Nginx HTTP authorization only for git push

Question

I host a private git server using Nginx. I'd like anyone to clone into my repos (without authorization) but require authorization if they try to push a commit.

My Nginx configuration is as follows:

server {
  listen 443 ssl;
  server_name git.example.com;
  ssl_certificate /fullchain.pem;
  ssl_certificate_key /privkey.pem;

  location ~ ^.*\.git/(HEAD|info/refs|objects/info/.*|git-(upload|recieve)-pack) {
    root /usr/share/nginx/git;

# --- incorrect solution ---

#    if ($1 = git-upload-pack) {
#        auth_basic "Restricted";
#        auth_basic_user_file /usr/share/nginx/htpasswd;
#    }
    client_max_body_size 0;
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME /usr/lib/git-core/git-http-backend;
    fastcgi_param GIT_HTTP_EXPORT_ALL "";
    fastcgi_param GIT_PROJECT_ROOT $realpath_root;
    fastcgi_param REMOTE_USER $remote_user;
    fastcgi_param PATH_INFO $uri;
    fastcgi_param unix:/var/fcgiwrap.socket;

  }

From my understanding, a git push request sends a git-receive-pack to my server. My simple solution was to capture this suffix with $1 and use an if statement, but I found quickly that this is not the correct use for ifs (ifisevil).

Is there a more appropriate solution to what I'm trying to accomplish?

ofirule · Accepted Answer · 2020-05-03 18:54:48Z

5

+25

Try separating the locations:

server {
  listen 443 ssl;
  server_name git.example.com;
  ssl_certificate /fullchain.pem;
  ssl_certificate_key /privkey.pem;

  location ~ ^.*\.git/(HEAD|info/refs|objects/info/.*|git-recieve-pack) {
    # Do your stuff 

  location ~ ^.*\.git/git-upload-pack {
    auth_basic "Restricted";
    auth_basic_user_file /usr/share/nginx/htpasswd;
    # Do your stuff

answered May 3, 2020 at 18:54

ofirule

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7 Comments

ofirule Over a year ago

Maybe I got the regex wrong. But this is the general idea. Feel free to fix it

pairwiseseq Over a year ago

I thought this would work, too, but, for some reason, it still asks me to type in username and password when I clone a remote repo. I am using jgit shell script instead of git, but this shouldn't change how I clone/push repos, right?

ofirule Over a year ago

Look at the nginx access log, and look at the output for both git and jgit. There might be differences

ofirule Over a year ago

Also, according to: git-scm.com/docs/git-http-backend It looks like it's the other way around and you should authenticate on ^.*\.git/git-recieve-pack

ofirule Over a year ago

I think this is the desired behavior when using auth_basic without providing username and password. Maybe this is the way to provide them: stackoverflow.com/questions/6565357/… and maybe you just want application level authentication and authorization instead of auth_basic

|

Dilson Rainov · Accepted Answer · 2020-05-06 02:43:35Z

3

You can auth/deny based on request_method.

        if ($request_method ~* "^(POST|PUT|DELETE)$" ) {
                # check if is there a cookie or something like that
                # and redirect to login if not
        }

answered May 6, 2020 at 2:43

Dilson Rainov

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