diff options
Diffstat (limited to 'thirdparty/openssl/ssl/s2_srvr.c')
| -rw-r--r-- | thirdparty/openssl/ssl/s2_srvr.c | 1171 |
1 files changed, 1171 insertions, 0 deletions
diff --git a/thirdparty/openssl/ssl/s2_srvr.c b/thirdparty/openssl/ssl/s2_srvr.c new file mode 100644 index 0000000000..07e9df8282 --- /dev/null +++ b/thirdparty/openssl/ssl/s2_srvr.c @@ -0,0 +1,1171 @@ +/* ssl/s2_srvr.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ +/* ==================================================================== + * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. 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. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED 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 OpenSSL PROJECT OR + * ITS 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. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ + +#include "ssl_locl.h" +#ifndef OPENSSL_NO_SSL2 +#include "../crypto/constant_time_locl.h" +# include <stdio.h> +# include <openssl/bio.h> +# include <openssl/rand.h> +# include <openssl/objects.h> +# include <openssl/evp.h> + +static const SSL_METHOD *ssl2_get_server_method(int ver); +static int get_client_master_key(SSL *s); +static int get_client_hello(SSL *s); +static int server_hello(SSL *s); +static int get_client_finished(SSL *s); +static int server_verify(SSL *s); +static int server_finish(SSL *s); +static int request_certificate(SSL *s); +static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from, + unsigned char *to, int padding); +# define BREAK break + +static const SSL_METHOD *ssl2_get_server_method(int ver) +{ + if (ver == SSL2_VERSION) + return (SSLv2_server_method()); + else + return (NULL); +} + +IMPLEMENT_ssl2_meth_func(SSLv2_server_method, + ssl2_accept, + ssl_undefined_function, ssl2_get_server_method) + +int ssl2_accept(SSL *s) +{ + unsigned long l = (unsigned long)time(NULL); + BUF_MEM *buf = NULL; + int ret = -1; + long num1; + void (*cb) (const SSL *ssl, int type, int val) = NULL; + int new_state, state; + + RAND_add(&l, sizeof(l), 0); + ERR_clear_error(); + clear_sys_error(); + + if (s->info_callback != NULL) + cb = s->info_callback; + else if (s->ctx->info_callback != NULL) + cb = s->ctx->info_callback; + + /* init things to blank */ + s->in_handshake++; + if (!SSL_in_init(s) || SSL_in_before(s)) + SSL_clear(s); + + if (s->cert == NULL) { + SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_NO_CERTIFICATE_SET); + return (-1); + } + + clear_sys_error(); + for (;;) { + state = s->state; + + switch (s->state) { + case SSL_ST_BEFORE: + case SSL_ST_ACCEPT: + case SSL_ST_BEFORE | SSL_ST_ACCEPT: + case SSL_ST_OK | SSL_ST_ACCEPT: + + s->server = 1; + if (cb != NULL) + cb(s, SSL_CB_HANDSHAKE_START, 1); + + s->version = SSL2_VERSION; + s->type = SSL_ST_ACCEPT; + + if (s->init_buf == NULL) { + if ((buf = BUF_MEM_new()) == NULL) { + ret = -1; + goto end; + } + if (!BUF_MEM_grow + (buf, (int)SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { + BUF_MEM_free(buf); + ret = -1; + goto end; + } + s->init_buf = buf; + } + s->init_num = 0; + s->ctx->stats.sess_accept++; + s->handshake_func = ssl2_accept; + s->state = SSL2_ST_GET_CLIENT_HELLO_A; + BREAK; + + case SSL2_ST_GET_CLIENT_HELLO_A: + case SSL2_ST_GET_CLIENT_HELLO_B: + case SSL2_ST_GET_CLIENT_HELLO_C: + s->shutdown = 0; + ret = get_client_hello(s); + if (ret <= 0) + goto end; + s->init_num = 0; + s->state = SSL2_ST_SEND_SERVER_HELLO_A; + BREAK; + + case SSL2_ST_SEND_SERVER_HELLO_A: + case SSL2_ST_SEND_SERVER_HELLO_B: + ret = server_hello(s); + if (ret <= 0) + goto end; + s->init_num = 0; + if (!s->hit) { + s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_A; + BREAK; + } else { + s->state = SSL2_ST_SERVER_START_ENCRYPTION; + BREAK; + } + case SSL2_ST_GET_CLIENT_MASTER_KEY_A: + case SSL2_ST_GET_CLIENT_MASTER_KEY_B: + ret = get_client_master_key(s); + if (ret <= 0) + goto end; + s->init_num = 0; + s->state = SSL2_ST_SERVER_START_ENCRYPTION; + BREAK; + + case SSL2_ST_SERVER_START_ENCRYPTION: + /* + * Ok we how have sent all the stuff needed to start encrypting, + * the next packet back will be encrypted. + */ + if (!ssl2_enc_init(s, 0)) { + ret = -1; + goto end; + } + s->s2->clear_text = 0; + s->state = SSL2_ST_SEND_SERVER_VERIFY_A; + BREAK; + + case SSL2_ST_SEND_SERVER_VERIFY_A: + case SSL2_ST_SEND_SERVER_VERIFY_B: + ret = server_verify(s); + if (ret <= 0) + goto end; + s->init_num = 0; + if (s->hit) { + /* + * If we are in here, we have been buffering the output, so + * we need to flush it and remove buffering from future + * traffic + */ + s->state = SSL2_ST_SEND_SERVER_VERIFY_C; + BREAK; + } else { + s->state = SSL2_ST_GET_CLIENT_FINISHED_A; + break; + } + + case SSL2_ST_SEND_SERVER_VERIFY_C: + /* get the number of bytes to write */ + num1 = BIO_ctrl(s->wbio, BIO_CTRL_INFO, 0, NULL); + if (num1 > 0) { + s->rwstate = SSL_WRITING; + num1 = BIO_flush(s->wbio); + if (num1 <= 0) { + ret = -1; + goto end; + } + s->rwstate = SSL_NOTHING; + } + + /* flushed and now remove buffering */ + s->wbio = BIO_pop(s->wbio); + + s->state = SSL2_ST_GET_CLIENT_FINISHED_A; + BREAK; + + case SSL2_ST_GET_CLIENT_FINISHED_A: + case SSL2_ST_GET_CLIENT_FINISHED_B: + ret = get_client_finished(s); + if (ret <= 0) + goto end; + s->init_num = 0; + s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_A; + BREAK; + + case SSL2_ST_SEND_REQUEST_CERTIFICATE_A: + case SSL2_ST_SEND_REQUEST_CERTIFICATE_B: + case SSL2_ST_SEND_REQUEST_CERTIFICATE_C: + case SSL2_ST_SEND_REQUEST_CERTIFICATE_D: + /* + * don't do a 'request certificate' if we don't want to, or we + * already have one, and we only want to do it once. + */ + if (!(s->verify_mode & SSL_VERIFY_PEER) || + ((s->session->peer != NULL) && + (s->verify_mode & SSL_VERIFY_CLIENT_ONCE))) { + s->state = SSL2_ST_SEND_SERVER_FINISHED_A; + break; + } else { + ret = request_certificate(s); + if (ret <= 0) + goto end; + s->init_num = 0; + s->state = SSL2_ST_SEND_SERVER_FINISHED_A; + } + BREAK; + + case SSL2_ST_SEND_SERVER_FINISHED_A: + case SSL2_ST_SEND_SERVER_FINISHED_B: + ret = server_finish(s); + if (ret <= 0) + goto end; + s->init_num = 0; + s->state = SSL_ST_OK; + break; + + case SSL_ST_OK: + BUF_MEM_free(s->init_buf); + ssl_free_wbio_buffer(s); + s->init_buf = NULL; + s->init_num = 0; + /* ERR_clear_error(); */ + + ssl_update_cache(s, SSL_SESS_CACHE_SERVER); + + s->ctx->stats.sess_accept_good++; + /* s->server=1; */ + ret = 1; + + if (cb != NULL) + cb(s, SSL_CB_HANDSHAKE_DONE, 1); + + goto end; + /* BREAK; */ + + default: + SSLerr(SSL_F_SSL2_ACCEPT, SSL_R_UNKNOWN_STATE); + ret = -1; + goto end; + /* BREAK; */ + } + + if ((cb != NULL) && (s->state != state)) { + new_state = s->state; + s->state = state; + cb(s, SSL_CB_ACCEPT_LOOP, 1); + s->state = new_state; + } + } + end: + s->in_handshake--; + if (cb != NULL) + cb(s, SSL_CB_ACCEPT_EXIT, ret); + return (ret); +} + +static int get_client_master_key(SSL *s) +{ + int is_export, i, n, keya; + unsigned int num_encrypted_key_bytes, key_length; + unsigned long len; + unsigned char *p; + const SSL_CIPHER *cp; + const EVP_CIPHER *c; + const EVP_MD *md; + unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; + unsigned char decrypt_good; + size_t j; + + p = (unsigned char *)s->init_buf->data; + if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A) { + i = ssl2_read(s, (char *)&(p[s->init_num]), 10 - s->init_num); + + if (i < (10 - s->init_num)) + return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i)); + s->init_num = 10; + + if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY) { + if (p[-1] != SSL2_MT_ERROR) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, + SSL_R_READ_WRONG_PACKET_TYPE); + } else + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR); + return (-1); + } + + cp = ssl2_get_cipher_by_char(p); + if (cp == NULL || sk_SSL_CIPHER_find(s->session->ciphers, cp) < 0) { + ssl2_return_error(s, SSL2_PE_NO_CIPHER); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH); + return (-1); + } + s->session->cipher = cp; + + p += 3; + n2s(p, i); + s->s2->tmp.clear = i; + n2s(p, i); + s->s2->tmp.enc = i; + n2s(p, i); + if (i > SSL_MAX_KEY_ARG_LENGTH) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG); + return -1; + } + s->session->key_arg_length = i; + s->state = SSL2_ST_GET_CLIENT_MASTER_KEY_B; + } + + /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */ + p = (unsigned char *)s->init_buf->data; + if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); + return -1; + } + keya = s->session->key_arg_length; + len = + 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + + (unsigned long)keya; + if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_MESSAGE_TOO_LONG); + return -1; + } + n = (int)len - s->init_num; + i = ssl2_read(s, (char *)&(p[s->init_num]), n); + if (i != n) + return (ssl2_part_read(s, SSL_F_GET_CLIENT_MASTER_KEY, i)); + if (s->msg_callback) { + /* CLIENT-MASTER-KEY */ + s->msg_callback(0, s->version, 0, p, (size_t)len, s, + s->msg_callback_arg); + } + p += 10; + + memcpy(s->session->key_arg, &(p[s->s2->tmp.clear + s->s2->tmp.enc]), + (unsigned int)keya); + + if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_PRIVATEKEY); + return (-1); + } + + is_export = SSL_C_IS_EXPORT(s->session->cipher); + + if (!ssl_cipher_get_evp(s->session, &c, &md, NULL, NULL, NULL)) { + ssl2_return_error(s, SSL2_PE_NO_CIPHER); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, + SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); + return (0); + } + + /* + * The format of the CLIENT-MASTER-KEY message is + * 1 byte message type + * 3 bytes cipher + * 2-byte clear key length (stored in s->s2->tmp.clear) + * 2-byte encrypted key length (stored in s->s2->tmp.enc) + * 2-byte key args length (IV etc) + * clear key + * encrypted key + * key args + * + * If the cipher is an export cipher, then the encrypted key bytes + * are a fixed portion of the total key (5 or 8 bytes). The size of + * this portion is in |num_encrypted_key_bytes|. If the cipher is not an + * export cipher, then the entire key material is encrypted (i.e., clear + * key length must be zero). + */ + key_length = (unsigned int)EVP_CIPHER_key_length(c); + if (key_length > SSL_MAX_MASTER_KEY_LENGTH) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); + return -1; + } + + if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) { + is_export = 1; + num_encrypted_key_bytes = 8; + } else if (is_export) { + num_encrypted_key_bytes = 5; + } else { + num_encrypted_key_bytes = key_length; + } + + if (s->s2->tmp.clear + num_encrypted_key_bytes != key_length) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH); + return -1; + } + /* + * The encrypted blob must decrypt to the encrypted portion of the key. + * Decryption can't be expanding, so if we don't have enough encrypted + * bytes to fit the key in the buffer, stop now. + */ + if (s->s2->tmp.enc < num_encrypted_key_bytes) { + ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT); + return -1; + } + + /* + * We must not leak whether a decryption failure