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https://git.zx2c4.com/cgit
synced 2024-11-09 10:08:42 +00:00
auth: add basic authentication filter framework
This leverages the new lua support. See filters/simple-authentication.lua for explaination of how this works. There is also additional documentation in cgitrc.5.txt. Though this is a cookie-based approach, cgit's caching mechanism is preserved for authenticated pages. Very plugable and extendable depending on user needs. The sample script uses an HMAC-SHA1 based cookie to store the currently logged in user, with an expiration date. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
parent
3741254a69
commit
d6e9200cc3
96
cgit.c
96
cgit.c
@ -192,6 +192,8 @@ static void config_cb(const char *name, const char *value)
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ctx.cfg.commit_filter = cgit_new_filter(value, COMMIT);
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else if (!strcmp(name, "email-filter"))
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ctx.cfg.email_filter = cgit_new_filter(value, EMAIL);
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else if (!strcmp(name, "auth-filter"))
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ctx.cfg.auth_filter = cgit_new_filter(value, AUTH);
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else if (!strcmp(name, "embedded"))
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ctx.cfg.embedded = atoi(value);
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else if (!strcmp(name, "max-atom-items"))
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@ -378,6 +380,10 @@ static void prepare_context(struct cgit_context *ctx)
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ctx->env.script_name = getenv("SCRIPT_NAME");
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ctx->env.server_name = getenv("SERVER_NAME");
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ctx->env.server_port = getenv("SERVER_PORT");
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ctx->env.http_cookie = getenv("HTTP_COOKIE");
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ctx->env.http_referer = getenv("HTTP_REFERER");
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ctx->env.content_length = getenv("CONTENT_LENGTH") ? strtoul(getenv("CONTENT_LENGTH"), NULL, 10) : 0;
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ctx->env.authenticated = 0;
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ctx->page.mimetype = "text/html";
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ctx->page.charset = PAGE_ENCODING;
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ctx->page.filename = NULL;
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@ -593,11 +599,92 @@ static int prepare_repo_cmd(struct cgit_context *ctx)
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return 0;
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}
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static inline void open_auth_filter(struct cgit_context *ctx, const char *function)
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{
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cgit_open_filter(ctx->cfg.auth_filter, function,
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ctx->env.http_cookie ? ctx->env.http_cookie : "",
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ctx->env.request_method ? ctx->env.request_method : "",
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ctx->env.query_string ? ctx->env.query_string : "",
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ctx->env.http_referer ? ctx->env.http_referer : "",
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ctx->env.path_info ? ctx->env.path_info : "",
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ctx->env.http_host ? ctx->env.http_host : "",
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ctx->env.https ? ctx->env.https : "",
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ctx->qry.repo ? ctx->qry.repo : "",
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ctx->qry.page ? ctx->qry.page : "",
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ctx->qry.url ? ctx->qry.url : "");
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}
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#define MAX_AUTHENTICATION_POST_BYTES 4096
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static inline void authenticate_post(struct cgit_context *ctx)
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{
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if (ctx->env.http_referer && strlen(ctx->env.http_referer) > 0) {
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html("Status: 302 Redirect\n");
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html("Cache-Control: no-cache, no-store\n");
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htmlf("Location: %s\n", ctx->env.http_referer);
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} else {
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html("Status: 501 Missing Referer\n");
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html("Cache-Control: no-cache, no-store\n\n");
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exit(0);
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}
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open_auth_filter(ctx, "authenticate-post");
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char buffer[MAX_AUTHENTICATION_POST_BYTES];
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int len;
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len = ctx->env.content_length;
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if (len > MAX_AUTHENTICATION_POST_BYTES)
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len = MAX_AUTHENTICATION_POST_BYTES;
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if (read(STDIN_FILENO, buffer, len) < 0)
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die_errno("Could not read POST from stdin");
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if (write(STDOUT_FILENO, buffer, len) < 0)
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die_errno("Could not write POST to stdout");
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/* The filter may now spit out a Set-Cookie: ... */
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cgit_close_filter(ctx->cfg.auth_filter);
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html("\n");
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exit(0);
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}
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static inline void authenticate_cookie(struct cgit_context *ctx)
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{
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/* If we don't have an auth_filter, consider all cookies valid, and thus return early. */
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if (!ctx->cfg.auth_filter) {
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ctx->env.authenticated = 1;
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return;
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}
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/* If we're having something POST'd to /login, we're authenticating POST,
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* instead of the cookie, so call authenticate_post and bail out early.
