mirror of
https://github.com/git/git
synced 2024-08-28 20:20:07 +00:00
1291 lines
29 KiB
C
1291 lines
29 KiB
C
#include "cache.h"
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#include "pkt-line.h"
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#include "exec_cmd.h"
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#include "run-command.h"
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#include "strbuf.h"
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#include "string-list.h"
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#ifndef HOST_NAME_MAX
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#define HOST_NAME_MAX 256
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#endif
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#ifndef NI_MAXSERV
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#define NI_MAXSERV 32
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#endif
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#ifdef NO_INITGROUPS
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#define initgroups(x, y) (0) /* nothing */
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#endif
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static int log_syslog;
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static int verbose;
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static int reuseaddr;
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static int informative_errors;
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static const char daemon_usage[] =
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"git daemon [--verbose] [--syslog] [--export-all]\n"
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" [--timeout=<n>] [--init-timeout=<n>] [--max-connections=<n>]\n"
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" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
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" [--user-path | --user-path=<path>]\n"
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" [--interpolated-path=<path>]\n"
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" [--reuseaddr] [--pid-file=<file>]\n"
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" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
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" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
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" [--detach] [--user=<user> [--group=<group>]]\n"
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" [<directory>...]";
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/* List of acceptable pathname prefixes */
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static char **ok_paths;
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static int strict_paths;
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/* If this is set, git-daemon-export-ok is not required */
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static int export_all_trees;
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/* Take all paths relative to this one if non-NULL */
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static char *base_path;
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static char *interpolated_path;
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static int base_path_relaxed;
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/* Flag indicating client sent extra args. */
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static int saw_extended_args;
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/* If defined, ~user notation is allowed and the string is inserted
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* after ~user/. E.g. a request to git://host/~alice/frotz would
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* go to /home/alice/pub_git/frotz with --user-path=pub_git.
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*/
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static const char *user_path;
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/* Timeout, and initial timeout */
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static unsigned int timeout;
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static unsigned int init_timeout;
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static char *hostname;
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static char *canon_hostname;
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static char *ip_address;
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static char *tcp_port;
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static void logreport(int priority, const char *err, va_list params)
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{
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if (log_syslog) {
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char buf[1024];
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vsnprintf(buf, sizeof(buf), err, params);
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syslog(priority, "%s", buf);
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} else {
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/*
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* Since stderr is set to buffered mode, the
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* logging of different processes will not overlap
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* unless they overflow the (rather big) buffers.
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*/
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fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
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vfprintf(stderr, err, params);
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fputc('\n', stderr);
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fflush(stderr);
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}
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}
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__attribute__((format (printf, 1, 2)))
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static void logerror(const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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logreport(LOG_ERR, err, params);
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va_end(params);
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}
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__attribute__((format (printf, 1, 2)))
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static void loginfo(const char *err, ...)
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{
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va_list params;
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if (!verbose)
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return;
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va_start(params, err);
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logreport(LOG_INFO, err, params);
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va_end(params);
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}
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static void NORETURN daemon_die(const char *err, va_list params)
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{
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logreport(LOG_ERR, err, params);
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exit(1);
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}
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static const char *path_ok(char *directory)
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{
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static char rpath[PATH_MAX];
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static char interp_path[PATH_MAX];
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const char *path;
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char *dir;
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dir = directory;
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if (daemon_avoid_alias(dir)) {
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logerror("'%s': aliased", dir);
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return NULL;
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}
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if (*dir == '~') {
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if (!user_path) {
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logerror("'%s': User-path not allowed", dir);
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return NULL;
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}
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if (*user_path) {
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/* Got either "~alice" or "~alice/foo";
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* rewrite them to "~alice/%s" or
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* "~alice/%s/foo".
