spctl always rejects signed executables (not bundles)

Number:rdar://25618668 Date Originated:2016-04-08
Status:Open Resolved:
Product:Mac OS X Product Version:10.11.4
Classification:bug Reproducible:always
The following illustrates the problem. Try to validate security policy for an executable provided and signed by Apple itself, say /usr/bin/perl:

$ spctl -a -vvvv -t exec /usr/bin/perl
/usr/bin/perl: rejected
source=obsolete resource envelope
origin=Software Signing
$ spctl -a --raw /usr/bin/perl
/usr/bin/perl: rejected
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
		<string>obsolete resource envelope</string>
$ codesign -vvvv /usr/bin/perl
/usr/bin/perl: valid on disk
/usr/bin/perl: satisfies its Designated Requirement
$ codesign -display --requirements - --verbose=4 /usr/bin/perl
Format=Mach-O universal (i386 x86_64)
CodeDirectory v=20100 size=223 flags=0x0(none) hashes=6+2 location=embedded
Platform identifier=1
Hash type=sha1 size=20
CandidateCDHash sha1=9300c0e021f7b525002e4b83f9c1cdb4201da168
Hash choices=sha1
Signature size=4105
Authority=Software Signing
Authority=Apple Code Signing Certification Authority
Authority=Apple Root CA
Info.plist=not bound
TeamIdentifier=not set
Sealed Resources=none

Here's what syslog entries say:

4/8/16 00:18:34.674 syspolicyd[905]: assessment denied for perl
com.apple.message.domain: com.apple.security.assessment.outcome2
com.apple.message.signature2: bundle:UNBUNDLED
com.apple.message.signature3: perl
com.apple.message.signature5: UNKNOWN
com.apple.message.signature4: 1
com.apple.message.signature: denied:obsolete resource envelope
SenderMachUUID: 1AE9CFA9-82E6-.......

4/8/16 00:18:34.674 syspolicyd[905]: com.apple.message.domain: com.apple.security.assessment.whitelist2
com.apple.message.signature: perl-55554944f0661fba7f9c37c98f8302dcb246618d
com.apple.message.signature2: 9300c0e021f7b525002e4b83f9c1cdb4201da168
com.apple.message.result: fail
com.apple.message.signature3: f112f9a3fcbce80855d1f43b0d5d230f48fae84c
com.apple.message.reason: -67002
SenderMachUUID: 1AE9CFA9-82E6-.......

Apple responded:

Please know that our engineering team has determined that this issue behaves as intended based on the information provided.

Gatekeeper (as of 10.11.4) rejects anything that isn’t an app (or “like” an app, such a widget). This is part of a general hardening effort.


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