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* This pattern here should match /?p=login with POST. */
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if (ctx->env.request_method && ctx->qry.page && !ctx->repo && \
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!strcmp(ctx->env.request_method, "POST") && !strcmp(ctx->qry.page, "login")) {
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authenticate_post(ctx);
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return;
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}
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/* If we've made it this far, we're authenticating the cookie for real, so do that. */
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open_auth_filter(ctx, "authenticate-cookie");
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ctx->env.authenticated = cgit_close_filter(ctx->cfg.auth_filter);
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}
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static void process_request(void *cbdata)
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{
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struct cgit_context *ctx = cbdata;
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struct cgit_cmd *cmd;
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/* If we're not yet authenticated, no matter what page we're on,
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* display the authentication body from the auth_filter. This should
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* never be cached. */
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if (!ctx->env.authenticated) {
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ctx->page.title = "Authentication Required";
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cgit_print_http_headers(ctx);
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cgit_print_docstart(ctx);
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cgit_print_pageheader(ctx);
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open_auth_filter(ctx, "body");
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cgit_close_filter(ctx->cfg.auth_filter);
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cgit_print_docend();
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return;
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}
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cmd = cgit_get_cmd(ctx);
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if (!cmd) {
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ctx->page.title = "cgit error";
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@ -911,6 +998,7 @@ int main(int argc, const char **argv)
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int err, ttl;
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cgit_init_filters();
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atexit(cgit_cleanup_filters);
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prepare_context(&ctx);
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cgit_repolist.length = 0;
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@ -948,18 +1036,22 @@ int main(int argc, const char **argv)
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cgit_parse_url(ctx.qry.url);
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}
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/* Before we go any further, we set ctx.env.authenticated by checking to see
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* if the supplied cookie is valid. All cookies are valid if there is no
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* auth_filter. If there is an auth_filter, the filter decides. */
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authenticate_cookie(&ctx);
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ttl = calc_ttl();
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if (ttl < 0)
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ctx.page.expires += 10 * 365 * 24 * 60 * 60; /* 10 years */
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else
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ctx.page.expires += ttl * 60;
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if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
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if (!ctx.env.authenticated || (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD")))
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ctx.cfg.nocache = 1;
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if (ctx.cfg.nocache)
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ctx.cfg.cache_size = 0;
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err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
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ctx.qry.raw, ttl, process_request, &ctx);
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cgit_cleanup_filters();
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if (err)
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cgit_print_error("Error processing page: %s (%d)",
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strerror(err), err);
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7
cgit.h
7
cgit.h
@ -53,7 +53,7 @@ typedef void (*filepair_fn)(struct diff_filepair *pair);
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typedef void (*linediff_fn)(char *line, int len);
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typedef enum {
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ABOUT, COMMIT, SOURCE, EMAIL
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ABOUT, COMMIT, SOURCE, EMAIL, AUTH
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} filter_type;
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struct cgit_filter {
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@ -252,6 +252,7 @@ struct cgit_config {
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struct cgit_filter *commit_filter;
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struct cgit_filter *source_filter;
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struct cgit_filter *email_filter;
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struct cgit_filter *auth_filter;
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};
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struct cgit_page {
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@ -278,6 +279,10 @@ struct cgit_environment {
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const char *script_name;
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const char *server_name;
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const char *server_port;
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const char *http_cookie;
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const char *http_referer;
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unsigned int content_length;
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int authenticated;
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};
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struct cgit_context {
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36
cgitrc.5.txt
36
cgitrc.5.txt
@ -42,6 +42,13 @@ agefile::
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hh:mm:ss". You may want to generate this file from a post-receive
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hook. Default value: "info/web/last-modified".
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auth-filter::
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Specifies a command that will be invoked for authenticating repository
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access. Receives quite a few arguments, and data on both stdin and
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stdout for authentication processing. Details follow later in this
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document. If no auth-filter is specified, no authentication is
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performed. Default value: none. See also: "FILTER API".
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branch-sort::
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Flag which, when set to "age", enables date ordering in the branch ref
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list, and when set to "name" enables ordering by branch name. Default
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@ -605,6 +612,8 @@ specification with the relevant string; available values are:
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URL escapes for a path and writes 'str' to the webpage.
