SSL证书和elinks

Question

我有时使用elinks浏览网页，但由于SSL错误的原因，某些https站点无法加载。

例如，https://www.rust-lang.org在elinks中无法加载，但在其他浏览器如chromium和firefox中可以正常工作。

使用命令行检查https://www.rust-lang.org证书会得到非常短的输出。

$ echo | openssl s_client -connect www.rust-lang.org:443 2>/dev/null
CONNECTED(00000003)
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 7 bytes and written 297 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : 0000
    Session-ID: 
    Session-ID-ctx: 
    Master-Key: 
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1459658221
    Timeout   : 300 (sec)
    Verify return code: 0 (ok)
---

作为对比，谷歌的输出如下：

$ echo | openssl s_client -connect www.google.com:443 2>/dev/null
CONNECTED(00000003)
---
Certificate chain
 0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com
   i:/C=US/O=Google Inc/CN=Google Internet Authority G2
 1 s:/C=US/O=Google Inc/CN=Google Internet Authority G2
   i:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
 2 s:/C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
   i:/C=US/O=Equifax/OU=Equifax Secure Certificate Authority
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com
issuer=/C=US/O=Google Inc/CN=Google Internet Authority G2
---
No client certificate CA names sent
---
SSL handshake has read 3727 bytes and written 423 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES128-GCM-SHA256
    Session-ID: BBBB89FD38DF58981900A70A2F92A01E57888CF80B71AE19DE5F92EDE389D7FE
    Session-ID-ctx: 
    Master-Key: 80B4C5C3F81C7AFDAA226BB0285E9F9088737151CCB4EA742328C727363F9663997E68D757CB73B79EF8E3C90B622E12
    Key-Arg   : None
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 100800 (seconds)
    TLS session ticket:
    0000 - ee 03 90 3e 12 a6 14 ba-f9 db 39 f7 6f 3c bf 58   ...>......9.o<.X
    0010 - 32 5d 0a 6f 08 cf 17 f9-16 49 91 c3 4f 99 50 01   2].o.....I..O.P.
    0020 - 6a 90 47 0a 7d 62 5e b8-26 ef 21 9f f3 df a9 35   j.G.}b^.&.!....5
    0030 - 17 90 53 cf 6a 1e d8 e7-ef d9 7a fc ea 80 c0 74   ..S.j.....z....t
    0040 - c2 ee ba e4 5c ef 04 38-45 58 75 f6 7f f4 cd 78   ....\..8EXu....x
    0050 - eb 31 5d be c2 c9 bb cd-dc c1 13 cc 81 84 48 39   .1]...........H9
    0060 - 12 52 43 ae c6 24 1b 6e-85 7f 23 90 ff 80 9c 11   .RC..$.n..#.....
    0070 - 49 e2 b4 c1 bf 32 08 e5-c4 55 84 de 46 77 d0 a1   I....2...U..Fw..
    0080 - 92 7b 7c 1b 54 a1 49 c2-b0 d7 b9 f8 65 d2 1d 19   .{|.T.I.....e...
    0090 - 2d 8e 5a 66 72 6c c8 50-7c d7 aa b8 58 28 7c 7d   -.Zfrl.P|...X(|}
    00a0 - 4c 64 1a 85                                       Ld..

    Start Time: 1459659110
    Timeout   : 300 (sec)
    Verify return code: 20 (unable to get local issuer certificate)
---

为什么Chromium和Firefox能够获得正确的证书，而Elinks不能？是否有办法在Elinks中阅读这些网站？

- Eric

Answer 1

您需要使用服务器名称指示（SNI）才能成功访问www.rust-lang.org。使用openssl s_client，可以通过添加-servername参数来实现此目的：

$ openssl s_client -connect www.rust-lang.org:443 \
   -servername www.rust-lang.org
...
subject=/OU=Domain Control Validated/OU=EssentialSSL Wildcard/CN=*.rust-lang.org
issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
...
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES128-GCM-SHA256

所有现代浏览器都支持SNI，并且它在互联网上被广泛使用。例如，Cloudflare免费SSL需要SNI。我猜测你所使用的elinks版本还不支持SNI。我找到了一个相关的错误报告related bug report，它是在09/2015针对elinks 0.12pre6发布的。考虑到该版本仍然是最新版本，并且 elinks开发已于2012年停止, 我猜测该问题仍未解决。

- Steffen Ullrich

---

请注意：尽管最新版本的发布日期为2012年，但“elinks”的开发并未停止，在elinksGIT存储库中有几个近年的提交。 - njsg

Answer 2

最新的Elinks git版本似乎解决了所有这些问题。

- Reinaert Albrecht