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82 lines
2.3 KiB
Markdown
82 lines
2.3 KiB
Markdown
create_server_certificate.sh
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============================
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`create_server_certificate.sh` is a script helping with issuing server certificates that can be used to provide TLS on web servers.
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It also creates a Certificate Authority (CA) root key and certificate. This CA root certificate can be used to validate the server certificates it generates.
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For instance, with _curl_:
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curl --cacert /somewhere/ca-root.crt https://www.example.com/
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or with _wget_:
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wget --certificate=/somewhere/ca-root.crt https://www.example.com/
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or with the python _requests_ module:
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import requests
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r = requests.get("https://www.example.com", verify="/somewhere/ca-root.crt")
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Usage
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-----
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### Simple domain
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Create a server certificate for domain `www.example.com`:
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./create_server_certificate.sh www.example.com
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Will produce:
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- `www.example.com.key`
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- `www.example.com.crt`
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### Multiple domains
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Create a server certificate for main domain `www.example.com` and alternative domains `example.com`, `foo.com` and `bar.com`:
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./create_server_certificate.sh www.example.com foo.com bar.com
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Will produce:
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- `www.example.com.key`
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- `www.example.com.crt`
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### Wildcard domain
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Create a server certificate for wildcard domain `*.example.com`:
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./create_server_certificate.sh "*.example.com"
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Note that you need to use quotes around the domain string or the shell would expand `*`.
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Will produce:
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- `*.example.com.key`
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- `*.example.com.crt`
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Again, to prevent your shell from expanding `*`, use quotes. i.e.: `cat "*.example.com.crt"`.
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Such a server certificate would be valid for domains:
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- `foo.example.com`
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- `bar.example.com`
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but not for domains:
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- `example.com`
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- `foo.bar.example.com`
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### Wildcard domain on multiple levels
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While you can technically create a server certificate for wildcard domain `*.example.com` and alternative name `*.*.example.com`, client implementations generally do not support multiple wildcards in a domain name.
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For instance, a python script using urllib3 would fail to validate domain `foo.bar.example.com` presenting a certificate with name `*.*.example.com`. It is advised to stay away from producing such certificates.
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If you want to give it a try:
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./create_server_certificate.sh "*.example.com" "*.*.example.com"
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Such a server certificate would be valid for domains:
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- `foo.example.com`
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- `bar.example.com`
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- `foo.bar.example.com`
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