diff options
Diffstat (limited to 'openssl/ssl/s23_srvr.c')
| -rw-r--r-- | openssl/ssl/s23_srvr.c | 1027 |
1 files changed, 507 insertions, 520 deletions
diff --git a/openssl/ssl/s23_srvr.c b/openssl/ssl/s23_srvr.c index 3178815ec..50f98dced 100644 --- a/openssl/ssl/s23_srvr.c +++ b/openssl/ssl/s23_srvr.c @@ -5,21 +5,21 @@ * 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: @@ -34,10 +34,10 @@ * 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 + * 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 @@ -49,7 +49,7 @@ * 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 @@ -63,7 +63,7 @@ * are met: * * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * 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 @@ -116,545 +116,532 @@ #include <openssl/objects.h> #include <openssl/evp.h> #ifdef OPENSSL_FIPS -#include <openssl/fips.h> +# include <openssl/fips.h> #endif static const SSL_METHOD *ssl23_get_server_method(int ver); int ssl23_get_client_hello(SSL *s); static const SSL_METHOD *ssl23_get_server_method(int ver) - { +{ #ifndef OPENSSL_NO_SSL2 - if (ver == SSL2_VERSION) - return(SSLv2_server_method()); + if (ver == SSL2_VERSION) + return (SSLv2_server_method()); #endif #ifndef OPENSSL_NO_SSL3 - if (ver == SSL3_VERSION) - return(SSLv3_server_method()); + if (ver == SSL3_VERSION) + return (SSLv3_server_method()); #endif - if (ver == TLS1_VERSION) - return(TLSv1_server_method()); - else if (ver == TLS1_1_VERSION) - return(TLSv1_1_server_method()); - else if (ver == TLS1_2_VERSION) - return(TLSv1_2_server_method()); - else - return(NULL); - } + if (ver == TLS1_VERSION) + return (TLSv1_server_method()); + else if (ver == TLS1_1_VERSION) + return (TLSv1_1_server_method()); + else if (ver == TLS1_2_VERSION) + return (TLSv1_2_server_method()); + else + return (NULL); +} IMPLEMENT_ssl23_meth_func(SSLv23_server_method, - ssl23_accept, - ssl_undefined_function, - ssl23_get_server_method) + ssl23_accept, + ssl_undefined_function, ssl23_get_server_method) int ssl23_accept(SSL *s) - { - BUF_MEM *buf; - unsigned long Time=(unsigned long)time(NULL); - void (*cb)(const SSL *ssl,int type,int val)=NULL; - int ret= -1; - int new_state,state; - - RAND_add(&Time,sizeof(Time),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; - - s->in_handshake++; - if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); - - 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=SSL3_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,SSL3_RT_MAX_PLAIN_LENGTH)) - { - BUF_MEM_free(buf); - ret= -1; - goto end; - } - s->init_buf=buf; - } - - ssl3_init_finished_mac(s); - - s->state=SSL23_ST_SR_CLNT_HELLO_A; - s->ctx->stats.sess_accept++; - s->init_num=0; - break; - - case SSL23_ST_SR_CLNT_HELLO_A: - case SSL23_ST_SR_CLNT_HELLO_B: - - s->shutdown=0; - ret=ssl23_get_client_hello(s); - if (ret >= 0) cb=NULL; - goto end; - /* break; */ - - default: - SSLerr(SSL_F_SSL23_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); - } - +{ + BUF_MEM *buf; + unsigned long Time = (unsigned long)time(NULL); + void (*cb) (const SSL *ssl, int type, int val) = NULL; + int ret = -1; + int new_state, state; + + RAND_add(&Time, sizeof(Time), 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; + + s->in_handshake++; + if (!SSL_in_init(s) || SSL_in_before(s)) + SSL_clear(s); + + 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=SSL3_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, SSL3_RT_MAX_PLAIN_LENGTH)) { + BUF_MEM_free(buf); + ret = -1; + goto end; + } + s->init_buf = buf; + } + + ssl3_init_finished_mac(s); + + s->state = SSL23_ST_SR_CLNT_HELLO_A; + s->ctx->stats.sess_accept++; + s->init_num = 0; + break; + + case SSL23_ST_SR_CLNT_HELLO_A: + case SSL23_ST_SR_CLNT_HELLO_B: + + s->shutdown = 0; + ret = ssl23_get_client_hello(s); + if (ret >= 0) + cb = NULL; + goto end; + /* break; */ + + default: + SSLerr(SSL_F_SSL23_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); +} int ssl23_get_client_hello(SSL *s) - { - char buf_space[11]; /* Request this many bytes in initial read. - * We can detect SSL 3.0/TLS 1.0 Client Hellos - * ('type == 3') correctly only when the following - * is in a single record, which is not guaranteed by - * the protocol specification: - * Byte Content - * 0 type \ - * 1/2 version > record header - * 3/4 length / - * 5 msg_type \ - * 6-8 length > Client Hello message - * 9/10 client_version / - */ - char *buf= &(buf_space[0]); - unsigned char *p,*d,*d_len,*dd; - unsigned int i; - unsigned int csl,sil,cl; - int n=0,j; - int type=0; - int v[2]; - - if (s->state == SSL23_ST_SR_CLNT_HELLO_A) - { - /* read the initial header */ - v[0]=v[1]=0; - - if (!ssl3_setup_buffers(s)) goto err; - - n=ssl23_read_bytes(s, sizeof buf_space); - if (n != sizeof buf_space) return(n); /* n == -1 || n == 0 */ - - p=s->packet; - - memcpy(buf,p,n); - - if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) - { - /* - * SSLv2 header - */ - if ((p[3] == 0x00) && (p[4] == 0x02)) - { - v[0]=p[3]; v[1]=p[4]; - /* SSLv2 */ - if (!(s->options & SSL_OP_NO_SSLv2)) - type=1; - } - else if (p[3] == SSL3_VERSION_MAJOR) - { - v[0]=p[3]; v[1]=p[4]; - /* SSLv3/TLSv1 */ - if (p[4] >= TLS1_VERSION_MINOR) - { - if (p[4] >= TLS1_2_VERSION_MINOR && - !(s->options & SSL_OP_NO_TLSv1_2)) - { - s->version=TLS1_2_VERSION; - s->state=SSL23_ST_SR_CLNT_HELLO_B; - } - else if (p[4] >= TLS1_1_VERSION_MINOR && - !(s->options & SSL_OP_NO_TLSv1_1)) - { - s->version=TLS1_1_VERSION; - /* type=2; */ /* done later to survive restarts */ - s->state=SSL23_ST_SR_CLNT_HELLO_B; - } - else if (!(s->options & SSL_OP_NO_TLSv1)) - { - s->version=TLS1_VERSION; - /* type=2; */ /* done later to survive restarts */ - s->state=SSL23_ST_SR_CLNT_HELLO_B; - } - else if (!(s->options & SSL_OP_NO_SSLv3)) - { - s->version=SSL3_VERSION; - /* type=2; */ - s->state=SSL23_ST_SR_CLNT_HELLO_B; - } - else if (!(s->options & SSL_OP_NO_SSLv2)) - { - type=1; - } - } - else if (!(s->options & SSL_OP_NO_SSLv3)) - { - s->version=SSL3_VERSION; - /* type=2; */ - s->state=SSL23_ST_SR_CLNT_HELLO_B; - } - else if (!(s->options & SSL_OP_NO_SSLv2)) - type=1; - - } - } - else if ((p[0] == SSL3_RT_HANDSHAKE) && - (p[1] == SSL3_VERSION_MAJOR) && - (p[5] == SSL3_MT_CLIENT_HELLO) && - ((p[3] == 0 && p[4] < 5 /* silly record length? */) - || (p[9] >= p[1]))) - { - /* - * SSLv3 or tls1 header - */ - - v[0]=p[1]; /* major version (= SSL3_VERSION_MAJOR) */ - /* We must look at client_version inside the Client Hello message - * to get the correct minor version. - * However if we have only a pathologically small fragment of the - * Client Hello message, this would be difficult, and we'd have - * to read more records to find out. - * No known SSL 3.0 client fragments ClientHello like this, - * so we simply reject such connections to avoid - * protocol version downgrade attacks. */ - if (p[3] == 0 && p[4] < 6) - { - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_SMALL); - goto err; - } - /* if major version number > 3 set minor to a value - * which will use the highest version 3 we support. - * If TLS 2.0 ever appears we will need to revise - * this.... - */ - if (p[9] > SSL3_VERSION_MAJOR) - v[1]=0xff; - else - v[1]=p[10]; /* minor version according to client_version */ - if (v[1] >= TLS1_VERSION_MINOR) - { - if (v[1] >= TLS1_2_VERSION_MINOR && - !