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https://github.com/classilla/tenfourfox.git
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456 lines
14 KiB
C
456 lines
14 KiB
C
/*
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* Gather (Read) entire SSL3 records from socket into buffer.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "cert.h"
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#include "ssl.h"
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#include "sslimpl.h"
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#include "ssl3prot.h"
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/*
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* Attempt to read in an entire SSL3 record.
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* Blocks here for blocking sockets, otherwise returns -1 with
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* PR_WOULD_BLOCK_ERROR when socket would block.
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*
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* returns 1 if received a complete SSL3 record.
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* returns 0 if recv returns EOF
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* returns -1 if recv returns < 0
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* (The error value may have already been set to PR_WOULD_BLOCK_ERROR)
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*
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* Caller must hold the recv buf lock.
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*
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* The Gather state machine has 3 states: GS_INIT, GS_HEADER, GS_DATA.
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* GS_HEADER: waiting for the 5-byte SSL3 record header to come in.
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* GS_DATA: waiting for the body of the SSL3 record to come in.
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*
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* This loop returns when either
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* (a) an error or EOF occurs,
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* (b) PR_WOULD_BLOCK_ERROR,
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* (c) data (entire SSL3 record) has been received.
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*/
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static int
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ssl3_GatherData(sslSocket *ss, sslGather *gs, int flags)
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{
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unsigned char *bp;
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unsigned char *lbp;
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int nb;
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int err;
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int rv = 1;
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PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
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if (gs->state == GS_INIT) {
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gs->state = GS_HEADER;
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gs->remainder = 5;
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gs->offset = 0;
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gs->writeOffset = 0;
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gs->readOffset = 0;
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gs->inbuf.len = 0;
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}
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lbp = gs->inbuf.buf;
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for(;;) {
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SSL_TRC(30, ("%d: SSL3[%d]: gather state %d (need %d more)",
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SSL_GETPID(), ss->fd, gs->state, gs->remainder));
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bp = ((gs->state != GS_HEADER) ? lbp : gs->hdr) + gs->offset;
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nb = ssl_DefRecv(ss, bp, gs->remainder, flags);
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if (nb > 0) {
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PRINT_BUF(60, (ss, "raw gather data:", bp, nb));
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} else if (nb == 0) {
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/* EOF */
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SSL_TRC(30, ("%d: SSL3[%d]: EOF", SSL_GETPID(), ss->fd));
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rv = 0;
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break;
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} else /* if (nb < 0) */ {
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SSL_DBG(("%d: SSL3[%d]: recv error %d", SSL_GETPID(), ss->fd,
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PR_GetError()));
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rv = SECFailure;
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break;
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}
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PORT_Assert( (unsigned int)nb <= gs->remainder );
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if ((unsigned int)nb > gs->remainder) {
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/* ssl_DefRecv is misbehaving! this error is fatal to SSL. */
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gs->state = GS_INIT; /* so we don't crash next time */
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rv = SECFailure;
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break;
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}
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gs->offset += nb;
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gs->remainder -= nb;
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if (gs->state == GS_DATA)
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gs->inbuf.len += nb;
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/* if there's more to go, read some more. */
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if (gs->remainder > 0) {
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continue;
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}
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/* have received entire record header, or entire record. */
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switch (gs->state) {
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case GS_HEADER:
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/*
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** Have received SSL3 record header in gs->hdr.
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** Now extract the length of the following encrypted data,
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** and then read in the rest of the SSL3 record into gs->inbuf.
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*/
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gs->remainder = (gs->hdr[3] << 8) | gs->hdr[4];
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/* This is the max fragment length for an encrypted fragment
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** plus the size of the record header.
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*/
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if(gs->remainder > (MAX_FRAGMENT_LENGTH + 2048 + 5)) {
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SSL3_SendAlert(ss, alert_fatal, unexpected_message);
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gs->state = GS_INIT;
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PORT_SetError(SSL_ERROR_RX_RECORD_TOO_LONG);
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return SECFailure;
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}
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gs->state = GS_DATA;
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gs->offset = 0;
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gs->inbuf.len = 0;
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if (gs->remainder > gs->inbuf.space) {
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err = sslBuffer_Grow(&gs->inbuf, gs->remainder);
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if (err) { /* realloc has set error code to no mem. */
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return err;
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}
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lbp = gs->inbuf.buf;
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}
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break; /* End this case. Continue around the loop. */
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case GS_DATA:
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/*
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** SSL3 record has been completely received.