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*/
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int namlen, restlen = strlen(dir);
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char *slash = strchr(dir, '/');
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if (!slash)
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slash = dir + restlen;
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namlen = slash - dir;
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restlen -= namlen;
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loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
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snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
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namlen, dir, user_path, restlen, slash);
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dir = rpath;
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}
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}
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else if (interpolated_path && saw_extended_args) {
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struct strbuf expanded_path = STRBUF_INIT;
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struct strbuf_expand_dict_entry dict[6];
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dict[0].placeholder = "H"; dict[0].value = hostname;
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dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
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dict[2].placeholder = "IP"; dict[2].value = ip_address;
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dict[3].placeholder = "P"; dict[3].value = tcp_port;
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dict[4].placeholder = "D"; dict[4].value = directory;
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dict[5].placeholder = NULL; dict[5].value = NULL;
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if (*dir != '/') {
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/* Allow only absolute */
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logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
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return NULL;
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}
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strbuf_expand(&expanded_path, interpolated_path,
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strbuf_expand_dict_cb, &dict);
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strlcpy(interp_path, expanded_path.buf, PATH_MAX);
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strbuf_release(&expanded_path);
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loginfo("Interpolated dir '%s'", interp_path);
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dir = interp_path;
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}
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else if (base_path) {
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if (*dir != '/') {
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/* Allow only absolute */
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logerror("'%s': Non-absolute path denied (base-path active)", dir);
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return NULL;
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}
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snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
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dir = rpath;
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}
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path = enter_repo(dir, strict_paths);
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if (!path && base_path && base_path_relaxed) {
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/*
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* if we fail and base_path_relaxed is enabled, try without
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* prefixing the base path
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*/
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dir = directory;
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path = enter_repo(dir, strict_paths);
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}
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if (!path) {
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logerror("'%s' does not appear to be a git repository", dir);
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return NULL;
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}
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if ( ok_paths && *ok_paths ) {
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char **pp;
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int pathlen = strlen(path);
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/* The validation is done on the paths after enter_repo
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* appends optional {.git,.git/.git} and friends, but
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* it does not use getcwd(). So if your /pub is
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* a symlink to /mnt/pub, you can whitelist /pub and
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* do not have to say /mnt/pub.
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* Do not say /pub/.
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*/
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for ( pp = ok_paths ; *pp ; pp++ ) {
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int len = strlen(*pp);
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if (len <= pathlen &&
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!memcmp(*pp, path, len) &&
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(path[len] == '\0' ||
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(!strict_paths && path[len] == '/')))
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return path;
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}
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}
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else {
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/* be backwards compatible */
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if (!strict_paths)
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return path;
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}
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logerror("'%s': not in whitelist", path);
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return NULL; /* Fallthrough. Deny by default */
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}
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typedef int (*daemon_service_fn)(void);
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struct daemon_service {
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const char *name;
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const char *config_name;
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daemon_service_fn fn;
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int enabled;
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int overridable;
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};
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static struct daemon_service *service_looking_at;
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static int service_enabled;
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static int git_daemon_config(const char *var, const char *value, void *cb)
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{
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if (!prefixcmp(var, "daemon.") &&
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!strcmp(var + 7, service_looking_at->config_name)) {
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service_enabled = git_config_bool(var, value);
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return 0;
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}
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/* we are not interested in parsing any other configuration here */
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return 0;
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}
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static int daemon_error(const char *dir, const char *msg)
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{
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if (!informative_errors)
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msg = "access denied or repository not exported";
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packet_write(1, "ERR %s: %s", msg, dir);
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return -1;
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}
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static int run_service(char *dir, struct daemon_service *service)
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{
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const char *path;
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int enabled = service->enabled;
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loginfo("Request %s for '%s'", service->name, dir);
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if (!enabled && !service->overridable) {
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logerror("'%s': service not enabled.", service->name);
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errno = EACCES;
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return daemon_error(dir, "service not enabled");
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}
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if (!(path = path_ok(dir)))
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return daemon_error(dir, "no such repository");
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/*
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* Security on the cheap.
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*
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* We want a readable HEAD, usable "objects" directory, and
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* a "git-daemon-export-ok" flag that says that the other side
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* is ok with us doing this.
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*
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* path_ok() uses enter_repo() and does whitelist checking.
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* We only need to make sure the repository is exported.
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*/
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if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
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logerror("'%s': repository not exported.", path);
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errno = EACCES;
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return daemon_error(dir, "repository not exported");
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}
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if (service->overridable) {
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service_looking_at = service;
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service_enabled = -1;
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git_config(git_daemon_config, NULL);
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if (0 <= service_enabled)
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enabled = service_enabled;
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}
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if (!enabled) {
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logerror("'%s': service not enabled for '%s'",
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service->name, path);
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errno = EACCES;
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return daemon_error(dir, "service not enabled");
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}
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/*
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* We'll ignore SIGTERM from now on, we have a
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* good client.
