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Diffstat (limited to 'framework/src/suricata/src/detect-engine-filedata-smtp.c')
-rw-r--r--framework/src/suricata/src/detect-engine-filedata-smtp.c562
1 files changed, 0 insertions, 562 deletions
diff --git a/framework/src/suricata/src/detect-engine-filedata-smtp.c b/framework/src/suricata/src/detect-engine-filedata-smtp.c
deleted file mode 100644
index 829832f9..00000000
--- a/framework/src/suricata/src/detect-engine-filedata-smtp.c
+++ /dev/null
@@ -1,562 +0,0 @@
-/* Copyright (C) 2015 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 Giuseppe Longo <giuseppelng@gmail.com>
- *
- */
-
-#include "suricata-common.h"
-#include "suricata.h"
-#include "decode.h"
-
-#include "detect.h"
-#include "detect-engine.h"
-#include "detect-engine-mpm.h"
-#include "detect-parse.h"
-#include "detect-engine-state.h"
-#include "detect-engine-content-inspection.h"
-
-#include "flow-util.h"
-#include "util-debug.h"
-#include "util-print.h"
-#include "flow.h"
-
-#include "stream-tcp.h"
-
-#include "app-layer-parser.h"
-
-#include "util-unittest.h"
-#include "util-unittest-helper.h"
-#include "app-layer.h"
-#include "app-layer-smtp.h"
-#include "app-layer-protos.h"
-#include "app-layer-parser.h"
-
-#include "conf.h"
-#include "conf-yaml-loader.h"
-
-#define BUFFER_STEP 50
-
-static inline int SMTPCreateSpace(DetectEngineThreadCtx *det_ctx, uint16_t size)
-{
- void *ptmp;
- if (size > det_ctx->smtp_buffers_size) {
- ptmp = SCRealloc(det_ctx->smtp,
- (det_ctx->smtp_buffers_size + BUFFER_STEP) * sizeof(FiledataReassembledBody));
- if (ptmp == NULL) {
- SCFree(det_ctx->smtp);
- det_ctx->smtp = NULL;
- det_ctx->smtp_buffers_size = 0;
- det_ctx->smtp_buffers_list_len = 0;
- return -1;
- }
- det_ctx->smtp = ptmp;
-
- memset(det_ctx->smtp + det_ctx->smtp_buffers_size, 0, BUFFER_STEP * sizeof(FiledataReassembledBody));
- det_ctx->smtp_buffers_size += BUFFER_STEP;
- }
- for (int i = det_ctx->smtp_buffers_list_len; i < (size); i++) {
- det_ctx->smtp[i].buffer_len = 0;
- det_ctx->smtp[i].offset = 0;
- }
-
- return 0;
-}
-
-static uint8_t *DetectEngineSMTPGetBufferForTX(uint64_t tx_id,
- DetectEngineCtx *de_ctx,
- DetectEngineThreadCtx *det_ctx,
- Flow *f, File *curr_file,
- uint8_t flags,
- uint32_t *buffer_len,
- uint32_t *stream_start_offset)
-{
- int index = 0;
- uint8_t *buffer = NULL;
- *buffer_len = 0;
- *stream_start_offset = 0;
- FileData *curr_chunk = NULL;
-
- if (det_ctx->smtp_buffers_list_len == 0) {
- if (SMTPCreateSpace(det_ctx, 1) < 0)
- goto end;
- index = 0;
-
- if (det_ctx->smtp_buffers_list_len == 0) {
- det_ctx->smtp_start_tx_id = tx_id;
- }
- det_ctx->smtp_buffers_list_len++;
- } else {
- if ((tx_id - det_ctx->smtp_start_tx_id) < det_ctx->smtp_buffers_list_len) {
- if (det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].buffer_len != 0) {
- *buffer_len = det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].buffer_len;
- *stream_start_offset = det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].offset;
