diff options
Diffstat (limited to 'contrib/verify-commits/gpg.sh')
-rwxr-xr-x | contrib/verify-commits/gpg.sh | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/contrib/verify-commits/gpg.sh b/contrib/verify-commits/gpg.sh new file mode 100755 index 0000000000..b01e2a6d39 --- /dev/null +++ b/contrib/verify-commits/gpg.sh @@ -0,0 +1,59 @@ +#!/bin/sh +# Copyright (c) 2014-2016 The Bitcoin Core developers +# Distributed under the MIT software license, see the accompanying +# file COPYING or http://www.opensource.org/licenses/mit-license.php. + +INPUT=$(cat /dev/stdin) +VALID=false +REVSIG=false +IFS=' +' +if [ "$BITCOIN_VERIFY_COMMITS_ALLOW_SHA1" = 1 ]; then + GPG_RES="$(echo "$INPUT" | gpg --trust-model always "$@" 2>/dev/null)" +else + # Note how we've disabled SHA1 with the --weak-digest option, disabling + # signatures - including selfsigs - that use SHA1. While you might think that + # collision attacks shouldn't be an issue as they'd be an attack on yourself, + # in fact because what's being signed is a commit object that's + # semi-deterministically generated by untrusted input (the pull-req) in theory + # an attacker could construct a pull-req that results in a commit object that + # they've created a collision for. Not the most likely attack, but preventing + # it is pretty easy so we do so as a "belt-and-suspenders" measure. + GPG_RES="" + for LINE in "$(gpg --version)"; do + case "$LINE" in + "gpg (GnuPG) 1.4.1"*|"gpg (GnuPG) 2.0."*) + echo "Please upgrade to at least gpg 2.1.10 to check for weak signatures" > /dev/stderr + GPG_RES="$(echo "$INPUT" | gpg --trust-model always "$@" 2>/dev/null)" + ;; + # We assume if you're running 2.1+, you're probably running 2.1.10+ + # gpg will fail otherwise + # We assume if you're running 1.X, it is either 1.4.1X or 1.4.20+ + # gpg will fail otherwise + esac + done + [ "$GPG_RES" = "" ] && GPG_RES="$(echo "$INPUT" | gpg --trust-model always --weak-digest sha1 "$@" 2>/dev/null)" +fi +for LINE in $(echo "$GPG_RES"); do + case "$LINE" in + "[GNUPG:] VALIDSIG "*) + while read KEY; do + [ "${LINE#?GNUPG:? VALIDSIG * * * * * * * * * }" = "$KEY" ] && VALID=true + done < ./contrib/verify-commits/trusted-keys + ;; + "[GNUPG:] REVKEYSIG "*) + [ "$BITCOIN_VERIFY_COMMITS_ALLOW_REVSIG" != 1 ] && exit 1 + REVSIG=true + GOODREVSIG="[GNUPG:] GOODSIG ${LINE#* * *}" + ;; + esac +done +if ! $VALID; then + exit 1 +fi +if $VALID && $REVSIG; then + echo "$INPUT" | gpg --trust-model always "$@" 2>/dev/null | grep "\[GNUPG:\] \(NEWSIG\|SIG_ID\|VALIDSIG\)" + echo "$GOODREVSIG" +else + echo "$INPUT" | gpg --trust-model always "$@" 2>/dev/null +fi |