This is a text-only version of the following page on https://raymii.org:

This is a text-only version of the following page on https://raymii.org:
---
Title : OpenSSL: Get all certificates from a website in plain text
Author : Remy van Elst
Date : 04-02-2014
URL : https://raymii.org/s/articles/OpenSSL_-_Get_all_certificates_from_a_website_in_plain_text.html
Format : Markdown/HTML
---

This snippet shows you how to get all certificates of a website in plain text.
With a few OpenSSL commands one can get the website certificate plus
intermediate certificates, however, if you feed that output to OpenSSL it only
works on the first certificate. Using a bit of sed and bash magic we can feed
all certificates one by one to OpenSSL.

 Recently I removed all Google Ads from this site due to their invasive tracking, as well as Google Analytics. Please, if you found this content useful, consider a small donation using any of the options below: <a href="https://leafnode.nl">I'm developing an open source monitoring app called Leaf Node Monitoring, for windows, linux & android. Go check it out!</a> <a href="https://github.com/sponsors/RaymiiOrg/">Consider sponsoring me on Github. It means the world to me if you show your appreciation and you'll help pay the server costs.</a> <a href="https://www.digitalocean.com/?refcode=7435ae6b8212">You can also sponsor me by getting a Digital Ocean VPS. With this referral link you'll get $100 credit for 60 days. </a> 

### Website certificate

You can request a website's certificate using `openssl s_client`. To view the
public key from google.com we can use the following command:

openssl s_client -connect google.com:443 </dev/null

It will output a bunch of text, including the certificate, protocol and
connection information and a part of the chain. If we just want the certificate
we can use the following command:

openssl s_client -connect google.com:443 2>&1 < /dev/null | sed -n '/-----BEGIN/,/-----END/p'

This will output only the public key.

### Plain text

If we feed that output into openssl again, we can output the certificate
information in plain text:

openssl s_client -connect google.com:443 2>&1 < /dev/null | sed -n '/-----BEGIN/,/-----END/p' | openssl x509 -noout -text

This is all the information about a certificate:

Certificate:
Data:
Version: 3 (0x2)
