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daemon: extend user-relative path notation.

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Earlier, we made --base-path to automatically forbid
user-relative paths, which was probably a mistake.  This
introduces --user-path (or --user-path=path) option to control
the use of user-relative paths independently.  The latter form
of the option can be used to restrict accesses to a part of each
user's home directory, similar to "public_html" some webservers
supports.

If we're invoked with --user-path=FOO option, then a URL of the
form git://~USER/PATH/... resolves to the path HOME/FOO/PATH/...,
where HOME is USER's home directory.

[jc: This is much reworked by me so bugs are mine, but the
 original patch was done by Mark Wooding.]

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano 2006-02-04 22:27:29 -08:00
parent 1955fabf41
commit 603968d22b
2 changed files with 54 additions and 10 deletions
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15
Documentation/git-daemon.txt
View File

@ -10,7 +10,8 @@ SYNOPSIS
[verse]
'git-daemon' [--verbose] [--syslog] [--inetd | --port=n] [--export-all]
[--timeout=n] [--init-timeout=n] [--strict-paths]
[--base-path=path] [directory...]
[--base-path=path] [--user-path | --user-path=path]
[directory...]
DESCRIPTION
-----------
@ -42,8 +43,7 @@ OPTIONS
This is sort of "GIT root" - if you run git-daemon with
'--base-path=/srv/git' on example.com, then if you later try to pull
'git://example.com/hello.git', `git-daemon` will interpret the path
as '/srv/git/hello.git'. Home directories (the '~login' notation)
access is disabled.
as '/srv/git/hello.git'.
--export-all::
Allow pulling from all directories that look like GIT repositories
@ -70,6 +70,15 @@ OPTIONS
Log to syslog instead of stderr. Note that this option does not imply
--verbose, thus by default only error conditions will be logged.
--user-path, --user-path=path::
Allow ~user notation to be used in requests. When
specified with no parameter, requests to
git://host/~alice/foo is taken as a request to access
'foo' repository in the home directory of user `alice`.
If `--user-path=path` is specified, the same request is
taken as a request to access `path/foo` repository in
the home directory of user `alice`.
--verbose::
Log details about the incoming connections and requested files.

49
daemon.c
View File

@ -18,7 +18,8 @@ static int reuseaddr;
static const char daemon_usage[] =
"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
" [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
" [--base-path=path] [--reuseaddr] [directory...]";
" [--base-path=path] [--user-path | --user-path=path]\n"
" [--reuseaddr] [directory...]";
/* List of acceptable pathname prefixes */
static char **ok_paths = NULL;
@ -30,6 +31,12 @@ static int export_all_trees = 0;
/* Take all paths relative to this one if non-NULL */
static char *base_path = NULL;
/* If defined, ~user notation is allowed and the string is inserted
* after ~user/. E.g. a request to git://host/~alice/frotz would
* go to /home/alice/pub_git/frotz with --user-path=pub_git.
*/
static char *user_path = NULL;
/* Timeout, and initial timeout */
static unsigned int timeout = 0;
static unsigned int init_timeout = 0;
@ -137,6 +144,7 @@ static int avoid_alias(char *p)
static char *path_ok(char *dir)
{
static char rpath[PATH_MAX];
char *path;
if (avoid_alias(dir)) {
@ -144,12 +152,31 @@ static char *path_ok(char *dir)
return NULL;
}
if (base_path) {
static char rpath[PATH_MAX];
if (!strict_paths && *dir == '~')
; /* allow user relative paths */
else if (*dir != '/') {
/* otherwise allow only absolute */
if (*dir == '~') {
if (!user_path) {
logerror("'%s': User-path not allowed", dir);
return NULL;
}
if (*user_path) {
/* Got either "~alice" or "~alice/foo";
* rewrite them to "~alice/%s" or
* "~alice/%s/foo".
*/
int namlen, restlen = strlen(dir);
char *slash = strchr(dir, '/');
if (!slash)
slash = dir + restlen;
namlen = slash - dir;
restlen -= namlen;
loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
namlen, dir, user_path, restlen, slash);
dir = rpath;
}
}
else if (base_path) {
if (*dir != '/') {
/* Allow only absolute */
logerror("'%s': Non-absolute path denied (base-path active)", dir);
return NULL;
}
@ -688,6 +715,14 @@ int main(int argc, char **argv)
reuseaddr = 1;
continue;
}
if (!strcmp(arg, "--user-path")) {
user_path = "";
continue;
}
if (!strncmp(arg, "--user-path=", 12)) {
user_path = arg + 12;
continue;
}
if (!strcmp(arg, "--")) {
ok_paths = &argv[i+1];
break;