mirror of
https://github.com/git/git
synced 2024-10-30 14:03:28 +00:00
6f1e2d5279
Avoid the overhead of passing context to a callback function of strbuf_expand() by using strbuf_expand_step() in a loop instead. It requires explicit handling of %% and unrecognized placeholders, but is simpler, more direct and avoids void pointers. Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1460 lines
34 KiB
C
1460 lines
34 KiB
C
#include "git-compat-util.h"
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#include "abspath.h"
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#include "alloc.h"
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#include "config.h"
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#include "environment.h"
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#include "path.h"
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#include "pkt-line.h"
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#include "protocol.h"
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#include "run-command.h"
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#include "setup.h"
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#include "strbuf.h"
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#include "string-list.h"
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#include "wrapper.h"
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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 enum log_destination {
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LOG_DESTINATION_UNSET = -1,
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LOG_DESTINATION_NONE = 0,
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LOG_DESTINATION_STDERR = 1,
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LOG_DESTINATION_SYSLOG = 2,
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} log_destination = LOG_DESTINATION_UNSET;
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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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" [--access-hook=<path>]\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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" [--log-destination=(stderr|syslog|none)]\n"
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" [<directory>...]";
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/* List of acceptable pathname prefixes */
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static const 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 const char *base_path;
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static const char *interpolated_path;
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static int base_path_relaxed;
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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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struct hostinfo {
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struct strbuf hostname;
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struct strbuf canon_hostname;
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struct strbuf ip_address;
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struct strbuf tcp_port;
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unsigned int hostname_lookup_done:1;
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unsigned int saw_extended_args:1;
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};
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#define HOSTINFO_INIT { \
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.hostname = STRBUF_INIT, \
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.canon_hostname = STRBUF_INIT, \
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.ip_address = STRBUF_INIT, \
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.tcp_port = STRBUF_INIT, \
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}
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static void lookup_hostname(struct hostinfo *hi);
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static const char *get_canon_hostname(struct hostinfo *hi)
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{
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lookup_hostname(hi);
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return hi->canon_hostname.buf;
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}
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static const char *get_ip_address(struct hostinfo *hi)
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{
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lookup_hostname(hi);
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return hi->ip_address.buf;
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}
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static void logreport(int priority, const char *err, va_list params)
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{
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switch (log_destination) {
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case LOG_DESTINATION_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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break;
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}
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case LOG_DESTINATION_STDERR:
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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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break;
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case LOG_DESTINATION_NONE:
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break;
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case LOG_DESTINATION_UNSET:
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BUG("log destination not initialized correctly");
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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(const char *directory, struct hostinfo *hi)
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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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size_t rlen;
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const char *path;
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const 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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const 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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rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s",
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namlen, dir, user_path, restlen, slash);
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if (rlen >= sizeof(rpath)) {
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logerror("user-path too large: %s", rpath);
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return NULL;
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}
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dir = rpath;
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}
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}
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else if (interpolated_path && hi->saw_extended_args) {
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struct strbuf expanded_path = STRBUF_INIT;
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const char *format = interpolated_path;
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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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while (strbuf_expand_step(&expanded_path, &format)) {
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if (skip_prefix(format, "%", &format))
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strbuf_addch(&expanded_path, '%');
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else if (skip_prefix(format, "H", &format))
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strbuf_addbuf(&expanded_path, &hi->hostname);
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else if (skip_prefix(format, "CH", &format))
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strbuf_addstr(&expanded_path,
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get_canon_hostname(hi));
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else if (skip_prefix(format, "IP", &format))
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strbuf_addstr(&expanded_path,
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get_ip_address(hi));
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else if (skip_prefix(format, "P", &format))
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strbuf_addbuf(&expanded_path, &hi->tcp_port);
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else if (skip_prefix(format, "D", &format))
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strbuf_addstr(&expanded_path, directory);
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else
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strbuf_addch(&expanded_path, '%');
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}
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rlen = strlcpy(interp_path, expanded_path.buf,
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sizeof(interp_path));
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strbuf_release(&expanded_path);
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if (rlen >= sizeof(interp_path)) {
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logerror("interpolated path too large: %s",
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interp_path);
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return NULL;
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}
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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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rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir);
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if (rlen >= sizeof(rpath)) {
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logerror("base-path too large: %s", rpath);
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return NULL;
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}
