- {
- int ssl_major,ssl_minor,al;
- int enc_err,n,i,ret= -1;
- SSL3_RECORD *rr;
- SSL_SESSION *sess;
- unsigned char *p;
- unsigned char md[EVP_MAX_MD_SIZE];
- short version;
- unsigned mac_size;
- size_t extra;
- unsigned empty_record_count = 0;
-
- rr= &(s->s3->rrec);
- sess=s->session;
-
- if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
- extra=SSL3_RT_MAX_EXTRA;
- else
- extra=0;
- if (extra && !s->s3->init_extra)
- {
- /* An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER
- * set after ssl3_setup_buffers() was done */
- SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
- return -1;
- }
-
-again:
- /* check if we have the header */
- if ( (s->rstate != SSL_ST_READ_BODY) ||
- (s->packet_length < SSL3_RT_HEADER_LENGTH))
- {
- n=ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
- if (n <= 0) return(n); /* error or non-blocking */
- s->rstate=SSL_ST_READ_BODY;
-
- p=s->packet;
- if (s->msg_callback)
- s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s, s->msg_callback_arg);
-
- /* Pull apart the header into the SSL3_RECORD */
- rr->type= *(p++);
- ssl_major= *(p++);
- ssl_minor= *(p++);
- version=(ssl_major<<8)|ssl_minor;
- n2s(p,rr->length);
-#if 0
-fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length);
-#endif
-
- /* Lets check version */
- if (!s->first_packet)
- {
- if (version != s->version)
- {
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
- if ((s->version & 0xFF00) == (version & 0xFF00) && !s->enc_write_ctx && !s->write_hash)
- /* Send back error using their minor version number :-) */
- s->version = (unsigned short)version;
- al=SSL_AD_PROTOCOL_VERSION;
- goto f_err;
- }
- }
-
- if ((version>>8) != SSL3_VERSION_MAJOR)
- {
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_WRONG_VERSION_NUMBER);
- goto err;
- }
-
- if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH)
- {
- al=SSL_AD_RECORD_OVERFLOW;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_PACKET_LENGTH_TOO_LONG);
- goto f_err;
- }
-
- /* now s->rstate == SSL_ST_READ_BODY */
- }
-
- /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
-
- if (rr->length > s->packet_length-SSL3_RT_HEADER_LENGTH)
- {
- /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
- i=rr->length;
- n=ssl3_read_n(s,i,i,1);
- if (n <= 0) return(n); /* error or non-blocking io */
- /* now n == rr->length,
- * and s->packet_length == SSL3_RT_HEADER_LENGTH + rr->length */
- }
-
- s->rstate=SSL_ST_READ_HEADER; /* set state for later operations */
-
- /* At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
- * and we have that many bytes in s->packet
- */
- rr->input= &(s->packet[SSL3_RT_HEADER_LENGTH]);
-
- /* ok, we can now read from 's->packet' data into 'rr'
- * rr->input points at rr->length bytes, which
- * need to be copied into rr->data by either
- * the decryption or by the decompression
- * When the data is 'copied' into the rr->data buffer,
- * rr->input will be pointed at the new buffer */
-
- /* We now have - encrypted [ MAC [ compressed [ plain ] ] ]
- * rr->length bytes of encrypted compressed stuff. */
-
- /* check is not needed I believe */
- if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH+extra)
- {
- al=SSL_AD_RECORD_OVERFLOW;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
- goto f_err;
- }
-
- /* decrypt in place in 'rr->input' */
- rr->data=rr->input;
- rr->orig_len=rr->length;
- /* If in encrypt-then-mac mode calculate mac from encrypted record.
- * All the details below are public so no timing details can leak.
- */
- if (SSL_USE_ETM(s) && s->read_hash)
- {
- unsigned char *mac;
- mac_size=EVP_MD_CTX_size(s->read_hash);
- OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
- if (rr->length < mac_size)
- {
- al=SSL_AD_DECODE_ERROR;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_LENGTH_TOO_SHORT);
- goto f_err;
- }
- rr->length -= mac_size;
- mac = rr->data + rr->length;
- i=s->method->ssl3_enc->mac(s,md,0 /* not send */);
- if (i < 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0)
- {
- al=SSL_AD_BAD_RECORD_MAC;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
- goto f_err;
- }
- }
-
- enc_err = s->method->ssl3_enc->enc(s,0);
- /* enc_err is:
- * 0: (in non-constant time) if the record is publically invalid.
