file-hashing: added support for SHA-256 file hashing

src/Makefile.am

@@ -139,6 +139,7 @@ detect-fileext.c detect-fileext.h \
 detect-filemagic.c detect-filemagic.h \
 detect-filemd5.c detect-filemd5.h \
 detect-filesha1.c detect-filesha1.h \
+detect-filesha256.c detect-filesha256.h \
 detect-filename.c detect-filename.h \
 detect-filesize.c detect-filesize.h \
 detect-filestore.c detect-filestore.h \

src/app-layer-htp-file.c

@@ -123,6 +123,11 @@ int HTPFileOpen(HtpState *s, const uint8_t *filename, uint16_t filename_len,
             flags |= FILE_NOSHA1;
         }
 
+        if (s->f->flags & FLOW_FILE_NO_SHA256_TC) {
+            SCLogDebug("no sha256 for this flow in toclient direction, so none for this file");
+            flags |= FILE_NOSHA256;
+        }
+
         if (!(flags & FILE_STORE) && (s->f->flags & FLOW_FILE_NO_STORE_TC)) {
             flags |= FILE_NOSTORE;
         }
@@ -160,6 +165,11 @@ int HTPFileOpen(HtpState *s, const uint8_t *filename, uint16_t filename_len,
             flags |= FILE_NOSHA1;
         }
 
+        if (s->f->flags & FLOW_FILE_NO_SHA256_TS) {
+            SCLogDebug("no sha256 for this flow in toserver direction, so none for this file");
+            flags |= FILE_NOSHA256;
+        }
+
         if (!(flags & FILE_STORE) && (s->f->flags & FLOW_FILE_NO_STORE_TS)) {
             flags |= FILE_NOSTORE;
         }

src/app-layer-smtp.c

@@ -427,6 +427,10 @@ int SMTPProcessDataChunk(const uint8_t *chunk, uint32_t len,
         flags |= FILE_NOSHA1;
     }
 
+    if (flow->flags & FLOW_FILE_NO_SHA256_TS) {
+        flags |= FILE_NOSHA256;
+    }
+
     /* Find file */
     if (entity->ctnt_flags & CTNT_IS_ATTACHMENT) {
 

src/detect-engine-file.c

@@ -135,6 +135,12 @@ static int DetectFileInspect(ThreadVars *tv, DetectEngineThreadCtx *det_ctx,
                 break;
             }
 
+            if ((s->file_flags & FILE_SIG_NEED_SHA256) && (!(file->flags & FILE_SHA256))) {
+                SCLogDebug("sig needs file sha256, but we don't have any");
+                r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
+                break;
+            }
+
             if ((s->file_flags & FILE_SIG_NEED_SIZE) && file->state < FILE_STATE_CLOSED) {
                 SCLogDebug("sig needs filesize, but state < FILE_STATE_CLOSED");
                 r = DETECT_ENGINE_INSPECT_SIG_NO_MATCH;

src/detect-engine-siggroup.c

@@ -637,6 +637,12 @@ void SigGroupHeadSetFileHashFlag(DetectEngineCtx *de_ctx, SigGroupHead *sgh)
             SCLogDebug("sgh %p has filesha1", sgh);
             break;
         }
+
+        if (SignatureIsFileSha256Inspecting(s)) {
+            sgh->flags |= SIG_GROUP_HEAD_HAVEFILESHA256;
+            SCLogDebug("sgh %p has filesha256", sgh);
+            break;
+        }
     }
 
     return;

src/detect-filemd5.c

@@ -25,7 +25,6 @@
 #include "suricata-common.h"
 
 #include "util-detect-file-hash.h"
-
 #include "util-unittest.h"
 #include "util-unittest-helper.h"
 

src/detect-filesha1.c

@@ -26,7 +26,6 @@
 #include "suricata-common.h"
 