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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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const 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 include /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 directory list", path);
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return NULL; /* Fallthrough. Deny by default */
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}
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typedef int (*daemon_service_fn)(const struct strvec *env);
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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 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_fmt(1, "ERR %s: %s", msg, dir);
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return -1;
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}
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static const char *access_hook;
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static int run_access_hook(struct daemon_service *service, const char *dir,
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const char *path, struct hostinfo *hi)
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{
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struct child_process child = CHILD_PROCESS_INIT;
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struct strbuf buf = STRBUF_INIT;
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char *eol;
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int seen_errors = 0;
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strvec_push(&child.args, access_hook);
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strvec_push(&child.args, service->name);
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strvec_push(&child.args, path);
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strvec_push(&child.args, hi->hostname.buf);
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strvec_push(&child.args, get_canon_hostname(hi));
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strvec_push(&child.args, get_ip_address(hi));
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strvec_push(&child.args, hi->tcp_port.buf);
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child.use_shell = 1;
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child.no_stdin = 1;
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child.no_stderr = 1;
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child.out = -1;
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if (start_command(&child)) {
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logerror("daemon access hook '%s' failed to start",
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access_hook);
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goto error_return;
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}
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if (strbuf_read(&buf, child.out, 0) < 0) {
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logerror("failed to read from pipe to daemon access hook '%s'",
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access_hook);
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strbuf_reset(&buf);
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seen_errors = 1;
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}
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if (close(child.out) < 0) {
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logerror("failed to close pipe to daemon access hook '%s'",
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access_hook);
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seen_errors = 1;
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}
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if (finish_command(&child))
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seen_errors = 1;
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if (!seen_errors) {
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strbuf_release(&buf);
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return 0;
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}
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error_return:
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strbuf_ltrim(&buf);
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if (!buf.len)
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strbuf_addstr(&buf, "service rejected");
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eol = strchr(buf.buf, '\n');
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if (eol)
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*eol = '\0';
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errno = EACCES;
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daemon_error(dir, buf.buf);
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strbuf_release(&buf);
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return -1;
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}
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static int run_service(const char *dir, struct daemon_service *service,
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struct hostinfo *hi, const struct strvec *env)
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{
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const char *path;
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int enabled = service->enabled;
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struct strbuf var = STRBUF_INIT;
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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, hi)))
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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 checks for included directories.
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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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strbuf_addf(&var, "daemon.%s", service->config_name);
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git_config_get_bool(var.buf, &enabled);
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strbuf_release(&var);
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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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* Optionally, a hook can choose to deny access to the
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* repository depending on the phase of the moon.
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*/
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if (access_hook && run_access_hook(service, dir, path, hi))
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return -1;
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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(env);
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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) {
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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_lf(&line, fp) != 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(struct child_process *cld)
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{
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strvec_push(&cld->args, ".");
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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(const struct strvec *env)
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{
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struct child_process cld = CHILD_PROCESS_INIT;
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strvec_pushl(&cld.args, "upload-pack", "--strict", NULL);
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strvec_pushf(&cld.args, "--timeout=%u", timeout);
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strvec_pushv(&cld.env, env->v);
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return run_service_command(&cld);
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}
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static int upload_archive(const struct strvec *env)
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{
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struct child_process cld = CHILD_PROCESS_INIT;
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strvec_push(&cld.args, "upload-archive");
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strvec_pushv(&cld.env, env->v);
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return run_service_command(&cld);
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}
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static int receive_pack(const struct strvec *env)
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{
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struct child_process cld = CHILD_PROCESS_INIT;
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strvec_push(&cld.args, "receive-pack");
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strvec_pushv(&cld.env, env->v);
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return run_service_command(&cld);
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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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|
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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)) {
|
|
daemon_service[i].overridable = ena;
|
|
return;
|
|
}
|
|
}
|
|
die("No such service %s", name);
|
|
}
|
|
|
|
static void parse_host_and_port(char *hostport, char **host,
|
|
char **port)
|
|
{
|
|
if (*hostport == '[') {
|
|
char *end;
|
|
|
|
end = strchr(hostport, ']');
|
|
if (!end)
|
|
die("Invalid request ('[' without ']')");
|
|
*end = '\0';
|
|
*host = hostport + 1;
|
|
if (!end[1])
|
|
*port = NULL;
|
|
else if (end[1] == ':')
|
|
*port = end + 2;
|
|
else
|
|
die("Garbage after end of host part");
|
|
} else {
|
|
*host = hostport;
|
|
*port = strrchr(hostport, ':');
|
|
if (*port) {
|
|
**port = '\0';
|
|
++*port;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Sanitize a string from the client so that it's OK to be inserted into a
|
|
* filesystem path. Specifically, we disallow directory separators, runs
|
|
* of "..", and trailing and leading dots, which means that the client
|
|
* cannot escape our base path via ".." traversal.
