-#include <signal.h>
-#include <sys/wait.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <sys/poll.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <syslog.h>
-#include <pwd.h>
-#include <grp.h>
-#include "pkt-line.h"
#include "cache.h"
+#include "pkt-line.h"
#include "exec_cmd.h"
+#include "interpolate.h"
+
+#include <syslog.h>
+
+#ifndef HOST_NAME_MAX
+#define HOST_NAME_MAX 256
+#endif
static int log_syslog;
static int verbose;
static int reuseaddr;
static const char daemon_usage[] =
-"git-daemon [--verbose] [--syslog] [--inetd | --port=n] [--export-all]\n"
+"git-daemon [--verbose] [--syslog] [--export-all]\n"
" [--timeout=n] [--init-timeout=n] [--strict-paths]\n"
-" [--base-path=path] [--user-path | --user-path=path]\n"
+" [--base-path=path] [--base-path-relaxed]\n"
+" [--user-path | --user-path=path]\n"
+" [--interpolated-path=path]\n"
" [--reuseaddr] [--detach] [--pid-file=file]\n"
" [--[enable|disable|allow-override|forbid-override]=service]\n"
-" [--user=user [[--group=group]] [directory...]";
+" [--inetd | [--listen=host_or_ipaddr] [--port=n]\n"
+" [--user=user [--group=group]]\n"
+" [directory...]";
/* List of acceptable pathname prefixes */
static char **ok_paths;
/* Take all paths relative to this one if non-NULL */
static char *base_path;
+static char *interpolated_path;
+static int base_path_relaxed;
+
+/* Flag indicating client sent extra args. */
+static int saw_extended_args;
/* If defined, ~user notation is allowed and the string is inserted
* after ~user/. E.g. a request to git://host/~alice/frotz would
static unsigned int timeout;
static unsigned int init_timeout;
+/*
+ * Static table for now. Ugh.
+ * Feel free to make dynamic as needed.
+ */
+#define INTERP_SLOT_HOST (0)
+#define INTERP_SLOT_CANON_HOST (1)
+#define INTERP_SLOT_IP (2)
+#define INTERP_SLOT_PORT (3)
+#define INTERP_SLOT_DIR (4)
+#define INTERP_SLOT_PERCENT (5)
+
+static struct interp interp_table[] = {
+ { "%H", 0},
+ { "%CH", 0},
+ { "%IP", 0},
+ { "%P", 0},
+ { "%D", 0},
+ { "%%", 0},
+};
+
+
static void logreport(int priority, const char *err, va_list params)
{
/* We should do a single write so that it is atomic and output
buf[buflen++] = '\n';
buf[buflen] = '\0';
- write(2, buf, buflen);
+ write_in_full(2, buf, buflen);
}
static void logerror(const char *err, ...)
{
int sl, ndot;
- /*
+ /*
* This resurrects the belts and suspenders paranoia check by HPA
* done in <435560F7.4080006@zytor.com> thread, now enter_repo()
* does not do getcwd() based path canonicalizations.
}
}
-static char *path_ok(char *dir)
+static char *path_ok(struct interp *itable)
{
static char rpath[PATH_MAX];
+ static char interp_path[PATH_MAX];
+ int retried_path = 0;
char *path;
+ char *dir;
+
+ dir = itable[INTERP_SLOT_DIR].value;
if (avoid_alias(dir)) {
logerror("'%s': aliased", dir);
dir = rpath;
}
}
+ else if (interpolated_path && saw_extended_args) {
+ if (*dir != '/') {
+ /* Allow only absolute */
+ logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
+ return NULL;
+ }
+
+ interpolate(interp_path, PATH_MAX, interpolated_path,
+ interp_table, ARRAY_SIZE(interp_table));
+ loginfo("Interpolated dir '%s'", interp_path);
+
+ dir = interp_path;
+ }
else if (base_path) {
if (*dir != '/') {
/* Allow only absolute */
logerror("'%s': Non-absolute path denied (base-path active)", dir);
return NULL;
}
- else {
- snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
- dir = rpath;
- }
+ snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
+ dir = rpath;
}
- path = enter_repo(dir, strict_paths);
+ do {
+ path = enter_repo(dir, strict_paths);
+ if (path)
+ break;
+
+ /*
+ * if we fail and base_path_relaxed is enabled, try without
+ * prefixing the base path
+ */
+ if (base_path && base_path_relaxed && !retried_path) {
+ dir = itable[INTERP_SLOT_DIR].value;
+ retried_path = 1;
+ continue;
+ }
+ break;
+ } while (1);
if (!path) {
logerror("'%s': unable to chdir or not a git archive", dir);
int pathlen = strlen(path);
/* The validation is done on the paths after enter_repo
- * appends optional {.git,.git/.git} and friends, but
+ * appends optional {.git,.git/.git} and friends, but
* it does not use getcwd(). So if your /pub is
* a symlink to /mnt/pub, you can whitelist /pub and
* do not have to say /mnt/pub.