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*/
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signal(SIGTERM, SIG_IGN);
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return service->fn();
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}
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static void copy_to_log(int fd)
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{
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struct strbuf line = STRBUF_INIT;
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FILE *fp;
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fp = fdopen(fd, "r");
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if (fp == NULL) {
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logerror("fdopen of error channel failed");
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close(fd);
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return;
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}
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while (strbuf_getline(&line, fp, '\n') != EOF) {
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logerror("%s", line.buf);
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strbuf_setlen(&line, 0);
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}
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strbuf_release(&line);
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fclose(fp);
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}
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static int run_service_command(const char **argv)
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{
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struct child_process cld;
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memset(&cld, 0, sizeof(cld));
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cld.argv = argv;
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cld.git_cmd = 1;
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cld.err = -1;
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if (start_command(&cld))
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return -1;
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close(0);
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close(1);
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copy_to_log(cld.err);
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return finish_command(&cld);
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}
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static int upload_pack(void)
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{
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/* Timeout as string */
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char timeout_buf[64];
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const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
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argv[2] = timeout_buf;
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snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
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return run_service_command(argv);
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}
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static int upload_archive(void)
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{
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static const char *argv[] = { "upload-archive", ".", NULL };
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return run_service_command(argv);
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}
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static int receive_pack(void)
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{
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static const char *argv[] = { "receive-pack", ".", NULL };
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return run_service_command(argv);
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}
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static struct daemon_service daemon_service[] = {
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{ "upload-archive", "uploadarch", upload_archive, 0, 1 },
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{ "upload-pack", "uploadpack", upload_pack, 1, 1 },
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{ "receive-pack", "receivepack", receive_pack, 0, 1 },
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};
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static void enable_service(const char *name, int ena)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
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if (!strcmp(daemon_service[i].name, name)) {
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daemon_service[i].enabled = ena;
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return;
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}
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}
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die("No such service %s", name);
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}
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static void make_service_overridable(const char *name, int ena)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
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if (!strcmp(daemon_service[i].name, name)) {
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daemon_service[i].overridable = ena;
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return;
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}
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}
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die("No such service %s", name);
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}
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static char *xstrdup_tolower(const char *str)
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{
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char *p, *dup = xstrdup(str);
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for (p = dup; *p; p++)
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*p = tolower(*p);
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return dup;
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}
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static void parse_host_and_port(char *hostport, char **host,
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char **port)
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{
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if (*hostport == '[') {
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char *end;
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end = strchr(hostport, ']');
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if (!end)
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die("Invalid request ('[' without ']')");
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*end = '\0';
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*host = hostport + 1;
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if (!end[1])
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*port = NULL;
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else if (end[1] == ':')
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*port = end + 2;
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else
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die("Garbage after end of host part");
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} else {
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*host = hostport;
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*port = strrchr(hostport, ':');
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if (*port) {
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**port = '\0';
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++*port;
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}
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}
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}
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/*
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* Read the host as supplied by the client connection.
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*/
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static void parse_host_arg(char *extra_args, int buflen)
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{
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char *val;
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int vallen;
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char *end = extra_args + buflen;
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if (extra_args < end && *extra_args) {
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saw_extended_args = 1;
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if (strncasecmp("host=", extra_args, 5) == 0) {
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val = extra_args + 5;
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vallen = strlen(val) + 1;
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if (*val) {
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/* Split <host>:<port> at colon. */
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char *host;
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char *port;
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parse_host_and_port(val, &host, &port);
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if (port) {
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free(tcp_port);
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tcp_port = xstrdup(port);
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}
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free(hostname);
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hostname = xstrdup_tolower(host);
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}
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/* On to the next one */
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extra_args = val + vallen;
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}
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if (extra_args < end && *extra_args)
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die("Invalid request");
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}
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/*
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* Locate canonical hostname and its IP address.
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*/
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if (hostname) {
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#ifndef NO_IPV6
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struct addrinfo hints;
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struct addrinfo *ai;
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int gai;
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static char addrbuf[HOST_NAME_MAX + 1];
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = AI_CANONNAME;
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gai = getaddrinfo(hostname, NULL, &hints, &ai);
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if (!gai) {
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struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
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inet_ntop(AF_INET, &sin_addr->sin_addr,
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addrbuf, sizeof(addrbuf));
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free(ip_address);
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ip_address = xstrdup(addrbuf);
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free(canon_hostname);
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canon_hostname = xstrdup(ai->ai_canonname ?
