HGKeeper

certificate: Use public key fingerprint to compare certificates
release-2.x.y
2017-03-07, dx

887efbd652d8

Executable

certificate: Use public key fingerprint to compare certificates

This fixes an issue with google talk's certificates and gnutls, where the root
certificate in the provided chain is a slightly different version of the one
that is usually present in the certificate stores, but the SubjectPublicKeyInfo
section is the same.

This adds a PurpleCertificateScheme function, compare_pubkeys, and its wrapper
purple_certificate_compare_pubkeys().

This is only implemented for gnutls, since the NSS plugin only uses the NSS
certificate validation code. Even if that path was reachable from a plugin that
doesn't implement this method, it would return FALSE and behave as if this bug
was never fixed.

The gnutls implementation uses the gnutls_x509_crt_get_key_id() function,
which returns a hash of the SubjectPublicKeyInfo section of the certificate.

In gnutls versions older than 3.4.1, this may be a SHA1 hash, but after that
version SHA256 support was added (without much fanfare - the documentation
barely mentions this at all), and we just use the constant for the best known
algo, which for current versions is just SHA256. Older versions ignore that
flag parameter.

The whole comparison is modeled after the private _gnutls_check_if_same_key(),
which checks if both certificates have the same DN ("unique id") and does a
memcmp() of the raw SPKI section. We don't have direct access to the raw SPKI
section but comparing their fingerprints is good enough.

#! /bin/sh

# Pidgin and Finch: The Pimpin' Penguin IM Clients That're Good for the Soul

# This program is free software; you can redistribute it and/or modify it

# under the terms of the GNU General Public License as published by the Free

# Software Foundation; either version 2 of the License, or (at your option)

# any later version.

# This program is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for

# more details.

# You should have received a copy of the GNU General Public License along with

# this program; if not, write to the Free Software Foundation, Inc., 51

# Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

###############################################################################

# Usage

###############################################################################

# This script uses a config file that can be used to stash common arguments

# passed to configure or environment variables that need to be set before

# configure is called. The configuration file is a simple shell script that

# gets sourced.

# By default, the config file that is used is named 'autogen.args'. This can

# be configured below.

# Available options that are handled are as follow:

# ACLOCAL_FLAGS - command line arguments to pass to aclocal

# AUTOCONF_FLAGS - command line arguments to pass to autoconf

# AUTOHEADER_FLAGS - command line arguments to pass to autoheader

# AUTOMAKE_FLAGS - command line arguments to pass to automake flags

# CONFIGURE_FLAGS - command line arguments to pass to configure

# GLIB_GETTEXTIZE_FLAGS - command line arguments to pass to glib-gettextize

# INTLTOOLIZE_FLAGS - command line arguments to pass to intltoolize

# LIBTOOLIZE_FLAGS - command line arguments to pass to libtoolize

# Other helpful notes:

# If you're using a different c compiler, you can override the environment

# variable in 'autogen.args'. For example, say you're using distcc, just add

# the following to 'autogen.args':

# CC="distcc"

# This will work for any influential environment variable to configure.

###############################################################################

PACKAGE="Pidgin"

ARGS_FILE="autogen.args"

export CFLAGS

export LDFLAGS

libtoolize="libtoolize"

case $(uname -s) in

Darwin*)

libtoolize="glibtoolize"

;;

esac

###############################################################################

# Some helper functions

###############################################################################

check () {

CMD=$1

printf "%s" "checking for ${CMD}... "

BIN=`which ${CMD} 2>/dev/null`

if [ x"${BIN}" = x"" ] ; then

echo "not found."

echo "${CMD} is required to build ${PACKAGE}!"

exit 1;

echo "${BIN}"

}

run_or_die () { # beotch

CMD=$1

shift

OUTPUT=`mktemp autogen-XXXXXX`

printf "running %s %s... " ${CMD} "$*"

${CMD} ${@} >${OUTPUT} 2>&1

if [ $? != 0 ] ; then

echo "failed."

cat ${OUTPUT}

rm -f ${OUTPUT}

exit 1

else

echo "done."

cat ${OUTPUT}

rm -f ${OUTPUT}

}

cleanup () {

rm -f autogen-??????

echo

exit 2

}

###############################################################################

# We really start here, yes, very sneaky!

###############################################################################

trap cleanup 2

FIGLET=`which figlet 2> /dev/null`

if [ x"${FIGLET}" != x"" ] ; then

${FIGLET} -f small ${PACKAGE}

echo "build system is being generated"

else

echo "autogenerating build system for '${PACKAGE}'"

###############################################################################

# Look for our args file

###############################################################################

printf "%s" "checking for ${ARGS_FILE}: "

if [ -f ${ARGS_FILE} ] ; then

echo "found."

printf "%s" "sourcing ${ARGS_FILE}: "

. "`dirname "$0"`"/${ARGS_FILE}

echo "done."

else

echo "not found."

###############################################################################

# Check for our required helpers

###############################################################################

check "$libtoolize"; LIBTOOLIZE=${BIN};

check "glib-gettextize"; GLIB_GETTEXTIZE=${BIN};

check "intltoolize"; INTLTOOLIZE=${BIN};

check "sed"; SED=${BIN};

check "aclocal"; ACLOCAL=${BIN};

check "autoheader"; AUTOHEADER=${BIN};

check "automake"; AUTOMAKE=${BIN};

check "autoconf"; AUTOCONF=${BIN};

###############################################################################

# Run all of our helpers

###############################################################################

run_or_die ${LIBTOOLIZE} ${LIBTOOLIZE_FLAGS:-"-c -f --automake"}

run_or_die ${GLIB_GETTEXTIZE} ${GLIB_GETTEXTIZE_FLAGS:-"--force --copy"}

run_or_die ${INTLTOOLIZE} ${INTLTOOLIZE_FLAGS:-"-c -f --automake"}

# This call to sed is needed to work around an annoying bug in intltool 0.40.6

# See http://developer.pidgin.im/ticket/9520 for details

run_or_die ${SED} -i.bak -e "s:'\^\$\$lang\$\$':\^\$\$lang\$\$:g" po/Makefile.in.in

run_or_die ${ACLOCAL} ${ACLOCAL_FLAGS:-"-I m4macros"}

run_or_die ${AUTOHEADER} ${AUTOHEADER_FLAGS}

run_or_die ${AUTOMAKE} ${AUTOMAKE_FLAGS:-"-a -c --gnu"}

run_or_die ${AUTOCONF} ${AUTOCONF_FLAGS}

###############################################################################

# Run configure

###############################################################################

if test -z "$NOCONFIGURE"; then

echo "running ./configure ${CONFIGURE_FLAGS} $@"

./configure ${CONFIGURE_FLAGS} $@

pidgin/pidgin