 #include "util-detect-file-hash.h"
-
 #include "util-unittest.h"
 #include "util-unittest-helper.h"
 

src/detect-filesha256.c

@@ -0,0 +1,161 @@
+/* Copyright (C) 2007-2016 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 Duarte Silva <duarte.silva@serializing.me>
+ *
+ */
+
+#include "suricata-common.h"
+
+#include "util-detect-file-hash.h"
+#include "util-unittest.h"
+#include "util-unittest-helper.h"
+
+#include "detect-filesha256.h"
+
+#ifndef HAVE_NSS
+
+static int DetectFileSha256SetupNoSupport (DetectEngineCtx *a, Signature *b, char *c)
+{
+    SCLogError(SC_ERR_NO_SHA256_SUPPORT, "no SHA-256 calculation support built in, needed for filesha256 keyword");
+    return -1;
+}
+
+/**
+ * \brief Registration function for keyword: filesha256
+ */
+void DetectFileSha256Register(void)
+{
+    sigmatch_table[DETECT_FILESHA256].name = "filesha256";
+    sigmatch_table[DETECT_FILESHA256].FileMatch = NULL;
+    sigmatch_table[DETECT_FILESHA256].Setup = DetectFileSha256SetupNoSupport;
+    sigmatch_table[DETECT_FILESHA256].Free  = NULL;
+    sigmatch_table[DETECT_FILESHA256].RegisterTests = NULL;
+    sigmatch_table[DETECT_FILESHA256].flags = SIGMATCH_NOT_BUILT;
+
+    SCLogDebug("registering filesha256 rule option");
+    return;
+}
+
+#else /* HAVE_NSS */
+
+static int DetectFileSha256Setup (DetectEngineCtx *, Signature *, char *);
+static void DetectFileSha256RegisterTests(void);
+
+/**
+ * \brief Registration function for keyword: filesha256
+ */
+void DetectFileSha256Register(void)
+{
+    sigmatch_table[DETECT_FILESHA256].name = "filesha256";
+    sigmatch_table[DETECT_FILESHA256].desc = "match file SHA-256 against list of SHA-256 checksums";
+    sigmatch_table[DETECT_FILESHA256].url = "https://redmine.openinfosecfoundation.org/projects/suricata/wiki/File-keywords#filesha256";
+    sigmatch_table[DETECT_FILESHA256].FileMatch = DetectFileHashMatch;
+    sigmatch_table[DETECT_FILESHA256].Setup = DetectFileSha256Setup;
+    sigmatch_table[DETECT_FILESHA256].Free  = DetectFileHashFree;
+    sigmatch_table[DETECT_FILESHA256].RegisterTests = DetectFileSha256RegisterTests;
+
+    SCLogDebug("registering filesha256 rule option");
+    return;
+}
+
+/**
+ * \brief this function is used to parse filesha256 options
+ * \brief into the current signature
+ *
+ * \param de_ctx pointer to the Detection Engine Context
+ * \param s pointer to the Current Signature
+ * \param str pointer to the user provided "filesha256" option
+ *
+ * \retval 0 on Success
+ * \retval -1 on Failure
+ */
+static int DetectFileSha256Setup (DetectEngineCtx *de_ctx, Signature *s, char *str)
+{
+    return DetectFileHashSetup(de_ctx, s, str, DETECT_FILESHA256);
