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Allow multiple alternative domain names #7

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6 changes: 6 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,12 @@ To generate a certificate for `example.dev` and its subdomains, run:
create-certificate.sh example.dev
```

To generate a certificate for `example.dev` along with one or more [alternative domains](https://en.wikipedia.org/wiki/Subject_Alternative_Name), run:

```
create-certificate.sh example.dev alternative-domain.dev alternative-domain.test
```

![create-certificate.sh](https://raw.githubusercontent.com/BenMorel/dev-certificates/main/images/create-certificate.png)

You can now install the `.key` and `.crt` files in your web server, such as Apache or Nginx.
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23 changes: 19 additions & 4 deletions create-certificate.sh
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@@ -1,19 +1,24 @@
#!/usr/bin/env bash

# Generates a wildcard certificate for a given domain name.
# Generates a wildcard certificate for a given domain name with optional alternative domain names.

set -e

if [ -z "$1" ]; then
echo -e "\e[43mMissing domain name!\e[49m"
echo
echo "Usage: $0 example.com"
echo "Usage: $0 example.dev"
echo
echo "This will generate a wildcard certificate for the given domain name and its subdomains."
echo
echo "Usage: $0 example.dev alternative-domain.dev"
echo
echo "This will generate a wildcard certificate for the given domain name, alternative domains and all subdomains for each of them."
exit
fi

DOMAIN=$1
ALT_NAME_INDEX=0

if [ ! -f "ca.key" ]; then
echo -e "\e[41mCertificate Authority private key does not exist!\e[49m"
Expand All @@ -36,10 +41,20 @@ keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
extendedKeyUsage = serverAuth, clientAuth
subjectAltName = @alt_names
[alt_names]
DNS.1 = $DOMAIN
DNS.2 = *.$DOMAIN
EOF

function add_alt_name() {
ALT_NAME_INDEX=$((ALT_NAME_INDEX + 1))
>>"$DOMAIN.ext" cat <<-EOF
DNS.$ALT_NAME_INDEX = $1
EOF
}

for domain_alt in "${@}"; do
add_alt_name $domain_alt
add_alt_name "*.$domain_alt"
done

# Create the signed certificate
openssl x509 -req \
-in "$DOMAIN.csr" \
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