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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.

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test-issue672.t
100 lines | 2.9 KiB | text/troff | Tads3Lexer
Matt Mackall
urls: bulk-change BTS urls to new location
r26420 https://bz.mercurial-scm.org/672
Adrian Buehlmann
tests: unify test-issue*
r12195
# 0-2-4
# \ \ \
# 1-3-5
#
# rename in #1, content change in #4.
$ hg init
$ touch 1
$ touch 2
$ hg commit -Am init # 0
adding 1
adding 2
$ hg rename 1 1a
$ hg commit -m rename # 1
$ hg co -C 0
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo unrelated >> 2
$ hg ci -m unrelated1 # 2
created new head
$ hg merge --debug 1
searching for copies back to rev 1
unmatched files in other:
1a
Thomas Arendsen Hein
merge: show renamed on one and deleted on the other side in debug output
r16795 all copies found (* = to merge, ! = divergent, % = renamed and deleted):
Siddharth Agarwal
copies: make debug messages more sensible...
r18135 src: '1' -> dst: '1a'
Adrian Buehlmann
tests: unify test-issue*
r12195 checking for directory renames
resolving manifests
Siddharth Agarwal
manifestmerge: pass in branchmerge and force separately...
r18605 branchmerge: True, force: False, partial: False
Martin Geisler
merge: make debug output easier to read...
r15625 ancestor: 81f4b099af3d, local: c64f439569a9+, remote: c12dcd37c90a
Adrian Buehlmann
tests: unify test-issue*
r12195 1: other deleted -> r
Bryan O'Sullivan
tests: update test output (will be folded into parent)
r18631 removing 1
Mads Kiilerich
merge: change debug logging - test output changes but no real changes...
r21391 1a: remote created -> g
Bryan O'Sullivan
tests: update test output (will be folded into parent)
r18631 getting 1a
Martin von Zweigbergk
merge: make 'keep' message more descriptive...
r23482 2: remote unchanged -> k
Adrian Buehlmann
tests: unify test-issue*
r12195 1 files updated, 0 files merged, 1 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg ci -m merge1 # 3
$ hg co -C 2
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo hello >> 1
$ hg ci -m unrelated2 # 4
created new head
$ hg co -C 3
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge -y --debug 4
searching for copies back to rev 1
unmatched files in local:
1a
Thomas Arendsen Hein
merge: show renamed on one and deleted on the other side in debug output
r16795 all copies found (* = to merge, ! = divergent, % = renamed and deleted):
Siddharth Agarwal
copies: make debug messages more sensible...
r18135 src: '1' -> dst: '1a' *
Adrian Buehlmann
tests: unify test-issue*
r12195 checking for directory renames
resolving manifests
Siddharth Agarwal
manifestmerge: pass in branchmerge and force separately...
r18605 branchmerge: True, force: False, partial: False
Martin Geisler
merge: make debug output easier to read...
r15625 ancestor: c64f439569a9, local: e327dca35ac8+, remote: 746e9549ea96
Mads Kiilerich
merge: change debug logging - test output changes but no real changes...
r21391 preserving 1a for resolve of 1a
Matt Harbison
tests: flag Windows specific lines about background closing as optional
r28318 starting 4 threads for background file closing (?)
Siddharth Agarwal
merge.mergestate: perform all premerges before any merges (BC)...
r26618 1a: local copied/moved from 1 -> m (premerge)
Siddharth Agarwal
filemerge: add debug output for whether this is a change/delete conflict...
r27161 picked tool ':merge' for 1a (binary False symlink False changedelete False)
Adrian Buehlmann
tests: unify test-issue*
r12195 merging 1a and 1 to 1a
Durham Goode
merge: add file ancestor linknode to mergestate...
r28011 my 1a@e327dca35ac8+ other 1@746e9549ea96 ancestor 1@c64f439569a9
Adrian Buehlmann
tests: unify test-issue*
r12195 premerge successful
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg co -C 4
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge -y --debug 3
searching for copies back to rev 1
unmatched files in other:
1a
Thomas Arendsen Hein
merge: show renamed on one and deleted on the other side in debug output
r16795 all copies found (* = to merge, ! = divergent, % = renamed and deleted):
Siddharth Agarwal
copies: make debug messages more sensible...
r18135 src: '1' -> dst: '1a' *
Adrian Buehlmann
tests: unify test-issue*
r12195 checking for directory renames
resolving manifests
Siddharth Agarwal
manifestmerge: pass in branchmerge and force separately...
r18605 branchmerge: True, force: False, partial: False
Martin Geisler
merge: make debug output easier to read...
r15625 ancestor: c64f439569a9, local: 746e9549ea96+, remote: e327dca35ac8
Mads Kiilerich
merge: change debug logging - test output changes but no real changes...
r21391 preserving 1 for resolve of 1a
removing 1
Matt Harbison
tests: flag Windows specific lines about background closing as optional
r28318 starting 4 threads for background file closing (?)
Siddharth Agarwal
merge.mergestate: perform all premerges before any merges (BC)...
r26618 1a: remote moved from 1 -> m (premerge)
Siddharth Agarwal
filemerge: add debug output for whether this is a change/delete conflict...
r27161 picked tool ':merge' for 1a (binary False symlink False changedelete False)
Adrian Buehlmann
tests: unify test-issue*
r12195 merging 1 and 1a to 1a
Durham Goode
merge: add file ancestor linknode to mergestate...
r28011 my 1a@746e9549ea96+ other 1a@e327dca35ac8 ancestor 1@c64f439569a9
Adrian Buehlmann
tests: unify test-issue*
r12195 premerge successful
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)