occurs because of + * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, + * section 7.4.7.1). The code follows that advice of the TLS RFC and + * generates a random premaster secret for the case that the decrypt + * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 + */ + + /* + * should be RAND_bytes, but we cannot work around a failure. + */ + if (RAND_pseudo_bytes(rand_premaster_secret, + (int)num_encrypted_key_bytes) <= 0) + return 0; + + i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc, + &(p[s->s2->tmp.clear]), + &(p[s->s2->tmp.clear]), + (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING : + RSA_PKCS1_PADDING); + ERR_clear_error(); + /* + * If a bad decrypt, continue with protocol but with a random master + * secret (Bleichenbacher attack) + */ + decrypt_good = constant_time_eq_int_8(i, (int)num_encrypted_key_bytes); + for (j = 0; j < num_encrypted_key_bytes; j++) { + p[s->s2->tmp.clear + j] = + constant_time_select_8(decrypt_good, p[s->s2->tmp.clear + j], + rand_premaster_secret[j]); + } + + s->session->master_key_length = (int)key_length; + memcpy(s->session->master_key, p, key_length); + OPENSSL_cleanse(p, key_length); + + return 1; +} + +static int get_client_hello(SSL *s) +{ + int i, n; + unsigned long len; + unsigned char *p; + STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */ + STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */ + STACK_OF(SSL_CIPHER) *prio, *allow; + int z; + + /* + * This is a bit of a hack to check for the correct packet type the first + * time round. + */ + if (s->state == SSL2_ST_GET_CLIENT_HELLO_A) { + s->first_packet = 1; + s->state = SSL2_ST_GET_CLIENT_HELLO_B; + } + + p = (unsigned char *)s->init_buf->data; + if (s->state == SSL2_ST_GET_CLIENT_HELLO_B) { + i = ssl2_read(s, (char *)&(p[s->init_num]), 9 - s->init_num); + if (i < (9 - s->init_num)) + return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i)); + s->init_num = 9; + + if (*(p++) != SSL2_MT_CLIENT_HELLO) { + if (p[-1] != SSL2_MT_ERROR) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_READ_WRONG_PACKET_TYPE); + } else + SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_PEER_ERROR); + return (-1); + } + n2s(p, i); + if (i < s->version) + s->version = i; + n2s(p, i); + s->s2->tmp.cipher_spec_length = i; + n2s(p, i); + s->s2->tmp.session_id_length = i; + if ((i < 0) || (i > SSL_MAX_SSL_SESSION_ID_LENGTH)) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); + return -1; + } + n2s(p, i); + s->s2->challenge_length = i; + if ((i < SSL2_MIN_CHALLENGE_LENGTH) || + (i > SSL2_MAX_CHALLENGE_LENGTH)) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_INVALID_CHALLENGE_LENGTH); + return (-1); + } + s->state = SSL2_ST_GET_CLIENT_HELLO_C; + } + + /* SSL2_ST_GET_CLIENT_HELLO_C */ + p = (unsigned char *)s->init_buf->data; + len = + 9 + (unsigned long)s->s2->tmp.cipher_spec_length + + (unsigned long)s->s2->challenge_length + + (unsigned long)s->s2->tmp.session_id_length; + if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_MESSAGE_TOO_LONG); + return -1; + } + n = (int)len - s->init_num; + i = ssl2_read(s, (char *)&(p[s->init_num]), n); + if (i != n) + return (ssl2_part_read(s, SSL_F_GET_CLIENT_HELLO, i)); + if (s->msg_callback) { + /* CLIENT-HELLO */ + s->msg_callback(0, s->version, 0, p, (size_t)len, s, + s->msg_callback_arg); + } + p += 9; + + /* + * get session-id before cipher stuff so we can get out session structure + * if it is cached + */ + /* session-id */ + if ((s->s2->tmp.session_id_length != 0) && + (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH)) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_BAD_SSL_SESSION_ID_LENGTH); + return (-1); + } + + if (s->s2->tmp.session_id_length == 0) { + if (!ssl_get_new_session(s, 1)) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + return (-1); + } + } else { + i = ssl_get_prev_session(s, &(p[s->s2->tmp.cipher_spec_length]), + s->s2->tmp.session_id_length, NULL); + if (i == 1) { /* previous session */ + s->hit = 1; + } else if (i == -1) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + return (-1); + } else { + if (s->cert == NULL) { + ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE); + SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CERTIFICATE_SET); + return (-1); + } + + if (!ssl_get_new_session(s, 1)) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + return (-1); + } + } + } + + if (!s->hit) { + cs = ssl_bytes_to_cipher_list(s, p, s->s2->tmp.cipher_spec_length, + &s->session->ciphers); + if (cs == NULL) + goto mem_err; + + cl = SSL_get_ciphers(s); + + if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { + prio = sk_SSL_CIPHER_dup(cl); + if (prio == NULL) + goto mem_err; + allow = cs; + } else { + prio = cs; + allow = cl; + } + + /* Generate list of SSLv2 ciphers shared between client and server */ + for (z = 0; z < sk_SSL_CIPHER_num(prio); z++) { + const SSL_CIPHER *cp = sk_SSL_CIPHER_value(prio, z); + if ((cp->algorithm_ssl & SSL_SSLV2) == 0 || + sk_SSL_CIPHER_find(allow, cp) < 0) { + (void)sk_SSL_CIPHER_delete(prio, z); + z--; + } + } + if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { + sk_SSL_CIPHER_free(s->session->ciphers); + s->session->ciphers = prio; + } + + /* Make sure we have at least one cipher in common */ + if (sk_SSL_CIPHER_num(s->session->ciphers) == 0) { + ssl2_return_error(s, SSL2_PE_NO_CIPHER); + SSLerr(SSL_F_GET_CLIENT_HELLO, SSL_R_NO_CIPHER_MATCH); + return -1; + } + /* + * s->session->ciphers should now have a list of ciphers that are on + * both the client and server. This list is ordered by the order the + * client sent the ciphers or in the order of the server's preference + * if SSL_OP_CIPHER_SERVER_PREFERENCE was set. + */ + } + p += s->s2->tmp.cipher_spec_length; + /* done cipher selection */ + + /* session id extracted already */ + p += s->s2->tmp.session_id_length; + + /* challenge */ + if (s->s2->challenge_length > sizeof s->s2->challenge) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); + return -1; + } + memcpy(s->s2->challenge, p, (unsigned int)s->s2->challenge_length); + return (1); + mem_err: + SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_MALLOC_FAILURE); + return (0); +} + +static int server_hello(SSL *s) +{ + unsigned char *p, *d; + int n, hit; + + p = (unsigned char *)s->init_buf->data; + if (s->state == SSL2_ST_SEND_SERVER_HELLO_A) { + d = p + 11; + *(p++) = SSL2_MT_SERVER_HELLO; /* type */ + hit = s->hit; + *(p++) = (unsigned char)hit; +# if 1 + if (!hit) { + if (s->session->sess_cert != NULL) + /* + * This can't really happen because get_client_hello has + * called ssl_get_new_session, which does not set sess_cert. + */ + ssl_sess_cert_free(s->session->sess_cert); + s->session->sess_cert = ssl_sess_cert_new(); + if (s->session->sess_cert == NULL) { + SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE); + return (-1); + } + } + /* + * If 'hit' is set, then s->sess_cert may be non-NULL or NULL, + * depending on whether it survived in the internal cache or was + * retrieved from an external cache. If it is NULL, we cannot put any + * useful data in it anyway, so we don't touch it. + */ + +# else /* That's what used to be done when cert_st + * and sess_cert_st were * the same. */ + if (!hit) { /* else add cert to session */ + CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT); + if (s->session->sess_cert != NULL) + ssl_cert_free(s->session->sess_cert); + s->session->sess_cert = s->cert; + } else { /* We have a session id-cache hit, if the * + * session-id has no certificate listed + * against * the 'cert' structure, grab the + * 'old' one * listed against the SSL + * connection */ + if (s->session->sess_cert == NULL) { + CRYPTO_add(&s->cert->references, 1, CRYPTO_LOCK_SSL_CERT); + s->session->sess_cert = s->cert; + } + } +# endif + + if (s->cert == NULL) { + ssl2_return_error(s, SSL2_PE_NO_CERTIFICATE); + SSLerr(SSL_F_SERVER_HELLO, SSL_R_NO_CERTIFICATE_SPECIFIED); + return (-1); + } + + if (hit) { + *(p++) = 0; /* no certificate type */ + s2n(s->version, p); /* version */ + s2n(0, p); /* cert len */ + s2n(0, p); /* ciphers len */ + } else { + /* EAY EAY */ + /* put certificate type */ + *(p++) = SSL2_CT_X509_CERTIFICATE; + s2n(s->version, p); /* version */ + n = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL); + s2n(n, p); /* certificate length */ + i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &d); + n = 0; + + /* + * lets send out the ciphers we like in the prefered order + */ + n = ssl_cipher_list_to_bytes(s, s->session->ciphers, d, 0); + d += n; + s2n(n, p); /* add cipher length */ + } + + /* make and send conn_id */ + s2n(SSL2_CONNECTION_ID_LENGTH, p); /* add conn_id length */ + s->s2->conn_id_length = SSL2_CONNECTION_ID_LENGTH; + if (RAND_pseudo_bytes(s->s2->conn_id, (int)s->s2->conn_id_length) <= + 0) + return -1; + memcpy(d, s->s2->conn_id, SSL2_CONNECTION_ID_LENGTH); + d += SSL2_CONNECTION_ID_LENGTH; + + s->state = SSL2_ST_SEND_SERVER_HELLO_B; + s->init_num = d - (unsigned char *)s->init_buf->data; + s->init_off = 0; + } + /* SSL2_ST_SEND_SERVER_HELLO_B */ + /* + * If we are using TCP/IP, the performance is bad if we do 2 writes + * without a read between them. This occurs when Session-id reuse is + * used, so I will put in a buffering module + */ + if (s->hit) { + if (!ssl_init_wbio_buffer(s, 1)) + return (-1); + } + + return (ssl2_do_write(s)); +} + +static int get_client_finished(SSL *s) +{ + unsigned char *p; + int i, n; + unsigned long len; + + p = (unsigned char *)s->init_buf->data; + if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) { + i = ssl2_read(s, (char *)&(p[s->init_num]), 1 - s->init_num); + if (i < 1 - s->init_num) + return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i)); + s->init_num += i; + + if (*p != SSL2_MT_CLIENT_FINISHED) { + if (*p != SSL2_MT_ERROR) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_FINISHED, + SSL_R_READ_WRONG_PACKET_TYPE); + } else { + SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_PEER_ERROR); + /* try to read the error message */ + i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num); + return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i); + } + return (-1); + } + s->state = SSL2_ST_GET_CLIENT_FINISHED_B; + } + + /* SSL2_ST_GET_CLIENT_FINISHED_B */ + if (s->s2->conn_id_length > sizeof s->s2->conn_id) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR); + return -1; + } + len = 1 + (unsigned long)s->s2->conn_id_length; + n = (int)len - s->init_num; + i = ssl2_read(s, (char *)&(p[s->init_num]), n); + if (i < n) { + return (ssl2_part_read(s, SSL_F_GET_CLIENT_FINISHED, i)); + } + if (s->msg_callback) { + /* CLIENT-FINISHED */ + s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); + } + p += 1; + if (memcmp(p, s->s2->conn_id, s->s2->conn_id_length) != 0) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_GET_CLIENT_FINISHED, SSL_R_CONNECTION_ID_IS_DIFFERENT); + return (-1); + } + return (1); +} + +static int server_verify(SSL *s) +{ + unsigned char *p; + + if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A) { + p = (unsigned char *)s->init_buf->data; + *(p++) = SSL2_MT_SERVER_VERIFY; + if (s->s2->challenge_length > sizeof s->s2->challenge) { + SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR); + return -1; + } + memcpy(p, s->s2->challenge, (unsigned int)s->s2->challenge_length); + /* p+=s->s2->challenge_length; */ + + s->state = SSL2_ST_SEND_SERVER_VERIFY_B; + s->init_num = s->s2->challenge_length + 1; + s->init_off = 0; + } + return (ssl2_do_write(s)); +} + +static int server_finish(SSL *s) +{ + unsigned char *p; + + if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A) { + p = (unsigned char *)s->init_buf->data; + *(p++) = SSL2_MT_SERVER_FINISHED; + + if (s->session->session_id_length > sizeof s->session->session_id) { + SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR); + return -1; + } + memcpy(p, s->session->session_id, + (unsigned int)s->session->session_id_length); + /* p+=s->session->session_id_length; */ + + s->state = SSL2_ST_SEND_SERVER_FINISHED_B; + s->init_num = s->session->session_id_length + 1; + s->init_off = 0; + } + + /* SSL2_ST_SEND_SERVER_FINISHED_B */ + return (ssl2_do_write(s)); +} + +/* send the request and check the response */ +static int request_certificate(SSL *s) +{ + const unsigned char *cp; + unsigned char *p, *p2, *buf2; + unsigned char *ccd; + int i, j, ctype, ret = -1; + unsigned long len; + X509 *x509 = NULL; + STACK_OF(X509) *sk = NULL; + + ccd = s->s2->tmp.ccl; + if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A) { + p = (unsigned char *)s->init_buf->data; + *(p++) = SSL2_MT_REQUEST_CERTIFICATE; + *(p++) = SSL2_AT_MD5_WITH_RSA_ENCRYPTION; + if (RAND_pseudo_bytes(ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0) + return -1; + memcpy(p, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH); + + s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_B; + s->init_num = SSL2_MIN_CERT_CHALLENGE_LENGTH + 2; + s->init_off = 0; + } + + if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B) { + i = ssl2_do_write(s); + if (i <= 0) { + ret = i; + goto end; + } + + s->init_num = 0; + s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_C; + } + + if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) { + p = (unsigned char *)s->init_buf->data; + /* try to read 6 octets ... */ + i = ssl2_read(s, (char *)&(p[s->init_num]), 6 - s->init_num); + /* + * ... but don't call ssl2_part_read now if we got at least 3 + * (probably NO-CERTIFICATE-ERROR) + */ + if (i < 3 - s->init_num) { + ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i); + goto end; + } + s->init_num += i; + + if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR)) { + n2s(p, i); + if (i != SSL2_PE_NO_CERTIFICATE) { + /* + * not the error message we expected -- let ssl2_part_read + * handle it + */ + s->init_num -= 3; + ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, 3); + goto end; + } + + if (s->msg_callback) { + /* ERROR */ + s->msg_callback(0, s->version, 0, p, 3, s, + s->msg_callback_arg); + } + + /* + * this is the one place where we can recover from an SSL 2.0 + * error + */ + + if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) { + ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE); + SSLerr(SSL_F_REQUEST_CERTIFICATE, + SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); + goto end; + } + ret = 1; + goto end; + } + if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6)) { + ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); + SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_SHORT_READ); + goto end; + } + if (s->init_num != 6) { + SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR); + goto end; + } + + /* ok