diff options
author | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:21:41 -0700 |
---|---|---|
committer | Ashlee Young <ashlee@onosfw.com> | 2015-09-09 22:21:41 -0700 |
commit | 8879b125d26e8db1a5633de5a9c692eb2d1c4f83 (patch) | |
tree | c7259d85a991b83dfa85ab2e339360669fc1f58e /framework/src/suricata/src/app-layer-htp-body.c | |
parent | 13d05bc8458758ee39cb829098241e89616717ee (diff) |
suricata checkin based on commit id a4bce14770beee46a537eda3c3f6e8e8565d5d0a
Change-Id: I9a214fa0ee95e58fc640e50bd604dac7f42db48f
Diffstat (limited to 'framework/src/suricata/src/app-layer-htp-body.c')
-rw-r--r-- | framework/src/suricata/src/app-layer-htp-body.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/framework/src/suricata/src/app-layer-htp-body.c b/framework/src/suricata/src/app-layer-htp-body.c new file mode 100644 index 00000000..6454fe1c --- /dev/null +++ b/framework/src/suricata/src/app-layer-htp-body.c @@ -0,0 +1,264 @@ +/* Copyright (C) 2007-2011 Open Information Security Foundation + * + * You can copy, redistribute or modify this Program under the terms of + * the GNU General Public License version 2 as published by the Free + * Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/** + * \file + * + * \author Victor Julien <victor@inliniac.net> + * \author Gurvinder Singh <gurvindersinghdahiya@gmail.com> + * \author Pablo Rincon <pablo.rincon.crespo@gmail.com> + * \author Brian Rectanus <brectanu@gmail.com> + * + * This file provides a HTTP protocol support for the engine using HTP library. + */ + +#include "suricata.h" +#include "suricata-common.h" +#include "debug.h" +#include "decode.h" +#include "threads.h" + +#include "util-print.h" +#include "util-pool.h" +#include "util-radix-tree.h" + +#include "stream-tcp-private.h" +#include "stream-tcp-reassemble.h" +#include "stream-tcp.h" +#include "stream.h" + +#include "app-layer-protos.h" +#include "app-layer-parser.h" +#include "app-layer-htp.h" + +#include "util-spm.h" +#include "util-debug.h" +#include "app-layer-htp.h" +#include "app-layer-htp-file.h" +#include "util-time.h" + +#include "util-unittest.h" +#include "util-unittest-helper.h" +#include "flow-util.h" + +#include "detect-engine.h" +#include "detect-engine-state.h" +#include "detect-parse.h" + +#include "conf.h" + +#include "util-memcmp.h" + +/** + * \brief Append a chunk of body to the HtpBody struct + * + * \param body pointer to the HtpBody holding the list + * \param data pointer to the data of the chunk + * \param len length of the chunk pointed by data + * + * \retval 0 ok + * \retval -1 error + */ +int HtpBodyAppendChunk(HtpTxUserData *htud, HtpBody *body, uint8_t *data, uint32_t len) +{ + SCEnter(); + + HtpBodyChunk *bd = NULL; + + if (len == 0 || data == NULL) { + SCReturnInt(0); + } + + if (body->first == NULL) { + /* New chunk */ + bd = (HtpBodyChunk *)HTPMalloc(sizeof(HtpBodyChunk)); + if (bd == NULL) + goto error; + + bd->len = len; + bd->stream_offset = 0; + bd->next = NULL; + bd->logged = 0; + + bd->data = HTPMalloc(len); + if (bd->data == NULL) { + goto error; + } + memcpy(bd->data, data, len); + + body->first = body->last = bd; + + body->content_len_so_far = len; + } else { + bd = (HtpBodyChunk *)HTPMalloc(sizeof(HtpBodyChunk)); + if (bd == NULL) + goto error; + + bd->len = len; + bd->stream_offset = body->content_len_so_far; + bd->next = NULL; + bd->logged = 0; + + bd->data = HTPMalloc(len); + if (bd->data == NULL) { + goto