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sslutil: require TLS 1.1+ when supported...
sslutil: require TLS 1.1+ when supported Currently, Mercurial will use TLS 1.0 or newer when connecting to remote servers, selecting the highest TLS version supported by both peers. On older Pythons, only TLS 1.0 is available. On newer Pythons, TLS 1.1 and 1.2 should be available. Security professionals recommend avoiding TLS 1.0 if possible. PCI DSS 3.1 "strongly encourages" the use of TLS 1.2. Known attacks like BEAST and POODLE exist against TLS 1.0 (although mitigations are available and properly configured servers aren't vulnerable). I asked Eric Rescorla - Mozilla's resident crypto expert - whether Mercurial should drop support for TLS 1.0. His response was "if you can get away with it." Essentially, a number of servers on the Internet don't support TLS 1.1+. This is why web browsers continue to support TLS 1.0 despite desires from security experts. This patch changes Mercurial's default behavior on modern Python versions to require TLS 1.1+, thus avoiding known security issues with TLS 1.0 and making Mercurial more secure by default. Rather than drop TLS 1.0 support wholesale, we still allow TLS 1.0 to be used if configured. This is a compromise solution - ideally we'd disallow TLS 1.0. However, since we're not sure how many Mercurial servers don't support TLS 1.1+ and we're not sure how much user inconvenience this change will bring, I think it is prudent to ship an escape hatch that still allows usage of TLS 1.0. In the default case our users get better security. In the worst case, they are no worse off than before this patch. This patch has no effect when running on Python versions that don't support TLS 1.1+. As the added test shows, connecting to a server that doesn't support TLS 1.1+ will display a warning message with a link to our wiki, where we can guide people to configure their client to allow less secure connections.
Matt Mackall - - Load All Authors

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test-http-branchmap.t
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Matt Mackall
tests: replace exit 80 with #require
 r22046 #require killdaemons
Matt Mackall
tests: unify test-http-branchmap
 r12447
$ hgserve() {
Patrick Mezard
test-http-branchmap: enable on Windows...
 r17467 > hg serve -a localhost -p $HGPORT1 -d --pid-file=hg.pid \
> -E errors.log -v $@ > startup.log
> # Grepping hg serve stdout would hang on Windows
> grep -v 'listening at' startup.log
Matt Mackall
tests: unify test-http-branchmap
 r12447 > cat hg.pid >> "$DAEMON_PIDS"
> }
$ hg init a
$ hg --encoding utf-8 -R a branch æ
Mads Kiilerich
tests: use (esc) for all non-ASCII test output
 r12942 marked working directory as branch \xc3\xa6 (esc)
Matt Mackall
branch: warn on branching
 r15615 (branches are permanent and global, did you want a bookmark?)
Matt Mackall
tests: unify test-http-branchmap
 r12447 $ echo foo > a/foo
$ hg -R a ci -Am foo
adding foo
$ hgserve -R a --config web.push_ssl=False --config web.allow_push=* --encoding latin1
$ hg --encoding utf-8 clone http://localhost:$HGPORT1 b
requesting all changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
Mads Kiilerich
tests: use (esc) for all non-ASCII test output
 r12942 updating to branch \xc3\xa6 (esc)
Matt Mackall
tests: unify test-http-branchmap
 r12447 1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg --encoding utf-8 -R b log
changeset: 0:867c11ce77b8
Mads Kiilerich
tests: use (esc) for all non-ASCII test output
 r12942 branch: \xc3\xa6 (esc)
Matt Mackall
tests: unify test-http-branchmap
 r12447 tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: foo
$ echo bar >> b/foo
$ hg -R b ci -m bar
$ hg --encoding utf-8 -R b push
Brodie Rao
url: add trailing slashes to URLs with hostnames that don't have one...
 r13815 pushing to http://localhost:$HGPORT1/
Matt Mackall
tests: unify test-http-branchmap
 r12447 searching for changes
remote: adding changesets
remote: adding manifests
remote: adding file changes
remote: added 1 changesets with 1 changes to 1 files
$ hg -R a --encoding utf-8 log
changeset: 1:58e7c90d67cb
Mads Kiilerich
tests: use (esc) for all non-ASCII test output
 r12942 branch: \xc3\xa6 (esc)
Matt Mackall
tests: unify test-http-branchmap
 r12447 tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: bar
changeset: 0:867c11ce77b8
Mads Kiilerich
tests: use (esc) for all non-ASCII test output
 r12942 branch: \xc3\xa6 (esc)
Matt Mackall
tests: unify test-http-branchmap
 r12447 user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: foo
Matt Mackall
tests: drop explicit $TESTDIR from executables...
 r25472 $ killdaemons.py hg.pid
Matt Mackall
tests: unify test-http-branchmap
 r12447
verify 7e7d56fe4833 (encoding fallback in branchmap to maintain compatibility with 1.3.x)
$ cat <<EOF > oldhg
> import sys
> from mercurial import ui, hg, commands
>
> class StdoutWrapper(object):
> def __init__(self, stdout):
> self._file = stdout
>
> def write(self, data):
> if data == '47\n':
> # latin1 encoding is one %xx (3 bytes) shorter
> data = '44\n'
> elif data.startswith('%C3%A6 '):
> # translate to latin1 encoding
> data = '%%E6 %s' % data[7:]
> self._file.write(data)
>
> def __getattr__(self, name):
> return getattr(self._file, name)
>
> sys.stdout = StdoutWrapper(sys.stdout)
> sys.stderr = StdoutWrapper(sys.stderr)
>
> myui = ui.ui()
> repo = hg.repository(myui, 'a')
Idan Kamara
serve: add --cmdserver option to communicate with hg over a pipe
 r14647 > commands.serve(myui, repo, stdio=True, cmdserver=False)
Matt Mackall
tests: unify test-http-branchmap
 r12447 > EOF
$ echo baz >> b/foo
$ hg -R b ci -m baz
$ hg push -R b -e 'python oldhg' ssh://dummy/ --encoding latin1
pushing to ssh://dummy/
searching for changes
remote: adding changesets
remote: adding manifests
remote: adding file changes
remote: added 1 changesets with 1 changes to 1 files