- return det_ctx->smtp[(tx_id - det_ctx->smtp_start_tx_id)].buffer;
- }
- } else {
- if (SMTPCreateSpace(det_ctx, (tx_id - det_ctx->smtp_start_tx_id) + 1) < 0)
- goto end;
-
- if (det_ctx->smtp_buffers_list_len == 0) {
- det_ctx->smtp_start_tx_id = tx_id;
- }
- det_ctx->smtp_buffers_list_len++;
- }
- index = (tx_id - det_ctx->smtp_start_tx_id);
- }
-
- /* no new data */
- if (curr_file->content_inspected == curr_file->content_len_so_far) {
- SCLogDebug("no new data");
- goto end;
- }
-
- curr_chunk = curr_file->chunks_head;
- if (curr_chunk == NULL) {
- SCLogDebug("no data chunks to inspect for this transaction");
- goto end;
- }
-
- if ((smtp_config.content_limit == 0 ||
- curr_file->content_len_so_far < smtp_config.content_limit) &&
- curr_file->content_len_so_far < smtp_config.content_inspect_min_size &&
- !(flags & STREAM_EOF)) {
- SCLogDebug("we still haven't seen the entire content. "
- "Let's defer content inspection till we see the "
- "entire content.");
- goto end;
- }
-
- int first = 1;
- curr_chunk = curr_file->chunks_head;
- while (curr_chunk != NULL) {
- /* see if we can filter out chunks */
- if (curr_file->content_inspected > 0) {
- if (curr_chunk->stream_offset < curr_file->content_inspected) {
- if ((curr_file->content_inspected - curr_chunk->stream_offset) > smtp_config.content_inspect_window) {
- curr_chunk = curr_chunk->next;
- continue;
- } else {
- /* include this one */
- }
- } else {
- /* include this one */
- }
- }
-
- if (first) {
- det_ctx->smtp[index].offset = curr_chunk->stream_offset;
- first = 0;
- }
-
- /* see if we need to grow the buffer */
- if (det_ctx->smtp[index].buffer == NULL || (det_ctx->smtp[index].buffer_len + curr_chunk->len) > det_ctx->smtp[index].buffer_size) {
- void *ptmp;
- det_ctx->smtp[index].buffer_size += curr_chunk->len * 2;
-
- if ((ptmp = SCRealloc(det_ctx->smtp[index].buffer, det_ctx->smtp[index].buffer_size)) == NULL) {
- SCFree(det_ctx->smtp[index].buffer);
- det_ctx->smtp[index].buffer = NULL;
- det_ctx->smtp[index].buffer_size = 0;
- det_ctx->smtp[index].buffer_len = 0;
- goto end;
- }
- det_ctx->smtp[index].buffer = ptmp;
- }
- memcpy(det_ctx->smtp[index].buffer + det_ctx->smtp[index].buffer_len, curr_chunk->data, curr_chunk->len);
- det_ctx->smtp[index].buffer_len += curr_chunk->len;
-
- curr_chunk = curr_chunk->next;
- }
-
- /* updat inspected tracker */
- curr_file->content_inspected = curr_file->chunks_tail->stream_offset + curr_file->chunks_tail->len;
-
- buffer = det_ctx->smtp[index].buffer;
- *buffer_len = det_ctx->smtp[index].buffer_len;
- *stream_start_offset = det_ctx->smtp[index].offset;
-end:
- return buffer;
-}
-
-int DetectEngineInspectSMTPFiledata(ThreadVars *tv,
- DetectEngineCtx *de_ctx,
- DetectEngineThreadCtx *det_ctx,
- Signature *s, Flow *f, uint8_t flags,
- void *alstate,
- void *tx, uint64_t tx_id)
-{
- SMTPState *smtp_state = (SMTPState *)alstate;
- FileContainer *ffc = smtp_state->files_ts;
- int r = 0;
- int match = 0;
