[PATCHv2 1/3] Add config option user-envvar

[Ben Boeckel]

On Mon, Oct 22, 2012 at 08:29:16 GMT, Valentin Haenel wrote:
> When cgit sits on a backend server and relies on a set of
> front-ends to do authentication, it will read the username
> from an environment variable defined by this option.
>
> In this way, one can safely use any forwarded HTTP header
> and not only the expected REMOTE_USER variable set by the
> CGI standard.
>
> Signed-off-by: Valentin Haenel <valentin.haenel at gmx.de>
> ---
>  cgit.c       |   10 ++++++++++
>  cgit.h       |    2 ++
>  cgitrc.5.txt |    6 ++++++
>  3 files changed, 18 insertions(+)
>
> diff --git a/cgit.c b/cgit.c
> index a97ed69653..92e35ae958 100644
> --- a/cgit.c
> +++ b/cgit.c
> @@ -126,6 +126,8 @@ void config_cb(const char *name, const char *value)
>  		repo_config(ctx.repo, name + 5, value);
>  	else if (!strcmp(name, "readme"))
>  		ctx.cfg.readme = xstrdup(value);
> +	else if (!strcmp(name, "user-envvar"))
> +		ctx.cfg.user_envvar = xstrdup(value);
>  	else if (!strcmp(name, "root-title"))
>  		ctx.cfg.root_title = xstrdup(value);
>  	else if (!strcmp(name, "root-desc"))
> @@ -379,6 +381,7 @@ static void prepare_context(struct cgit_context *ctx)
>  	ctx->cfg.summary_tags = 10;
>  	ctx->cfg.max_atom_items = 10;
>  	ctx->cfg.ssdiff = 0;
> +	ctx->cfg.user_envvar = "REMOTE_USER";

Use xstrdupn here. It can't be free'd if it's static like this.

>  	ctx->env.cgit_config = xstrdupn(getenv("CGIT_CONFIG"));
>  	ctx->env.http_host = xstrdupn(getenv("HTTP_HOST"));
>  	ctx->env.https = xstrdupn(getenv("HTTPS"));
> @@ -823,6 +826,13 @@ int main(int argc, const char **argv)
>  	ctx.repo = NULL;
>  	http_parse_querystring(ctx.qry.raw, querystring_cb);
>  
> +	/*
> +	 * Get the username of an authenticated user. It will get
> +	 * from the environment variable defined by the user-header
> +	 * option (defaults to REMOTE_USER)
> +	 */
> +	ctx.env.remote_user = xstrdupn(getenv(ctx.cfg.user_envvar));
> +
>  	/* If virtual-root isn't specified in cgitrc, lets pretend
>  	 * that virtual-root equals SCRIPT_NAME, minus any possibly
>  	 * trailing slashes.
> diff --git a/cgit.h b/cgit.h
> index 7a99135710..016baa8e7d 100644
> --- a/cgit.h
> +++ b/cgit.h
> @@ -166,6 +166,7 @@ struct cgit_query {
>  
>  struct cgit_config {
>  	char *agefile;
> +	char *user_envvar;

It should be free'd where the rest of these are free'd. I don't see that
here.

>  	char *cache_root;
>  	char *clone_prefix;
>  	char *clone_url;
> @@ -263,6 +264,7 @@ struct cgit_environment {
>  	char *script_name;
>  	char *server_name;
>  	char *server_port;
> +	char *remote_user;

Same here.

-- Ben