+}
+
+#ifdef UNITTESTS
+static int SHA256MatchLookupString(ROHashTable *hash, char *string)
+{
+    uint8_t sha256[32];
+    if (ReadHashString(sha256, string, "file", 88, 64) == 1) {
+        void *ptr = ROHashLookup(hash, &sha256, (uint16_t)sizeof(sha256));
+        if (ptr == NULL)
+            return 0;
+        else
+            return 1;
+    }
+    return 0;
+}
+
+static int SHA256MatchTest01(void)
+{
+    ROHashTable *hash = ROHashInit(4, 32);
+    if (hash == NULL) {
+        return 0;
+    }
+    if (LoadHashTable(hash, "9c891edb5da763398969b6aaa86a5d46971bd28a455b20c2067cb512c9f9a0f8", "file", 1, DETECT_FILESHA256) != 1)
+        return 0;
+    if (LoadHashTable(hash, "6eee51705f34b6cfc7f0c872a7949ec3e3172a908303baf5d67d03b98f70e7e3", "file", 2, DETECT_FILESHA256) != 1)
+        return 0;
+    if (LoadHashTable(hash, "b12c7d57507286bbbe36d7acf9b34c22c96606ffd904e3c23008399a4a50c047", "file", 3, DETECT_FILESHA256) != 1)
+        return 0;
+    if (LoadHashTable(hash, "ca496e1ddadc290050339dd75ce8830ad3028ce1556a5368874a4aec3aee114b", "file", 4, DETECT_FILESHA256) != 1)
+        return 0;
+    if (LoadHashTable(hash, "275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f", "file", 5, DETECT_FILESHA256) != 1)
+        return 0;
+    if (LoadHashTable(hash, "d765e722e295969c0a5c2d90f549db8b89ab617900bf4698db41c7cdad993bb9", "file", 6, DETECT_FILESHA256) != 1)
+        return 0;
+
+    if (ROHashInitFinalize(hash) != 1) {
+        return 0;
+    }
+
+    if (SHA256MatchLookupString(hash, "9c891edb5da763398969b6aaa86a5d46971bd28a455b20c2067cb512c9f9a0f8") != 1)
+        return 0;
+    if (SHA256MatchLookupString(hash, "6eee51705f34b6cfc7f0c872a7949ec3e3172a908303baf5d67d03b98f70e7e3") != 1)
+        return 0;
+    if (SHA256MatchLookupString(hash, "b12c7d57507286bbbe36d7acf9b34c22c96606ffd904e3c23008399a4a50c047") != 1)
+        return 0;
+    if (SHA256MatchLookupString(hash, "ca496e1ddadc290050339dd75ce8830ad3028ce1556a5368874a4aec3aee114b") != 1)
+        return 0;
+    if (SHA256MatchLookupString(hash, "275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f") != 1)
+        return 0;
+    if (SHA256MatchLookupString(hash, "d765e722e295969c0a5c2d90f549db8b89ab617900bf4698db41c7cdad993bb9") != 1)
+        return 0;
+    /* Shouldn't match */
+    if (SHA256MatchLookupString(hash, "3333333333333333333333333333333333333333333333333333333333333333") == 1)
+        return 0;
+
+    ROHashFree(hash);
+    return 1;
+}
+#endif
+
+void DetectFileSha256RegisterTests(void)
+{
+#ifdef UNITTESTS
+    UtRegisterTest("SHA256MatchTest01", SHA256MatchTest01);
+#endif
+}
+
+#endif /* HAVE_NSS */