static int git_daemon_config(const char *var, const char *value)
{
- if (!strncmp(var, "daemon.", 7) &&
+ if (!prefixcmp(var, "daemon.") &&
!strcmp(var + 7, service_looking_at->config_name)) {
service_enabled = git_config_bool(var, value);
return 0;
return 0;
}
-static int run_service(char *dir, struct daemon_service *service)
+static int run_service(struct interp *itable, struct daemon_service *service)
{
const char *path;
int enabled = service->enabled;
- loginfo("Request %s for '%s'", service->name, dir);
+ loginfo("Request %s for '%s'",
+ service->name,
+ itable[INTERP_SLOT_DIR].value);
if (!enabled && !service->overridable) {
logerror("'%s': service not enabled.", service->name);
return -1;
}
- if (!(path = path_ok(dir)))
+ if (!(path = path_ok(itable)))
return -1;
/*
return -1;
}
+static int receive_pack(void)
+{
+ execl_git_cmd("receive-pack", ".", NULL);
+ return -1;
+}
+
static struct daemon_service daemon_service[] = {
{ "upload-archive", "uploadarch", upload_archive, 0, 1 },
{ "upload-pack", "uploadpack", upload_pack, 1, 1 },
+ { "receive-pack", "receivepack", receive_pack, 0, 1 },
};
static void enable_service(const char *name, int ena) {
die("No such service %s", name);
}
+/*
+ * Separate the "extra args" information as supplied by the client connection.
+ * Any resulting data is squirreled away in the given interpolation table.
+ */
+static void parse_extra_args(struct interp *table, char *extra_args, int buflen)
+{
+ char *val;
+ int vallen;
+ char *end = extra_args + buflen;
+
+ while (extra_args < end && *extra_args) {
+ saw_extended_args = 1;
+ if (strncasecmp("host=", extra_args, 5) == 0) {
+ val = extra_args + 5;
+ vallen = strlen(val) + 1;
+ if (*val) {
+ /* Split <host>:<port> at colon. */
+ char *host = val;
+ char *port = strrchr(host, ':');
+ if (port) {
+ *port = 0;
+ port++;
+ interp_set_entry(table, INTERP_SLOT_PORT, port);
+ }
+ interp_set_entry(table, INTERP_SLOT_HOST, host);
+ }
+
+ /* On to the next one */
+ extra_args = val + vallen;
+ }
+ }
+}
+
+static void fill_in_extra_table_entries(struct interp *itable)
+{
+ char *hp;
+
+ /*
+ * Replace literal host with lowercase-ized hostname.
+ */
+ hp = interp_table[INTERP_SLOT_HOST].value;
+ if (!hp)
+ return;
+ for ( ; *hp; hp++)
+ *hp = tolower(*hp);
+
+ /*
+ * Locate canonical hostname and its IP address.