|
|
*/
|
|
static void sanitize_client(struct strbuf *out, const char *in)
|
|
{
|
|
for (; *in; in++) {
|
|
if (is_dir_sep(*in))
|
|
continue;
|
|
if (*in == '.' && (!out->len || out->buf[out->len - 1] == '.'))
|
|
continue;
|
|
strbuf_addch(out, *in);
|
|
}
|
|
|
|
while (out->len && out->buf[out->len - 1] == '.')
|
|
strbuf_setlen(out, out->len - 1);
|
|
}
|
|
|
|
/*
|
|
* Like sanitize_client, but we also perform any canonicalization
|
|
* to make life easier on the admin.
|
|
*/
|
|
static void canonicalize_client(struct strbuf *out, const char *in)
|
|
{
|
|
sanitize_client(out, in);
|
|
strbuf_tolower(out);
|
|
}
|
|
|
|
/*
|
|
* Read the host as supplied by the client connection.
|
|
*
|
|
* Returns a pointer to the character after the NUL byte terminating the host
|
|
* argument, or 'extra_args' if there is no host argument.
|
|
*/
|
|
static char *parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen)
|
|
{
|
|
char *val;
|
|
int vallen;
|
|
char *end = extra_args + buflen;
|
|
|
|
if (extra_args < end && *extra_args) {
|
|
hi->saw_extended_args = 1;
|
|
if (strncasecmp("host=", extra_args, 5) == 0) {
|
|
val = extra_args + 5;
|
|
vallen = strlen(val) + 1;
|
|
loginfo("Extended attribute \"host\": %s", val);
|
|
if (*val) {
|
|
/* Split <host>:<port> at colon. */
|
|
char *host;
|
|
char *port;
|
|
parse_host_and_port(val, &host, &port);
|
|
if (port)
|
|
sanitize_client(&hi->tcp_port, port);
|
|
canonicalize_client(&hi->hostname, host);
|
|
hi->hostname_lookup_done = 0;
|
|
}
|
|
|
|
/* On to the next one */
|
|
extra_args = val + vallen;
|
|
}
|
|
if (extra_args < end && *extra_args)
|
|
die("Invalid request");
|
|
}
|
|
|
|
return extra_args;
|
|
}
|
|
|
|
static void parse_extra_args(struct hostinfo *hi, struct strvec *env,
|
|
char *extra_args, int buflen)
|
|
{
|
|
const char *end = extra_args + buflen;
|
|
struct strbuf git_protocol = STRBUF_INIT;
|
|
|
|
/* First look for the host argument */
|
|
extra_args = parse_host_arg(hi, extra_args, buflen);
|
|
|
|
/* Look for additional arguments places after a second NUL byte */
|
|
for (; extra_args < end; extra_args += strlen(extra_args) + 1) {
|
|
const char *arg = extra_args;
|
|
|
|
/*
|
|
* Parse the extra arguments, adding most to 'git_protocol'
|
|
* which will be used to set the 'GIT_PROTOCOL' envvar in the
|
|
* service that will be run.
|
|
*
|
|
* If there ends up being a particular arg in the future that
|
|
* git-daemon needs to parse specifically (like the 'host' arg)
|
|
* then it can be parsed here and not added to 'git_protocol'.