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'html_url_arg(str)'::
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URL escapes for an argument and writes 'str' to the webpage.
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'html_include(file)'::
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Includes 'file' in webpage.
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Parameters are provided to filters as follows.
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@ -635,7 +644,32 @@ source filter::
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file that is to be filtered is available on standard input and the
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filtered contents is expected on standard output.
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Also, all filters are handed the following environment variables:
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auth filter::
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The authentication filter receives 11 parameters:
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- filter action, explained below, which specifies which action the
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filter is called for
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- http cookie
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- http method
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- http referer
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- http path
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- http https flag
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- cgit repo
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- cgit page
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- cgit url
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When the filter action is "body", this filter must write to output the
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HTML for displaying the login form, which POSTs to "/?p=login". When
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the filter action is "authenticate-cookie", this filter must validate
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the http cookie and return a 0 if it is invalid or 1 if it is invalid,
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in the exit code / close function. If the filter action is
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"authenticate-post", this filter receives POST'd parameters on
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standard input, and should write to output one or more "Set-Cookie"
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HTTP headers, each followed by a newline.
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Please see `filters/simple-authentication.lua` for a clear example
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script that may be modified.
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All filters are handed the following environment variables:
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- CGIT_REPO_URL (from repo.url)
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- CGIT_REPO_NAME (from repo.name)
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filter.c
11
filter.c
@ -244,6 +244,11 @@ static int html_url_arg_lua_filter(lua_State *lua_state)
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return hook_lua_filter(lua_state, html_url_arg);
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}
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static int html_include_lua_filter(lua_State *lua_state)
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{
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return hook_lua_filter(lua_state, (void (*)(const char *))html_include);
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}
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static void cleanup_lua_filter(struct cgit_filter *base)
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{
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struct lua_filter *filter = (struct lua_filter *)base;
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@ -279,6 +284,8 @@ static int init_lua_filter(struct lua_filter *filter)
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lua_setglobal(filter->lua_state, "html_url_path");
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lua_pushcfunction(filter->lua_state, html_url_arg_lua_filter);
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lua_setglobal(filter->lua_state, "html_url_arg");
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lua_pushcfunction(filter->lua_state, html_include_lua_filter);
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lua_setglobal(filter->lua_state, "html_include");
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if (luaL_dofile(filter->lua_state, filter->script_file)) {
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error_lua_filter(filter);
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@ -409,6 +416,10 @@ struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
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colon = NULL;
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switch (filtertype) {
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case AUTH:
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argument_count = 11;
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break;
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case EMAIL:
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argument_count = 2;
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break;
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225
filters/simple-authentication.lua
Normal file
225
filters/simple-authentication.lua
Normal file
@ -0,0 +1,225 @@
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-- This script may be used with the auth-filter. Be sure to configure it as you wish.
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--
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-- Requirements:
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-- luacrypto >= 0.3
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-- <http://mkottman.github.io/luacrypto/>
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--
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--
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--
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-- Configure these variables for your settings.
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--
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--
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local protected_repos = {
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glouglou = { laurent = true, jason = true },
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qt = { jason = true, bob = true }
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}
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local users = {
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jason = "secretpassword",
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laurent = "s3cr3t",
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bob = "ilikelua"
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}
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local secret = "BE SURE TO CUSTOMIZE THIS STRING TO SOMETHING BIG AND RANDOM"
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--
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--
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-- Authentication functions follow below. Swap these out if you want different authentication semantics.
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--
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--
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-- Sets HTTP cookie headers based on post
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function authenticate_post()
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local password = users[post["username"]]
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-- TODO: Implement time invariant string comparison function to mitigate against timing attack.
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if password == nil or password ~= post["password"] then
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construct_cookie("", "cgitauth")
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else
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construct_cookie(post["username"], "cgitauth")
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end
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return 0
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end
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-- Returns 1 if the cookie is valid and 0 if it is not.
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function authenticate_cookie()
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accepted_users = protected_repos[cgit["repo"]]
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if accepted_users == nil then
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-- We return as valid if the repo is not protected.
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return 1
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end
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local username = validate_cookie(get_cookie(http["cookie"], "cgitauth"))
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if username == nil or not accepted_users[username] then
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return 0
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else
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return 1
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end
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end
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-- Prints the html for the login form.