Serial Number:
66:79:66:fc:e2:c7:d0:2d
Signature Algorithm: sha1WithRSAEncryption
Issuer: C=US, O=Google Inc, CN=Google Internet Authority G2
Validity
Not Before: Jan 15 14:34:20 2014 GMT
Not After : May 15 00:00:00 2014 GMT
Subject: C=US, ST=California, L=Mountain View, O=Google Inc, CN=*.google.com
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:a3:cb:4e:db:d1:59:dc:13:b2:89:1d:d0:31:2c:
fb:f2:b2:55:a8:76:3c:d3:2b:00:f8:87:e6:b0:80:
af:8f:46:ed:d8:35:72:1e:d0:55:26:a4:09:7e:71:
b4:6b:28:df:c4:54:b3:17:5f:31:77:d1:a2:eb:2a:
f4:e5:7c:5e:7c:2a:3d:39:b3:56:64:bf:65:45:86:
ef:e1:b4:94:7b:df:6e:b9:e9:c7:ef:b0:12:b8:31:
54:58:a9:39:bd:33:8f:df:53:76:da:49:ae:bf:5e:
f3:e7:f3:2f:6a:e5:9e:d9:fd:58:99:45:f7:a0:6f:
23:6e:88:8f:1d:3e:c3:50:28:a1:d6:ba:a6:56:50:
f4:c0:a9:73:37:96:75:42:5b:2f:65:18:54:17:fa:
51:f7:74:f2:59:18:dc:e4:33:fb:88:d5:60:e4:7e:
f7:65:57:02:fd:8d:f6:e3:74:53:c5:27:30:ec:85:
b0:db:43:f0:1f:af:e5:c1:f5:c7:06:8b:11:a8:20:
50:df:98:72:b7:4b:0f:73:e7:d9:7a:b8:3d:51:e7:
bc:d2:0f:12:27:d0:e2:f6:2e:0a:a9:c1:78:df:d6:
d1:5f:59:9f:a2:44:ef:7c:24:ca:b9:f8:7e:fe:c2:
84:66:f7:f8:9d:41:19:42:61:90:52:5c:68:33:b8:
b6:61
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Extended Key Usage:
TLS Web Server Authentication, TLS Web Client Authentication
X509v3 Subject Alternative Name:
DNS:*.google.com, DNS:*.android.com, DNS:*.appengine.google.com, DNS:*.cloud.google.com, DNS:*.google-analytics.com, DNS:*.google.ca, DNS:*.google.cl, DNS:*.google.co.in, DNS:*.google.co.jp, DNS:*.google.co.uk, DNS:*.google.com.ar, DNS:*.google.com.au, DNS:*.google.com.br, DNS:*.google.com.co, DNS:*.google.com.mx, DNS:*.google.com.tr, DNS:*.google.com.vn, DNS:*.google.de, DNS:*.google.es, DNS:*.google.fr, DNS:*.google.hu, DNS:*.google.it, DNS:*.google.nl, DNS:*.google.pl, DNS:*.google.pt, DNS:*.googleapis.cn, DNS:*.googlecommerce.com, DNS:*.googlevideo.com, DNS:*.gstatic.com, DNS:*.urchin.com, DNS:*.url.google.com, DNS:*.youtube-nocookie.com, DNS:*.youtube.com, DNS:*.youtubeeducation.com, DNS:*.ytimg.com, DNS:android.com, DNS:g.co, DNS:goo.gl, DNS:google-analytics.com, DNS:google.com, DNS:googlecommerce.com, DNS:urchin.com, DNS:youtu.be, DNS:youtube.com, DNS:youtubeeducation.com
Authority Information Access:
CA Issuers - URI:http://pki.google.com/GIAG2.crt
OCSP - URI:http://clients1.google.com/ocsp