|
|
*/
|
|
if (*arg) {
|
|
if (git_protocol.len > 0)
|
|
strbuf_addch(&git_protocol, ':');
|
|
strbuf_addstr(&git_protocol, arg);
|
|
}
|
|
}
|
|
|
|
if (git_protocol.len > 0) {
|
|
loginfo("Extended attribute \"protocol\": %s", git_protocol.buf);
|
|
strvec_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s",
|
|
git_protocol.buf);
|
|
}
|
|
strbuf_release(&git_protocol);
|
|
}
|
|
|
|
/*
|
|
* Locate canonical hostname and its IP address.
|
|
*/
|
|
static void lookup_hostname(struct hostinfo *hi)
|
|
{
|
|
if (!hi->hostname_lookup_done && hi->hostname.len) {
|
|
#ifndef NO_IPV6
|
|
struct addrinfo hints;
|
|
struct addrinfo *ai;
|
|
int gai;
|
|
static char addrbuf[HOST_NAME_MAX + 1];
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_flags = AI_CANONNAME;
|
|
|
|
gai = getaddrinfo(hi->hostname.buf, NULL, &hints, &ai);
|
|
if (!gai) {
|
|
struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
|
|
|
|
inet_ntop(AF_INET, &sin_addr->sin_addr,
|
|
addrbuf, sizeof(addrbuf));
|
|
strbuf_addstr(&hi->ip_address, addrbuf);
|
|
|
|
if (ai->ai_canonname)
|
|
sanitize_client(&hi->canon_hostname,
|
|
ai->ai_canonname);
|
|
else
|
|
strbuf_addbuf(&hi->canon_hostname,
|
|
&hi->ip_address);
|
|
|
|
freeaddrinfo(ai);
|
|
}
|
|
#else
|
|
struct hostent *hent;
|
|
struct sockaddr_in sa;
|
|
char **ap;
|
|
static char addrbuf[HOST_NAME_MAX + 1];
|
|
|
|
hent = gethostbyname(hi->hostname.buf);
|
|
if (hent) {
|
|
ap = hent->h_addr_list;
|
|
memset(&sa, 0, sizeof sa);
|
|
sa.sin_family = hent->h_addrtype;
|
|
sa.sin_port = htons(0);
|
|
memcpy(&sa.sin_addr, *ap, hent->h_length);
|
|
|
|
inet_ntop(hent->h_addrtype, &sa.sin_addr,
|
|
addrbuf, sizeof(addrbuf));
|
|
|
|
sanitize_client(&hi->canon_hostname, hent->h_name);
|
|
strbuf_addstr(&hi->ip_address, addrbuf);
|
|
}
|
|
#endif
|
|
hi->hostname_lookup_done = 1;
|
|
}
|
|
}
|
|
|
|
static void hostinfo_clear(struct hostinfo *hi)
|
|
{
|
|
strbuf_release(&hi->hostname);
|
|
strbuf_release(&hi->canon_hostname);
|
|
strbuf_release(&hi->ip_address);
|
|
strbuf_release(&hi->tcp_port);
|
|
}
|
|
|
|
static void set_keep_alive(int sockfd)
|
|
{
|
|
int ka = 1;
|
|
|
|
if (setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &ka, sizeof(ka)) < 0) {
|
|
if (errno != ENOTSOCK)
|
|
logerror("unable to set SO_KEEPALIVE on socket: %s",
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
static int execute(void)
|
|
{
|
|
char *line = packet_buffer;
|
|
int pktlen, len, i;
|
|
char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
|
|
struct hostinfo hi = HOSTINFO_INIT;
|
|
struct strvec env = STRVEC_INIT;
|
|
|
|
if (addr)
|
|
loginfo("Connection from %s:%s", addr, port);
|
|
|
|
set_keep_alive(0);
|
|
alarm(init_timeout ? init_timeout : timeout);
|
|
pktlen = packet_read(0, packet_buffer, sizeof(packet_buffer), 0);
|
|
alarm(0);
|
|
|
|
len = strlen(line);
|
|
if (len && line[len-1] == '\n')
|
|
line[len-1] = 0;
|
|
|
|
/* parse additional args hidden behind a NUL byte */
|
|
if (len != pktlen)
|
|
parse_extra_args(&hi, &env, line + len + 1, pktlen - len - 1);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
|
|
struct daemon_service *s = &(daemon_service[i]);
|
|
const char *arg;
|
|
|
|
if (skip_prefix(line, "git-", &arg) &&
|
|
skip_prefix(arg, s->name, &arg) &&
|
|
*arg++ == ' ') {
|
|
/*
|
|
* Note: The directory here is probably context sensitive,
|
|
* and might depend on the actual service being performed.
