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Thomas De Schampheleire

changeset: fix XSS vulnerability in parent-child navigation

The 'Parent Rev.' - 'Child Rev.' links on changesets and in the file browser
normally immediately jump to the correct revision upon click. But, if there
are multiple candidates, e.g. two children of a commit, then a list of
revisions is shown as hyperlinks instead.

These hyperlinks have a 'title' attribute containing the full commit message
of the corresponding commit. When this commit message contains characters
special to HTML, like ", >, etc. they were added literally to the HTML code.

This can lead to a cross-site scripting (XSS) vulnerability when an attacker
has write access to a repository. They could craft a special commit message
that would introduce HTML and/or JavaScript code when the commit is listed
in such 'parent-child' navigation links.

Escape the commit message before using it further.

#!/usr/bin/env bash
# Validate the specified commits against test suite and other checks.

if [ -n "$VIRTUAL_ENV" ]; then
    echo "Please run this script from outside a virtualenv."
    exit 1
fi

if ! hg update --check -q .; then
    echo "Working dir is not clean, please commit/revert changes first."
    exit 1
fi

venv=$(mktemp -d kallithea-validatecommits-env-XXXXXX)
resultfile=$(mktemp kallithea-validatecommits-result-XXXXXX)
echo > "$resultfile"

cleanup()
{
    rm -rf /tmp/kallithea-test*
    rm -rf "$venv"
}
finish()
{
    cleanup
    # print (possibly intermediate) results
    cat "$resultfile"
    rm "$resultfile"
}
trap finish EXIT

for rev in $(hg log -r "$1" -T '{node}\n'); do
    hg log -r "$rev"
    hg update "$rev"

    cleanup
    virtualenv -p "$(command -v python2)" "$venv"
    source "$venv/bin/activate"
    pip install --upgrade pip setuptools
    pip install -e .
    pip install -r dev_requirements.txt
    pip install python-ldap python-pam

    # run-all-cleanup
    scripts/run-all-cleanup
    if ! hg update --check -q .; then
        echo "run-all-cleanup did not give clean results!"
        result="NOK"
        hg diff
        hg revert -a
    else
        result=" OK"
    fi
    echo "$result: $rev (run-all-cleanup)" >> "$resultfile"

    # pytest
    if py.test; then
        result=" OK"
    else
        result="NOK"
    fi
    echo "$result: $rev (pytest)" >> "$resultfile"

    deactivate
    echo
done