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ai->ai_canonname : ip_address);
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freeaddrinfo(ai);
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}
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#else
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struct hostent *hent;
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struct sockaddr_in sa;
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char **ap;
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static char addrbuf[HOST_NAME_MAX + 1];
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hent = gethostbyname(hostname);
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ap = hent->h_addr_list;
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memset(&sa, 0, sizeof sa);
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sa.sin_family = hent->h_addrtype;
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sa.sin_port = htons(0);
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memcpy(&sa.sin_addr, *ap, hent->h_length);
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inet_ntop(hent->h_addrtype, &sa.sin_addr,
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addrbuf, sizeof(addrbuf));
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free(canon_hostname);
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canon_hostname = xstrdup(hent->h_name);
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free(ip_address);
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ip_address = xstrdup(addrbuf);
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#endif
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}
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}
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static int execute(void)
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{
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static char line[1000];
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int pktlen, len, i;
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char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
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if (addr)
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loginfo("Connection from %s:%s", addr, port);
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alarm(init_timeout ? init_timeout : timeout);
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pktlen = packet_read_line(0, line, sizeof(line));
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alarm(0);
|
|
|
|
len = strlen(line);
|
|
if (pktlen != len)
|
|
loginfo("Extended attributes (%d bytes) exist <%.*s>",
|
|
(int) pktlen - len,
|
|
(int) pktlen - len, line + len + 1);
|
|
if (len && line[len-1] == '\n') {
|
|
line[--len] = 0;
|
|
pktlen--;
|
|
}
|
|
|
|
free(hostname);
|
|
free(canon_hostname);
|
|
free(ip_address);
|
|
free(tcp_port);
|
|
hostname = canon_hostname = ip_address = tcp_port = NULL;
|
|
|
|
if (len != pktlen)
|
|
parse_host_arg(line + len + 1, pktlen - len - 1);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
|
|
struct daemon_service *s = &(daemon_service[i]);
|
|
int namelen = strlen(s->name);
|
|
if (!prefixcmp(line, "git-") &&
|
|
!strncmp(s->name, line + 4, namelen) &&
|
|
line[namelen + 4] == ' ') {
|
|
/*
|
|
* Note: The directory here is probably context sensitive,
|
|
* and might depend on the actual service being performed.
|
|
*/
|
|
return run_service(line + namelen + 5, s);
|
|
}
|
|
}
|
|
|
|
logerror("Protocol error: '%s'", line);
|
|
return -1;
|
|
}
|
|
|
|
static int addrcmp(const struct sockaddr_storage *s1,
|
|
const struct sockaddr_storage *s2)
|
|
{
|
|
const struct sockaddr *sa1 = (const struct sockaddr*) s1;
|
|
const struct sockaddr *sa2 = (const struct sockaddr*) s2;
|
|
|
|
if (sa1->sa_family != sa2->sa_family)
|
|
return sa1->sa_family - sa2->sa_family;
|
|
if (sa1->sa_family == AF_INET)
|
|
return memcmp(&((struct sockaddr_in *)s1)->sin_addr,
|
|
&((struct sockaddr_in *)s2)->sin_addr,
|
|
sizeof(struct in_addr));
|
|
#ifndef NO_IPV6
|
|
if (sa1->sa_family == AF_INET6)
|
|
return memcmp(&((struct sockaddr_in6 *)s1)->sin6_addr,
|
|
&((struct sockaddr_in6 *)s2)->sin6_addr,
|
|
sizeof(struct in6_addr));
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int max_connections = 32;
|
|
|
|
static unsigned int live_children;
|
|
|
|
static struct child {
|
|
struct child *next;
|
|
struct child_process cld;
|
|
struct sockaddr_storage address;
|
|
} *firstborn;
|
|
|
|
static void add_child(struct child_process *cld, struct sockaddr *addr, socklen_t addrlen)
|
|
{
|
|
struct child *newborn, **cradle;
|
|
|
|
newborn = xcalloc(1, sizeof(*newborn));
|
|
live_children++;
|
|
memcpy(&newborn->cld, cld, sizeof(*cld));
|
|
memcpy(&newborn->address, addr, addrlen);
|
|
for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
|
|
if (!addrcmp(&(*cradle)->address, &newborn->address))
|
|
break;
|
|
newborn->next = *cradle;
|
|
*cradle = newborn;
|
|
}
|
|
|
|
/*
|
|
* This gets called if the number of connections grows
|
|
* past "max_connections".
|
|
*
|
|
* We kill the newest connection from a duplicate IP.
