smtp: add 'body-md5' mime option

This option will allow the user to select weither or not he wants
to journalize the md5 of the mail body.

src/app-layer-smtp.c

@@ -220,7 +220,7 @@ SCEnumCharMap smtp_reply_map[ ] = {
 };
 
 /* Create SMTP config structure */
-SMTPConfig smtp_config = { 0, { 0, 0, 0, 0 }, 0, 0, 0};
+SMTPConfig smtp_config = { 0, { 0, 0, 0, 0, 0 }, 0, 0, 0};
 
 static SMTPString *SMTPStringAlloc(void);
 
@@ -266,6 +266,11 @@ static void SMTPConfigure(void) {
         if (ret) {
             smtp_config.mime_config.extract_urls = val;
         }
+
+        ret = ConfGetChildValueBool(config, "body-md5", &val);
+        if (ret) {
+            smtp_config.mime_config.body_md5 = val;
+        }
     }
 
     /* Pass mime config data to MimeDec API */

src/util-decode-mime.c

@@ -79,7 +79,7 @@
 #define MAX_IP6_CHARS  39
 
 /* Globally hold configuration data */
-static MimeDecConfig mime_dec_config = { 1, 1, 1, MAX_HEADER_VALUE };
+static MimeDecConfig mime_dec_config = { 1, 1, 1, 0, MAX_HEADER_VALUE };
 
 #ifdef DEBUG
 /* Mime Parser String translation */
@@ -2182,7 +2182,7 @@ static int ProcessMimeBody(const uint8_t *buf, uint32_t len,
     uint32_t tlen;
 
 #ifdef HAVE_NSS
-    if (state->body_begin == 1 && (state->md5_ctx == NULL)) {
+    if (MimeDecGetConfig()->body_md5 && state->body_begin == 1 && (state->md5_ctx == NULL)) {
         state->md5_ctx = HASH_Create(HASH_AlgMD5);
         if (state->md5_ctx != NULL) {
             HASH_Begin(state->md5_ctx);

src/util-decode-mime.h

@@ -97,6 +97,7 @@ typedef struct MimeDecConfig {
     int decode_base64;  /**< Decode base64 bodies */
     int decode_quoted_printable;  /**< Decode quoted-printable bodies */
     int extract_urls;  /**< Extract and store URLs in data structure */
+    int body_md5;  /**< Compute md5 sum of body */
     uint32_t header_value_depth;  /**< Depth of which to store header values
                                        (Default is 2000) */
 } MimeDecConfig;