mirror of
https://github.com/nginx-proxy/nginx-proxy
synced 2024-05-29 02:46:18 +02:00
004e4a5cda
- `DHPARAM_FILE` is a local var not intended for overriding via ENV. Clarified that with `local` declaration. - `FFDHE_GROUP` var uses default assignment (_`:=4096` instead of only substitute `:-4096`_), so that `DHPARAM_BITS` retains the default 4096 value in subsequent references if no custom size was provided. - Refactored the conditional statements to only handle early failure conditions. Shifting out the RFC7919 support that can run after all checks have passed. - Revised comments.
72 lines
2.4 KiB
Bash
Executable File
72 lines
2.4 KiB
Bash
Executable File
#!/bin/bash
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set -e
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function _check_unix_socket() {
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# Warn if the DOCKER_HOST socket does not exist
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if [[ ${DOCKER_HOST} == unix://* ]]; then
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local SOCKET_FILE="${DOCKER_HOST#unix://}"
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if [[ ! -S ${SOCKET_FILE} ]]; then
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cat >&2 <<-EOT
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ERROR: you need to share your Docker host socket with a volume at ${SOCKET_FILE}
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Typically you should run your nginxproxy/nginx-proxy with: \`-v /var/run/docker.sock:${SOCKET_FILE}:ro\`
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See the documentation at: https://github.com/nginx-proxy/nginx-proxy/#usage
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EOT
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exit 1
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fi
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fi
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}
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function _resolvers() {
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# Compute the DNS resolvers for use in the templates - if the IP contains ":", it's IPv6 and must be enclosed in []
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RESOLVERS=$(awk '$1 == "nameserver" {print ($2 ~ ":")? "["$2"]": $2}' ORS=' ' /etc/resolv.conf | sed 's/ *$//g'); export RESOLVERS
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SCOPED_IPV6_REGEX='\[fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}\]'
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if [[ -z ${RESOLVERS} ]]; then
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echo 'Warning: unable to determine DNS resolvers for nginx' >&2
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unset RESOLVERS
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elif [[ ${RESOLVERS} =~ ${SCOPED_IPV6_REGEX} ]]; then
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echo -n 'Warning: Scoped IPv6 addresses removed from resolvers: ' >&2
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echo "${RESOLVERS}" | grep -Eo "$SCOPED_IPV6_REGEX" | paste -s -d ' ' >&2
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RESOLVERS=$(echo "${RESOLVERS}" | sed -r "s/${SCOPED_IPV6_REGEX}//g" | xargs echo -n); export RESOLVERS
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fi
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}
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function _setup_dhparam() {
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echo 'Setting up DH Parameters..'
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# DH params will be supplied for nginx here:
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local DHPARAM_FILE='/etc/nginx/dhparam/dhparam.pem'
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# Should be 2048, 3072, or 4096 (default):
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local FFDHE_GROUP="${DHPARAM_BITS:=4096}"
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# DH params may be provided by the user (rarely necessary)
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if [[ -f ${DHPARAM_FILE} ]]; then
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echo 'Warning: A custom dhparam.pem file was provided. Best practice is to use standardized RFC7919 DHE groups instead.' >&2
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return 0
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elif [[ ! ${DHPARAM_BITS} =~ ^(2048|3072|4096)$ ]]; then
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echo "ERROR: Unsupported DHPARAM_BITS size: ${DHPARAM_BITS}. Use: 2048, 3072, or 4096 (default)." >&2
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exit 1
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fi
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# Use an existing pre-generated DH group from RFC7919 (https://datatracker.ietf.org/doc/html/rfc7919#appendix-A):
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local RFC7919_DHPARAM_FILE="/app/dhparam/ffdhe${FFDHE_GROUP}.pem"
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# Provide the DH params file to nginx:
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cp "${RFC7919_DHPARAM_FILE}" "${DHPARAM_FILE}"
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}
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# Run the init logic if the default CMD was provided
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if [[ $* == 'forego start -r' ]]; then
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_check_unix_socket
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_resolvers
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_setup_dhparam
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fi
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exec "$@"
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