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*/
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gs->state = GS_INIT;
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return 1;
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}
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}
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return rv;
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}
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/*
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* Read in an entire DTLS record.
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*
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* Blocks here for blocking sockets, otherwise returns -1 with
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* PR_WOULD_BLOCK_ERROR when socket would block.
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*
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* This is simpler than SSL because we are reading on a datagram socket
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* and datagrams must contain >=1 complete records.
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*
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* returns 1 if received a complete DTLS record.
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* returns 0 if recv returns EOF
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* returns -1 if recv returns < 0
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* (The error value may have already been set to PR_WOULD_BLOCK_ERROR)
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*
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* Caller must hold the recv buf lock.
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*
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* This loop returns when either
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* (a) an error or EOF occurs,
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* (b) PR_WOULD_BLOCK_ERROR,
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* (c) data (entire DTLS record) has been received.
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*/
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static int
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dtls_GatherData(sslSocket *ss, sslGather *gs, int flags)
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{
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int nb;
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int err;
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int rv = 1;
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SSL_TRC(30, ("dtls_GatherData"));
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PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
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gs->state = GS_HEADER;
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gs->offset = 0;
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if (gs->dtlsPacketOffset == gs->dtlsPacket.len) { /* No data left */
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gs->dtlsPacketOffset = 0;
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gs->dtlsPacket.len = 0;
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/* Resize to the maximum possible size so we can fit a full datagram */
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/* This is the max fragment length for an encrypted fragment
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** plus the size of the record header.
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** This magic constant is copied from ssl3_GatherData, with 5 changed
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** to 13 (the size of the record header).
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*/
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if (gs->dtlsPacket.space < MAX_FRAGMENT_LENGTH + 2048 + 13) {
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err = sslBuffer_Grow(&gs->dtlsPacket,
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MAX_FRAGMENT_LENGTH + 2048 + 13);
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if (err) { /* realloc has set error code to no mem. */
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return err;
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}
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}
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/* recv() needs to read a full datagram at a time */
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nb = ssl_DefRecv(ss, gs->dtlsPacket.buf, gs->dtlsPacket.space, flags);
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if (nb > 0) {
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PRINT_BUF(60, (ss, "raw gather data:", gs->dtlsPacket.buf, nb));
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} else if (nb == 0) {
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/* EOF */
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SSL_TRC(30, ("%d: SSL3[%d]: EOF", SSL_GETPID(), ss->fd));
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rv = 0;
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return rv;
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} else /* if (nb < 0) */ {
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SSL_DBG(("%d: SSL3[%d]: recv error %d", SSL_GETPID(), ss->fd,
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PR_GetError()));
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rv = SECFailure;
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return rv;
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}
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gs->dtlsPacket.len = nb;
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}
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/* At this point we should have >=1 complete records lined up in
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* dtlsPacket. Read off the header.
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*/
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if ((gs->dtlsPacket.len - gs->dtlsPacketOffset) < 13) {
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SSL_DBG(("%d: SSL3[%d]: rest of DTLS packet "
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"too short to contain header", SSL_GETPID(), ss->fd));
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PR_SetError(PR_WOULD_BLOCK_ERROR, 0);
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gs->dtlsPacketOffset = 0;
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gs->dtlsPacket.len = 0;
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rv = SECFailure;
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return rv;
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}
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memcpy(gs->hdr, gs->dtlsPacket.buf + gs->dtlsPacketOffset, 13);
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gs->dtlsPacketOffset += 13;
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/* Have received SSL3 record header in gs->hdr. */
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gs->remainder = (gs->hdr[11] << 8) | gs->hdr[12];
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if ((gs->dtlsPacket.len - gs->dtlsPacketOffset) < gs->remainder) {
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SSL_DBG(("%d: SSL3[%d]: rest of DTLS packet too short "
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"to contain rest of body", SSL_GETPID(), ss->fd));
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PR_SetError(PR_WOULD_BLOCK_ERROR, 0);
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gs->dtlsPacketOffset = 0;
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gs->dtlsPacket.len = 0;
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rv = SECFailure;
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return rv;
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}
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/* OK, we have at least one complete packet, copy into inbuf */
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if (gs->remainder > gs->inbuf.space) {
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err = sslBuffer_Grow(&gs->inbuf, gs->remainder);
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if (err) { /* realloc has set error code to no mem. */
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return err;
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}
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}
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memcpy(gs->inbuf.buf, gs->dtlsPacket.buf + gs->dtlsPacketOffset,
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gs->remainder);
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gs->inbuf.len = gs->remainder;
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gs->offset = gs->remainder;
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gs->dtlsPacketOffset += gs->remainder;
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gs->state = GS_INIT;
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return 1;
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}
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/* Gather in a record and when complete, Handle that record.