X509v3 Subject Key Identifier:
61:54:7B:A4:44:E8:68:E2:D3:0D:CC:77:D4:29:35:3B:58:23:60:B3
X509v3 Basic Constraints: critical
CA:FALSE
X509v3 Authority Key Identifier:
keyid:4A:DD:06:16:1B:BC:F6:68:B5:76:F5:81:B6:BB:62:1A:BA:5A:81:2F

X509v3 Certificate Policies:
Policy: 1.3.6.1.4.1.11129.2.5.1

X509v3 CRL Distribution Points:

Full Name:
URI:http://pki.google.com/GIAG2.crl

Signature Algorithm: sha1WithRSAEncryption
6f:7b:07:5c:59:ce:7d:52:b3:bc:26:c7:7c:e8:6e:32:aa:fc:
3e:67:0a:51:1c:4b:6e:bb:7d:69:eb:fc:7a:02:76:59:bf:86:
97:50:ed:bd:ec:88:7c:d3:a0:a3:a6:27:fe:a0:21:55:76:da:
1b:7c:22:82:1e:31:73:d3:25:33:2d:72:de:63:36:18:50:9e:
49:bf:e3:78:c7:b4:33:38:b7:f8:10:93:a0:fa:5d:a7:4d:78:
48:74:7f:dd:c6:aa:8f:eb:26:de:e3:6b:4f:4b:c7:3a:0c:b7:
4c:c3:a9:bf:2b:46:b8:50:37:0b:05:e5:92:e4:9c:f3:36:bb:
f1:75:ad:20:31:99:1e:3d:83:6e:e1:dd:13:67:1a:2a:f7:c6:
e1:1d:4d:c4:4f:f8:e0:88:c5:3e:17:8b:15:5e:71:3d:69:99:
56:ba:fb:7f:07:d6:33:0a:d0:27:aa:9d:ce:77:a9:af:a1:93:
10:8c:27:48:1a:1f:62:48:04:8f:64:51:6d:52:e9:60:6d:a9:
98:7b:43:d6:cc:66:69:65:40:d6:57:ff:06:f5:73:59:8f:1b:
87:9b:36:5b:41:06:4a:5e:25:69:bb:f0:70:49:72:0b:d8:67:
7b:ed:d4:b3:c8:79:c8:58:5e:f3:f1:f5:98:fa:80:03:d3:7d:
8a:d0:c8:76