|
|
*/
|
|
static void kill_some_child(void)
|
|
{
|
|
const struct child *blanket, *next;
|
|
|
|
if (!(blanket = firstborn))
|
|
return;
|
|
|
|
for (; (next = blanket->next); blanket = next)
|
|
if (!addrcmp(&blanket->address, &next->address)) {
|
|
kill(blanket->cld.pid, SIGTERM);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void check_dead_children(void)
|
|
{
|
|
int status;
|
|
pid_t pid;
|
|
|
|
struct child **cradle, *blanket;
|
|
for (cradle = &firstborn; (blanket = *cradle);)
|
|
if ((pid = waitpid(blanket->cld.pid, &status, WNOHANG)) > 1) {
|
|
const char *dead = "";
|
|
if (status)
|
|
dead = " (with error)";
|
|
loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
|
|
|
|
/* remove the child */
|
|
*cradle = blanket->next;
|
|
live_children--;
|
|
free(blanket);
|
|
} else
|
|
cradle = &blanket->next;
|
|
}
|
|
|
|
static char **cld_argv;
|
|
static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
|
|
{
|
|
struct child_process cld = { NULL };
|
|
char addrbuf[300] = "REMOTE_ADDR=", portbuf[300];
|
|
char *env[] = { addrbuf, portbuf, NULL };
|
|
|
|
if (max_connections && live_children >= max_connections) {
|
|
kill_some_child();
|
|
sleep(1); /* give it some time to die */
|
|
check_dead_children();
|
|
if (live_children >= max_connections) {
|
|
close(incoming);
|
|
logerror("Too many children, dropping connection");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (addr->sa_family == AF_INET) {
|
|
struct sockaddr_in *sin_addr = (void *) addr;
|
|
inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf + 12,
|
|
sizeof(addrbuf) - 12);
|
|
snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
|
|
ntohs(sin_addr->sin_port));
|
|
#ifndef NO_IPV6
|
|
} else if (addr && addr->sa_family == AF_INET6) {
|
|
struct sockaddr_in6 *sin6_addr = (void *) addr;
|
|
|
|
char *buf = addrbuf + 12;
|
|
*buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
|
|
inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf,
|
|
sizeof(addrbuf) - 13);
|
|
strcat(buf, "]");
|
|
|
|
snprintf(portbuf, sizeof(portbuf), "REMOTE_PORT=%d",
|
|
ntohs(sin6_addr->sin6_port));
|
|
#endif
|
|
}
|
|
|
|
cld.env = (const char **)env;
|
|
cld.argv = (const char **)cld_argv;
|
|
cld.in = incoming;
|
|
cld.out = dup(incoming);
|
|
|
|
if (start_command(&cld))
|
|
logerror("unable to fork");
|
|
else
|
|
add_child(&cld, addr, addrlen);
|
|
close(incoming);
|
|
}
|
|
|
|
static void child_handler(int signo)
|
|
{
|
|
/*
|
|
* Otherwise empty handler because systemcalls will get interrupted
|
|
* upon signal receipt
|
|
* SysV needs the handler to be rearmed
|
|
*/
|
|
signal(SIGCHLD, child_handler);
|
|
}
|
|
|
|
static int set_reuse_addr(int sockfd)
|
|
{
|
|
int on = 1;
|
|
|
|
if (!reuseaddr)
|
|
return 0;
|
|
return setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
|
|
&on, sizeof(on));
|
|
}
|
|
|
|
struct socketlist {
|
|
int *list;
|
|
size_t nr;
|
|
size_t alloc;
|
|
};
|
|
|
|
static const char *ip2str(int family, struct sockaddr *sin, socklen_t len)
|
|
{
|
|
#ifdef NO_IPV6
|
|
static char ip[INET_ADDRSTRLEN];
|
|
#else
|
|
static char ip[INET6_ADDRSTRLEN];
|
|
#endif
|
|
|
|
switch (family) {
|
|
#ifndef NO_IPV6
|
|
case AF_INET6:
|
|
inet_ntop(family, &((struct sockaddr_in6*)sin)->sin6_addr, ip, len);
|
|
break;
|
|
#endif
|
|
case AF_INET:
|
|
inet_ntop(family, &((struct sockaddr_in*)sin)->sin_addr, ip, len);
|
|
break;
|
|
default:
|
|
strcpy(ip, "<unknown>");
|
|
}
|
|
return ip;
|
|
}
|
|
|
|
#ifndef NO_IPV6
|
|
|
|
static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
|
|
{
|
|
int socknum = 0;
|
|
int maxfd = -1;
|
|
char pbuf[NI_MAXSERV];
|
|
struct addrinfo hints, *ai0, *ai;
|
|
int gai;
|
|
long flags;
|
|
|
|
sprintf(pbuf, "%d", listen_port);
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = AF_UNSPEC;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
hints.ai_protocol = IPPROTO_TCP;
|
|
hints.ai_flags = AI_PASSIVE;
|
|
|
|
gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
|
|
if (gai) {
|
|
logerror("getaddrinfo() for %s failed: %s", listen_addr, gai_strerror(gai));
