How to renew a self-signed PEMS certificate
I have a self signed certificate for an SSL web browser named shttpd.pem My problem is certificate expiration and renewal period
Validity Not before: Sep 16 03:21:22 2008 GMT Not after: September 16 03:21:22 2009 GMT
I need to renew my certificate for ten years
this is a certificate capture
openssl x509 -text -in shttpd.pem
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
86:22:84:0d:ba:09:d4:ca
Signature Algorithm: sha1WithRSAEncryption
Issuer: C=PL, ST=Some-State, O=Mini Webservice Ltd
Validity
Not Before: Sep 16 03:21:22 2008 GMT
Not After : Sep 16 03:21:22 2009 GMT
Subject: C=PL, ST=Some-State, O=Mini Webservice Ltd
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (1024 bit)
Modulus:
00:de:7e:0a:69:69:c7:06:f1:4b:3d:03:8b:45:dc:
ab:63:39:f6:44:30:9b:7c:a8:c0:ff:1c:b9:4f:29:
b1:1d:6b:ba:3d:16:7c:b1:bf:e8:67:d6:93:a4:f1:
68:b9:2c:44:e7:91:54:0c:cb:b2:ff:af:80:c3:83:
aa:84:84:a7:f9:b9:d8:1d:1a:b2:42:72:2d:2f:fe:
71:0c:4a:02:0c:35:34:12:d5:2a:bc:de:e1:a3:4f:
3c:7b:9c:12:32:56:71:ae:af:bc:76:b6:e4:55:f4:
2f:df:ff:eb:c7:43:87:b0:40:81:80:1e:1d:d3:77:
c9:66:50:ce:32:f2:f9:fa:a1
Exponent: 65537 (0x10001)
X509v3 extensions:
Netscape Cert Type:
SSL Server
Signature Algorithm: sha1WithRSAEncryption
38:9e:5e:01:95:0c:7c:5c:4a:cd:57:e5:62:ee:50:90:7a:69:
9e:4a:6f:74:f5:ad:7b:7a:63:b6:ad:94:1a:c1:ff:23:f9:8d:
01:16:6c:62:c7:2d:bd:bb:54:ac:d5:43:a1:fe:60:8f:83:6a:
20:7a:05:57:6f:54:0e:a5:bc:3a:9c:b9:e4:36:75:33:30:fd:
b3:66:7d:ff:06:01:df:bf:e6:62:a6:d8:d0:e1:ba:d5:0f:4f:
eb:df:99:27:2f:5d:63:1b:0d:15:b3:69:90:63:20:ed:ce:4b:
b4:ad:db:e8:3c:67:5f:ed:39:44:e2:4c:c3:a3:c2:92:b9:f6:
8c:a5
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
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3 answers
I am creating a bash script to address the issue of renewing a certification PEM file
#!/bin/bash
# FIXME we need shttp.pem are on same folder like execution path of script
# Extract a certificate sign request form certification file (PEM)
openssl x509 -x509toreq -in shttpd.pem -out shttpd.csr -signkey shttpd.pem
# Extract private key from certification file (PEM)
openssl rsa -in shttpd.pem -out shttpd.key
# Create new certification for ten years
openssl x509 -req -days 3650 -in shttpd.csr -out shttpd.crt.new -signkey shttpd.key
#Concatenate new certificate and old private key on a renewed pem file
cat shttpd.crt.new shttpd.key > shttpd.pem.new
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The following command generates a relatively strong (from 2016) certificate for a domain example.com
, valid for ~ 10 years ( 3650
days). It saves the private key and certificate to files example.key
and example.crt
.
openssl req -x509 -newkey rsa:4096 -sha256 -nodes -keyout example.key -out example.crt -subj "/CN=example.com" -days 3650
For more information see How to create a self-signed certificate using openssl?
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A more convenient version of the jorge dominguez script
#!/bin/sh
: '
Script used to renew self-signed certificate saved as PEM
1st arg - current PEM file
rest args - options for openssl x509 -req
new PEM is saved in same directory as old one with .new appendix
example usage: ./pemrenew.sh /tmp/keycert.pem -days 365
'
# First arg is pointed to current PEM file
pem_file="$1"
shift
# Create temporary files
tmp_csr=$(mktemp /tmp/csr.XXXXXXXXX)
tmp_key=$(mktemp /tmp/key.XXXXXXXXX)
tmp_crt=$(mktemp /tmp/crt.XXXXXXXXX)
# Extract a certificate sign request form certification file (PEM)
openssl x509 -x509toreq -in $pem_file -out $tmp_csr -signkey $pem_file
# Extract private key from certification file (PEM)
openssl rsa -in $pem_file -out $tmp_key
# Create new certificate with provided options as arguments
openssl x509 -req $@ -in $tmp_csr -out $tmp_crt -signkey $tmp_key
# Merge certificate and key to one file
cat $tmp_crt $tmp_key > $pem_file.new
# Clean temporary files
rm $tmp_csr $tmp_key $tmp_crt
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