
- * Return the cipher id (in the SSL form).
- */
-EXP_FUNC uint8_t STDCALL ssl_get_cipher_id(const SSL *ssl)
-{
- return ssl->cipher;
-}
-
-/*
- * Return the status of the handshake.
- */
-EXP_FUNC int STDCALL ssl_handshake_status(const SSL *ssl)
-{
- return ssl->hs_status;
-}
-
-/*
- * Retrieve various parameters about the SSL engine.
- */
-EXP_FUNC int STDCALL ssl_get_config(int offset)
-{
- switch (offset)
- {
- /* return the appropriate build mode */
- case SSL_BUILD_MODE:
-#if defined(CONFIG_SSL_FULL_MODE)
- return SSL_BUILD_FULL_MODE;
-#elif defined(CONFIG_SSL_ENABLE_CLIENT)
- return SSL_BUILD_ENABLE_CLIENT;
-#elif defined(CONFIG_ENABLE_VERIFICATION)
- return SSL_BUILD_ENABLE_VERIFICATION;
-#elif defined(CONFIG_SSL_SERVER_ONLY )
- return SSL_BUILD_SERVER_ONLY;
-#else
- return SSL_BUILD_SKELETON_MODE;
-#endif
-
- case SSL_MAX_CERT_CFG_OFFSET:
- return CONFIG_SSL_MAX_CERTS;
-
-#ifdef CONFIG_SSL_CERT_VERIFICATION
- case SSL_MAX_CA_CERT_CFG_OFFSET:
- return CONFIG_X509_MAX_CA_CERTS;
-#endif
-#ifdef CONFIG_SSL_HAS_PEM
- case SSL_HAS_PEM:
- return 1;
-#endif
- default:
- return 0;
- }
-}
-
-#ifdef CONFIG_SSL_CERT_VERIFICATION
-/**
- * Authenticate a received certificate.
- */
-EXP_FUNC int STDCALL ssl_verify_cert(const SSL *ssl)
-{
- int ret;
- SSL_CTX_LOCK(ssl->ssl_ctx->mutex);
- ret = x509_verify(ssl->ssl_ctx->ca_cert_ctx, ssl->x509_ctx);
- SSL_CTX_UNLOCK(ssl->ssl_ctx->mutex);
-
- if (ret) /* modify into an SSL error type */
- {
- ret = SSL_X509_ERROR(ret);
- }
-
- return ret;
-}
-
-/**
- * Process a certificate message.
- */
-int process_certificate(SSL *ssl, X509_CTX **x509_ctx)
-{
- int ret = SSL_OK;
- uint8_t *buf = &ssl->bm_data[ssl->dc->bm_proc_index];
- int pkt_size = ssl->bm_index;
- int cert_size, offset = 5;
- int total_cert_size = (buf[offset]<<8) + buf[offset+1];
- int is_client = IS_SET_SSL_FLAG(SSL_IS_CLIENT);
- X509_CTX **chain = x509_ctx;
- offset += 2;
-
- PARANOIA_CHECK(total_cert_size, offset);
-
- while (offset < total_cert_size)
- {
- offset++; /* skip empty char */
- cert_size = (buf[offset]<<8) + buf[offset+1];
- offset += 2;
-
- if (x509_new(&buf[offset], NULL, chain))
- {
- ret = SSL_ERROR_BAD_CERTIFICATE;
- goto error;
- }
-
- /* DISPLAY_CERT(ssl, *chain); */
- chain = &((*chain)->next);
- offset += cert_size;
- }
-
- PARANOIA_CHECK(pkt_size, offset);
-
- /* if we are client we can do the verify now or later */
- if (is_client && !IS_SET_SSL_FLAG(SSL_SERVER_VERIFY_LATER))
- {
- ret = ssl_verify_cert(ssl);
- }
-
- ssl->next_state = is_client ? HS_SERVER_HELLO_DONE : HS_CLIENT_KEY_XCHG;
- ssl->dc->bm_proc_index += offset;
-error:
- return ret;
-}
-
-#endif /* CONFIG_SSL_CERT_VERIFICATION */
-
-/**
- * Debugging routine to display SSL handshaking stuff.