|
|
*/
|
|
int rc = run_service(arg, s, &hi, &env);
|
|
hostinfo_clear(&hi);
|
|
strvec_clear(&env);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
hostinfo_clear(&hi);
|
|
strvec_clear(&env);
|
|
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;
|
|
|
|
CALLOC_ARRAY(newborn, 1);
|
|
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--;
|
|
child_process_clear(&blanket->cld);
|
|
free(blanket);
|
|
} else
|
|
cradle = &blanket->next;
|
|
}
|
|
|
|
static struct strvec cld_argv = STRVEC_INIT;
|
|
static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
|
|
{
|
|
struct child_process cld = CHILD_PROCESS_INIT;
|
|
|
|
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) {
|
|
char buf[128] = "";
|
|
struct sockaddr_in *sin_addr = (void *) addr;
|
|
inet_ntop(addr->sa_family, &sin_addr->sin_addr, buf, sizeof(buf));
|
|
strvec_pushf(&cld.env, "REMOTE_ADDR=%s", buf);
|
|
strvec_pushf(&cld.env, "REMOTE_PORT=%d",
|
|
ntohs(sin_addr->sin_port));
|
|
#ifndef NO_IPV6
|
|
} else if (addr->sa_family == AF_INET6) {
|
|
char buf[128] = "";
|
|
struct sockaddr_in6 *sin6_addr = (void *) addr;
|
|
inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(buf));
|
|
strvec_pushf(&cld.env, "REMOTE_ADDR=[%s]", buf);
|
|
strvec_pushf(&cld.env, "REMOTE_PORT=%d",
|
|
ntohs(sin6_addr->sin6_port));
|
|
#endif
|
|
}
|
|
|
|
strvec_pushv(&cld.args, cld_argv.v);
|
|
cld.in = incoming;
|
|
cld.out = dup(incoming);
|
|
|
|
if (start_command(&cld))
|
|
logerror("unable to fork");
|
|
else
|
|
add_child(&cld, addr, addrlen);
|
|
}
|
|
|
|
static void child_handler(int signo UNUSED)
|
|
{
|
|
/*
|
|
* 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:
|
|
xsnprintf(ip, sizeof(ip), "<unknown>");
|
|
}
|
|
return ip;
|
|
}
|
|
|
|
#ifndef NO_IPV6
|
|
|
|
static int setup_named_sock(char *listen_addr, int listen_port, struct socketlist *socklist)
|
|
{
|
|
int socknum = 0;
|
|
char pbuf[NI_MAXSERV];
|
|
struct addrinfo hints, *ai0, *ai;
|
|
int gai;
|
|
long flags;
|
|
|
|
xsnprintf(pbuf, sizeof(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;
|
|
}
|
|
|
|
set_keep_alive(sockfd);
|
|
|
|
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++;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
set_keep_alive(sockfd);
|
|
|
|
if ( bind(sockfd, (struct sockaddr *)&sin, sizeof sin) < 0 ) {
|
|
logerror("Could not bind 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;
|
|
|
|
CALLOC_ARRAY(pfd, socklist->nr);
|
|
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef NO_POSIX_GOODIES
|
|
|
|
struct credentials;
|
|
|
|
static void drop_privileges(struct credentials *cred)
|
|
{
|
|
/* nothing */
|
|
}
|
|
|
|
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;
|
|
}
|
|
#endif
|
|
|
|
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);
|
|
|
|
loginfo("Ready to rumble");
|
|
|
|
return service_loop(&socklist);
|
|
}
|
|
|
|
int cmd_main(int argc, const 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;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
const char *arg = argv[i];
|
|
const char *v;
|
|
|
|
if (skip_prefix(arg, "--listen=", &v)) {
|
|
string_list_append(&listen_addr, xstrdup_tolower(v));
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--port=", &v)) {
|
|
char *end;
|
|
unsigned long n;
|
|
n = strtoul(v, &end, 0);
|
|
if (*v && !*end) {
|
|
listen_port = n;
|
|
continue;
|
|
}
|
|
}
|
|
if (!strcmp(arg, "--serve")) {
|
|
serve_mode = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--inetd")) {
|
|
inetd_mode = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--verbose")) {
|
|
verbose = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--syslog")) {
|
|
