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+                    GNU GENERAL PUBLIC LICENSE
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+                       Version 3, 29 June 2007
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+
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+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+receiving the covered work authorizing them to use, propagate, modify
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+or convey a specific copy of the covered work, then the patent license
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+you grant is automatically extended to all recipients of the covered
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+work and works based on it.
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+
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+  A patent license is "discriminatory" if it does not include within
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+the scope of its coverage, prohibits the exercise of, or is
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+conditioned on the non-exercise of one or more of the rights that are
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+specifically granted under this License.  You may not convey a covered
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+work if you are a party to an arrangement with a third party that is
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+in the business of distributing software, under which you make payment
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+to the third party based on the extent of your activity of conveying
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+the work, and under which the third party grants, to any of the
504
+parties who would receive the covered work from you, a discriminatory
505
+patent license (a) in connection with copies of the covered work
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+conveyed by you (or copies made from those copies), or (b) primarily
507
+for and in connection with specific products or compilations that
508
+contain the covered work, unless you entered into that arrangement,
509
+or that patent license was granted, prior to 28 March 2007.
510
+
511
+  Nothing in this License shall be construed as excluding or limiting
512
+any implied license or other defenses to infringement that may
513
+otherwise be available to you under applicable patent law.
514
+
515
+  12. No Surrender of Others' Freedom.
516
+
517
+  If conditions are imposed on you (whether by court order, agreement or
518
+otherwise) that contradict the conditions of this License, they do not
519
+excuse you from the conditions of this License.  If you cannot convey a
520
+covered work so as to satisfy simultaneously your obligations under this
521
+License and any other pertinent obligations, then as a consequence you may
522
+not convey it at all.  For example, if you agree to terms that obligate you
523
+to collect a royalty for further conveying from those to whom you convey
524
+the Program, the only way you could satisfy both those terms and this
525
+License would be to refrain entirely from conveying the Program.
526
+
527
+  13. Use with the GNU Affero General Public License.
528
+
529
+  Notwithstanding any other provision of this License, you have
530
+permission to link or combine any covered work with a work licensed
531
+under version 3 of the GNU Affero General Public License into a single
532
+combined work, and to convey the resulting work.  The terms of this
533
+License will continue to apply to the part which is the covered work,
534
+but the special requirements of the GNU Affero General Public License,
535
+section 13, concerning interaction through a network will apply to the
536
+combination as such.
537
+
538
+  14. Revised Versions of this License.
539
+
540
+  The Free Software Foundation may publish revised and/or new versions of
541
+the GNU General Public License from time to time.  Such new versions will
542
+be similar in spirit to the present version, but may differ in detail to
543
+address new problems or concerns.
544
+
545
+  Each version is given a distinguishing version number.  If the
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+Program specifies that a certain numbered version of the GNU General
547
+Public License "or any later version" applies to it, you have the
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+option of following the terms and conditions either of that numbered
549
+version or of any later version published by the Free Software
550
+Foundation.  If the Program does not specify a version number of the
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+GNU Genexy's
552
+public statement of acceptance of a version permanently authorizes you
553
+to choose that version for the Program.
554
+
555
+  Later license versions may give you additional or different
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+permissions.  However, no additional obligations are imposed on any
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+author or copyright holder as a result of your choosing to follow a
558
+later version.
559
+
560
+  15. Disclaimer of Warranty.
561
+
562
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
563
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
564
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
565
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
566
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
567
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
568
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
569
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
570
+
571
+  16. Limitation of Liability.
572
+
573
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
574
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
575
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
576
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
577
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
578
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
579
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
580
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
581
+SUCH DAMAGES.
582
+
583
+  17. Interpretation of Sections 15 and 16.
584
+
585
+  If the disclaimer of warranty and limitation of liability provided
586
+above cannot be given local legal effect according to their terms,
587
+reviewing courts shall apply local law that most closely approximates
588
+an absolute waiver of all civil liability in connection with the
589
+Program, unless a warranty or assumption of liability accompanies a
590
+copy of the Program in return for a fee.
591
+
592
+                     END OF TERMS AND CONDITIONS
593
+
594
+            How to Apply These Terms to Your New Programs
595
+
596
+  If you develop a new program, and you want it to be of the greatest
597
+possible use to the public, the best way to achieve this is to make it
598
+free software which everyone can redistribute and change under these terms.
599
+
600
+  To do so, attach the following notices to the program.  It is safest
601
+to attach them to the start of each source file to most effectively
602
+state the exclusion of warranty; and each file should have at least
603
+the "copyright" line and a pointer to where the full notice is found.
604
+
605
+    <one line to give the program's name and a brief idea of what it does.>
606
+    Copyright (C) <year>  <name of author>
607
+
608
+    This program is free software: you can redistribute it and/or modify
609
+    it under the terms of the GNU General Public License as published by
610
+    the Free Software Foundation, either version 3 of the License, or
611
+    (at your option) any later version.
612
+
613
+    This program is distributed in the hope that it will be useful,
614
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
615
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
616
+    GNU General Public License for more details.
617
+
618
+    You should have received a copy of the GNU General Public License
619
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
620
+
621
+Also add information on how to contact you by electronic and paper mail.
622
+
623
+  If the program does terminal interaction, make it output a short
624
+notice like this when it starts in an interactive mode:
625
+
626
+    <program>  Copyright (C) <year>  <name of author>
627
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
628
+    This is free software, and you are welcome to redistribute it
629
+    under certain conditions; type `show c' for details.
630
+
631
+The hypothetical commands `show w' and `show c' should show the appropriate
632
+parts of the General Public License.  Of course, your program's commands
633
+might be different; for a GUI interface, you would use an "about box".
634
+
635
+  You should also get your employer (if you work as a programmerrams.  If your program is a subroutine library, you
636
+may consider it more useful to permit linking proprietary applications with
637
+the library.  If this is what you want to do, use the GNU Lesser General
638
+Public License instead of this License.  But first, please read
639
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
640
+