- */
-#ifdef CONFIG_SSL_FULL_MODE
-/**
- * Debugging routine to display SSL states.
- */
-void DISPLAY_STATE(SSL *ssl, int is_send, uint8_t state, int not_ok)
-{
- const char *str;
-
- if (!IS_SET_SSL_FLAG(SSL_DISPLAY_STATES))
- return;
-
- printf(not_ok ? "Error - invalid State:\t" : "State:\t");
- printf(is_send ? "sending " : "receiving ");
-
- switch (state)
- {
- case HS_HELLO_REQUEST:
- str = "Hello Request (0)";
- break;
-
- case HS_CLIENT_HELLO:
- str = "Client Hello (1)";
- break;
-
- case HS_SERVER_HELLO:
- str = "Server Hello (2)";
- break;
-
- case HS_CERTIFICATE:
- str = "Certificate (11)";
- break;
-
- case HS_SERVER_KEY_XCHG:
- str = "Certificate Request (12)";
- break;
-
- case HS_CERT_REQ:
- str = "Certificate Request (13)";
- break;
-
- case HS_SERVER_HELLO_DONE:
- str = "Server Hello Done (14)";
- break;
-
- case HS_CERT_VERIFY:
- str = "Certificate Verify (15)";
- break;
-
- case HS_CLIENT_KEY_XCHG:
- str = "Client Key Exchange (16)";
- break;
-
- case HS_FINISHED:
- str = "Finished (16)";
- break;
-
- default:
- str = "Error (Unknown)";
-
- break;
- }
-
- printf("%s\n", str);
- TTY_FLUSH();
-}
-
-/**
- * Debugging routine to display X509 certificates.
- */
-void DISPLAY_CERT(SSL *ssl, const X509_CTX *x509_ctx)
-{
- if (!IS_SET_SSL_FLAG(SSL_DISPLAY_CERTS))
- return;
-
- x509_print(x509_ctx, ssl->ssl_ctx->ca_cert_ctx);
- TTY_FLUSH();
-}
-
-/**
- * Debugging routine to display RSA objects
- */
-void DISPLAY_RSA(SSL *ssl, const RSA_CTX *rsa_ctx)
-{
- if (!IS_SET_SSL_FLAG(SSL_DISPLAY_RSA))
- return;
-
- RSA_print(rsa_ctx);
- TTY_FLUSH();
-}
-
-/**
- * Debugging routine to display SSL handshaking bytes.
- */
-void DISPLAY_BYTES(SSL *ssl, const char *format,
- const uint8_t *data, int size, ...)
-{
- va_list(ap);
-
- if (!IS_SET_SSL_FLAG(SSL_DISPLAY_BYTES))
- return;
-
- va_start(ap, size);
- print_blob(format, data, size, va_arg(ap, char *));
- va_end(ap);
- TTY_FLUSH();
-}
-
-/**
- * Debugging routine to display SSL handshaking errors.