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* Repeat this until the handshake is complete,
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* or until application data is available.
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*
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* Returns 1 when the handshake is completed without error, or
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* application data is available.
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* Returns 0 if ssl3_GatherData hits EOF.
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* Returns -1 on read error, or PR_WOULD_BLOCK_ERROR, or handleRecord error.
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* Returns -2 on SECWouldBlock return from ssl3_HandleRecord.
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*
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* Called from ssl_GatherRecord1stHandshake in sslcon.c,
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* and from SSL_ForceHandshake in sslsecur.c
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* and from ssl3_GatherAppDataRecord below (<- DoRecv in sslsecur.c).
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*
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* Caller must hold the recv buf lock.
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*/
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int
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ssl3_GatherCompleteHandshake(sslSocket *ss, int flags)
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{
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SSL3Ciphertext cText;
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int rv;
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PRBool keepGoing = PR_TRUE;
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SSL_TRC(30, ("ssl3_GatherCompleteHandshake"));
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/* ssl3_HandleRecord may end up eventually calling ssl_FinishHandshake,
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* which requires the 1stHandshakeLock, which must be acquired before the
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* RecvBufLock.
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*/
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PORT_Assert( ss->opt.noLocks || ssl_Have1stHandshakeLock(ss) );
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PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
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do {
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PRBool handleRecordNow = PR_FALSE;
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ssl_GetSSL3HandshakeLock(ss);
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/* Without this, we may end up wrongly reporting
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* SSL_ERROR_RX_UNEXPECTED_* errors if we receive any records from the
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* peer while we are waiting to be restarted.
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*/
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if (ss->ssl3.hs.restartTarget) {
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ssl_ReleaseSSL3HandshakeLock(ss);
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PORT_SetError(PR_WOULD_BLOCK_ERROR);
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return (int) SECFailure;
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}
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/* Treat an empty msgState like a NULL msgState. (Most of the time
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* when ssl3_HandleHandshake returns SECWouldBlock, it leaves
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* behind a non-NULL but zero-length msgState).
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* Test: async_cert_restart_server_sends_hello_request_first_in_separate_record
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*/
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if (ss->ssl3.hs.msgState.buf) {
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if (ss->ssl3.hs.msgState.len == 0) {
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ss->ssl3.hs.msgState.buf = NULL;
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} else {
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handleRecordNow = PR_TRUE;
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}
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}
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ssl_ReleaseSSL3HandshakeLock(ss);
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if (handleRecordNow) {
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/* ssl3_HandleHandshake previously returned SECWouldBlock and the
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* as-yet-unprocessed plaintext of that previous handshake record.
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* We need to process it now before we overwrite it with the next
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* handshake record.
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*/
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rv = ssl3_HandleRecord(ss, NULL, &ss->gs.buf);
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} else {
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/* bring in the next sslv3 record. */
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if (ss->recvdCloseNotify) {
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/* RFC 5246 Section 7.2.1:
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* Any data received after a closure alert is ignored.
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*/
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return 0;
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}
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if (!IS_DTLS(ss)) {
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rv = ssl3_GatherData(ss, &ss->gs, flags);
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} else {
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rv = dtls_GatherData(ss, &ss->gs, flags);
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/* If we got a would block error, that means that no data was
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* available, so we check the timer to see if it's time to
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* retransmit */
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if (rv == SECFailure &&
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(PORT_GetError() == PR_WOULD_BLOCK_ERROR)) {
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ssl_GetSSL3HandshakeLock(ss);
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dtls_CheckTimer(ss);
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ssl_ReleaseSSL3HandshakeLock(ss);
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/* Restore the error in case something succeeded */
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PORT_SetError(PR_WOULD_BLOCK_ERROR);
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}
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}
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if (rv <= 0) {
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return rv;
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}
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/* decipher it, and handle it if it's a handshake.