|
|
return 0;
|
|
}
|
|
|
|
for (ai = ai0; ai; ai = ai->ai_next) {
|
|
int sockfd;
|
|
|
|
sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
|
|
if (sockfd < 0)
|
|
continue;
|
|
if (sockfd >= FD_SETSIZE) {
|
|
logerror("Socket descriptor too large");
|
|
close(sockfd);
|
|
continue;
|
|
}
|
|
|
|
#ifdef IPV6_V6ONLY
|
|
if (ai->ai_family == AF_INET6) {
|
|
int on = 1;
|
|
setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
|
|
&on, sizeof(on));
|
|
/* Note: error is not fatal */
|
|
}
|
|
#endif
|
|
|
|
if (set_reuse_addr(sockfd)) {
|
|
logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
|
|
close(sockfd);
|
|
continue;
|
|
}
|
|
|
|
if (bind(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
|
|
logerror("Could not bind to %s: %s",
|
|
ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
|
|
strerror(errno));
|
|
close(sockfd);
|
|
continue; /* not fatal */
|
|
}
|
|
if (listen(sockfd, 5) < 0) {
|
|
logerror("Could not listen to %s: %s",
|
|
ip2str(ai->ai_family, ai->ai_addr, ai->ai_addrlen),
|
|
strerror(errno));
|
|
close(sockfd);
|
|
continue; /* not fatal */
|
|
}
|
|
|
|
flags = fcntl(sockfd, F_GETFD, 0);
|
|
if (flags >= 0)
|
|
fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
|
|
|
|
ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
|
|
socklist->list[socklist->nr++] = sockfd;
|
|
socknum++;
|
|
|
|
if (maxfd < sockfd)
|
|
maxfd = sockfd;
|
|
}
|
|
|
|
freeaddrinfo(ai0);
|
|
|
|
return socknum;
|
|
}
|
|
|
|
#else /* NO_IPV6 */
|
|
|
|
static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
|
|
{
|
|
struct sockaddr_in sin;
|
|
int sockfd;
|
|
long flags;
|
|
|
|
memset(&sin, 0, sizeof sin);
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_port = htons(listen_port);
|
|
|
|
if (listen_addr) {
|
|
/* Well, host better be an IP address here. */
|
|
if (inet_pton(AF_INET, listen_addr, &sin.sin_addr.s_addr) <= 0)
|
|
return 0;
|
|
} else {
|
|
sin.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
}
|
|
|
|
sockfd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (sockfd < 0)
|
|
return 0;
|
|
|
|
if (set_reuse_addr(sockfd)) {
|
|
logerror("Could not set SO_REUSEADDR: %s", strerror(errno));
|
|
close(sockfd);
|
|
return 0;
|
|
}
|
|
|
|
if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
|
|
logerror("Could not listen to %s: %s",
|
|
ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
|
|
strerror(errno));
|
|
close(sockfd);
|
|
return 0;
|
|
}
|
|
|
|
if (listen(sockfd, 5) < 0) {
|
|
logerror("Could not listen to %s: %s",
|
|
ip2str(AF_INET, (struct sockaddr *)&sin, sizeof(sin)),
|
|
strerror(errno));
|
|
close(sockfd);
|
|
return 0;
|
|
}
|
|
|
|
flags = fcntl(sockfd, F_GETFD, 0);
|
|
if (flags >= 0)
|
|
fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
|
|
|
|
ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
|
|
socklist->list[socklist->nr++] = sockfd;
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
static void socksetup(struct string_list *listen_addr, int listen_port, struct socketlist *socklist)
|
|
{
|
|
if (!listen_addr->nr)
|
|
setup_named_sock(NULL, listen_port, socklist);
|
|
else {
|
|
int i, socknum;
|
|
for (i = 0; i < listen_addr->nr; i++) {
|
|
socknum = setup_named_sock(listen_addr->items[i].string,
|
|
listen_port, socklist);
|
|
|
|
if (socknum == 0)
|
|
logerror("unable to allocate any listen sockets for host %s on port %u",
|
|
listen_addr->items[i].string, listen_port);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int service_loop(struct socketlist *socklist)
|
|
{
|
|
struct pollfd *pfd;
|
|
int i;
|
|
|
|
pfd = xcalloc(socklist->nr, sizeof(struct pollfd));
|
|
|
|
for (i = 0; i < socklist->nr; i++) {
|
|
pfd[i].fd = socklist->list[i];
|
|
pfd[i].events = POLLIN;
|
|
}
|
|
|
|
signal(SIGCHLD, child_handler);
|
|
|
|
for (;;) {
|
|
int i;
|
|
|
|
check_dead_children();
|
|
|
|
if (poll(pfd, socklist->nr, -1) < 0) {
|
|
if (errno != EINTR) {
|
|
logerror("Poll failed, resuming: %s",
|
|
strerror(errno));
|
|
sleep(1);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