+ 10
- 0
README View File

@@ -0,0 +1,10 @@
1
+HtmlSteg :
2
+----------
3
+
4
+Is able to hide raw datas in "invisible" HTML characters (repeating whitespaces).
5
+
6
+Examples :
7
+----------
8
+
9
+./htmlsteg.py -s examples/gnu.html -i examples/Gordon.jpg > /tmp/gnu_gordon.html
10
+./htmlsteg.py -i /tmp/gnu_gordon.html -u > /tmp/out.jpg

BIN
examples/Gordon.jpg View File


+ 1186
- 0
examples/gnu.html
File diff suppressed because it is too large
View File


+ 77
- 0
htmlsteg.py View File

@@ -0,0 +1,77 @@
1
+#!/usr/bin/python
2
+# -*- coding: utf-8 -*-#
3
+
4
+# Copyright 2017 Weber Yann <yann.weber@member.fsf.org>
5
+#
6
+# This file is part of HtmlSteg.
7
+#
8
+#        HtmlSteg is free software: you can redistribute it and/or modify
9
+#        it under the terms of the GNU General Public License as published by
10
+#        the Free Software Foundation, either version 3 of the License, or
11
+#        any later version.
12
+#
13
+#        HtmlSteg is distributed in the hope that it will be useful,
14
+#        but WITHOUT ANY WARRANTY; without even the implied warranty of
15
+#        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
+#        GNU General Public License for more details.
17
+#
18
+#        You should have received a copy of the GNU General Public License
19
+#        along with HtmlSteg.  If not, see <http://www.gnu.org/licenses/>.
20
+#
21
+
22
+import sys
23
+import argparse
24
+
25
+from steg import clean_html, hide, unhide
26
+
27
+if __name__ == '__main__':
28
+    parser = argparse.ArgumentParser(description='Html steganography program')
29
+    parser.add_argument('-u', '--unhide', action='store_const',
30
+        default=False, const=True,
31
+        help="Unhide from input")
32
+    parser.add_argument('-i', '--input', metavar='FILE', type=str,
33
+        default='-', help='Filename or - for stdin')
34
+    parser.add_argument('-o', '--output', metavar='FILE', type=str,
35
+        default='-', help='Filename or - for stdout')
36
+    parser.add_argument('-s', '--hide', metavar='FILE', type=str,
37
+        default='', help="Html filename to hide input in")
38
+    args = parser.parse_args()
39
+
40
+    if len(args.hide) > 0 and args.unhide:
41
+        sys.stderr.write('--unhide and --hide cannot be set at same time')
42
+        parser.print_help()
43
+        exit(1)
44
+
45
+    try:
46
+        if args.output == '-':
47
+            fdout = sys.stdout
48
+        else:
49
+            fdout = open(args.output, 'w+')
50
+        if args.input == '-':
51
+            data_in = bytearray(sys.stdin.read())
52
+        else:
53
+            with open(args.input, 'r') as fdin:
54
+                data_in = fdin.read()
55
+    except Exception as e:
56
+        parser.print_help()
57
+        raise e
58
+
59
+    if args.unhide:
60
+        res = unhide(data_in)
61
+        fdout.write(res)
62
+    elif len(args.hide) > 0:
63
+        try:
64
+            with open(args.hide, 'r') as fdhtml:
65
+                html = fdhtml.read()
66
+        except Exception as e:
67
+            parser.print_help()
68
+            raise e
69
+
70
+        data_in = bytearray(data_in)
71
+        html = clean_html(html)
72
+        html = hide(html, data_in)
73
+        fdout.write(html)
74
+    else:
75
+        parser.print_help()
76
+        exit(1)
77
+

