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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.
Martin von Zweigbergk - - Load All Authors

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r27316:777f668e default
r29560:303e9300 default
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test-merge-local.t
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Adrian Buehlmann
tests: unify test-merge-local
 r12258 $ hg init
Revision 0:
$ echo "unchanged" > unchanged
$ echo "remove me" > remove
$ echo "copy me" > copy
$ echo "move me" > move
$ for i in 1 2 3 4 5 6 7 8 9; do
> echo "merge ok $i" >> zzz1_merge_ok
> done
$ echo "merge bad" > zzz2_merge_bad
$ hg ci -Am "revision 0"
adding copy
adding move
adding remove
adding unchanged
adding zzz1_merge_ok
adding zzz2_merge_bad
Revision 1:
$ hg rm remove
$ hg mv move moved
$ hg cp copy copied
$ echo "added" > added
$ hg add added
$ echo "new first line" > zzz1_merge_ok
$ hg cat zzz1_merge_ok >> zzz1_merge_ok
$ echo "new last line" >> zzz2_merge_bad
$ hg ci -m "revision 1"
Local changes to revision 0:
$ hg co 0
4 files updated, 0 files merged, 3 files removed, 0 files unresolved
$ echo "new last line" >> zzz1_merge_ok
$ echo "another last line" >> zzz2_merge_bad
$ hg diff --nodates | grep "^[+-][^<>]"
--- a/zzz1_merge_ok
+++ b/zzz1_merge_ok
+new last line
--- a/zzz2_merge_bad
+++ b/zzz2_merge_bad
+another last line
$ hg st
M zzz1_merge_ok
M zzz2_merge_bad
Local merge with bad merge tool:
$ HGMERGE=false hg co
merging zzz1_merge_ok
merging zzz2_merge_bad
merging zzz2_merge_bad failed!
3 files updated, 1 files merged, 2 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
Matt Mackall
tests: add exit codes to unified tests
 r12316 [1]
Adrian Buehlmann
tests: unify test-merge-local
 r12258
Martin von Zweigbergk
merge: refuse update/merge if there are unresolved conflicts (BC)...
 r27316 $ hg resolve -m
(no more unresolved files)
Adrian Buehlmann
tests: unify test-merge-local
 r12258 $ hg co 0
merging zzz1_merge_ok
merging zzz2_merge_bad
Siddharth Agarwal
simplemerge: move conflict warning message to filemerge...
 r26614 warning: conflicts while merging zzz2_merge_bad! (edit, then use 'hg resolve --mark')
Adrian Buehlmann
tests: unify test-merge-local
 r12258 2 files updated, 1 files merged, 3 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
Matt Mackall
tests: add exit codes to unified tests
 r12316 [1]
Adrian Buehlmann
tests: unify test-merge-local
 r12258
$ hg diff --nodates | grep "^[+-][^<>]"
--- a/zzz1_merge_ok
+++ b/zzz1_merge_ok
+new last line
--- a/zzz2_merge_bad
+++ b/zzz2_merge_bad
+another last line
+=======
$ hg st
M zzz1_merge_ok
M zzz2_merge_bad
? zzz2_merge_bad.orig
Local merge with conflicts:
Martin von Zweigbergk
merge: refuse update/merge if there are unresolved conflicts (BC)...
 r27316 $ hg resolve -m
(no more unresolved files)
Adrian Buehlmann
tests: unify test-merge-local
 r12258 $ hg co
merging zzz1_merge_ok
merging zzz2_merge_bad
Siddharth Agarwal
simplemerge: move conflict warning message to filemerge...
 r26614 warning: conflicts while merging zzz2_merge_bad! (edit, then use 'hg resolve --mark')
Adrian Buehlmann
tests: unify test-merge-local
 r12258 3 files updated, 1 files merged, 2 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
Matt Mackall
tests: add exit codes to unified tests
 r12316 [1]
Adrian Buehlmann
tests: unify test-merge-local
 r12258
Martin von Zweigbergk
merge: refuse update/merge if there are unresolved conflicts (BC)...
 r27316 $ hg resolve -m
(no more unresolved files)
Christian Delahousse
filemerge: choose where .orig files are kept...
 r26941 $ hg co 0 --config 'ui.origbackuppath=.hg/origbackups'
Adrian Buehlmann
tests: unify test-merge-local
 r12258 merging zzz1_merge_ok
merging zzz2_merge_bad
Siddharth Agarwal
simplemerge: move conflict warning message to filemerge...
 r26614 warning: conflicts while merging zzz2_merge_bad! (edit, then use 'hg resolve --mark')
Adrian Buehlmann
tests: unify test-merge-local
 r12258 2 files updated, 1 files merged, 3 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges
Matt Mackall
tests: add exit codes to unified tests
 r12316 [1]
Adrian Buehlmann
tests: unify test-merge-local
 r12258
Christian Delahousse
filemerge: choose where .orig files are kept...
 r26941 Are orig files from the last commit where we want them?
$ ls .hg/origbackups
zzz2_merge_bad.orig
Adrian Buehlmann
tests: unify test-merge-local
 r12258 $ hg diff --nodates | grep "^[+-][^<>]"
--- a/zzz1_merge_ok
+++ b/zzz1_merge_ok
+new last line
--- a/zzz2_merge_bad
+++ b/zzz2_merge_bad
+another last line
+=======
+=======
+new last line
+=======
$ hg st
M zzz1_merge_ok
M zzz2_merge_bad
? zzz2_merge_bad.orig
Local merge without conflicts:
$ hg revert zzz2_merge_bad
Martin von Zweigbergk
merge: refuse update/merge if there are unresolved conflicts (BC)...
 r27316 $ hg resolve -m
(no more unresolved files)
Adrian Buehlmann
tests: unify test-merge-local
 r12258 $ hg co
merging zzz1_merge_ok
4 files updated, 1 files merged, 2 files removed, 0 files unresolved
$ hg diff --nodates | grep "^[+-][^<>]"
--- a/zzz1_merge_ok
+++ b/zzz1_merge_ok
+new last line
$ hg st
M zzz1_merge_ok
? zzz2_merge_bad.orig