X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=ssl%2Fs2_srvr.c;h=582420bcffb182570d083f4c2aef99312658cee2;hp=f8f1ba76d0d77220715f2adb4591b4e4f99667a8;hb=f11fd3f4e167531c80ca5e89119762e880e7121b;hpb=b1fe6ca175bdbb51a064c1e5519b21d80804e7c6 diff --git a/ssl/s2_srvr.c b/ssl/s2_srvr.c index f8f1ba76d0..582420bcff 100644 --- a/ssl/s2_srvr.c +++ b/ssl/s2_srvr.c @@ -55,13 +55,66 @@ * 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). + * + */ -#ifndef NO_RSA +#include "ssl_locl.h" +#ifndef OPENSSL_NO_SSL2 #include #include #include #include -#include "ssl_locl.h" #include static SSL_METHOD *ssl2_get_server_method(int ver); @@ -109,7 +162,7 @@ int ssl2_accept(SSL *s) void (*cb)()=NULL; int new_state,state; - RAND_seed(&l,sizeof(l)); + RAND_add(&l,sizeof(l),0); ERR_clear_error(); clear_sys_error(); @@ -119,8 +172,8 @@ int ssl2_accept(SSL *s) cb=s->ctx->info_callback; /* init things to blank */ - if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); s->in_handshake++; + if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); if (s->cert == NULL) { @@ -322,6 +375,7 @@ end: static int get_client_master_key(SSL *s) { int is_export,i,n,keya,ek; + unsigned long len; unsigned char *p; SSL_CIPHER *cp; const EVP_CIPHER *c; @@ -334,6 +388,8 @@ static int get_client_master_key(SSL *s) 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) @@ -362,15 +418,23 @@ static int get_client_master_key(SSL *s) n2s(p,i); s->s2->tmp.enc=i; n2s(p,i); s->session->key_arg_length=i; s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B; - s->init_num=0; } /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */ p=(unsigned char *)s->init_buf->data; keya=s->session->key_arg_length; - n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num; - i=ssl2_read(s,(char *)&(p[s->init_num]),n); + 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) + { + 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) + s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */ + p += 10; memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]), (unsigned int)keya); @@ -405,17 +469,18 @@ static int get_client_master_key(SSL *s) /* bad decrypt */ #if 1 /* If a bad decrypt, continue with protocol but with a - * dud master secret */ + * random master secret (Bleichenbacher attack) */ if ((i < 0) || ((!is_export && (i != EVP_CIPHER_key_length(c))) - || (is_export && ((i != ek) || (s->s2->tmp.clear+i != - EVP_CIPHER_key_length(c)))))) + || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i != + (unsigned int)EVP_CIPHER_key_length(c)))))) { + ERR_clear_error(); if (is_export) i=ek; else i=EVP_CIPHER_key_length(c); - RAND_bytes(p,i); + RAND_pseudo_bytes(p,i); } #else if (i < 0) @@ -447,9 +512,11 @@ static int get_client_master_key(SSL *s) 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 @@ -466,6 +533,7 @@ static int get_client_hello(SSL *s) 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) { @@ -490,15 +558,22 @@ static int get_client_hello(SSL *s) return(-1); } s->state=SSL2_ST_GET_CLIENT_HELLO_C; - s->init_num=0; } /* SSL2_ST_GET_CLIENT_HELLO_C */ p=(unsigned char *)s->init_buf->data; - n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+ - s->s2->tmp.session_id_length-s->init_num; - i=ssl2_read(s,(char *)&(p[s->init_num]),n); + 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) + { + 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) + s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */ + p += 9; /* get session-id before cipher stuff so we can get out session * structure if it is cached */ @@ -555,21 +630,37 @@ static int get_client_hello(SSL *s) &s->session->ciphers); if (cs == NULL) goto mem_err; - cl=ssl_get_ciphers_by_id(s); + cl=SSL_get_ciphers(s); - for (z=0; zoptions & SSL_OP_CIPHER_SERVER_PREFERENCE) + { + prio=sk_SSL_CIPHER_dup(cl); + if (prio == NULL) goto mem_err; + allow = cs; + } + else + { + prio = cs; + allow = cl; + } + for (z=0; zoptions & SSL_OP_CIPHER_SERVER_PREFERENCE) + { + sk_SSL_CIPHER_free(s->session->ciphers); + s->session->ciphers = prio; + } /* 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. + * 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; @@ -680,7 +771,7 @@ static int server_hello(SSL *s) /* make and send conn_id */ s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */ s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH; - RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length); + RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length); memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH); d+=SSL2_CONNECTION_ID_LENGTH; @@ -689,7 +780,7 @@ static int server_hello(SSL *s) s->init_off=0; } /* SSL2_ST_SEND_SERVER_HELLO_B */ - /* If we are using TCP/IP, the performace is bad if we do 2 + /* 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 */ @@ -704,7 +795,8 @@ static int server_hello(SSL *s) static int get_client_finished(SSL *s) { unsigned char *p; - int i; + int i, n; + unsigned long len; p=(unsigned char *)s->init_buf->data; if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A) @@ -712,6 +804,7 @@ static int get_client_finished(SSL *s) 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) { @@ -721,19 +814,28 @@ static int get_client_finished(SSL *s) 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->init_num=0; s->state=SSL2_ST_GET_CLIENT_FINISHED_B; } /* SSL2_ST_GET_CLIENT_FINISHED_B */ - i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num); - if (i < (int)s->s2->conn_id_length-s->init_num) + 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) + s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */ + p += 1; if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0) { ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR); @@ -789,6 +891,7 @@ static int request_certificate(SSL *s) 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; @@ -798,7 +901,7 @@ static int request_certificate(SSL *s) p=(unsigned char *)s->init_buf->data; *(p++)=SSL2_MT_REQUEST_CERTIFICATE; *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION; - RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH); + RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH); memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH); s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B; @@ -822,16 +925,31 @@ static int request_certificate(SSL *s) if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C) { p=(unsigned char *)s->init_buf->data; - i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); - if (i < 3) + i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */ + if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3 + * (probably NO-CERTIFICATE-ERROR) */ { ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i); goto end; } + s->init_num += i; - if ((*p == SSL2_MT_ERROR) && (i >= 3)) + 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) + s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */ + + /* 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); @@ -841,12 +959,18 @@ static int request_certificate(SSL *s) ret=1; goto end; } - if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6)) + 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++); @@ -859,18 +983,26 @@ static int request_certificate(SSL *s) n2s(p,i); s->s2->tmp.clen=i; n2s(p,i); s->s2->tmp.rlen=i; s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D; - s->init_num=0; } /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */ p=(unsigned char *)s->init_buf->data; - j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num; - i=ssl2_read(s,(char *)&(p[s->init_num]),j); + 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_GET_CLIENT_MASTER_KEY,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) + s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */ + p += 6; x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen); if (x509 == NULL) @@ -892,13 +1024,14 @@ static int request_certificate(SSL *s) EVP_MD_CTX ctx; EVP_PKEY *pkey=NULL; - EVP_VerifyInit(&ctx,s->ctx->rsa_md5); + EVP_MD_CTX_init(&ctx); + EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL); EVP_VerifyUpdate(&ctx,s->s2->key_material, (unsigned int)s->s2->key_material_length); EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH); i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL); - buf2=(unsigned char *)Malloc((unsigned int)i); + buf2=OPENSSL_malloc((unsigned int)i); if (buf2 == NULL) { SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE); @@ -907,13 +1040,13 @@ static int request_certificate(SSL *s) p2=buf2; i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2); EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i); - Free(buf2); + OPENSSL_free(buf2); pkey=X509_get_pubkey(x509); if (pkey == NULL) goto end; i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey); EVP_PKEY_free(pkey); - memset(&ctx,0,sizeof(ctx)); + EVP_MD_CTX_cleanup(&ctx); if (i) { @@ -966,4 +1099,10 @@ static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from, 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