- uint32_t buffer_len = 0;
- uint32_t stream_start_offset = 0;
- uint8_t *buffer = 0;
-
- if (ffc != NULL) {
- File *file = ffc->head;
- for (; file != NULL; file = file->next) {
- buffer = DetectEngineSMTPGetBufferForTX(tx_id,
- de_ctx, det_ctx,
- f, file,
- flags,
- &buffer_len,
- &stream_start_offset);
- if (buffer_len == 0)
- goto end;
-
- det_ctx->buffer_offset = 0;
- det_ctx->discontinue_matching = 0;
- det_ctx->inspection_recursion_counter = 0;
- match = DetectEngineContentInspection(de_ctx, det_ctx, s, s->sm_lists[DETECT_SM_LIST_FILEDATA],
- f,
- buffer,
- buffer_len,
- stream_start_offset,
- DETECT_ENGINE_CONTENT_INSPECTION_MODE_FD_SMTP, NULL);
- if (match == 1)
- r = 1;
- }
- }
-
-end:
- if (r == 1)
- return DETECT_ENGINE_INSPECT_SIG_MATCH;
- else
- return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
-}
-
-void DetectEngineCleanSMTPBuffers(DetectEngineThreadCtx *det_ctx)
-{
- if (det_ctx->smtp_buffers_list_len > 0) {
- for (int i = 0; i < det_ctx->smtp_buffers_list_len; i++) {
- det_ctx->smtp[i].buffer_len = 0;
- det_ctx->smtp[i].offset = 0;
- }
- }
- det_ctx->smtp_buffers_list_len = 0;
- det_ctx->smtp_start_tx_id = 0;
-
- return;
-}
-
-int DetectEngineRunSMTPMpm(DetectEngineCtx *de_ctx,
- DetectEngineThreadCtx *det_ctx, Flow *f,
- SMTPState *smtp_state, uint8_t flags,
- void *tx, uint64_t idx)
-{
- FileContainer *ffc = smtp_state->files_ts;
- uint32_t cnt = 0;
- uint32_t buffer_len = 0;
- uint32_t stream_start_offset = 0;
- uint8_t *buffer = NULL;
-
- if (ffc != NULL) {
- File *file = ffc->head;
- for (; file != NULL; file = file->next) {
- buffer = DetectEngineSMTPGetBufferForTX(idx,
- de_ctx, det_ctx,
- f, file,
- flags,
- &buffer_len,
- &stream_start_offset);
- if (buffer_len == 0)
- goto end;
-
- cnt += SMTPFiledataPatternSearch(det_ctx, buffer, buffer_len, flags);
- }
- }
-end:
- return cnt;
-}
-
-#ifdef UNITTESTS
-
-static int DetectEngineSMTPFiledataTest01(void)
-{
- uint8_t mimemsg[] = {0x4D, 0x49, 0x4D, 0x45, 0x2D, 0x56, 0x65, 0x72,
- 0x73, 0x69, 0x6F, 0x6E, 0x3A, 0x20, 0x31, 0x2E,
- 0x30, 0x0D, 0x0A, 0x43, 0x6F, 0x6E, 0x74, 0x65,
- 0x6E, 0x74, 0x2D, 0x54, 0x79, 0x70, 0x65, 0x3A,
- 0x20, 0x74, 0x65, 0x78, 0x74, 0x2F, 0x70, 0x6C,
- 0x61, 0x69, 0x6E, 0x3B, 0x20, 0x63, 0x68, 0x61,
- 0x72, 0x73, 0x65, 0x74, 0x3D, 0x55, 0x54, 0x46,
- 0x2D, 0x38, 0x3B, 0x0D, 0x0A, 0x43, 0x6F, 0x6E,
- 0x74, 0x65, 0x6E, 0x74, 0x2D, 0x54, 0x72, 0x61,
- 0x6E, 0x73, 0x66, 0x65, 0x72, 0x2D, 0x45, 0x6E,
- 0x63, 0x6F, 0x64, 0x69, 0x6E, 0x67, 0x3A, 0x20,
- 0x37, 0x62, 0x69, 0x74, 0x0D, 0x0A, 0x43, 0x6F,
- 0x6E, 0x74, 0x65, 0x6E, 0x74, 0x2D, 0x44, 0x69,
- 0x73, 0x70, 0x6F, 0x73, 0x69, 0x74, 0x69, 0x6F,
- 0x6E, 0x3A, 0x20, 0x61, 0x74, 0x74, 0x61, 0x63,
- 0x68, 0x6D, 0x65, 0x6E, 0x74, 0x3B, 0x20, 0x66,
- 0x69, 0x6C, 0x65, 0x6E, 0x61, 0x6D, 0x65, 0x3D,
- 0x22, 0x74, 0x65, 0x73, 0x74, 0x2E, 0x74, 0x78,
- 0x74, 0x22, 0x0D, 0x0A, 0x0D, 0x0A, 0x6d, 0x65,
- 0x73, 0x73, 0x61, 0x67, 0x65,};
- uint32_t mimemsg_len = sizeof(mimemsg) - 1;