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function body()
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html("<h2>Authentication Required</h2>")
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html("<form method='post' action='")
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html_attr(cgit["login"])
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html("'>")
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html("<table>")
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html("<tr><td><label for='username'>Username:</label></td><td><input id='username' name='username' autofocus /></td></tr>")
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html("<tr><td><label for='password'>Password:</label></td><td><input id='password' name='password' type='password' /></td></tr>")
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html("<tr><td colspan='2'><input value='Login' type='submit' /></td></tr>")
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html("</table></form>")
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return 0
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end
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--
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--
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-- Cookie construction and validation helpers.
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--
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--
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local crypto = require("crypto")
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-- Returns username of cookie if cookie is valid. Otherwise returns nil.
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function validate_cookie(cookie)
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local i = 0
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local username = ""
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local expiration = 0
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local salt = ""
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local hmac = ""
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if cookie:len() < 3 or cookie:sub(1, 1) == "|" then
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return nil
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end
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for component in string.gmatch(cookie, "[^|]+") do
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if i == 0 then
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username = component
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elseif i == 1 then
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expiration = tonumber(component)
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if expiration == nil then
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expiration = 0
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end
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elseif i == 2 then
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salt = component
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elseif i == 3 then
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hmac = component
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else
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break
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end
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i = i + 1
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end
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if hmac == nil or hmac:len() == 0 then
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return nil
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end
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-- TODO: implement time invariant comparison to prevent against timing attack.
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if hmac ~= crypto.hmac.digest("sha1", username .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
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return nil
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end
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if expiration <= os.time() then
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return nil
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end
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return username:lower()
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end
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function construct_cookie(username, cookie)
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local authstr = ""
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if username:len() > 0 then
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-- One week expiration time
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local expiration = os.time() + 604800
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local salt = crypto.hex(crypto.rand.bytes(16))
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authstr = username .. "|" .. tostring(expiration) .. "|" .. salt
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authstr = authstr .. "|" .. crypto.hmac.digest("sha1", authstr, secret)
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end
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html("Set-Cookie: " .. cookie .. "=" .. authstr .. "; HttpOnly")
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if http["https"] == "yes" or http["https"] == "on" or http["https"] == "1" then
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html("; secure")
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end
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html("\n")
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end
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--
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--
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-- Wrapper around filter API follows below, exposing the http table, the cgit table, and the post table to the above functions.
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--
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--
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local actions = {}
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actions["authenticate-post"] = authenticate_post
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actions["authenticate-cookie"] = authenticate_cookie
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actions["body"] = body
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function filter_open(...)
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action = actions[select(1, ...)]
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http = {}
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http["cookie"] = select(2, ...)
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http["method"] = select(3, ...)
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http["query"] = select(4, ...)
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http["referer"] = select(5, ...)
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http["path"] = select(6, ...)
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http["host"] = select(7, ...)
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http["https"] = select(8, ...)
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cgit = {}
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cgit["repo"] = select(9, ...)
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cgit["page"] = select(10, ...)
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cgit["url"] = select(11, ...)
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cgit["login"] = ""
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for _ in cgit["url"]:gfind("/") do
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cgit["login"] = cgit["login"] .. "../"
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end
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cgit["login"] = cgit["login"] .. "?p=login"
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end
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function filter_close()
|
||||
return action()
|
||||
end
|
||||
|
||||
function filter_write(str)
|
||||
post = parse_qs(str)
|
||||
end
|
||||
|
||||
|
||||
--
|
||||
--
|
||||
-- Utility functions follow below, based on keplerproject/wsapi.