log_destination = LOG_DESTINATION_SYSLOG;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--log-destination=", &v)) {
|
|
if (!strcmp(v, "syslog")) {
|
|
log_destination = LOG_DESTINATION_SYSLOG;
|
|
continue;
|
|
} else if (!strcmp(v, "stderr")) {
|
|
log_destination = LOG_DESTINATION_STDERR;
|
|
continue;
|
|
} else if (!strcmp(v, "none")) {
|
|
log_destination = LOG_DESTINATION_NONE;
|
|
continue;
|
|
} else
|
|
die("unknown log destination '%s'", v);
|
|
}
|
|
if (!strcmp(arg, "--export-all")) {
|
|
export_all_trees = 1;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--access-hook=", &v)) {
|
|
access_hook = v;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--timeout=", &v)) {
|
|
timeout = atoi(v);
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--init-timeout=", &v)) {
|
|
init_timeout = atoi(v);
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--max-connections=", &v)) {
|
|
max_connections = atoi(v);
|
|
if (max_connections < 0)
|
|
max_connections = 0; /* unlimited */
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--strict-paths")) {
|
|
strict_paths = 1;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--base-path=", &v)) {
|
|
base_path = v;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--base-path-relaxed")) {
|
|
base_path_relaxed = 1;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--interpolated-path=", &v)) {
|
|
interpolated_path = v;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--reuseaddr")) {
|
|
reuseaddr = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--user-path")) {
|
|
user_path = "";
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--user-path=", &v)) {
|
|
user_path = v;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--pid-file=", &v)) {
|
|
pid_file = v;
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--detach")) {
|
|
detach = 1;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--user=", &v)) {
|
|
user_name = v;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--group=", &v)) {
|
|
group_name = v;
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--enable=", &v)) {
|
|
enable_service(v, 1);
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--disable=", &v)) {
|
|
enable_service(v, 0);
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--allow-override=", &v)) {
|
|
make_service_overridable(v, 1);
|
|
continue;
|
|
}
|
|
if (skip_prefix(arg, "--forbid-override=", &v)) {
|
|
make_service_overridable(v, 0);
|
|
continue;
|
|
}
|
|
if (!strcmp(arg, "--informative-errors")) {
|
|
informative_errors = 1;
|
|
continue;
|
|
}
|
|
if (!strcmp(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_destination == LOG_DESTINATION_UNSET) {
|
|
if (inetd_mode || detach)
|
|
log_destination = LOG_DESTINATION_SYSLOG;
|
|
else
|
|
log_destination = LOG_DESTINATION_STDERR;
|
|
}
|
|
|
|
if (log_destination == LOG_DESTINATION_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 '<directory>' arguments");
|
|
|
|
if (base_path && !is_directory(base_path))
|
|
die("base-path '%s' does not exist or is not a directory",
|
|
base_path);
|
|
|
|
if (log_destination != LOG_DESTINATION_STDERR) {
|
|
if (!freopen("/dev/null", "w", stderr))
|
|
die_errno("failed to redirect stderr to /dev/null");
|
|
}
|
|
|
|
if (inetd_mode || serve_mode)
|
|
return execute();
|
|
|
|
if (detach) {
|
|
if (daemonize())
|
|
die("--detach not supported on this platform");
|
|
}
|
|
|
|
if (pid_file)
|
|
write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
|
|
|
|
/* prepare argv for serving-processes */
|
|
strvec_push(&cld_argv, argv[0]); /* git-daemon */
|
|
strvec_push(&cld_argv, "--serve");
|
|
for (i = 1; i < argc; ++i)
|
|
strvec_push(&cld_argv, argv[i]);
|
|
|
|
return serve(&listen_addr, listen_port, cred);
|
|
}
|