+ */
+#ifndef NO_IPV6
+ {
+ struct addrinfo hints;
+ struct addrinfo *ai, *ai0;
+ int gai;
+ static char addrbuf[HOST_NAME_MAX + 1];
+
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_flags = AI_CANONNAME;
+
+ gai = getaddrinfo(interp_table[INTERP_SLOT_HOST].value, 0, &hints, &ai0);
+ if (!gai) {
+ for (ai = ai0; ai; ai = ai->ai_next) {
+ struct sockaddr_in *sin_addr = (void *)ai->ai_addr;
+
+ inet_ntop(AF_INET, &sin_addr->sin_addr,
+ addrbuf, sizeof(addrbuf));
+ interp_set_entry(interp_table,
+ INTERP_SLOT_CANON_HOST, ai->ai_canonname);
+ interp_set_entry(interp_table,
+ INTERP_SLOT_IP, addrbuf);
+ break;
+ }
+ freeaddrinfo(ai0);
+ }
+ }
+#else
+ {
+ struct hostent *hent;
+ struct sockaddr_in sa;
+ char **ap;
+ static char addrbuf[HOST_NAME_MAX + 1];
+
+ hent = gethostbyname(interp_table[INTERP_SLOT_HOST].value);
+
+ 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));
+
+ interp_set_entry(interp_table, INTERP_SLOT_CANON_HOST, hent->h_name);
+ interp_set_entry(interp_table, INTERP_SLOT_IP, addrbuf);
+ }
+#endif
+}
+
+
static int execute(struct sockaddr *addr)
{
static char line[1000];
loginfo("Extended attributes (%d bytes) exist <%.*s>",
(int) pktlen - len,
(int) pktlen - len, line + len + 1);
- if (len && line[len-1] == '\n')
+ if (len && line[len-1] == '\n') {
line[--len] = 0;
+ pktlen--;
+ }
+
+ /*
+ * Initialize the path interpolation table for this connection.
+ */
+ interp_clear_table(interp_table, ARRAY_SIZE(interp_table));
+ interp_set_entry(interp_table, INTERP_SLOT_PERCENT, "%");
+
+ if (len != pktlen) {
+ parse_extra_args(interp_table, line + len + 1, pktlen - len - 1);
+ fill_in_extra_table_entries(interp_table);
+ }
for (i = 0; i < ARRAY_SIZE(daemon_service); i++) {
struct daemon_service *s = &(daemon_service[i]);
int namelen = strlen(s->name);
- if (!strncmp("git-", line, 4) &&
+ if (!prefixcmp(line, "git-") &&
!strncmp(s->name, line + 4, namelen) &&
- line[namelen + 4] == ' ')
- return run_service(line + namelen + 5, s);
+ line[namelen + 4] == ' ') {
+ /*
+ * Note: The directory here is probably context sensitive,
+ * and might depend on the actual service being performed.
+ */
+ interp_set_entry(interp_table,
+ INTERP_SLOT_DIR, line + namelen + 5);
+ return run_service(interp_table, s);
+ }
}
logerror("Protocol error: '%s'", line);
#ifndef NO_IPV6
-static int socksetup(int port, int **socklist_p)
+static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
{
int socknum = 0, *socklist = NULL;
int maxfd = -1;
char pbuf[NI_MAXSERV];
-
struct addrinfo hints, *ai0, *ai;
int gai;
+ long flags;
- sprintf(pbuf, "%d", port);
+ 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(NULL, pbuf, &hints, &ai0);
+ gai = getaddrinfo(listen_addr, pbuf, &hints, &ai0);
if (gai)
die("getaddrinfo() failed: %s\n", gai_strerror(gai));
continue; /* not fatal */
}
+ flags = fcntl(sockfd, F_GETFD, 0);
+ if (flags >= 0)
+ fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
+
socklist = xrealloc(socklist, sizeof(int) * (socknum + 1));
socklist[socknum++] = sockfd;
#else /* NO_IPV6 */
-static int socksetup(int port, int **socklist_p)
+static int socksetup(char *listen_addr, int listen_port, int **socklist_p)
{
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;
- memset(&sin, 0, sizeof sin);
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = htonl(INADDR_ANY);
- sin.sin_port = htons(port);
-
if (set_reuse_addr(sockfd)) {
