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http://bugs.exim.org/show_bug.cgi?id=963
Summary: DKIM failes verifying rsa-sha1/simple body with only
newlines
Product: Exim
Version: 4.71
Platform: x86
OS/Version: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Content Scanning
AssignedTo: tom@???
ReportedBy: wbreyha@???
CC: exim-dev@???
Hi!
A friend sent me a testmail signed with his qmail *sigh*. Signature looks like:
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=xxxxx.net; h=message-id
:date:from:mime-version:to:subject:content-type
:content-transfer-encoding; s=default; bh=uoq1oCgLlTqpdDX/iUbLy7
J1Wic=; b=ImZU6gr6YyO/wtwjrhJcW2FHABeQ6V51C9GbjYqAB1QBGmnj6U27ya
ZLyvKrKmwYti+/YGkHqHrmAUglMMalu6EAef4f6BK6KE+CU/t1iDFhwUdqAL+ziz
Message Body contains only newlines:
# hexdump -C dkimmail.eml
00000b50 6c 69 64 0d 0a 20 2a 20 2d 30 2e 31 20 44 4b 49 |lid.. * -0.1 DKI|
00000b60 4d 5f 56 41 4c 49 44 20 4d 65 73 73 61 67 65 20 |M_VALID Message |
00000b70 68 61 73 20 61 74 20 6c 65 61 73 74 20 6f 6e 65 |has at least one|
00000b80 20 76 61 6c 69 64 20 44 4b 49 4d 20 6f 72 20 44 | valid DKIM or D|
00000b90 4b 20 73 69 67 6e 61 74 75 72 65 0d 0a 20 2a 20 |K signature.. * |
00000ba0 20 30 2e 30 20 54 56 44 5f 53 50 41 43 45 5f 52 | 0.0 TVD_SPACE_R|
00000bb0 41 54 49 4f 20 54 56 44 5f 53 50 41 43 45 5f 52 |ATIO TVD_SPACE_R|
00000bc0 41 54 49 4f 0d 0a 0d 0a 0d 0a 0d 0a |ATIO........|
00000bcc
As you can see in the last part of the header ....
* -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature
... SpamAssassin 3.3.0/Mail::DKIM 0.37 verified the mail successfully.
It looks like a body containing only newlines using rsa-sha1/simple failes to
verify in exim.
Regards, Wolfgang
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