src/detect-filesha256.h

@@ -0,0 +1,31 @@
+/* Copyright (C) 2007-2016 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 Duarte Silva <duarte.silva@serializing.me>
+ */
+
+#ifndef __DETECT_FILESHA256_H__
+#define __DETECT_FILESHA256_H__
+
+/* prototypes */
+void DetectFileSha256Register (void);
+
+#endif /* __DETECT_FILESHA256_H__ */

src/detect.c

@@ -109,6 +109,7 @@
 #include "detect-filemagic.h"
 #include "detect-filemd5.h"
 #include "detect-filesha1.h"
+#include "detect-filesha256.h"
 #include "detect-filesize.h"
 #include "detect-dsize.h"
 #include "detect-flowvar.h"
@@ -1870,6 +1871,14 @@ end:
                     FileDisableSha1(pflow, STREAM_TOSERVER);
                 }
 
+                /* see if this sgh requires us to consider file sha256 */
+                if (!FileForceSha256() && (pflow->sgh_toserver == NULL ||
+                            !(pflow->sgh_toserver->flags & SIG_GROUP_HEAD_HAVEFILESHA256)))
+                {
+                    SCLogDebug("disabling sha256 for flow");
+                    FileDisableSha256(pflow, STREAM_TOSERVER);
+                }
+
                 /* see if this sgh requires us to consider filesize */
                 if (pflow->sgh_toserver == NULL ||
                             !(pflow->sgh_toserver->flags & SIG_GROUP_HEAD_HAVEFILESIZE))
@@ -1909,6 +1918,14 @@ end:
                     FileDisableSha1(pflow, STREAM_TOCLIENT);
                 }
 
+                /* check if this flow needs sha256, if not disable it */
+                if (!FileForceSha256() && (pflow->sgh_toclient == NULL ||
+                            !(pflow->sgh_toclient->flags & SIG_GROUP_HEAD_HAVEFILESHA256)))
+                {
+                    SCLogDebug("disabling sha256 for flow");
+                    FileDisableSha256(pflow, STREAM_TOCLIENT);
+                }
+
                 /* see if this sgh requires us to consider filesize */
                 if (pflow->sgh_toclient == NULL ||
                             !(pflow->sgh_toclient->flags & SIG_GROUP_HEAD_HAVEFILESIZE))
@@ -2185,6 +2202,22 @@ int SignatureIsFileSha1Inspecting(Signature *s)
     return 0;
 }
 
+/**
+ *  \brief Check if a signature contains the filesha256 keyword.
+ *
+ *  \param s signature
+ *
+ *  \retval 0 no
+ *  \retval 1 yes
+ */
+int SignatureIsFileSha256Inspecting(Signature *s)
+{
+    if ((s != NULL) && (s->file_flags & FILE_SIG_NEED_SHA256))
+        return 1;
+
+    return 0;
+}
+
 /**
  *  \brief Check if a signature contains the filesize keyword.
  *
@@ -4409,6 +4442,7 @@ void SigTableSetup(void)
     DetectFilemagicRegister();
     DetectFileMd5Register();
     DetectFileSha1Register();
+    DetectFileSha256Register();
     DetectFilesizeRegister();
     DetectAppLayerEventRegister();
     DetectHttpUARegister();

src/detect.h

@@ -938,12 +938,13 @@ typedef struct SigTableElmt_ {
 #define SIG_GROUP_HEAD_HAVEFILEMD5      (1 << 21)
 #define SIG_GROUP_HEAD_HAVEFILESIZE     (1 << 22)
 #define SIG_GROUP_HEAD_HAVEFILESHA1     (1 << 23)
+#define SIG_GROUP_HEAD_HAVEFILESHA256   (1 << 24)
 
-#define SIG_GROUP_HEAD_MPM_DNSQUERY     (1 << 24)
-#define SIG_GROUP_HEAD_MPM_TLSSNI       (1 << 25)
-#define SIG_GROUP_HEAD_MPM_TLSISSUER    (1 << 26)
-#define SIG_GROUP_HEAD_MPM_TLSSUBJECT   (1 << 27)
-#define SIG_GROUP_HEAD_MPM_FD_SMTP      (1 << 28)
+#define SIG_GROUP_HEAD_MPM_DNSQUERY     (1 << 25)
+#define SIG_GROUP_HEAD_MPM_TLSSNI       (1 << 26)
+#define SIG_GROUP_HEAD_MPM_TLSISSUER    (1 << 27)
+#define SIG_GROUP_HEAD_MPM_TLSSUBJECT   (1 << 28)
+#define SIG_GROUP_HEAD_MPM_FD_SMTP      (1 << 29)
 
 #define APP_MPMS_MAX 21
 
@@ -1281,6 +1282,7 @@ int SignatureIsFilestoring(Signature *);
 int SignatureIsFilemagicInspecting(Signature *);
 int SignatureIsFileMd5Inspecting(Signature *);
 int SignatureIsFileSha1Inspecting(Signature *s);
+int SignatureIsFileSha256Inspecting(Signature *s);
 int SignatureIsFilesizeInspecting(Signature *);
 
 int DetectRegisterThreadCtxFuncs(DetectEngineCtx *, const char *name, void *(*InitFunc)(void *), void *data, void (*FreeFunc)(void *), int);

src/flow.h

@@ -105,6 +105,10 @@ typedef struct AppLayerParserState_ AppLayerParserState;
 #define FLOW_FILE_NO_SHA1_TS              0x04000000
 #define FLOW_FILE_NO_SHA1_TC              0x08000000
 