close(sockfd);
return 0;
return 0;
}
+ flags = fcntl(sockfd, F_GETFD, 0);
+ if (flags >= 0)
+ fcntl(sockfd, F_SETFD, flags | FD_CLOEXEC);
+
*socklist_p = xmalloc(sizeof(int));
**socklist_p = sockfd;
return 1;
FILE *f = fopen(path, "w");
if (!f)
die("cannot open pid file %s: %s", path, strerror(errno));
- fprintf(f, "%d\n", getpid());
- fclose(f);
+ if (fprintf(f, "%d\n", getpid()) < 0 || fclose(f) != 0)
+ die("failed to write pid file %s: %s", path, strerror(errno));
}
-static int serve(int port, struct passwd *pass, gid_t gid)
+static int serve(char *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
{
int socknum, *socklist;
- socknum = socksetup(port, &socklist);
+ socknum = socksetup(listen_addr, listen_port, &socklist);
if (socknum == 0)
- die("unable to allocate any listen sockets on port %u", port);
+ die("unable to allocate any listen sockets on host %s port %u",
+ listen_addr, listen_port);
if (pass && gid &&
(initgroups(pass->pw_name, gid) || setgid (gid) ||
int main(int argc, char **argv)
{
- int port = DEFAULT_GIT_PORT;
+ int listen_port = 0;
+ char *listen_addr = NULL;
int inetd_mode = 0;
const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
int detach = 0;
for (i = 1; i < argc; i++) {
char *arg = argv[i];
- if (!strncmp(arg, "--port=", 7)) {
+ if (!prefixcmp(arg, "--listen=")) {
+ char *p = arg + 9;
+ char *ph = listen_addr = xmalloc(strlen(arg + 9) + 1);
+ while (*p)
+ *ph++ = tolower(*p++);
+ *ph = 0;
+ continue;
+ }
+ if (!prefixcmp(arg, "--port=")) {
char *end;
unsigned long n;
n = strtoul(arg+7, &end, 0);
if (arg[7] && !*end) {
- port = n;
+ listen_port = n;
continue;
}
}
export_all_trees = 1;
continue;
}
- if (!strncmp(arg, "--timeout=", 10)) {
+ if (!prefixcmp(arg, "--timeout=")) {
timeout = atoi(arg+10);
continue;
}
- if (!strncmp(arg, "--init-timeout=", 15)) {
+ if (!prefixcmp(arg, "--init-timeout=")) {
init_timeout = atoi(arg+15);
continue;
}
strict_paths = 1;
continue;
}
- if (!strncmp(arg, "--base-path=", 12)) {
+ 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;
user_path = "";
continue;
}
- if (!strncmp(arg, "--user-path=", 12)) {
+ if (!prefixcmp(arg, "--user-path=")) {
user_path = arg + 12;
continue;
}
- if (!strncmp(arg, "--pid-file=", 11)) {
+ if (!prefixcmp(arg, "--pid-file=")) {
pid_file = arg + 11;
continue;
}
log_syslog = 1;
continue;
}
- if (!strncmp(arg, "--user=", 7)) {
+ if (!prefixcmp(arg, "--user=")) {
user_name = arg + 7;
continue;
}
- if (!strncmp(arg, "--group=", 8)) {
+ if (!prefixcmp(arg, "--group=")) {
group_name = arg + 8;
continue;
}
- if (!strncmp(arg, "--enable=", 9)) {
+ if (!prefixcmp(arg, "--enable=")) {
enable_service(arg + 9, 1);
continue;
}
- if (!strncmp(arg, "--disable=", 10)) {
+ if (!prefixcmp(arg, "--disable=")) {
enable_service(arg + 10, 0);
continue;
}
- if (!strncmp(arg, "--allow-override=", 17)) {
+ if (!prefixcmp(arg, "--allow-override=")) {
make_service_overridable(arg + 17, 1);
continue;
}
- if (!strncmp(arg, "--forbid-override=", 18)) {
+ if (!prefixcmp(arg, "--forbid-override=")) {
make_service_overridable(arg + 18, 0);
continue;
}
if (inetd_mode && (group_name || user_name))
die("--user and --group are incompatible with --inetd");
+ if (inetd_mode && (listen_port || listen_addr))
+ 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 (pid_file)
store_pid(pid_file);
- return serve(port, pass, gid);
+ return serve(listen_addr, listen_port, pass, gid);
}