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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.
Pierre-Yves David - - Load All Authors

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r25482:95f49013 default
r29560:303e9300 default
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test-debugbuilddag.t
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$ hg init
$ hg debugbuilddag '+2:f +3:p2 @temp <f+4 @default /p2 +2' \
> --config extensions.progress= --config progress.assume-tty=1 \
> --config progress.delay=0 --config progress.refresh=0 \
> --config progress.format=topic,bar,number \
> --config progress.width=60
\r (no-eol) (esc)
building [ ] 0/12\r (no-eol) (esc)
building [ ] 0/12\r (no-eol) (esc)
building [==> ] 1/12\r (no-eol) (esc)
building [==> ] 1/12\r (no-eol) (esc)
building [======> ] 2/12\r (no-eol) (esc)
building [=========> ] 3/12\r (no-eol) (esc)
building [=============> ] 4/12\r (no-eol) (esc)
building [=============> ] 4/12\r (no-eol) (esc)
building [=============> ] 4/12\r (no-eol) (esc)
building [================> ] 5/12\r (no-eol) (esc)
building [====================> ] 6/12\r (no-eol) (esc)
building [=======================> ] 7/12\r (no-eol) (esc)
building [===========================> ] 8/12\r (no-eol) (esc)
building [===========================> ] 8/12\r (no-eol) (esc)
building [==============================> ] 9/12\r (no-eol) (esc)
building [==================================> ] 10/12\r (no-eol) (esc)
building [=====================================> ] 11/12\r (no-eol) (esc)
\r (no-eol) (esc)
tags
$ cat .hg/localtags
66f7d451a68b85ed82ff5fcc254daf50c74144bd f
bebd167eb94d257ace0e814aeb98e6972ed2970d p2
dag
$ hg debugdag -t -b
+2:f
+3:p2
@temp*f+3
@default*/p2+2:tip
tip
$ hg id
000000000000
glog
$ hg log -G --template '{rev}: {desc} [{branches}] @ {date}\n'
o 11: r11 [] @ 11.00
|
o 10: r10 [] @ 10.00
|
o 9: r9 [] @ 9.00
|\
| o 8: r8 [temp] @ 8.00
| |
| o 7: r7 [temp] @ 7.00
| |
| o 6: r6 [temp] @ 6.00
| |
| o 5: r5 [temp] @ 5.00
| |
o | 4: r4 [] @ 4.00
| |
o | 3: r3 [] @ 3.00
| |
o | 2: r2 [] @ 2.00
|/
o 1: r1 [] @ 1.00
|
o 0: r0 [] @ 0.00
overwritten files, starting on a non-default branch
$ rm -r .hg
$ hg init
$ hg debugbuilddag '@start.@default.:f +3:p2 @temp <f+4 @default /p2 +2' -q -o
tags
$ cat .hg/localtags
f778700ebd50fcf282b23a4446bd155da6453eb6 f
bbccf169769006e2490efd2a02f11c3d38d462bd p2
dag
$ hg debugdag -t -b
@start+1
@default+1:f
+3:p2
@temp*f+3
@default*/p2+2:tip
tip
$ hg id
000000000000
glog
$ hg log -G --template '{rev}: {desc} [{branches}] @ {date}\n'
o 11: r11 [] @ 11.00
|
o 10: r10 [] @ 10.00
|
o 9: r9 [] @ 9.00
|\
| o 8: r8 [temp] @ 8.00
| |
| o 7: r7 [temp] @ 7.00
| |
| o 6: r6 [temp] @ 6.00
| |
| o 5: r5 [temp] @ 5.00
| |
o | 4: r4 [] @ 4.00
| |
o | 3: r3 [] @ 3.00
| |
o | 2: r2 [] @ 2.00
|/
o 1: r1 [] @ 1.00
|
o 0: r0 [start] @ 0.00
glog of
$ hg log -G --template '{rev}: {desc} [{branches}]\n' of
o 11: r11 []
|
o 10: r10 []
|
o 9: r9 []
|\
| o 8: r8 [temp]
| |
| o 7: r7 [temp]
| |
| o 6: r6 [temp]
| |
| o 5: r5 [temp]
| |
o | 4: r4 []
| |
o | 3: r3 []
| |
o | 2: r2 []
|/
o 1: r1 []
|
o 0: r0 [start]
tags
$ hg tags -v
tip 11:9ffe238a67a2
p2 4:bbccf1697690 local
f 1:f778700ebd50 local
cat of
$ hg cat of --rev tip
r11
new and mergeable files
$ rm -r .hg
$ hg init
$ hg debugbuilddag '+2:f +3:p2 @temp <f+4 @default /p2 +2' -q -mn
dag
$ hg debugdag -t -b
+2:f
+3:p2
@temp*f+3
@default*/p2+2:tip
tip
$ hg id
000000000000
glog
$ hg log -G --template '{rev}: {desc} [{branches}] @ {date}\n'
o 11: r11 [] @ 11.00
|
o 10: r10 [] @ 10.00
|
o 9: r9 [] @ 9.00
|\
| o 8: r8 [temp] @ 8.00
| |
| o 7: r7 [temp] @ 7.00
| |
| o 6: r6 [temp] @ 6.00
| |
| o 5: r5 [temp] @ 5.00
| |
o | 4: r4 [] @ 4.00
| |
o | 3: r3 [] @ 3.00
| |
o | 2: r2 [] @ 2.00
|/
o 1: r1 [] @ 1.00
|
o 0: r0 [] @ 0.00
glog mf
$ hg log -G --template '{rev}: {desc} [{branches}]\n' mf
o 11: r11 []
|
o 10: r10 []
|
o 9: r9 []
|\
| o 8: r8 [temp]
| |
| o 7: r7 [temp]
| |
| o 6: r6 [temp]
| |
| o 5: r5 [temp]
| |
o | 4: r4 []
| |
o | 3: r3 []
| |
o | 2: r2 []
|/
o 1: r1 []
|
o 0: r0 []
man r4
$ hg manifest -r4
mf
nf0
nf1
nf2
nf3
nf4
cat r4 mf
$ hg cat -r4 mf
0 r0
1
2 r1
3
4 r2
5
6 r3
7
8 r4
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
man r8
$ hg manifest -r8
mf
nf0
nf1
nf5
nf6
nf7
nf8
cat r8 mf
$ hg cat -r8 mf
0 r0
1
2 r1
3
4
5
6
7
8
9
10 r5
11
12 r6
13
14 r7
15
16 r8
17
18
19
20
21
22
23
man
$ hg manifest --rev tip
mf
nf0
nf1
nf10
nf11
nf2
nf3
nf4
nf5
nf6
nf7
nf8
nf9
cat mf
$ hg cat mf --rev tip
0 r0
1
2 r1
3
4 r2
5
6 r3
7
8 r4
9
10 r5
11
12 r6
13
14 r7
15
16 r8
17
18 r9
19
20 r10
21
22 r11
23