for (i = 0; i < socklist->nr; i++) {
|
|
if (pfd[i].revents & POLLIN) {
|
|
union {
|
|
struct sockaddr sa;
|
|
struct sockaddr_in sai;
|
|
#ifndef NO_IPV6
|
|
struct sockaddr_in6 sai6;
|
|
#endif
|
|
} ss;
|
|
socklen_t sslen = sizeof(ss);
|
|
int incoming = accept(pfd[i].fd, &ss.sa, &sslen);
|
|
if (incoming < 0) {
|
|
switch (errno) {
|
|
case EAGAIN:
|
|
case EINTR:
|
|
case ECONNABORTED:
|
|
continue;
|
|
default:
|
|
die_errno("accept returned");
|
|
}
|
|
}
|
|
handle(incoming, &ss.sa, sslen);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* if any standard file descriptor is missing open it to /dev/null */
|
|
static void sanitize_stdfds(void)
|
|
{
|
|
int fd = open("/dev/null", O_RDWR, 0);
|
|
while (fd != -1 && fd < 2)
|
|
fd = dup(fd);
|
|
if (fd == -1)
|
|
die_errno("open /dev/null or dup failed");
|
|
if (fd > 2)
|
|
close(fd);
|
|
}
|
|
|
|
#ifdef NO_POSIX_GOODIES
|
|
|
|
struct credentials;
|
|
|
|
static void drop_privileges(struct credentials *cred)
|
|
{
|
|
/* nothing */
|
|
}
|
|
|
|
static void daemonize(void)
|
|
{
|
|
die("--detach not supported on this platform");
|
|
}
|
|
|
|
static struct credentials *prepare_credentials(const char *user_name,
|
|
const char *group_name)
|
|
{
|
|
die("--user not supported on this platform");
|
|
}
|
|
|
|
#else
|
|
|
|
struct credentials {
|
|
struct passwd *pass;
|
|
gid_t gid;
|
|
};
|
|
|
|
static void drop_privileges(struct credentials *cred)
|
|
{
|
|
if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
|
|
setgid (cred->gid) || setuid(cred->pass->pw_uid)))
|
|
die("cannot drop privileges");
|
|
}
|
|
|
|
static struct credentials *prepare_credentials(const char *user_name,
|
|
const char *group_name)
|
|
{
|
|
static struct credentials c;
|
|
|
|
c.pass = getpwnam(user_name);
|
|
if (!c.pass)
|
|
die("user not found - %s", user_name);
|
|
|
|
if (!group_name)
|
|
c.gid = c.pass->pw_gid;
|
|
else {
|
|
struct group *group = getgrnam(group_name);
|
|
if (!group)
|
|
die("group not found - %s", group_name);
|
|
|
|
c.gid = group->gr_gid;
|
|
}
|
|
|
|
return &c;
|
|
}
|
|
|
|
static void daemonize(void)
|
|
{
|
|
switch (fork()) {
|
|
case 0:
|
|
break;
|
|
case -1:
|
|
die_errno("fork failed");
|
|
default:
|
|
exit(0);
|
|
}
|
|
if (setsid() == -1)
|
|
die_errno("setsid failed");
|
|
close(0);
|
|
close(1);
|
|
close(2);
|
|
sanitize_stdfds();
|
|
}
|
|
#endif
|
|
|
|
static void store_pid(const char *path)
|
|
{
|
|
FILE *f = fopen(path, "w");
|
|
if (!f)
|
|
die_errno("cannot open pid file '%s'", path);
|
|
if (fprintf(f, "%"PRIuMAX"\n", (uintmax_t) getpid()) < 0 || fclose(f) != 0)
|
|
die_errno("failed to write pid file '%s'", path);
|
|
}
|
|
|
|
static int serve(struct string_list *listen_addr, int listen_port,
|
|
struct credentials *cred)
|
|
{
|
|
struct socketlist socklist = { NULL, 0, 0 };
|
|
|
|
socksetup(listen_addr, listen_port, &socklist);
|
|
if (socklist.nr == 0)
|
|
die("unable to allocate any listen sockets on port %u",
|
|
listen_port);
|
|
|
|
drop_privileges(cred);
|
|
|
|
return service_loop(&socklist);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int listen_port = 0;
|
|
struct string_list listen_addr = STRING_LIST_INIT_NODUP;
|
|
int serve_mode = 0, inetd_mode = 0;
|
|
const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
|
|
int detach = 0;
|
|
struct credentials *cred = NULL;
|
|
int i;
|
|
|
|
git_extract_argv0_path(argv[0]);
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
char *arg = argv[i];
|
|
|
|
if (!prefixcmp(arg, "--listen=")) {
|
|
string_list_append(&listen_addr, xstrdup_tolower(arg + 9));
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--port=")) {
|
|
char *end;
|
|
unsigned long n;
|
|
n = strtoul(arg+7, &end, 0);
|
|
if (arg[7] && !*end) {
|
|
listen_port = n;
|
|
continue;
|
|
}
|
|
}
|
|
if (!strcmp(arg, "--serve")) {
|
|
serve_mode = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--inetd")) {
|
|
inetd_mode = 1;
|
|
log_syslog = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--verbose")) {
|
|