we have a response */ + /* certificate type, there is only one right now. */ + ctype = *(p++); + if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) { + ssl2_return_error(s, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE); + SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_RESPONSE_ARGUMENT); + goto end; + } + n2s(p, i); + s->s2->tmp.clen = i; + n2s(p, i); + s->s2->tmp.rlen = i; + s->state = SSL2_ST_SEND_REQUEST_CERTIFICATE_D; + } + + /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */ + p = (unsigned char *)s->init_buf->data; + len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen; + if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { + SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_MESSAGE_TOO_LONG); + goto end; + } + j = (int)len - s->init_num; + i = ssl2_read(s, (char *)&(p[s->init_num]), j); + if (i < j) { + ret = ssl2_part_read(s, SSL_F_REQUEST_CERTIFICATE, i); + goto end; + } + if (s->msg_callback) { + /* CLIENT-CERTIFICATE */ + s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); + } + p += 6; + + cp = p; + x509 = (X509 *)d2i_X509(NULL, &cp, (long)s->s2->tmp.clen); + if (x509 == NULL) { + SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_X509_LIB); + goto msg_end; + } + + if (((sk = sk_X509_new_null()) == NULL) || (!sk_X509_push(sk, x509))) { + SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE); + goto msg_end; + } + + i = ssl_verify_cert_chain(s, sk); + + if (i > 0) { /* we like the packet, now check the chksum */ + EVP_MD_CTX ctx; + EVP_PKEY *pkey = NULL; + + EVP_MD_CTX_init(&ctx); + if (!EVP_VerifyInit_ex(&ctx, s->ctx->rsa_md5, NULL) + || !EVP_VerifyUpdate(&ctx, s->s2->key_material, + s->s2->key_material_length) + || !EVP_VerifyUpdate(&ctx, ccd, SSL2_MIN_CERT_CHALLENGE_LENGTH)) + goto msg_end; + + i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, NULL); + buf2 = OPENSSL_malloc((unsigned int)i); + if (buf2 == NULL) { + SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_MALLOC_FAILURE); + goto msg_end; + } + p2 = buf2; + i = i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509, &p2); + if (!EVP_VerifyUpdate(&ctx, buf2, (unsigned int)i)) { + OPENSSL_free(buf2); + goto msg_end; + } + OPENSSL_free(buf2); + + pkey = X509_get_pubkey(x509); + if (pkey == NULL) + goto end; + i = EVP_VerifyFinal(&ctx, cp, s->s2->tmp.rlen, pkey); + EVP_PKEY_free(pkey); + EVP_MD_CTX_cleanup(&ctx); + + if (i > 0) { + if (s->session->peer != NULL) + X509_free(s->session->peer); + s->session->peer = x509; + CRYPTO_add(&x509->references, 1, CRYPTO_LOCK_X509); + s->session->verify_result = s->verify_result; + ret = 1; + goto end; + } else { + SSLerr(SSL_F_REQUEST_CERTIFICATE, SSL_R_BAD_CHECKSUM); + goto msg_end; + } + } else { + msg_end: + ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE); + } + end: + sk_X509_free(sk); + X509_free(x509); + return (ret); +} + +static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from, + unsigned char *to, int padding) +{ + RSA *rsa; + int i; + + if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)) { + SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_NO_PRIVATEKEY); + return (-1); + } + if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA) { + SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, SSL_R_PUBLIC_KEY_IS_NOT_RSA); + return (-1); + } + rsa = c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa; + + /* we have the public key */ + i = RSA_private_decrypt(len, from, to, rsa, padding); + if (i < 0) + SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT, ERR_R_RSA_LIB); + return (i); +} +#else /* !OPENSSL_NO_SSL2 */ + +# if PEDANTIC +static void *dummy = &dummy; +# endif + +#endif |