+/** no sha256 on files in this flow */
+#define FLOW_FILE_NO_SHA256_TS            0x10000000
+#define FLOW_FILE_NO_SHA256_TC            0x20000000
+
 /** no size tracking of files in this flow */
 #define FLOW_FILE_NO_SIZE_TS              0x40000000
 #define FLOW_FILE_NO_SIZE_TC              0x80000000

src/log-file.c

@@ -298,6 +298,14 @@ static void LogFileWriteJsonRecord(LogFileLogThread *aft, const Packet *p, const
                 }
                 fprintf(fp, "\", ");
             }
+            if (ff->flags & FILE_SHA256) {
+                fprintf(fp, "\"sha256\": \"");
+                size_t x;
+                for (x = 0; x < sizeof(ff->sha256); x++) {
+                    fprintf(fp, "%02x", ff->sha256[x]);
+                }
+                fprintf(fp, "\", ");
+            }
 #endif
             break;
         case FILE_STATE_TRUNCATED:

src/log-filestore.c

@@ -269,6 +269,14 @@ static void LogFilestoreLogCloseMetaFile(const File *ff)
                     }
                     fprintf(fp, "\n");
                 }
+                if (ff->flags & FILE_SHA256) {
+                    fprintf(fp, "SHA256:            ");
+                    size_t x;
+                    for (x = 0; x < sizeof(ff->sha256); x++) {
+                        fprintf(fp, "%02x", ff->sha256[x]);
+                    }
+                    fprintf(fp, "\n");
+                }
 #endif
                 break;
             case FILE_STATE_TRUNCATED:

src/output-json-file.c

@@ -143,6 +143,15 @@ static void FileWriteJsonRecord(JsonFileLogThread *aft, const Packet *p, const F
                 }
                 json_object_set_new(fjs, "sha1", json_string(s));
             }
+            if (ff->flags & FILE_SHA256) {
+                size_t x;
+                int i;
+                char s[256];
+                for (i = 0, x = 0; x < sizeof(ff->sha256); x++) {
+                    i += snprintf(&s[i], 255-i, "%02x", ff->sha256[x]);
+                }
+                json_object_set_new(fjs, "sha256", json_string(s));
+            }
 #endif
             break;
         case FILE_STATE_TRUNCATED:

src/util-error.c

@@ -328,6 +328,7 @@ const char * SCErrorToString(SCError err)
         CASE_CODE (SC_ERR_NO_FILES_FOR_PROTOCOL);
         CASE_CODE (SC_ERR_INVALID_HASH);
         CASE_CODE (SC_ERR_NO_SHA1_SUPPORT);
+        CASE_CODE (SC_ERR_NO_SHA256_SUPPORT);
     }
 
     return "UNKNOWN_ERROR";

src/util-error.h

@@ -318,6 +318,7 @@ typedef enum {
     SC_ERR_NO_FILES_FOR_PROTOCOL,
     SC_ERR_INVALID_HASH,
     SC_ERR_NO_SHA1_SUPPORT,
+    SC_ERR_NO_SHA256_SUPPORT,
 } SCError;
 
 const char *SCErrorToString(SCError);

src/util-file.c

@@ -56,6 +56,11 @@ static int g_file_force_md5 = 0;
  */
 static int g_file_force_sha1 = 0;
 
+/** \brief switch to force sha256 calculation on all files
+ *         regardless of the rules.
+ */
+static int g_file_force_sha256 = 0;
+
 /** \brief switch to force tracking off all files
  *         regardless of the rules.
  */
@@ -84,6 +89,11 @@ void FileForceSha1Enable(void)
     g_file_force_sha1 = 1;
 }
 