verbose = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--syslog")) {
|
|
log_syslog = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--export-all")) {
|
|
export_all_trees = 1;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--timeout=")) {
|
|
timeout = atoi(arg+10);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--init-timeout=")) {
|
|
init_timeout = atoi(arg+15);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--max-connections=")) {
|
|
max_connections = atoi(arg+18);
|
|
if (max_connections < 0)
|
|
max_connections = 0; /* unlimited */
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--strict-paths")) {
|
|
strict_paths = 1;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--base-path=")) {
|
|
base_path = arg+12;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--base-path-relaxed")) {
|
|
base_path_relaxed = 1;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--interpolated-path=")) {
|
|
interpolated_path = arg+20;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--reuseaddr")) {
|
|
reuseaddr = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--user-path")) {
|
|
user_path = "";
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--user-path=")) {
|
|
user_path = arg + 12;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--pid-file=")) {
|
|
pid_file = arg + 11;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--detach")) {
|
|
detach = 1;
|
|
log_syslog = 1;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--user=")) {
|
|
user_name = arg + 7;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--group=")) {
|
|
group_name = arg + 8;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--enable=")) {
|
|
enable_service(arg + 9, 1);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--disable=")) {
|
|
enable_service(arg + 10, 0);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--allow-override=")) {
|
|
make_service_overridable(arg + 17, 1);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--forbid-override=")) {
|
|
make_service_overridable(arg + 18, 0);
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--informative-errors")) {
|
|
informative_errors = 1;
|
|
continue;
|
|
}
|
|
if (!prefixcmp(arg, "--no-informative-errors")) {
|
|
informative_errors = 0;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--")) {
|
|
ok_paths = &argv[i+1];
|
|
break;
|
|
} else if (arg[0] != '-') {
|
|
ok_paths = &argv[i];
|
|
break;
|
|
}
|
|
|
|
usage(daemon_usage);
|
|
}
|
|
|
|
if (log_syslog) {
|
|
openlog("git-daemon", LOG_PID, LOG_DAEMON);
|
|
set_die_routine(daemon_die);
|
|
} else
|
|
/* avoid splitting a message in the middle */
|
|
setvbuf(stderr, NULL, _IOFBF, 4096);
|
|
|
|
if (inetd_mode && (detach || group_name || user_name))
|
|
die("--detach, --user and --group are incompatible with --inetd");
|
|
|
|
if (inetd_mode && (listen_port || (listen_addr.nr > 0)))
|
|
die("--listen= and --port= are incompatible with --inetd");
|
|
else if (listen_port == 0)
|
|
listen_port = DEFAULT_GIT_PORT;
|
|
|
|
if (group_name && !user_name)
|
|
die("--group supplied without --user");
|
|
|
|
if (user_name)
|
|
cred = prepare_credentials(user_name, group_name);
|
|
|
|
if (strict_paths && (!ok_paths || !*ok_paths))
|
|
die("option --strict-paths requires a whitelist");
|
|
|
|
if (base_path && !is_directory(base_path))
|
|
die("base-path '%s' does not exist or is not a directory",
|
|
base_path);
|
|
|
|
if (inetd_mode) {
|
|
if (!freopen("/dev/null", "w", stderr))
|
|
die_errno("failed to redirect stderr to /dev/null");
|
|
}
|
|
|
|
if (inetd_mode || serve_mode)
|
|
return execute();
|
|
|
|
if (detach) {
|
|
daemonize();
|
|
loginfo("Ready to rumble");
|
|
}
|
|
else
|
|
sanitize_stdfds();
|
|
|
|
if (pid_file)
|
|
store_pid(pid_file);
|
|
|
|
/* prepare argv for serving-processes */
|
|
cld_argv = xmalloc(sizeof (char *) * (argc + 2));
|
|
cld_argv[0] = argv[0]; /* git-daemon */
|
|
cld_argv[1] = "--serve";
|
|
for (i = 1; i < argc; ++i)
|
|
cld_argv[i+1] = argv[i];
|
|
cld_argv[argc+1] = NULL;
|
|
|
|
return serve(&listen_addr, listen_port, cred);
|
|
}
|