- */
-EXP_FUNC void STDCALL ssl_display_error(int error_code)
-{
- if (error_code == SSL_OK)
- return;
-
- printf("Error: ");
-
- /* X509 error? */
- if (error_code < SSL_X509_OFFSET)
- {
- printf("%s\n", x509_display_error(error_code - SSL_X509_OFFSET));
- return;
- }
-
- /* SSL alert error code */
- if (error_code > SSL_ERROR_CONN_LOST)
- {
- printf("SSL error %d\n", -error_code);
- return;
- }
-
- switch (error_code)
- {
- case SSL_ERROR_DEAD:
- printf("connection dead");
- break;
-
- case SSL_ERROR_INVALID_HANDSHAKE:
- printf("invalid handshake");
- break;
-
- case SSL_ERROR_INVALID_PROT_MSG:
- printf("invalid protocol message");
- break;
-
- case SSL_ERROR_INVALID_HMAC:
- printf("invalid mac");
- break;
-
- case SSL_ERROR_INVALID_VERSION:
- printf("invalid version");
- break;
-
- case SSL_ERROR_INVALID_SESSION:
- printf("invalid session");
- break;
-
- case SSL_ERROR_NO_CIPHER:
- printf("no cipher");
- break;
-
- case SSL_ERROR_CONN_LOST:
- printf("connection lost");
- break;
-
- case SSL_ERROR_BAD_CERTIFICATE:
- printf("bad certificate");
- break;
-
- case SSL_ERROR_INVALID_KEY:
- printf("invalid key");
- break;
-
- case SSL_ERROR_FINISHED_INVALID:
- printf("finished invalid");
- break;
-
- case SSL_ERROR_NO_CERT_DEFINED:
- printf("no certificate defined");
- break;
-
- case SSL_ERROR_NOT_SUPPORTED:
- printf("Option not supported");
- break;
-
- default:
- printf("undefined as yet - %d", error_code);
- break;
- }
-
- printf("\n");
- TTY_FLUSH();
-}
-
-/**
- * Debugging routine to display alerts.
- */
-void DISPLAY_ALERT(SSL *ssl, int alert)
-{
- if (!IS_SET_SSL_FLAG(SSL_DISPLAY_STATES))
- return;
-
- printf("Alert: ");
-
- switch (alert)
- {
- case SSL_ALERT_CLOSE_NOTIFY:
- printf("close notify");
- break;
-
- case SSL_ALERT_INVALID_VERSION:
- printf("invalid version");
- break;
-
- case SSL_ALERT_BAD_CERTIFICATE:
- printf("bad certificate");
- break;
-
- case SSL_ALERT_UNEXPECTED_MESSAGE:
- printf("unexpected message");
- break;
-
- case SSL_ALERT_BAD_RECORD_MAC:
- printf("bad record mac");
- break;
-
- case SSL_ALERT_HANDSHAKE_FAILURE:
- printf("handshake failure");
- break;
-
- case SSL_ALERT_ILLEGAL_PARAMETER:
- printf("illegal parameter");
- break;
-
- case SSL_ALERT_DECODE_ERROR:
- printf("decode error");
- break;
-
- case SSL_ALERT_DECRYPT_ERROR:
- printf("decrypt error");
- break;
-
- default:
- printf("alert - (unknown %d)", alert);
- break;
- }
-
- printf("\n");
- TTY_FLUSH();
-}
-
-#endif /* CONFIG_SSL_FULL_MODE */
-
-/**
- * Return the version of this library.
- */
-EXP_FUNC const char * STDCALL ssl_version()
-{
- static const char * axtls_version = AXTLS_VERSION;
- return axtls_version;
-}
-
-/**
- * Enable the various language bindings to work regardless of the
- * configuration - they just return an error statement and a bad return code.
- */
-#if !defined(CONFIG_SSL_FULL_MODE)
-EXP_FUNC void STDCALL ssl_display_error(int error_code) {}
-#endif
-
-#ifdef CONFIG_BINDINGS
-#if !defined(CONFIG_SSL_ENABLE_CLIENT)
-EXP_FUNC SSL * STDCALL ssl_client_new(SSL_CTX *ssl_ctx, int client_fd, const
- uint8_t *session_id, uint8_t sess_id_size)
-{
- printf(unsupported_str);
- return NULL;
-}
-#endif
-
-#if !defined(CONFIG_SSL_CERT_VERIFICATION)
-EXP_FUNC int STDCALL ssl_verify_cert(const SSL *ssl)
-{
- printf(unsupported_str);
- return -1;
-}
-
-EXP_FUNC const char * STDCALL ssl_get_cert_dn(const SSL *ssl, int component)
-{
- printf(unsupported_str);
- return NULL;
-}
-
-#endif /* CONFIG_SSL_CERT_VERIFICATION */
-
-#endif /* CONFIG_BINDINGS */
-
projects / project / luci.git / blobdiff