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* If it's application data, ss->gs.buf will not be empty upon return.
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* If it's a change cipher spec, alert, or handshake message,
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* ss->gs.buf.len will be 0 when ssl3_HandleRecord returns SECSuccess.
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*/
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cText.type = (SSL3ContentType)ss->gs.hdr[0];
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cText.version = (ss->gs.hdr[1] << 8) | ss->gs.hdr[2];
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if (IS_DTLS(ss)) {
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int i;
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cText.version = dtls_DTLSVersionToTLSVersion(cText.version);
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/* DTLS sequence number */
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cText.seq_num.high = 0; cText.seq_num.low = 0;
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for (i = 0; i < 4; i++) {
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cText.seq_num.high <<= 8; cText.seq_num.low <<= 8;
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cText.seq_num.high |= ss->gs.hdr[3 + i];
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cText.seq_num.low |= ss->gs.hdr[7 + i];
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}
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}
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cText.buf = &ss->gs.inbuf;
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rv = ssl3_HandleRecord(ss, &cText, &ss->gs.buf);
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}
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if (rv < 0) {
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return ss->recvdCloseNotify ? 0 : rv;
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}
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if (ss->gs.buf.len > 0) {
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/* We have application data to return to the application. This
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* prioritizes returning application data to the application over
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* completing any renegotiation handshake we may be doing.
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*/
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PORT_Assert(ss->firstHsDone);
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PORT_Assert(cText.type == content_application_data);
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break;
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}
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PORT_Assert(keepGoing);
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ssl_GetSSL3HandshakeLock(ss);
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if (ss->ssl3.hs.ws == idle_handshake) {
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/* We are done with the current handshake so stop trying to
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* handshake. Note that it would be safe to test ss->firstHsDone
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* instead of ss->ssl3.hs.ws. By testing ss->ssl3.hs.ws instead,
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* we prioritize completing a renegotiation handshake over sending
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* application data.
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*/
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PORT_Assert(ss->firstHsDone);
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PORT_Assert(!ss->ssl3.hs.canFalseStart);
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keepGoing = PR_FALSE;
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} else if (ss->ssl3.hs.canFalseStart) {
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/* Prioritize sending application data over trying to complete
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* the handshake if we're false starting.
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*
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* If we were to do this check at the beginning of the loop instead
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* of here, then this function would become be a no-op after
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* receiving the ServerHelloDone in the false start case, and we
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* would never complete the handshake.
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*/
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PORT_Assert(!ss->firstHsDone);
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if (ssl3_WaitingForStartOfServerSecondRound(ss)) {
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keepGoing = PR_FALSE;
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} else {
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ss->ssl3.hs.canFalseStart = PR_FALSE;
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}
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}
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ssl_ReleaseSSL3HandshakeLock(ss);
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} while (keepGoing);
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ss->gs.readOffset = 0;
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ss->gs.writeOffset = ss->gs.buf.len;
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return 1;
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}
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/* Repeatedly gather in a record and when complete, Handle that record.
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* Repeat this until some application data is received.
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*
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* Returns 1 when application data is available.
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* Returns 0 if ssl3_GatherData hits EOF.
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* Returns -1 on read error, or PR_WOULD_BLOCK_ERROR, or handleRecord error.
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* Returns -2 on SECWouldBlock return from ssl3_HandleRecord.
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*
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* Called from DoRecv in sslsecur.c
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* Caller must hold the recv buf lock.
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*/
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int
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ssl3_GatherAppDataRecord(sslSocket *ss, int flags)
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{
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int rv;
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/* ssl3_GatherCompleteHandshake requires both of these locks. */
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PORT_Assert( ss->opt.noLocks || ssl_Have1stHandshakeLock(ss) );
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PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
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do {
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rv = ssl3_GatherCompleteHandshake(ss, flags);
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} while (rv > 0 && ss->gs.buf.len == 0);
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return rv;
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}
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