- TcpSession ssn;
- Packet *p;
- ThreadVars th_v;
- DetectEngineCtx *de_ctx = NULL;
- DetectEngineThreadCtx *det_ctx = NULL;
- SMTPState *smtp_state = NULL;
- Flow f;
- int result = 0;
-
- AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
-
- memset(&th_v, 0, sizeof(th_v));
- memset(&f, 0, sizeof(f));
- memset(&ssn, 0, sizeof(ssn));
-
- p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
-
- FLOW_INITIALIZE(&f);
- f.protoctx = (void *)&ssn;
- f.proto = IPPROTO_TCP;
- f.flags |= FLOW_IPV4;
- f.alstate = SMTPStateAlloc();
-
- MimeDecParseState *state = MimeDecInitParser(&f, NULL);
- ((MimeDecEntity *)state->stack->top->data)->ctnt_flags = CTNT_IS_ATTACHMENT;
- state->body_begin = 1;
-
- if (SMTPProcessDataChunk((uint8_t *)mimemsg, sizeof(mimemsg), state) != 0)
- goto end;
-
- p->flow = &f;
- p->flowflags |= FLOW_PKT_TOSERVER;
- p->flowflags |= FLOW_PKT_ESTABLISHED;
- p->flags |= PKT_HAS_FLOW|PKT_STREAM_EST;
- f.alproto = ALPROTO_SMTP;
-
- StreamTcpInitConfig(TRUE);
-
- de_ctx = DetectEngineCtxInit();
- if (de_ctx == NULL)
- goto end;
-
- de_ctx->flags |= DE_QUIET;
-
- de_ctx->sig_list = SigInit(de_ctx, "alert smtp any any -> any any "
- "(msg:\"file_data smtp test\"; "
- "file_data; content:\"message\"; sid:1;)");
- if (de_ctx->sig_list == NULL) {
- goto end;
- }
-
- SigGroupBuild(de_ctx);
- DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
-
- SCMutexLock(&f.m);
- int r = AppLayerParserParse(alp_tctx, &f, ALPROTO_SMTP, STREAM_TOSERVER, mimemsg, mimemsg_len);
- if (r != 0) {
- printf("AppLayerParse for smtp failed. Returned %d", r);
- SCMutexUnlock(&f.m);
- goto end;
- }
- SCMutexUnlock(&f.m);
-
- smtp_state = f.alstate;
- if (smtp_state == NULL) {
- printf("no smtp state: ");
- goto end;
- }
-
- /* do detect */
- SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
-
- if (!(PacketAlertCheck(p, 1))) {
- printf("sid 1 didn't match but should have\n");
- goto end;
- }
-
- result = 1;
-
-end:
- if (alp_tctx != NULL)
- AppLayerParserThreadCtxFree(alp_tctx);
- if (de_ctx != NULL)
- SigGroupCleanup(de_ctx);
- if (de_ctx != NULL)
- SigCleanSignatures(de_ctx);
-
- StreamTcpFreeConfig(TRUE);
- FLOW_DESTROY(&f);
- UTHFreePackets(&p, 1);
- return result;
-}
-
-static int DetectEngineSMTPFiledataTest02(void)
-{
- Signature *s = NULL;
- DetectEngineCtx *de_ctx = NULL;
- int result = 0;
-
- de_ctx = DetectEngineCtxInit();
- if (de_ctx == NULL)
- goto end;
-
- de_ctx->flags |= DE_QUIET;
-
- s = DetectEngineAppendSig(de_ctx, "alert smtp any any -> any any "
- "(msg:\"file_data smtp test\"; "
- "file_data; content:\"message\"; sid:1;)");
- if (s == NULL)
- goto end;
-
- if (s->flags & SIG_FLAG_TOSERVER)
- result = 1;
- else if (s->flags & SIG_FLAG_TOCLIENT)
- printf("s->flags & SIG_FLAG_TOCLIENT");
-
-end:
- SigCleanSignatures(de_ctx);
- DetectEngineCtxFree(de_ctx);
- return result;
-
-}
-
-static int DetectEngineSMTPFiledataTest03(void)
-{
- uint8_t mimemsg1[] = {0x65, 0x76,};
- uint8_t mimemsg2[] = {0x69, 0x6C,};