### Multiple certificates

Using the `-showcerts` option of `s_client` we can show all certificates the
website sends, including the issuing and intermediate certificates:

openssl s_client -connect google.com:443 -showcerts 2>&1 < /dev/null

If we want to receive those certificates without all the other output we can use
the same sed trick as before:

openssl s_client -connect google.com:443 -showcerts 2>&1 < /dev/null | sed -n '/-----BEGIN/,/-----END/p'

However, if we feed that into openssl again to receive the plain text output we
only get output for the first certificate:

openssl s_client -connect google.com:443 -showcerts 2>&1 < /dev/null | sed -n '/-----BEGIN/,/-----END/p' | openssl x509 -noout -text

According to the OpenSSL documentation the x509 option only supports one
certificate at a time. Using the following one liner we:

* Set the Internal Field Separator to a colon `(:)`.
* Get all the certificates for google.com in a variable named `certificates`.
* We use a group of sed commands to first print the certificates, then we substitute the beginning of the `-----BEGIN` line with a colon `(:)` and then the original `----BEGIN` line resulting in `:-----BEGIN`.
* We do a for loop on all certificates in the output, split by a colon `(:)`.
* We feed those one by one to OpenSSL
* We change the Internal Field Seperator back to what it was.

This is the command:

OLDIFS=$IFS; IFS=':' certificates=$(openssl s_client -connect google.com:443
-showcerts -tlsextdebug 2>&1 </dev/null | sed -n '/-----BEGIN/,/-----END/
{/-----BEGIN/ s/^/:/; p}'); for certificate in ${certificates#:}; do echo
$certificate | openssl x509 -noout -text; done; IFS=$OLDIFS

Do note that you need the GNU version of `sed`. The OS X or BSD version will not
work.

The output are all certificates in text format:

Certificate:
Data:
Version: 3 (0x2)
Serial Number:
66:79:66:fc:e2:c7:d0:2d
Signature Algorithm: sha1WithRSAEncryption
Issuer: C=US, O=Google Inc, CN=Google Internet Authority G2
Validity
Not Before: Jan 15 14:34:20 2014 GMT
Not After : May 15 00:00:00 2014 GMT
Subject: C=US, ST=California, L=Mountain View, O=Google Inc, CN=*.google.com
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:a3:cb:4e:db:d1:59:dc:13:b2:89:1d:d0:31:2c:
fb:f2:b2:55:a8:76:3c:d3:2b:00:f8:87:e6:b0:80:
af:8f:46:ed:d8:35:72:1e:d0:55:26:a4:09:7e:71:
b4:6b:28:df:c4:54:b3:17:5f:31:77:d1:a2:eb:2a:
f4:e5:7c:5e:7c:2a:3d:39:b3:56:64:bf:65:45:86:
ef:e1:b4:94:7b:df:6e:b9:e9:c7:ef:b0:12:b8:31:
54:58:a9:39:bd:33:8f:df:53:76:da:49:ae:bf:5e:
f3:e7:f3:2f:6a:e5:9e:d9:fd:58:99:45:f7:a0:6f:
23:6e:88:8f:1d:3e:c3:50:28:a1:d6:ba:a6:56:50:
f4:c0:a9:73:37:96:75:42:5b:2f:65:18:54:17:fa:
51:f7:74:f2:59:18:dc:e4:33:fb:88:d5:60:e4:7e:
f7:65:57:02:fd:8d:f6:e3:74:53:c5:27:30:ec:85:
b0:db:43:f0:1f:af:e5:c1:f5:c7:06:8b:11:a8:20:
50:df:98:72:b7:4b:0f:73:e7:d9:7a:b8:3d:51:e7:
bc:d2:0f:12:27:d0:e2:f6:2e:0a:a9:c1:78:df:d6:
d1:5f:59:9f:a2:44:ef:7c:24:ca:b9:f8:7e:fe:c2:
84:66:f7:f8:9d:41:19:42:61:90:52:5c:68:33:b8:
b6:61
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Extended Key Usage:
TLS Web Server Authentication, TLS Web Client Authentication
X509v3 Subject Alternative Name:
DNS:*.google.com, DNS:*.android.com, DNS:*.appengine.google.com, DNS:*.cloud.google.com, DNS:*.google-analytics.com, DNS:*.google.ca, DNS:*.google.cl, DNS:*.google.co.in, DNS:*.google.co.jp, DNS:*.google.co.uk, DNS:*.google.com.ar, DNS:*.google.com.au, DNS:*.google.com.br, DNS:*.google.com.co, DNS:*.google.com.mx, DNS:*.google.com.tr, DNS:*.google.com.vn, DNS:*.google.de, DNS:*.google.es, DNS:*.google.fr, DNS:*.google.hu, DNS:*.google.it, DNS:*.google.nl, DNS:*.google.pl, DNS:*.google.pt, DNS:*.googleapis.cn, DNS:*.googlecommerce.com, DNS:*.googlevideo.com, DNS:*.gstatic.com, DNS:*.urchin.com, DNS:*.url.google.com, DNS:*.youtube-nocookie.com, DNS:*.youtube.com, DNS:*.youtubeeducation.com, DNS:*.ytimg.com, DNS:android.com, DNS:g.co, DNS:goo.gl, DNS:google-analytics.com, DNS:google.com, DNS:googlecommerce.com, DNS:urchin.com, DNS:youtu.be, DNS:youtube.com, DNS:youtubeeducation.com
Authority Information Access:
CA Issuers - URI:http://pki.google.com/GIAG2.crt
OCSP - URI:http://clients1.google.com/ocsp

