Hi,
Here is a simple tip to check ssl certificate with openssl. Sometimes you can't do otherwise if the website is requesting client cert and you don't have, but you have to renew the certificate on server side...
With this command you will be able to see if the new server certificate is correct and up to date.
Here is a simple tip to check ssl certificate with openssl. Sometimes you can't do otherwise if the website is requesting client cert and you don't have, but you have to renew the certificate on server side...
With this command you will be able to see if the new server certificate is correct and up to date.
- openssl s_client -connect will connect to the website.
- 2>&1 will display the all the output.
- < /dev/null will send empty block to the command (to exit)
- then sed command will remove the BEGIN and END lines
- then openssl x509 -noout -text will print the certificat as text
root@servername # openssl s_client -connect www.google.com:443 2>&1 < /dev/null | sed -n
'/-----BEGIN/,/-----END/p' | openssl x509 -noout -text
Certificate:
Data:
Version: 3 (0x2)
Serial
Number:
81:14:a8:04:f4:b6:a5:a4:02:00:00:00:00:5f:97:72
Signature
Algorithm: sha256WithRSAEncryption
Issuer: C=US, O=Google Trust Services, CN=GTS CA 1O1
Validity
Not Before: Mar 24 06:35:44 2020 GMT
Not After : Jun 16 06:35:44 2020 GMT
Subject: C=US, ST=California, L=Mountain View, O=Google LLC,
CN=www.google.com
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:a3:b1:f2:78:b3:39:98:28:49:46:f2:c3:54:1b:
89:c1:70:2d:43:0c:1f:d2:64:96:97:1a:d3:2b:fb:
4a:a1:56:87:40:aa:c7:c7:bc:e9:1b:28:08:ae:b6:
25:02:e0:c5:61:14:86:32:6b:17:9d:67:81:79:a8:
4e:a5:0e:32:0f:50:be:5d:c8:f6:0c:4c:37:b1:e7:
6c:7d:4e:f4:97:86:99:2e:88:3c:ad:d4:b7:ec:1b:
92:33:d7:58:8d:8c:00:b7:66:99:f0:f3:ee:bb:8a:
7c:f2:da:22:87:bb:5f:e1:c0:57:b8:3e:7d:73:45:
27:cc:05:28:2f:95:ef:98:ac:cc:5d:a7:80:85:04:
71:d8:8b:d9:0a:4e:c2:3b:75:b6:e8:65:e7:de:ba:
d2:35:03:61:54:4f:55:6b:e4:7e:ca:89:cd:e0:7d:
b4:18:e2:85:8e:11:d8:8e:d9:08:7c:e5:62:a2:8f:
38:76:b5:5b:ad:24:63:4e:3d:ab:3f:04:b4:cc:ea:
c1:fa:cb:55:5a:f8:bb:9a:0d:2f:6a:19:b0:a1:a5:
8b:a9:e3:a7:f8:87:0e:90:8f:e5:68:23:32:ca:d1:
71:cc:eb:98:6c:1a:3c:06:fd:1f:c6:60:49:a7:52:
90:90:c8:59:5b:5a:d7:d7:1e:07:cf:20:ee:c7:f5:
58:77
Exponent: 65537 (0x10001)
X509v3
extensions:
X509v3
Key Usage: critical
Digital Signature, Key Encipherment
X509v3 Extended Key Usage:
TLS Web Server Authentication
X509v3 Basic Constraints: critical
CA:FALSE
X509v3 Subject Key Identifier:
E1:8A:BF:37:55:F5:37:C1:A0:4A:B6:BE:3F:F1:9C:8A:38:54:D3:6B
X509v3 Authority Key Identifier:
keyid:98:D1:F8:6E:10:EB:CF:9B:EC:60:9F:18:90:1B:A0:EB:7D:09:FD:2B
Authority Information Access:
OCSP - URI:http://ocsp.pki.goog/gts1o1
CA Issuers - URI:http://pki.goog/gsr2/GTS1O1.crt
X509v3 Subject Alternative Name:
DNS:www.google.com
X509v3
Certificate Policies:
Policy: 2.23.140.1.2.2
Policy: 1.3.6.1.4.1.11129.2.5.3
X509v3 CRL Distribution Points:
Full Name:
URI:http://crl.pki.goog/GTS1O1.crl
1.3.6.1.4.1.11129.2.4.2:
......w......... N.f.+..%
gk..p..IS-...^...q.w.......H0F.!...h-..@Y8Z.zY\...qyl..+...
.M.wB.!..&.l.....r...Z.1..L.....)Qw.G..5.u.^.s..V...6H}.I.2z.........u..qEX...q.w.......F0D.
a..........I..C..n..A...#..
}.yQ. ...E.; ....p..]&@.....>....Y..u.
Signature
Algorithm: sha256WithRSAEncryption
52:6e:de:a5:0e:32:d8:3a:5f:be:3a:27:b0:69:43:ef:22:05:
57:bc:0e:0f:99:6e:71:89:33:8c:b0:7e:e3:73:dd:19:b2:65:
85:a7:4a:4d:f2:2b:27:5d:05:61:b5:b4:86:70:37:15:e3:cd:
48:5a:11:77:d9:a5:9b:44:96:50:5e:02:69:d3:8c:aa:cd:38:
8e:40:84:a7:91:29:46:81:d6:75:a0:1b:69:31:8f:61:ec:6b:
b6:f2:23:15:5f:61:96:12:b3:31:34:06:9d:a8:67:7b:60:e6:
5f:2c:2f:6a:3d:18:9d:6c:80:c7:94:af:68:9a:6b:1e:b6:2c:
3b:f2:a9:2b:72:e8:57:4e:c8:68:ed:c6:88:2b:83:24:de:60:
07:c4:61:c7:e0:0e:a2:f6:92:8c:09:9d:1d:2c:bd:35:8d:51:
92:43:1f:5e:8f:26:9e:6f:3e:65:ff:a5:79:6f:1a:1c:b6:3c:
c8:48:85:38:a8:1b:ea:64:35:bf:df:42:0c:4e:c8:65:da:ce:
8e:c3:7f:e5:8f:fc:53:ac:32:7d:4a:90:c3:5d:c0:85:5c:84:
b3:f3:0c:0b:dc:1c:45:f5:a6:a7:ea:9e:09:e1:28:d8:d7:9e:
e3:6b:9b:85:92:dc:5e:c5:04:7b:8a:d8:c0:60:13:c1:a0:df:
1b:96:b0:13
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