- * 1: if the padding is valid
- * -1: if the padding is invalid */
- if (enc_err == 0)
- {
- al=SSL_AD_DECRYPTION_FAILED;
- SSLerr(SSL_F_SSL3_GET_RECORD,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
- goto f_err;
- }
-
+{
+ int ssl_major, ssl_minor, al;
+ int enc_err, n, i, ret = -1;
+ SSL3_RECORD *rr;
+ SSL_SESSION *sess;
+ unsigned char *p;
+ unsigned char md[EVP_MAX_MD_SIZE];
+ short version;
+ unsigned mac_size;
+ size_t extra;
+ unsigned empty_record_count = 0;
+
+ rr = &(s->s3->rrec);
+ sess = s->session;
+
+ if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
+ extra = SSL3_RT_MAX_EXTRA;
+ else
+ extra = 0;
+ if (extra && !s->s3->init_extra) {
+ /*
+ * An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER set after
+ * ssl3_setup_buffers() was done
+ */
+ SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR);
+ return -1;
+ }
+
+ again:
+ /* check if we have the header */
+ if ((s->rstate != SSL_ST_READ_BODY) ||
+ (s->packet_length < SSL3_RT_HEADER_LENGTH)) {
+ n = ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0);
+ if (n <= 0)
+ return (n); /* error or non-blocking */
+ s->rstate = SSL_ST_READ_BODY;
+
+ p = s->packet;
+ if (s->msg_callback)
+ s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s,
+ s->msg_callback_arg);
+
+ /* Pull apart the header into the SSL3_RECORD */
+ rr->type = *(p++);
+ ssl_major = *(p++);
+ ssl_minor = *(p++);
+ version = (ssl_major << 8) | ssl_minor;
+ n2s(p, rr->length);
+
+ /* Lets check version */
+ if (!s->first_packet) {
+ if (version != s->version) {
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);
+ if ((s->version & 0xFF00) == (version & 0xFF00)
+ && !s->enc_write_ctx && !s->write_hash)
+ /*
+ * Send back error using their minor version number :-)
+ */
+ s->version = (unsigned short)version;
+ al = SSL_AD_PROTOCOL_VERSION;
+ goto f_err;
+ }
+ }
+
+ if ((version >> 8) != SSL3_VERSION_MAJOR) {
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER);
+ goto err;
+ }
+
+ if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH) {
+ al = SSL_AD_RECORD_OVERFLOW;
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG);
+ goto f_err;
+ }
+
+ /* now s->rstate == SSL_ST_READ_BODY */
+ }
+
+ /* s->rstate == SSL_ST_READ_BODY, get and decode the data */
+
+ if (rr->length > s->packet_length - SSL3_RT_HEADER_LENGTH) {
+ /* now s->packet_length == SSL3_RT_HEADER_LENGTH */
+ i = rr->length;
+ n = ssl3_read_n(s, i, i, 1);
+ if (n <= 0)
+ return (n); /* error or non-blocking io */
+ /*
+ * now n == rr->length, and s->packet_length == SSL3_RT_HEADER_LENGTH
+ * + rr->length
+ */
+ }
+
+ s->rstate = SSL_ST_READ_HEADER; /* set state for later operations */
+
+ /*
+ * At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length,
+ * and we have that many bytes in s->packet
+ */
+ rr->input = &(s->packet[SSL3_RT_HEADER_LENGTH]);
+
+ /*
+ * ok, we can now read from 's->packet' data into 'rr' rr->input points
+ * at rr->length bytes, which need to be copied into rr->data by either
+ * the decryption or by the decompression When the data is 'copied' into
+ * the rr->data buffer, rr->input will be pointed at the new buffer
+ */
+
+ /*
+ * We now have - encrypted [ MAC [ compressed [ plain ] ] ] rr->length
+ * bytes of encrypted compressed stuff.
+ */
+
+ /* check is not needed I believe */
+ if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH + extra) {
+ al = SSL_AD_RECORD_OVERFLOW;
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG);
+ goto f_err;
+ }
+
+ /* decrypt in place in 'rr->input' */
+ rr->data = rr->input;
+ rr->orig_len = rr->length;
+ /*
+ * If in encrypt-then-mac mode calculate mac from encrypted record. All
+ * the details below are public so no timing details can leak.
+ */
+ if (SSL_USE_ETM(s) && s->read_hash) {
+ unsigned char *mac;
+ mac_size = EVP_MD_CTX_size(s->read_hash);
+ OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE);
+ if (rr->length < mac_size) {
+ al = SSL_AD_DECODE_ERROR;
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT);
+ goto f_err;
+ }
+ rr->length -= mac_size;
+ mac = rr->data + rr->length;
+ i = s->method->ssl3_enc->mac(s, md, 0 /* not send */ );
+ if (i < 0 || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) {
+ al = SSL_AD_BAD_RECORD_MAC;
+ SSLerr(SSL_F_SSL3_GET_RECORD,
+ SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC);
+ goto f_err;
+ }
+ }
+
+ enc_err = s->method->ssl3_enc->enc(s, 0);
+ /*-
+ * enc_err is:
+ * 0: (in non-constant time) if the record is publically invalid.
+ * 1: if the padding is valid
+ * -1: if the padding is invalid
+ */
+ if (enc_err == 0) {
+ al = SSL_AD_DECRYPTION_FAILED;
+ SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
+ goto f_err;
+ }