error; + } + memcpy(bd->data, data, len); + + body->last->next = bd; + body->last = bd; + + body->content_len_so_far += len; + } + SCLogDebug("Body %p; data %p, len %"PRIu32, body, bd->data, (uint32_t)bd->len); + + SCReturnInt(0); + +error: + if (bd != NULL) { + if (bd->data != NULL) { + HTPFree(bd->data, bd->len); + } + HTPFree(bd, sizeof(HtpBodyChunk)); + } + SCReturnInt(-1); +} + +/** + * \brief Print the information and chunks of a Body + * \param body pointer to the HtpBody holding the list + * \retval none + */ +void HtpBodyPrint(HtpBody *body) +{ + if (SCLogDebugEnabled()||1) { + SCEnter(); + + if (body->first == NULL) + return; + + HtpBodyChunk *cur = NULL; + SCLogDebug("--- Start body chunks at %p ---", body); + printf("--- Start body chunks at %p ---\n", body); + for (cur = body->first; cur != NULL; cur = cur->next) { + SCLogDebug("Body %p; data %p, len %"PRIu32, body, cur->data, (uint32_t)cur->len); + printf("Body %p; data %p, len %"PRIu32"\n", body, cur->data, (uint32_t)cur->len); + PrintRawDataFp(stdout, (uint8_t*)cur->data, cur->len); + } + SCLogDebug("--- End body chunks at %p ---", body); + } +} + +/** + * \brief Free the information held in the request body + * \param body pointer to the HtpBody holding the list + * \retval none + */ +void HtpBodyFree(HtpBody *body) +{ + SCEnter(); + + if (body->first == NULL) + return; + + SCLogDebug("Removing chunks of Body %p; data %p, len %"PRIu32, body, + body->last->data, (uint32_t)body->last->len); + + HtpBodyChunk *cur = NULL; + HtpBodyChunk *prev = NULL; + + prev = body->first; + while (prev != NULL) { + cur = prev->next; + if (prev->data != NULL) + HTPFree(prev->data, prev->len); + HTPFree(prev, sizeof(HtpBodyChunk)); + prev = cur; + } + body->first = body->last = NULL; +} + +/** + * \brief Free request body chunks that are already fully parsed. + * + * \param state htp_state, with reference to our config + * \param body the body to prune + * \param direction STREAM_TOSERVER (request), STREAM_TOCLIENT (response) + * + * \retval none + */ +void HtpBodyPrune(HtpState *state, HtpBody *body, int direction) +{ + SCEnter(); + + if (body == NULL || body->first == NULL) { + SCReturn; + } + + if (body->body_parsed == 0) { + SCReturn; + } + + /* get the configured inspect sizes. Default to response values */ + uint32_t min_size = state->cfg->response_inspect_min_size; + uint32_t window = state->cfg->response_inspect_window; + + if (direction == STREAM_TOSERVER) { + min_size = state->cfg->request_inspect_min_size; + window = state->cfg->request_inspect_window; + } + + if (body->body_inspected < (min_size > window) ? min_size : window) { + SCReturn; + } + + SCLogDebug("Pruning chunks of Body %p; data %p, len %"PRIu32, body, + body->last->data, (uint32_t)body->last->len); + + HtpBodyChunk *cur = body->first; + while (cur != NULL) { + HtpBodyChunk *next = cur->next; + + SCLogDebug("cur->stream_offset %"PRIu64" + cur->len %u = %"PRIu64", " + "body->body_parsed %"PRIu64, cur->stream_offset, cur->len, + cur->stream_offset + cur->len, body->body_parsed); + + uint64_t left_edge = body->body_inspected; + if (left_edge <= min_size || left_edge <= window) + left_edge = 0; + if (left_edge) + left_edge -= window; + + if (cur->stream_offset + cur->len > left_edge) { + break; + } + + body->first = next; + if (body->last == cur) { + body->last = next; + } + + if (cur->data != NULL) { + HTPFree(cur->data, cur->len); + } + HTPFree(cur, sizeof(HtpBodyChunk)); + + cur = next; + } + + SCReturn; +} |