+void FileForceSha256Enable(void)
+{
+    g_file_force_sha256 = 1;
+}
+
 int FileForceFilestore(void)
 {
     return g_file_force_filestore;
@@ -104,6 +114,11 @@ int FileForceSha1(void)
     return g_file_force_sha1;
 }
 
+int FileForceSha256(void)
+{
+    return g_file_force_sha256;
+}
+
 void FileForceTrackingEnable(void)
 {
     g_file_force_tracking = 1;
@@ -306,6 +321,8 @@ static void FileFree(File *ff)
         HASH_Destroy(ff->md5_ctx);
     if (ff->sha1_ctx)
         HASH_Destroy(ff->sha1_ctx);
+    if (ff->sha256_ctx)
+        HASH_Destroy(ff->sha256_ctx);
 #endif
     SCFree(ff);
 }
@@ -383,6 +400,9 @@ static int AppendData(File *file, const uint8_t *data, uint32_t data_len)
     if (file->sha1_ctx) {
         HASH_Update(file->sha1_ctx, data, data_len);
     }
+    if (file->sha256_ctx) {
+        HASH_Update(file->sha256_ctx, data, data_len);
+    }
 #endif
     SCReturnInt(0);
 }
@@ -425,6 +445,10 @@ int FileAppendData(FileContainer *ffc, const uint8_t *data, uint32_t data_len)
             HASH_Update(ffc->tail->sha1_ctx, data, data_len);
             SCReturnInt(0);
         }
+        if (ffc->tail->sha256_ctx) {
+            HASH_Update(ffc->tail->sha256_ctx, data, data_len);
+            SCReturnInt(0);
+        }
 #endif
         if (g_file_force_tracking || (!(ffc->tail->flags & FILE_NOTRACK)))
             SCReturnInt(0);
@@ -497,6 +521,10 @@ File *FileOpenFile(FileContainer *ffc, const StreamingBufferConfig *sbcfg,
         SCLogDebug("not doing sha1 for this file");
         ff->flags |= FILE_NOSHA1;
     }
+    if (flags & FILE_NOSHA256) {
+        SCLogDebug("not doing sha256 for this file");
+        ff->flags |= FILE_NOSHA256;
+    }
     if (flags & FILE_USE_DETECT) {
         SCLogDebug("considering content_inspect tracker when pruning");
         ff->flags |= FILE_USE_DETECT;
@@ -515,6 +543,12 @@ File *FileOpenFile(FileContainer *ffc, const StreamingBufferConfig *sbcfg,
             HASH_Begin(ff->sha1_ctx);
         }
     }
+    if (!(ff->flags & FILE_NOSHA256) || g_file_force_sha256) {
+        ff->sha256_ctx = HASH_Create(HASH_AlgSHA256);
+        if (ff->sha256_ctx != NULL) {
+            HASH_Begin(ff->sha256_ctx);
+        }
+    }
 #endif
 
     ff->state = FILE_STATE_OPENED;
@@ -554,6 +588,8 @@ static int FileCloseFilePtr(File *ff, const uint8_t *data,
                 HASH_Update(ff->md5_ctx, data, data_len);
             if (ff->sha1_ctx)
                 HASH_Update(ff->sha1_ctx, data, data_len);
+            if (ff->sha256_ctx)
+                HASH_Update(ff->sha256_ctx, data, data_len);
 #endif
         } else {
             if (AppendData(ff, data, data_len) != 0) {
@@ -586,6 +622,11 @@ static int FileCloseFilePtr(File *ff, const uint8_t *data,
             HASH_End(ff->sha1_ctx, ff->sha1, &len, sizeof(ff->sha1));
             ff->flags |= FILE_SHA1;
         }
+        if (ff->sha256_ctx) {
+            unsigned int len = 0;
+            HASH_End(ff->sha256_ctx, ff->sha256, &len, sizeof(ff->sha256));
+            ff->flags |= FILE_SHA256;
+        }
 #endif
     }
 