X509v3 Subject Key Identifier:
61:54:7B:A4:44:E8:68:E2:D3:0D:CC:77:D4:29:35:3B:58:23:60:B3
X509v3 Basic Constraints: critical
CA:FALSE
X509v3 Authority Key Identifier:
keyid:4A:DD:06:16:1B:BC:F6:68:B5:76:F5:81:B6:BB:62:1A:BA:5A:81:2F

X509v3 Certificate Policies:
Policy: 1.3.6.1.4.1.11129.2.5.1

X509v3 CRL Distribution Points:

Full Name:
URI:http://pki.google.com/GIAG2.crl

Signature Algorithm: sha1WithRSAEncryption
6f:7b:07:5c:59:ce:7d:52:b3:bc:26:c7:7c:e8:6e:32:aa:fc:
3e:67:0a:51:1c:4b:6e:bb:7d:69:eb:fc:7a:02:76:59:bf:86:
97:50:ed:bd:ec:88:7c:d3:a0:a3:a6:27:fe:a0:21:55:76:da:
1b:7c:22:82:1e:31:73:d3:25:33:2d:72:de:63:36:18:50:9e:
49:bf:e3:78:c7:b4:33:38:b7:f8:10:93:a0:fa:5d:a7:4d:78:
48:74:7f:dd:c6:aa:8f:eb:26:de:e3:6b:4f:4b:c7:3a:0c:b7:
4c:c3:a9:bf:2b:46:b8:50:37:0b:05:e5:92:e4:9c:f3:36:bb:
f1:75:ad:20:31:99:1e:3d:83:6e:e1:dd:13:67:1a:2a:f7:c6:
e1:1d:4d:c4:4f:f8:e0:88:c5:3e:17:8b:15:5e:71:3d:69:99:
56:ba:fb:7f:07:d6:33:0a:d0:27:aa:9d:ce:77:a9:af:a1:93:
10:8c:27:48:1a:1f:62:48:04:8f:64:51:6d:52:e9:60:6d:a9:
98:7b:43:d6:cc:66:69:65:40:d6:57:ff:06:f5:73:59:8f:1b:
87:9b:36:5b:41:06:4a:5e:25:69:bb:f0:70:49:72:0b:d8:67:
7b:ed:d4:b3:c8:79:c8:58:5e:f3:f1:f5:98:fa:80:03:d3:7d:
8a:d0:c8:76
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 146025 (0x23a69)
Signature Algorithm: sha1WithRSAEncryption
Issuer: C=US, O=GeoTrust Inc., CN=GeoTrust Global CA
Validity
Not Before: Apr 5 15:15:55 2013 GMT
Not After : Apr 4 15:15:55 2015 GMT
Subject: C=US, O=Google Inc, CN=Google Internet Authority G2
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:9c:2a:04:77:5c:d8:50:91:3a:06:a3:82:e0:d8:
50:48:bc:89:3f:f1:19:70:1a:88:46:7e:e0:8f:c5:
f1:89:ce:21:ee:5a:fe:61:0d:b7:32:44:89:a0:74:
0b:53:4f:55:a4:ce:82:62:95:ee:eb:59:5f:c6:e1:
05:80:12:c4:5e:94:3f:bc:5b:48:38:f4:53:f7:24:
e6:fb:91:e9:15:c4:cf:f4:53:0d:f4:4a:fc:9f:54:
de:7d:be:a0:6b:6f:87:c0:d0:50:1f:28:30:03:40:
da:08:73:51:6c:7f:ff:3a:3c:a7:37:06:8e:bd:4b:
11:04:eb:7d:24:de:e6:f9:fc:31:71:fb:94:d5:60:
f3:2e:4a:af:42:d2:cb:ea:c4:6a:1a:b2:cc:53:dd:
15:4b:8b:1f:c8:19:61:1f:cd:9d:a8:3e:63:2b:84:
35:69:65:84:c8:19:c5:46:22:f8:53:95:be:e3:80:
4a:10:c6:2a:ec:ba:97:20:11:c7:39:99:10:04:a0:
f0:61:7a:95:25:8c:4e:52:75:e2:b6:ed:08:ca:14:
fc:ce:22:6a:b3:4e:cf:46:03:97:97:03:7e:c0:b1:
de:7b:af:45:33:cf:ba:3e:71:b7:de:f4:25:25:c2:
0d:35:89:9d:9d:fb:0e:11:79:89:1e:37:c5:af:8e:
72:69
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Authority Key Identifier:
keyid:C0:7A:98:68:8D:89:FB:AB:05:64:0C:11:7D:AA:7D:65:B8:CA:CC:4E

X509v3 Subject Key Identifier:
4A:DD:06:16:1B:BC:F6:68:B5:76:F5:81:B6:BB:62:1A:BA:5A:81:2F
X509v3 Basic Constraints: critical
CA:TRUE, pathlen:0
X509v3 Key Usage: critical
Certificate Sign, CRL Sign
X509v3 CRL Distribution Points:

Full Name:
URI:http://crl.geotrust.com/crls/gtglobal.crl

Authority Information Access:
OCSP - URI:http://gtglobal-ocsp.geotrust.com

X509v3 Certificate Policies:
Policy: 1.3.6.1.4.1.11129.2.5.1

Signature Algorithm: sha1WithRSAEncryption
36:d7:06:80:11:27:ad:2a:14:9b:38:77:b3:23:a0:75:58:bb:
b1:7e:83:42:ba:72:da:1e:d8:8e:36:06:97:e0:f0:95:3b:37:
fd:1b:42:58:fe:22:c8:6b:bd:38:5e:d1:3b:25:6e:12:eb:5e:
67:76:46:40:90:da:14:c8:78:0d:ed:95:66:da:8e:86:6f:80:
a1:ba:56:32:95:86:dc:dc:6a:ca:04:8c:5b:7f:f6:bf:cc:6f:
85:03:58:c3:68:51:13:cd:fd:c8:f7:79:3d:99:35:f0:56:a3:
bd:e0:59:ed:4f:44:09:a3:9e:38:7a:f6:46:d1:1d:12:9d:4f:
be:d0:40:fc:55:fe:06:5e:3c:da:1c:56:bd:96:51:7b:6f:57:
2a:db:a2:aa:96:dc:8c:74:c2:95:be:f0:6e:95:13:ff:17:f0:
3c:ac:b2:10:8d:cc:73:fb:e8:8f:02:c6:f0:fb:33:b3:95:3b:
e3:c2:cb:68:58:73:db:a8:24:62:3b:06:35:9d:0d:a9:33:bd:
78:03:90:2e:4c:78:5d:50:3a:81:d4:ee:a0:c8:70:38:dc:b2:
f9:67:fa:87:40:5d:61:c0:51:8f:6b:83:6b:cd:05:3a:ca:e1:
a7:05:78:fc:ca:da:94:d0:2c:08:3d:7e:16:79:c8:a0:50:20:
24:54:33:71
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 1227750 (0x12bbe6)
Signature Algorithm: sha1WithRSAEncryption
Issuer: C=US, O=Equifax, OU=Equifax Secure Certificate Authority
Validity
Not Before: May 21 04:00:00 2002 GMT
Not After : Aug 21 04:00:00 2018 GMT
Subject: C=US, O=GeoTrust Inc., CN=GeoTrust Global CA
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:da:cc:18:63:30:fd:f4:17:23:1a:56:7e:5b:df:
3c:6c:38:e4:71:b7:78:91:d4:bc:a1:d8:4c:f8:a8:
43:b6:03:e9:4d:21:07:08:88:da:58:2f:66:39:29:
bd:05:78:8b:9d:38:e8:05:b7:6a:7e:71:a4:e6:c4:
60:a6:b0:ef:80:e4:89:28:0f:9e:25:d6:ed:83:f3:
ad:a6:91:c7:98:c9:42:18:35:14:9d:ad:98:46:92:
2e:4f:ca:f1:87:43:c1:16:95:57:2d:50:ef:89:2d:
80:7a:57:ad:f2:ee:5f:6b:d2:00:8d:b9:14:f8:14:
15:35:d9:c0:46:a3:7b:72:c8:91:bf:c9:55:2b:cd:
d0:97:3e:9c:26:64:cc:df:ce:83:19:71:ca:4e:e6:
d4:d5:7b:a9:19:cd:55:de:c8:ec:d2:5e:38:53:e5:
5c:4f:8c:2d:fe:50:23:36:fc:66:e6:cb:8e:a4:39:
19:00:b7:95:02:39:91:0b:0e:fe:38:2e:d1:1d:05:
9a:f6:4d:3e:6f:0f:07:1d:af:2c:1e:8f:60:39:e2:
fa:36:53:13:39:d4:5e:26:2b:db:3d:a8:14:bd:32:
eb:18:03:28:52:04:71:e5:ab:33:3d:e1:38:bb:07:
36:84:62:9c:79:ea:16:30:f4:5f:c0:2b:e8:71:6b:
e4:f9
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Authority Key Identifier:
keyid:48:E6:68:F9:2B:D2:B2:95:D7:47:D8:23:20:10:4F:33:98:90:9F:D4

X509v3 Subject Key Identifier:
C0:7A:98:68:8D:89:FB:AB:05:64:0C:11:7D:AA:7D:65:B8:CA:CC:4E
X509v3 Basic Constraints: critical
CA:TRUE
X509v3 Key Usage: critical
Certificate Sign, CRL Sign
X509v3 CRL Distribution Points:

Full Name:
URI:http://crl.geotrust.com/crls/secureca.crl

X509v3 Certificate Policies:
Policy: X509v3 Any Policy
CPS: https://www.geotrust.com/resources/repository

Signature Algorithm: sha1WithRSAEncryption
76:e1:12:6e:4e:4b:16:12:86:30:06:b2:81:08:cf:f0:08:c7:
c7:71:7e:66:ee:c2:ed:d4:3b:1f:ff:f0:f0:c8:4e:d6:43:38:
b0:b9:30:7d:18:d0:55:83:a2:6a:cb:36:11:9c:e8:48:66:a3:
6d:7f:b8:13:d4:47:fe:8b:5a:5c:73:fc:ae:d9:1b:32:19:38:
ab:97:34:14:aa:96:d2:eb:a3:1c:14:08:49:b6:bb:e5:91:ef:
83:36:eb:1d:56:6f:ca:da:bc:73:63:90:e4:7f:7b:3e:22:cb:
3d:07:ed:5f:38:74:9c:e3:03:50:4e:a1:af:98:ee:61:f2:84:
3f:12