+ 97
- 0
steg.py View File

@@ -0,0 +1,97 @@
1
+# -*- coding: utf-8 -*-#
2
+
3
+# Copyright 2017 Weber Yann <yann.weber@member.fsf.org>
4
+#
5
+# This file is part of HtmlSteg.
6
+#
7
+#        HtmlSteg is free software: you can redistribute it and/or modify
8
+#        it under the terms of the GNU General Public License as published by
9
+#        the Free Software Foundation, either version 3 of the License, or
10
+#        (at your option) any later version.
11
+#
12
+#        HtmlSteg is distributed in the hope that it will be useful,
13
+#        but WITHOUT ANY WARRANTY; without even the implied warranty of
14
+#        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
+#        GNU General Public License for more details.
16
+#
17
+#        You should have received a copy of the GNU General Public License
18
+#        along with HtmlSteg.  If not, see <http://www.gnu.org/licenses/>.
19
+#
20
+
21
+import warnings
22
+
23
+R_CHARS = [' ', "\t", "\n"]
24
+
25
+def clean_html(html):
26
+    '''Clean html squeezing repeating R_CHARS'''
27
+    res = ''
28
+    prev = None
29
+    for c in html:
30
+        if c in R_CHARS and c == prev:
31
+            continue
32
+        prev = c
33
+        res += c
34
+    return res
35
+
36
+def hide(html, payload):
37
+    cur_val = payload[0]
38
+    cur_bit = cur_val & 1
39
+    cur_val >>= 1
40
+    cur_shift = 1
41
+    payload = payload[1:]
42
+
43
+    end = False
44
+    res = ''
45
+    for c in html:
46
+        if not end and c in R_CHARS:
47
+            if cur_bit == 1:
48
+                res += c
49
+            if cur_shift == 8:
50
+                cur_shift = 0
51
+                if len(payload) == 0:
52
+                    end = True
53
+                else:
54
+                    cur_val = payload[0]
55
+                    payload = payload[1:]
56
+            cur_bit = cur_val & 1
57
+            cur_val >>= 1
58
+            cur_shift += 1
59
+        res += c
60
+    if not end:
61
+        if len(payload) > 0:
62
+            warnings.warn(
63
+                'Unable to hide all payload. %d bytes not hidden : "%s"' % (
64
+                    len(payload), repr(payload)))
65
+        if cur_shift != 8:
66
+            warnings.warn(
67
+                'last byte not complete. %d bits missing' % (8 - cur_shift))
68
+    return res
69
+
70
+
71
+def unhide(html):
72
+    res = bytearray()
73
+    cur_byte = 0
74
+    cur_shift = 0
75
+    prev = None
76
+    pre_add = False
77
+    for c in html:
78
+        bit_added = False
79
+        if c in R_CHARS and prev == c:
80
+                #1
81
+                cur_byte += 1 << cur_shift
82
+                bit_added = True
83
+                c = None
84
+        elif prev in R_CHARS:
85
+            #0
86
+            bit_added = True
87
+        if bit_added:
88
+            if cur_shift == 7:
89
+                #print("unhide byte ", bytearray([cur_byte]))
90
+                res += bytearray([cur_byte])
91
+                cur_byte = 0
92
+                cur_shift = 0
93
+            else:
94
+                cur_shift += 1
95
+        prev = c
96
+    return res
97
+        

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