(s->options & SSL_OP_NO_TLSv1_2)) - { - s->version=TLS1_2_VERSION; - type=3; - } - else if (v[1] >= TLS1_1_VERSION_MINOR && - !(s->options & SSL_OP_NO_TLSv1_1)) - { - s->version=TLS1_1_VERSION; - type=3; - } - else if (!(s->options & SSL_OP_NO_TLSv1)) - { - s->version=TLS1_VERSION; - type=3; - } - else if (!(s->options & SSL_OP_NO_SSLv3)) - { - s->version=SSL3_VERSION; - type=3; - } - } - else - { - /* client requests SSL 3.0 */ - if (!(s->options & SSL_OP_NO_SSLv3)) - { - s->version=SSL3_VERSION; - type=3; - } - else if (!(s->options & SSL_OP_NO_TLSv1)) - { - /* we won't be able to use TLS of course, - * but this will send an appropriate alert */ - s->version=TLS1_VERSION; - type=3; - } - } - } - else if ((strncmp("GET ", (char *)p,4) == 0) || - (strncmp("POST ",(char *)p,5) == 0) || - (strncmp("HEAD ",(char *)p,5) == 0) || - (strncmp("PUT ", (char *)p,4) == 0)) - { - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTP_REQUEST); - goto err; - } - else if (strncmp("CONNECT",(char *)p,7) == 0) - { - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_HTTPS_PROXY_REQUEST); - goto err; - } - } - - /* ensure that TLS_MAX_VERSION is up-to-date */ - OPENSSL_assert(s->version <= TLS_MAX_VERSION); +{ + /*- + * Request this many bytes in initial read. + * We can detect SSL 3.0/TLS 1.0 Client Hellos + * ('type == 3') correctly only when the following + * is in a single record, which is not guaranteed by + * the protocol specification: + * Byte Content + * 0 type \ + * 1/2 version > record header + * 3/4 length / + * 5 msg_type \ + * 6-8 length > Client Hello message + * 9/10 client_version / + */ + char buf_space[11]; + char *buf = &(buf_space[0]); + unsigned char *p, *d, *d_len, *dd; + unsigned int i; + unsigned int csl, sil, cl; + int n = 0, j; + int type = 0; + int v[2]; + + if (s->state == SSL23_ST_SR_CLNT_HELLO_A) { + /* read the initial header */ + v[0] = v[1] = 0; + + if (!ssl3_setup_buffers(s)) + goto err; + + n = ssl23_read_bytes(s, sizeof buf_space); + if (n != sizeof buf_space) + return (n); /* n == -1 || n == 0 */ + + p = s->packet; + + memcpy(buf, p, n); + + if ((p[0] & 0x80) && (p[2] == SSL2_MT_CLIENT_HELLO)) { + /* + * SSLv2 header + */ + if ((p[3] == 0x00) && (p[4] == 0x02)) { + v[0] = p[3]; + v[1] = p[4]; + /* SSLv2 */ + if (!(s->options & SSL_OP_NO_SSLv2)) + type = 1; + } else if (p[3] == SSL3_VERSION_MAJOR) { + v[0] = p[3]; + v[1] = p[4]; + /* SSLv3/TLSv1 */ + if (p[4] >= TLS1_VERSION_MINOR) { + if (p[4] >= TLS1_2_VERSION_MINOR && + !(s->options & SSL_OP_NO_TLSv1_2)) { + s->version = TLS1_2_VERSION; + s->state = SSL23_ST_SR_CLNT_HELLO_B; + } else if (p[4] >= TLS1_1_VERSION_MINOR && + !(s->options & SSL_OP_NO_TLSv1_1)) { + s->version = TLS1_1_VERSION; + /* + * type=2; + *//* + * done later to survive restarts + */ + s->state = SSL23_ST_SR_CLNT_HELLO_B; + } else if (!(s->options & SSL_OP_NO_TLSv1)) { + s->version = TLS1_VERSION; + /* + * type=2; + *//* + * done later to survive restarts + */ + s->state = SSL23_ST_SR_CLNT_HELLO_B; + } else if (!