### Other certificate information

You can also retrieve for example the OCSP URL of all certificates:

OLDIFS=$IFS; IFS=':' certificates=$(openssl s_client -connect google.com:443 -showcerts -tlsextdebug 2>&1 </dev/null | sed -n '/-----BEGIN/,/-----END/ {/-----BEGIN/ s/^/:/; p}'); for certificate in ${certificates#:}; do echo $certificate | openssl x509 -noout -ocsp_uri; done; IFS=$OLDIFS

Output:

http://clients1.google.com/ocsp
http://gtglobal-ocsp.geotrust.com

Serial Numbers:

OLDIFS=$IFS; IFS=':' certificates=$(openssl s_client -connect google.com:443 -showcerts -tlsextdebug 2>&1 </dev/null | sed -n '/-----BEGIN/,/-----END/ {/-----BEGIN/ s/^/:/; p}'); for certificate in ${certificates#:}; do echo $certificate | openssl x509 -noout -serial; done; IFS=$OLDIFS

Output:

serial=667966FCE2C7D02D
serial=023A69
serial=12BBE6

The subject in the certificates:

OLDIFS=$IFS; IFS=':' certificates=$(openssl s_client -connect google.com:443 -showcerts -tlsextdebug 2>&1 </dev/null | sed -n '/-----BEGIN/,/-----END/ {/-----BEGIN/ s/^/:/; p}'); for certificate in ${certificates#:}; do echo $certificate | openssl x509 -noout -subject; done; IFS=$OLDIFS

Output:

subject= /C=US/ST=California/L=Mountain View/O=Google Inc/CN=*.google.com
subject= /C=US/O=Google Inc/CN=Google Internet Authority G2
subject= /C=US/O=GeoTrust Inc./CN=GeoTrust Global CA

All the fingerprints:

OLDIFS=$IFS; IFS=':' certificates=$(openssl s_client -connect google.com:443 -showcerts -tlsextdebug 2>&1 </dev/null | sed -n '/-----BEGIN/,/-----END/ {/-----BEGIN/ s/^/:/; p}'); for certificate in ${certificates#:}; do echo $certificate | openssl x509 -noout -subject; echo $certificate | openssl x509 -noout -fingerprint; done; IFS=$OLDIFS

Output:

subject= /C=US/ST=California/L=Mountain View/O=Google Inc/CN=*.google.com
SHA1 Fingerprint=99:00:2C:A4:91:BC:53:D7:53:75:B1:8B:F9:24:55:26:4B:69:A4:34
subject= /C=US/O=Google Inc/CN=Google Internet Authority G2
SHA1 Fingerprint=D8:3C:1A:7F:4D:04:46:BB:20:81:B8:1A:16:70:F8:18:34:51:CA:24
subject= /C=US/O=GeoTrust Inc./CN=GeoTrust Global CA
SHA1 Fingerprint=73:59:75:5C:6D:F9:A0:AB:C3:06:0B:CE:36:95:64:C8:EC:45:42:A3

### Sources

[Documentation for openssl x509][2]

[1]: https://www.digitalocean.com/?refcode=7435ae6b8212
[2]: http://www.openssl.org/docs/apps/x509.html

---

License:
All the text on this website is free as in freedom unless stated otherwise.
This means you can use it in any way you want, you can copy it, change it
the way you like and republish it, as long as you release the (modified)
content under the same license to give others the same freedoms you've got
and place my name and a link to this site with the article as source.

This site uses Google Analytics for statistics and Google Adwords for
advertisements. You are tracked and Google knows everything about you.
Use an adblocker like ublock-origin if you don't want it.

All the code on this website is licensed under the GNU GPL v3 license
unless already licensed under a license which does not allows this form
of licensing or if another license is stated on that page / in that software:

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Just to be clear, the information on this website is for meant for educational
purposes and you use it at your own risk. I do not take responsibility if you
screw something up. Use common sense, do not 'rm -rf /' as root for example.
If you have any questions then do not hesitate to contact me.

See https://raymii.org/s/static/About.html for details.