- uint32_t mimemsg1_len = sizeof(mimemsg1) - 1;
- uint32_t mimemsg2_len = sizeof(mimemsg2) - 1;
- TcpSession ssn;
- Packet *p;
- ThreadVars th_v;
- DetectEngineCtx *de_ctx = NULL;
- DetectEngineThreadCtx *det_ctx = NULL;
- SMTPState *smtp_state = NULL;
- Flow f;
- int result = 1;
-
- AppLayerParserThreadCtx *alp_tctx = AppLayerParserThreadCtxAlloc();
-
- memset(&th_v, 0, sizeof(th_v));
- memset(&f, 0, sizeof(f));
- memset(&ssn, 0, sizeof(ssn));
-
- p = UTHBuildPacket(NULL, 0, IPPROTO_TCP);
-
- FLOW_INITIALIZE(&f);
- f.protoctx = (void *)&ssn;
- f.proto = IPPROTO_TCP;
- f.flags |= FLOW_IPV4;
- f.alstate = SMTPStateAlloc();
-
- MimeDecParseState *state = MimeDecInitParser(&f, NULL);
- ((MimeDecEntity *)state->stack->top->data)->ctnt_flags = CTNT_IS_ATTACHMENT;
- state->body_begin = 1;
-
- if (SMTPProcessDataChunk((uint8_t *)mimemsg1, sizeof(mimemsg1), state) != 0)
- goto end;
-
- if (SMTPProcessDataChunk((uint8_t *)mimemsg2, sizeof(mimemsg2), state) != 0)
- goto end;
-
- p->flow = &f;
- p->flowflags |= FLOW_PKT_TOSERVER;
- p->flowflags |= FLOW_PKT_ESTABLISHED;
- p->flags |= PKT_HAS_FLOW|PKT_STREAM_EST;
- f.alproto = ALPROTO_SMTP;
-
- StreamTcpInitConfig(TRUE);
-
- de_ctx = DetectEngineCtxInit();
- if (de_ctx == NULL)
- goto end;
-
- de_ctx->flags |= DE_QUIET;
-
- de_ctx->sig_list = SigInit(de_ctx, "alert smtp any any -> any any "
- "(msg:\"file_data smtp test\"; "
- "file_data; content:\"evil\"; sid:1;)");
- if (de_ctx->sig_list == NULL) {
- goto end;
- }
-
- SigGroupBuild(de_ctx);
- DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
-
- SCMutexLock(&f.m);
- int r = 0;
- r = AppLayerParserParse(alp_tctx, &f, ALPROTO_SMTP, STREAM_TOSERVER, mimemsg1, mimemsg1_len);
- if (r != 0) {
- printf("AppLayerParse for smtp failed. Returned %d", r);
- SCMutexUnlock(&f.m);
- goto end;
- }
- r = AppLayerParserParse(alp_tctx, &f, ALPROTO_SMTP, STREAM_TOSERVER, mimemsg2, mimemsg2_len);
- if (r != 0) {
- printf("AppLayerParse for smtp failed. Returned %d", r);
- SCMutexUnlock(&f.m);
- goto end;
- }
- SCMutexUnlock(&f.m);
-
- smtp_state = f.alstate;
- if (smtp_state == NULL) {
- printf("no smtp state: ");
- goto end;
- }
-
- /* do detect */
- SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
-
- if (PacketAlertCheck(p, 1)) {
- printf("sid 1 matched but shouldn't have\n");
- goto end;
- }
-
- result = 0;
-
-end:
- if (alp_tctx != NULL)
- AppLayerParserThreadCtxFree(alp_tctx);
- if (de_ctx != NULL)
- SigGroupCleanup(de_ctx);
- if (de_ctx != NULL)
- SigCleanSignatures(de_ctx);
-
- StreamTcpFreeConfig(TRUE);
- FLOW_DESTROY(&f);
- UTHFreePackets(&p, 1);
- return result;
-}
-
-#endif /* UNITTESTS */
-
-void DetectEngineSMTPFiledataRegisterTests(void)
-{
- #ifdef UNITTESTS
- UtRegisterTest("DetectEngineSMTPFiledataTest01",
- DetectEngineSMTPFiledataTest01, 1);
- UtRegisterTest("DetectEngineSMTPFiledataTest02",
- DetectEngineSMTPFiledataTest02, 1);
- UtRegisterTest("DetectEngineSMTPFiledataTest03",
- DetectEngineSMTPFiledataTest03, 0);
- #endif /* UNITTESTS */
-
- return;
-}