|
||||
--
|
||||
--
|
||||
|
||||
function url_decode(str)
|
||||
if not str then
|
||||
return ""
|
||||
end
|
||||
str = string.gsub(str, "+", " ")
|
||||
str = string.gsub(str, "%%(%x%x)", function(h) return string.char(tonumber(h, 16)) end)
|
||||
str = string.gsub(str, "\r\n", "\n")
|
||||
return str
|
||||
end
|
||||
|
||||
function parse_qs(qs)
|
||||
local tab = {}
|
||||
for key, val in string.gmatch(qs, "([^&=]+)=([^&=]*)&?") do
|
||||
tab[url_decode(key)] = url_decode(val)
|
||||
end
|
||||
return tab
|
||||
end
|
||||
|
||||
function get_cookie(cookies, name)
|
||||
cookies = string.gsub(";" .. cookies .. ";", "%s*;%s*", ";")
|
||||
return url_decode(string.match(cookies, ";" .. name .. "=(.-);"))
|
||||
end
|
28
ui-shared.c
28
ui-shared.c
@ -641,6 +641,8 @@ void cgit_print_http_headers(struct cgit_context *ctx)
|
||||
if (ctx->page.filename)
|
||||
htmlf("Content-Disposition: inline; filename=\"%s\"\n",
|
||||
ctx->page.filename);
|
||||
if (!ctx->env.authenticated)
|
||||
html("Cache-Control: no-cache, no-store\n");
|
||||
htmlf("Last-Modified: %s\n", http_date(ctx->page.modified));
|
||||
htmlf("Expires: %s\n", http_date(ctx->page.expires));
|
||||
if (ctx->page.etag)
|
||||
@ -814,14 +816,16 @@ static void print_header(struct cgit_context *ctx)
|
||||
cgit_index_link("index", NULL, NULL, NULL, NULL, 0);
|
||||
html(" : ");
|
||||
cgit_summary_link(ctx->repo->name, ctx->repo->name, NULL, NULL);
|
||||
html("</td><td class='form'>");
|
||||
html("<form method='get' action=''>\n");
|
||||
cgit_add_hidden_formfields(0, 1, ctx->qry.page);
|
||||
html("<select name='h' onchange='this.form.submit();'>\n");
|
||||
for_each_branch_ref(print_branch_option, ctx->qry.head);
|
||||
html("</select> ");
|
||||
html("<input type='submit' name='' value='switch'/>");
|
||||
html("</form>");
|
||||
if (ctx->env.authenticated) {
|
||||
html("</td><td class='form'>");
|
||||
html("<form method='get' action=''>\n");
|
||||
cgit_add_hidden_formfields(0, 1, ctx->qry.page);
|
||||
html("<select name='h' onchange='this.form.submit();'>\n");
|
||||
for_each_branch_ref(print_branch_option, ctx->qry.head);
|
||||
html("</select> ");
|
||||
html("<input type='submit' name='' value='switch'/>");
|
||||
html("</form>");
|
||||
}
|
||||
} else
|
||||
html_txt(ctx->cfg.root_title);
|
||||
html("</td></tr>\n");
|
||||
@ -843,11 +847,11 @@ static void print_header(struct cgit_context *ctx)
|
||||
void cgit_print_pageheader(struct cgit_context *ctx)
|
||||
{
|
||||
html("<div id='cgit'>");
|
||||
if (!ctx->cfg.noheader)
|
||||
if (!ctx->env.authenticated || !ctx->cfg.noheader)
|
||||
print_header(ctx);
|
||||
|
||||
html("<table class='tabs'><tr><td>\n");
|
||||
if (ctx->repo) {
|
||||
if (ctx->env.authenticated && ctx->repo) {
|
||||
cgit_summary_link("summary", NULL, hc(ctx, "summary"),
|
||||
ctx->qry.head);
|
||||
cgit_refs_link("refs", NULL, hc(ctx, "refs"), ctx->qry.head,
|
||||
@ -886,7 +890,7 @@ void cgit_print_pageheader(struct cgit_context *ctx)
|
||||
html("'/>\n");
|
||||
html("<input type='submit' value='search'/>\n");
|
||||
html("</form>\n");
|
||||
} else {
|
||||
} else if (ctx->env.authenticated) {
|
||||
site_link(NULL, "index", NULL, hc(ctx, "repolist"), NULL, NULL, 0);
|
||||
if (ctx->cfg.root_readme)
|
||||
site_link("about", "about", NULL, hc(ctx, "about"),
|
||||
@ -902,7 +906,7 @@ void cgit_print_pageheader(struct cgit_context *ctx)
|
||||
html("</form>");
|
||||
}
|
||||
html("</td></tr></table>\n");
|
||||
if (ctx->qry.vpath) {
|
||||
if (ctx->env.authenticated && ctx->qry.vpath) {
|
||||
html("<div class='path'>");
|
||||
html("path: ");
|
||||
cgit_print_path_crumbs(ctx, ctx->qry.vpath);
|
||||
|
Loading…
Reference in New Issue
Block a user