diff options
Diffstat (limited to 'daemon.c')
| -rw-r--r-- | daemon.c | 136 |
1 files changed, 54 insertions, 82 deletions
@@ -15,10 +15,11 @@ static int verbose; static const char daemon_usage[] = "git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n" -" [--timeout=n] [--init-timeout=n] [directory...]"; +" [--timeout=n] [--init-timeout=n] [--strict-paths] [directory...]"; /* List of acceptable pathname prefixes */ static char **ok_paths = NULL; +static int strict_paths = 0; /* If this is set, git-daemon-export-ok is not required */ static int export_all_trees = 0; @@ -81,69 +82,56 @@ static void loginfo(const char *err, ...) va_end(params); } -static int path_ok(const char *dir) +static char *path_ok(char *dir) { - const char *p = dir; - char **pp; - int sl, ndot; + char *path = enter_repo(dir, strict_paths); - /* The pathname here should be an absolute path. */ - if ( *p++ != '/' ) - return 0; - - sl = 1; ndot = 0; - - for (;;) { - if ( *p == '.' ) { - ndot++; - } else if ( *p == '\0' ) { - /* Reject "." and ".." at the end of the path */ - if ( sl && ndot > 0 && ndot < 3 ) - return 0; - - /* Otherwise OK */ - break; - } else if ( *p == '/' ) { - /* Refuse "", "." or ".." */ - if ( sl && ndot < 3 ) - return 0; - sl = 1; - ndot = 0; - } else { - sl = ndot = 0; - } - p++; + if (!path) { + logerror("'%s': unable to chdir or not a git archive", dir); + return NULL; } if ( ok_paths && *ok_paths ) { - int ok = 0; + char **pp = NULL; int dirlen = strlen(dir); + int pathlen = strlen(path); for ( pp = ok_paths ; *pp ; pp++ ) { int len = strlen(*pp); - if ( len <= dirlen && - !strncmp(*pp, dir, len) && - (dir[len] == '/' || dir[len] == '\0') ) { - ok = 1; - break; + /* because of symlinks we must match both what the + * user passed and the canonicalized path, otherwise + * the user can send a string matching either a whitelist + * entry or an actual directory exactly and still not + * get through */ + if (len <= pathlen && !memcmp(*pp, path, len)) { + if (path[len] == '\0' || (!strict_paths && path[len] == '/')) + return path; + } + if (len <= dirlen && !memcmp(*pp, dir, len)) { + if (dir[len] == '\0' || (!strict_paths && dir[len] == '/')) + return path; } } - - if ( !ok ) - return 0; /* Path not in whitelist */ + } + else { + /* be backwards compatible */ + if (!strict_paths) + return path; } - return 1; /* Path acceptable */ + logerror("'%s': not in whitelist", path); + return NULL; /* Fallthrough. Deny by default */ } -static int set_dir(const char *dir) +static int upload(char *dir) { - if (!path_ok(dir)) { - errno = EACCES; - return -1; - } + /* Timeout as string */ + char timeout_buf[64]; + const char *path; + + loginfo("Request for '%s'", dir); - if ( chdir(dir) ) + if (!(path = path_ok(dir))) return -1; /* @@ -152,45 +140,17 @@ static int set_dir(const char *dir) * We want a readable HEAD, usable "objects" directory, and * a "git-daemon-export-ok" flag that says that the other side * is ok with us doing this. + * + * path_ok() uses enter_repo() and does whitelist checking. + * We only need to make sure the repository is exported. */ + if (!export_all_trees && access("git-daemon-export-ok", F_OK)) { + logerror("'%s': repository not exported.", path); errno = EACCES; return -1; } - if (access("objects/", X_OK) || access("HEAD", R_OK)) { - errno = EINVAL; - return -1; - } - - /* If all this passed, we're OK */ - return 0; -} - -static int upload(char *dir) -{ - /* Try paths in this order */ - static const char *paths[] = { "%s", "%s/.git", "%s.git", "%s.git/.git", NULL }; - const char **pp; - /* Enough for the longest path above including final null */ - int buflen = strlen(dir)+10; - char *dirbuf = xmalloc(buflen); - /* Timeout as string */ - char timeout_buf[64]; - - loginfo("Request for '%s'", dir); - - for ( pp = paths ; *pp ; pp++ ) { - snprintf(dirbuf, buflen, *pp, dir); - if ( !set_dir(dirbuf) ) - break; - } - - if ( !*pp ) { - logerror("Cannot set directory '%s': %s", dir, strerror(errno)); - return -1; - } - /* * We'll ignore SIGTERM from now on, we have a * good client. @@ -200,7 +160,7 @@ static int upload(char *dir) snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout); /* git-upload-pack only ever reads stuff, so this is safe */ - execlp("git-upload-pack", "git-upload-pack", "--strict", timeout_buf, ".", NULL); + execlp("git-upload-pack", "git-upload-pack", "--strict", timeout_buf, path, NULL); return -1; } @@ -216,7 +176,7 @@ static int execute(void) if (len && line[len-1] == '\n') line[--len] = 0; - if (!strncmp("git-upload-pack /", line, 17)) + if (!strncmp("git-upload-pack ", line, 16)) return upload(line+16); logerror("Protocol error: '%s'", line); @@ -617,6 +577,10 @@ int main(int argc, char **argv) init_timeout = atoi(arg+15); continue; } + if (!strcmp(arg, "--strict-paths")) { + strict_paths = 1; + continue; + } if (!strcmp(arg, "--")) { ok_paths = &argv[i+1]; break; @@ -631,6 +595,14 @@ int main(int argc, char **argv) if (log_syslog) openlog("git-daemon", 0, LOG_DAEMON); + if (strict_paths && (!ok_paths || !*ok_paths)) { + if (!inetd_mode) + die("git-daemon: option --strict-paths requires a whitelist"); + + logerror("option --strict-paths requires a whitelist"); + exit (1); + } + if (inetd_mode) { fclose(stderr); //FIXME: workaround return execute(); |