(s->options & SSL_OP_NO_SSLv3)) { + s->version = SSL3_VERSION; + /* type=2; */ + s->state = SSL23_ST_SR_CLNT_HELLO_B; + } else if (!(s->options & SSL_OP_NO_SSLv2)) { + type = 1; + } + } else if (!(s->options & SSL_OP_NO_SSLv3)) { + s->version = SSL3_VERSION; + /* type=2; */ + s->state = SSL23_ST_SR_CLNT_HELLO_B; + } else if (!(s->options & SSL_OP_NO_SSLv2)) + type = 1; + + } + } + /* p[4] < 5 ... silly record length? */ + else if ((p[0] == SSL3_RT_HANDSHAKE) && + (p[1] == SSL3_VERSION_MAJOR) && + (p[5] == SSL3_MT_CLIENT_HELLO) && ((p[3] == 0 && p[4] < 5) + || (p[9] >= p[1]))) { + /* + * SSLv3 or tls1 header + */ + + v[0] = p[1]; /* major version (= SSL3_VERSION_MAJOR) */ + /* + * We must look at client_version inside the Client Hello message + * to get the correct minor version. However if we have only a + * pathologically small fragment of the Client Hello message, this + * would be difficult, and we'd have to read more records to find + * out. No known SSL 3.0 client fragments ClientHello like this, + * so we simply reject such connections to avoid protocol version + * downgrade attacks. + */ + if (p[3] == 0 && p[4] < 6) { + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_SMALL); + goto err; + } + /* + * if major version number > 3 set minor to a value which will + * use the highest version 3 we support. If TLS 2.0 ever appears + * we will need to revise this.... + */ + if (p[9] > SSL3_VERSION_MAJOR) + v[1] = 0xff; + else + v[1] = p[10]; /* minor version according to client_version */ + if (v[1] >= TLS1_VERSION_MINOR) { + if (v[1] >= TLS1_2_VERSION_MINOR && + !(s->options & SSL_OP_NO_TLSv1_2)) { + s->version = TLS1_2_VERSION; + type = 3; + } else if (v[1] >= TLS1_1_VERSION_MINOR && + !(s->options & SSL_OP_NO_TLSv1_1)) { + s->version = TLS1_1_VERSION; + type = 3; + } else if (!(s->options & SSL_OP_NO_TLSv1)) { + s->version = TLS1_VERSION; + type = 3; + } else if (!(s->options & SSL_OP_NO_SSLv3)) { + s->version = SSL3_VERSION; + type = 3; + } + } else { + /* client requests SSL 3.0 */ + if (!(s->options & SSL_OP_NO_SSLv3)) { + s->version = SSL3_VERSION; + type = 3; + } else if (!(s->options & SSL_OP_NO_TLSv1)) { + /* + * we won't be able to use TLS of course, but this will + * send an appropriate alert + */ + s->version = TLS1_VERSION; + type = 3; + } + } + } else if ((strncmp("GET ", (char *)p, 4) == 0) || + (strncmp("POST ", (char *)p, 5) == 0) || + (strncmp("HEAD ", (char *)p, 5) == 0) || + (strncmp("PUT ", (char *)p, 4) == 0)) { + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTP_REQUEST); + goto err; + } else if (strncmp("CONNECT", (char *)p, 7) == 0) { + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_HTTPS_PROXY_REQUEST); + goto err; + } + } + + /* ensure that TLS_MAX_VERSION is up-to-date */ + OPENSSL_assert(s->version <= TLS_MAX_VERSION); #ifdef OPENSSL_FIPS - if (FIPS_mode() && (s->version < TLS1_VERSION)) - { - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, - SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); - goto err; - } + if (FIPS_mode() && (s->version < TLS1_VERSION)) { + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, + SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); + goto err; + } #endif - if (s->state == SSL23_ST_SR_CLNT_HELLO_B) - { - /* we have SSLv3/TLSv1 in an SSLv2 header - * (other cases skip this state) */ - - type=2; - p=s->packet; - v[0] = p[3]; /* == SSL3_VERSION_MAJOR */ - v[1] = p[4]; - - /* An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 - * header is sent directly on the wire, not wrapped as a TLS - * record. It's format is: - * Byte Content - * 0-1 msg_length - * 2 msg_type - * 3-4 version - * 5-6 cipher_spec_length - * 7-8 session_id_length - * 9-10 challenge_length - * ... ... - */ - n=((p[0]&0x7f)<<8)|p[1]; - if (n > (1024*4)) - { - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_TOO_LARGE); - goto err; - } - if (n < 9) - { - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH); - goto err; - } - - j=ssl23_read_bytes(s,n+2); - /* We previously read 11 bytes, so if j > 0, we must have - * j == n+2 == s->packet_length. We have at least 11 valid - * packet bytes. */ - if (j <= 0) return(j); - - ssl3_finish_mac(s, s->packet+2, s->packet_length-2); - if (s->msg_callback) - s->msg_callback(0, SSL2_VERSION, 0, s->packet+2, s->packet_length-2, s, s->msg_callback_arg); /* CLIENT-HELLO */ - - p=s->packet; - p+=5; - n2s(p,csl); - n2s(p,sil); - n2s(p,cl); - d=(unsigned char *)s->init_buf->data; - if ((csl+sil+cl+11) != s->packet_length) /* We can't have TLS extensions in SSL 2.0 format - * Client Hello, can we? Error condition should be - * '>' otherweise */ - { - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_RECORD_LENGTH_MISMATCH); - goto err; - } - - /* record header: msg_type ... */ - *(d++) = SSL3_MT_CLIENT_HELLO; - /* ... and length (actual value will be written later) */ - d_len = d; - d += 3; - - /* client_version */ - *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */ - *(d++) = v[1]; - - /* lets populate the random area */ - /* get the challenge_length */ - i=(cl > SSL3_RANDOM_SIZE)?SSL3_RANDOM_SIZE:cl; - memset(d,0,SSL3_RANDOM_SIZE); - memcpy(&(d[SSL3_RANDOM_SIZE-i]),&(p[csl+sil]),i); - d+=SSL3_RANDOM_SIZE; - - /* no session-id reuse */ - *(d++)=0; - - /* ciphers */ - j=0; - dd=d; - d+=2; - for (i=0; i<csl; i+=3) - { - if (p[i] != 0) continue; - *(d++)=p[i+1]; - *(d++)=p[i+2]; - j+=2; - } - s2n(j,dd); - - /* COMPRESSION */ - *(d++)=1; - *(d++)=0; - + if (s->state == SSL23_ST_SR_CLNT_HELLO_B) { + /* + * we have SSLv3/TLSv1 in an SSLv2 header (other cases skip this + * state) + */ + + type = 2; + p = s->packet; + v[0] = p[3]; /* == SSL3_VERSION_MAJOR */ + v[1] = p[4]; + + /*- + * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2 + * header is sent directly on the wire, not wrapped as a TLS + * record. It's format is: + * Byte Content + * 0-1 msg_length + * 2 msg_type + * 3-4 version + * 5-6 cipher_spec_length + * 7-8 session_id_length + * 9-10 challenge_length + * ... ... + */ + n = ((p[0] & 0x7f) << 8) | p[1]; + if (n > (1024 * 4)) { + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_RECORD_TOO_LARGE); + goto err; + } + if (n < 9) { + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, + SSL_R_RECORD_LENGTH_MISMATCH); + goto err; + } + + j = ssl23_read_bytes(s, n + 2); + /* + * We previously read 11 bytes, so if j > 0, we must have j == n+2 == + * s->packet_length. We have at least 11 valid packet bytes. + */ + if (j <= 0) + return (j); + + ssl3_finish_mac(s, s->packet + 2, s->packet_length - 2); + + /* CLIENT-HELLO */ + if (s->msg_callback) + s->msg_callback(0, SSL2_VERSION, 0, s->packet + 2, + s->packet_length - 2, s, s->msg_callback_arg); + + p = s->packet; + p += 5; + n2s(p, csl); + n2s(p, sil); + n2s(p, cl); + d = (unsigned char *)s->init_buf->data; + if ((csl + sil + cl + 11) != s->packet_length) { /* We can't have TLS + * extensions in SSL + * 2.0 format * + * Client Hello, can + * we? Error + * condition should + * be * '>' + * otherweise */ + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, + SSL_R_RECORD_LENGTH_MISMATCH); + goto err; + } + + /* record header: msg_type ... */ + *(d++) = SSL3_MT_CLIENT_HELLO; + /* ... and length (actual value will be written later) */ + d_len = d; + d += 3; + + /* client_version */ + *(d++) = SSL3_VERSION_MAJOR; /* == v[0] */ + *(d++) = v[1]; + + /* lets populate the random area */ + /* get the challenge_length */ + i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl; + memset(d, 0, SSL3_RANDOM_SIZE); + memcpy(&(d[SSL3_RANDOM_SIZE - i]), &(p[csl + sil]), i); + d += SSL3_RANDOM_SIZE; + + /* no session-id reuse */ + *(d++) = 0; + + /* ciphers */ + j = 0; + dd = d; + d += 2; + for (i = 0; i < csl; i += 3) { + if (p[i] != 0) + continue; + *(d++) = p[i + 1]; + *(d++) = p[i + 2]; + j += 2; + } + s2n(j, dd); + + /* COMPRESSION */ + *(d++) = 1; + *(d++) = 0; + #if 0 - /* copy any remaining data with may be extensions */ - p = p+csl+sil+cl; - while (p < s->packet+s->packet_length) - { - *(d++)=*(p++); - } + /* copy any remaining data with may be extensions */ + p = p + csl + sil + cl; + while (p < s->packet + s->packet_length) { + *(d++) = *(p++); + } #endif - i = (d-(unsigned char *)s->init_buf->data) - 4; - l2n3((long)i, d_len); + i = (d - (unsigned char *)s->init_buf->data) - 4; + l2n3((long)i, d_len); - /* get the data reused from the init_buf */ - s->s3->tmp.reuse_message=1; - s->s3->tmp.message_type=SSL3_MT_CLIENT_HELLO; - s->s3->tmp.message_size=i; - } + /* get the data reused from the init_buf */ + s->s3->tmp.reuse_message = 1; + s->s3->tmp.message_type = SSL3_MT_CLIENT_HELLO; + s->s3->tmp.message_size = i; + } - /* imaginary new state (for program structure): */ - /* s->state = SSL23_SR_CLNT_HELLO_C */ + /* imaginary new state (for program structure): */ + /* s->state = SSL23_SR_CLNT_HELLO_C */ - if (type == 1) - { + if (type == 1) { #ifdef OPENSSL_NO_SSL2 - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); - goto err; + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); + goto err; #else - /* we are talking sslv2 */ - /* we need to clean up the SSLv3/TLSv1 setup and put in the - * sslv2 stuff. */ - - if (s->s2 == NULL) - { - if (!ssl2_new(s)) - goto err; - } - else - ssl2_clear(s); - - if (s->s3 != NULL) ssl3_free(s); - - if (!BUF_MEM_grow_clean(s->init_buf, - SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) - { - goto err; - } - - s->state=SSL2_ST_GET_CLIENT_HELLO_A; - if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3) - s->s2->ssl2_rollback=0; - else - /* reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0 - * (SSL 3.0 draft/RFC 2246, App. E.2) */ - s->s2->ssl2_rollback=1; - - /* setup the n bytes we have read so we get them from - * the sslv2 buffer */ - s->rstate=SSL_ST_READ_HEADER; - s->packet_length=n; - s->packet= &(s->s2->rbuf[0]); - memcpy(s->packet,buf,n); - s->s2->rbuf_left=n; - s->s2->rbuf_offs=0; - - s->method=SSLv2_server_method(); - s->handshake_func=s->method->ssl_accept; + /* we are talking sslv2 */ + /* + * we need to clean up the SSLv3/TLSv1 setup and put in the sslv2 + * stuff. + */ + + if (s->s2 == NULL) { + if (!ssl2_new(s)) + goto err; + } else + ssl2_clear(s); + + if (s->s3 != NULL) + ssl3_free(s); + + if (!BUF_MEM_grow_clean(s->init_buf, + SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { + goto err; + } + + s->state = SSL2_ST_GET_CLIENT_HELLO_A; + if (s->options & SSL_OP_NO_TLSv1 && s->options & SSL_OP_NO_SSLv3) + s->s2->ssl2_rollback = 0; + else + /* + * reject SSL 2.0 session if client supports SSL 3.0 or TLS 1.0 + * (SSL 3.0 draft/RFC 2246, App. E.2) + */ + s->s2->ssl2_rollback = 1; + + /* + * setup the n bytes we have read so we get them from the sslv2 + * buffer + */ + s->rstate = SSL_ST_READ_HEADER; + s->packet_length = n; + s->packet = &(s->s2->rbuf[0]); + memcpy(s->packet, buf, n); + s->s2->rbuf_left = n; + s->s2->rbuf_offs = 0; + + s->method = SSLv2_server_method(); + s->handshake_func = s->method->ssl_accept; #endif - } - - if ((type == 2) || (type == 3)) - { - /* we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) */ - const SSL_METHOD *new_method; - new_method = ssl23_get_server_method(s->version); - if (new_method == NULL) - { - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); - goto err; - } - s->method = new_method; - - if (!ssl_init_wbio_buffer(s,1)) goto err; - - /* we are in this state */ - s->state=SSL3_ST_SR_CLNT_HELLO_A; - - if (type == 3) - { - /* put the 'n' bytes we have read into the input buffer - * for SSLv3 */ - s->rstate=SSL_ST_READ_HEADER; - s->packet_length=n; - if (s->s3->rbuf.buf == NULL) - if (!ssl3_setup_read_buffer(s)) - goto err; - - s->packet= &(s->s3->rbuf.buf[0]); - memcpy(s->packet,buf,n); - s->s3->rbuf.left=n; - s->s3->rbuf.offset=0; - } - else - { - s->packet_length=0; - s->s3->rbuf.left=0; - s->s3->rbuf.offset=0; - } -#if 0 /* ssl3_get_client_hello does this */ - s->client_version=(v[0]<<8)|v[1]; + } + + if ((type == 2) || (type == 3)) { + /* + * we have SSLv3/TLSv1 (type 2: SSL2 style, type 3: SSL3/TLS style) + */ + const SSL_METHOD *new_method; + new_method = ssl23_get_server_method(s->version); + if (new_method == NULL) { + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); + goto err; + } + s->method = new_method; + + if (!ssl_init_wbio_buffer(s, 1)) + goto err; + + /* we are in this state */ + s->state = SSL3_ST_SR_CLNT_HELLO_A; + + if (type == 3) { + /* + * put the 'n' bytes we have read into the input buffer for SSLv3 + */ + s->rstate = SSL_ST_READ_HEADER; + s->packet_length = n; + if (s->s3->rbuf.buf == NULL) + if (!ssl3_setup_read_buffer(s)) + goto err; + + s->packet = &(s->s3->rbuf.buf[0]); + memcpy(s->packet, buf, n); + s->s3->rbuf.left = n; + s->s3->rbuf.offset = 0; + } else { + s->packet_length = 0; + s->s3->rbuf.left = 0; + s->s3->rbuf.offset = 0; + } +#if 0 /* ssl3_get_client_hello does this */ + s->client_version = (v[0] << 8) | v[1]; #endif - s->handshake_func=s->method->ssl_accept; - } - - if ((type < 1) || (type > 3)) - { - /* bad, very bad */ - SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO,SSL_R_UNKNOWN_PROTOCOL); - goto err; - } - s->init_num=0; - - if (buf != buf_space) OPENSSL_free(buf); - return(SSL_accept(s)); -err: - if (buf != buf_space) OPENSSL_free(buf); - return(-1); - } + s->handshake_func = s->method->ssl_accept; + } + + if ((type < 1) || (type > 3)) { + /* bad, very bad */ + SSLerr(SSL_F_SSL23_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL); + goto err; + } + s->init_num = 0; + + if (buf != buf_space) + OPENSSL_free(buf); + return (SSL_accept(s)); + err: + if (buf != buf_space) + OPENSSL_free(buf); + return (-1); +} |