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feature(DOCKERFILE): set up nginx to run as non-root

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- add libcap
- use setcap (via libcap) to allow nginx to bind to ports <1024
- set permissions on nginx directories
- change nginx pid location to /etc/nginx
This commit is contained in:
Asif Bacchus 2021-01-07 10:06:17 -07:00
parent 53ea4c9dc1
commit 715ae9cd38
2 changed files with 15 additions and 12 deletions
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20
build/Dockerfile
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@ -1,6 +1,6 @@
FROM nginx:mainline-alpine
# default username and uid for nginx user
# default uid for nginx user
ARG UID=8001
# create nginx user
@ -14,8 +14,10 @@ RUN addgroup --gid ${UID} www-docker \
--uid ${UID} \
www-docker
# add nano, fun error pages & LetsEncrypt challenge directory outside webroot
RUN cd /usr/share/nginx \
# add libcap, allow nginx to bind to ports <1024, extract fun error pages & create LetsEncrypt challenge directory outside webroot
RUN apk --no-cache add libcap \
&& setcap 'cap_net_bind_service=+ep' /usr/sbin/nginx \
&& cd /usr/share/nginx \
&& rm -rf html/* \
&& wget -O /tmp/errorpages.tar.gz https://git.asifbacchus.app/asif/fun-errorpages/archive/v1.0.tar.gz \
&& tar -xzf /tmp/errorpages.tar.gz -C /tmp \
@ -47,12 +49,14 @@ COPY webroot /usr/share/nginx/html/
EXPOSE 80 443
# clean-up permissions and run as www-docker user
RUN chown -R www-docker:www-docker /usr/share/nginx/html \
&& find /usr/share/nginx/html -type d -exec chmod 775 {} \; \
&& find /usr/share/nginx/html -type f -exec chmod 664 {} \; \
RUN chown -R www-docker:www-docker /usr/share/nginx \
&& find /usr/share/nginx -type d -exec chmod 755 {} \; \
&& find /usr/share/nginx -type f -exec chmod 644 {} \; \
&& chown -R www-docker:www-docker /etc/nginx \
&& find /etc/nginx -type d -exec chmod 770 {} \; \
&& find /etc/nginx -type f -exec chmod 660 {} \;
&& find /etc/nginx -type d -exec chmod 750 {} \; \
&& find /etc/nginx -type f -exec chmod 640 {} \;
&& chown www-docker:www-docker /var/cache/nginx \
&& chown www-docker:www-docker /var/log/nginx
USER www-docker
# default environment variables

7
build/config/nginx.conf
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@ -2,9 +2,8 @@
### NGINX main configuration
#
user www-docker;
worker_processes 1;
pid /var/run/nginx.pid;
pid /etc/nginx/nginx.pid;
error_log /var/log/nginx/error.log warn;
@ -12,13 +11,13 @@ error_log /var/log/nginx/error.log warn;
include /etc/nginx/modules/*.conf;
events {
worker_connections 512;
worker_connections 1024;
multi_accept off;
use epoll;
}
http {
server_names_hash_bucket_size 512;
server_names_hash_bucket_size 128;
default_type application/octet-stream;
charset utf-8;
include /etc/nginx/mime.types;