@@ -760,6 +801,45 @@ void FileDisableSha1(Flow *f, uint8_t direction)
     SCReturn;
 }
 
+/**
+ *  \brief disable file sha256 calc for this flow
+ *
+ *  \param f *LOCKED* flow
+ *  \param direction flow direction
+ */
+void FileDisableSha256(Flow *f, uint8_t direction)
+{
+    File *ptr = NULL;
+
+    SCEnter();
+
+    DEBUG_ASSERT_FLOW_LOCKED(f);
+
+    if (direction == STREAM_TOSERVER)
+        f->flags |= FLOW_FILE_NO_SHA256_TS;
+    else
+        f->flags |= FLOW_FILE_NO_SHA256_TC;
+
+    FileContainer *ffc = AppLayerParserGetFiles(f->proto, f->alproto, f->alstate, direction);
+    if (ffc != NULL) {
+        for (ptr = ffc->head; ptr != NULL; ptr = ptr->next) {
+            SCLogDebug("disabling sha256 for file %p from direction %s",
+                    ptr, direction == STREAM_TOSERVER ? "toserver":"toclient");
+            ptr->flags |= FILE_NOSHA256;
+
+#ifdef HAVE_NSS
+            /* destroy any ctx we may have so far */
+            if (ptr->sha256_ctx != NULL) {
+                HASH_Destroy(ptr->sha256_ctx);
+                ptr->sha256_ctx = NULL;
+            }
+#endif
+        }
+    }
+
+    SCReturn;
+}
+
 /**
  *  \brief disable file size tracking for this flow
  *
@@ -809,7 +889,8 @@ void FileDisableStoringForFile(File *ff)
     ff->flags |= FILE_NOSTORE;
 
     if (ff->state == FILE_STATE_OPENED && FileSize(ff) >= (uint64_t)FileMagicSize()) {
-        if (g_file_force_md5 == 0 && g_file_force_sha1 == 0 && g_file_force_tracking == 0) {
+        if (g_file_force_md5 == 0 && g_file_force_sha1 == 0 && g_file_force_sha256 == 0
+                && g_file_force_tracking == 0) {
             (void)FileCloseFilePtr(ff, NULL, 0,
                     (FILE_TRUNCATED|FILE_NOSTORE));
         }

src/util-file.h

@@ -193,6 +193,10 @@ void FileDisableSha1(Flow *f, uint8_t);
 void FileForceSha1Enable(void);
 int FileForceSha1(void);
 
+void FileDisableSha256(Flow *f, uint8_t);
+void FileForceSha256Enable(void);
+int FileForceSha256(void);
+
 void FileForceTrackingEnable(void);
 
 void FileStoreAllFiles(FileContainer *);

src/util-lua-common.c

@@ -603,9 +603,20 @@ static int LuaCallbackFileInfoPushToStackFromFile(lua_State *luastate, const Fil
             strlcat(sha1, one, sizeof(sha1));
         }
     }
+    char sha256[65] = "";
+    char *sha256ptr = sha256;
+    if (file->flags & FILE_SHA256) {
+        size_t x;
+        for (x = 0; x < sizeof(file->sha256); x++) {
+            char one[3] = "";
+            snprintf(one, sizeof(one), "%02x", file->sha256[x]);
+            strlcat(sha256, one, sizeof(sha256));
+        }
+    }
 #else
     char *md5ptr = NULL;
     char *sha1ptr = NULL;
+    char *sha256ptr = NULL;
 #endif
 
     lua_pushnumber(luastate, file->file_id);
@@ -615,6 +626,7 @@ static int LuaCallbackFileInfoPushToStackFromFile(lua_State *luastate, const Fil
     lua_pushstring (luastate, file->magic);
     lua_pushstring(luastate, md5ptr);
     lua_pushstring(luastate, sha1ptr);
+    lua_pushstring(luastate, sha256ptr);
     return 6;
 }