#include "cache.h"
+#include "config.h"
#include "pkt-line.h"
-#include "exec_cmd.h"
#include "run-command.h"
#include "strbuf.h"
#include "string-list.h"
-#include <syslog.h>
-
-#ifndef HOST_NAME_MAX
-#define HOST_NAME_MAX 256
-#endif
-
-#ifndef NI_MAXSERV
-#define NI_MAXSERV 32
+#ifdef NO_INITGROUPS
+#define initgroups(x, y) (0) /* nothing */
#endif
static int log_syslog;
static int verbose;
static int reuseaddr;
+static int informative_errors;
static const char daemon_usage[] =
"git daemon [--verbose] [--syslog] [--export-all]\n"
" [--strict-paths] [--base-path=<path>] [--base-path-relaxed]\n"
" [--user-path | --user-path=<path>]\n"
" [--interpolated-path=<path>]\n"
-" [--reuseaddr] [--detach] [--pid-file=<file>]\n"
+" [--reuseaddr] [--pid-file=<file>]\n"
" [--(enable|disable|allow-override|forbid-override)=<service>]\n"
+" [--access-hook=<path>]\n"
" [--inetd | [--listen=<host_or_ipaddr>] [--port=<n>]\n"
-" [--user=<user> [--group=<group>]]\n"
+" [--detach] [--user=<user> [--group=<group>]]\n"
" [<directory>...]";
/* List of acceptable pathname prefixes */
-static char **ok_paths;
+static const char **ok_paths;
static int strict_paths;
/* If this is set, git-daemon-export-ok is not required */
static int export_all_trees;
/* Take all paths relative to this one if non-NULL */
-static char *base_path;
-static char *interpolated_path;
+static const char *base_path;
+static const 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
* go to /home/alice/pub_git/frotz with --user-path=pub_git.
static unsigned int timeout;
static unsigned int init_timeout;
-static char *hostname;
-static char *canon_hostname;
-static char *ip_address;
-static char *tcp_port;
+struct hostinfo {
+ struct strbuf hostname;
+ struct strbuf canon_hostname;
+ struct strbuf ip_address;
+ struct strbuf tcp_port;
+ unsigned int hostname_lookup_done:1;
+ unsigned int saw_extended_args:1;
+};
+
+static void lookup_hostname(struct hostinfo *hi);
+
+static const char *get_canon_hostname(struct hostinfo *hi)
+{
+ lookup_hostname(hi);
+ return hi->canon_hostname.buf;
+}
+
+static const char *get_ip_address(struct hostinfo *hi)
+{
+ lookup_hostname(hi);
+ return hi->ip_address.buf;
+}
static void logreport(int priority, const char *err, va_list params)
{
syslog(priority, "%s", buf);
} else {
/*
- * Since stderr is set to linebuffered mode, the
+ * Since stderr is set to buffered mode, the
* logging of different processes will not overlap
+ * unless they overflow the (rather big) buffers.
*/
fprintf(stderr, "[%"PRIuMAX"] ", (uintmax_t)getpid());
vfprintf(stderr, err, params);
fputc('\n', stderr);
+ fflush(stderr);
}
}
exit(1);
}
-static char *path_ok(char *directory)
+struct expand_path_context {
+ const char *directory;
+ struct hostinfo *hostinfo;
+};
+
+static size_t expand_path(struct strbuf *sb, const char *placeholder, void *ctx)
+{
+ struct expand_path_context *context = ctx;
+ struct hostinfo *hi = context->hostinfo;
+
+ switch (placeholder[0]) {
+ case 'H':
+ strbuf_addbuf(sb, &hi->hostname);
+ return 1;
+ case 'C':
+ if (placeholder[1] == 'H') {
+ strbuf_addstr(sb, get_canon_hostname(hi));
+ return 2;
+ }
+ break;
+ case 'I':
+ if (placeholder[1] == 'P') {
+ strbuf_addstr(sb, get_ip_address(hi));
+ return 2;
+ }
+ break;
+ case 'P':
+ strbuf_addbuf(sb, &hi->tcp_port);
+ return 1;
+ case 'D':
+ strbuf_addstr(sb, context->directory);
+ return 1;
+ }
+ return 0;
+}
+
+static const char *path_ok(const char *directory, struct hostinfo *hi)
{
static char rpath[PATH_MAX];
static char interp_path[PATH_MAX];
- char *path;
- char *dir;
+ size_t rlen;
+ const char *path;
+ const char *dir;
dir = directory;
* "~alice/%s/foo".
*/
int namlen, restlen = strlen(dir);
- char *slash = strchr(dir, '/');
+ const char *slash = strchr(dir, '/');
if (!slash)
slash = dir + restlen;
namlen = slash - dir;
restlen -= namlen;
loginfo("userpath <%s>, request <%s>, namlen %d, restlen %d, slash <%s>", user_path, dir, namlen, restlen, slash);
- snprintf(rpath, PATH_MAX, "%.*s/%s%.*s",
- namlen, dir, user_path, restlen, slash);
+ rlen = snprintf(rpath, sizeof(rpath), "%.*s/%s%.*s",
+ namlen, dir, user_path, restlen, slash);
+ if (rlen >= sizeof(rpath)) {
+ logerror("user-path too large: %s", rpath);
+ return NULL;
+ }
dir = rpath;
}
}
- else if (interpolated_path && saw_extended_args) {
+ else if (interpolated_path && hi->saw_extended_args) {
struct strbuf expanded_path = STRBUF_INIT;
- struct strbuf_expand_dict_entry dict[6];
-
- dict[0].placeholder = "H"; dict[0].value = hostname;
- dict[1].placeholder = "CH"; dict[1].value = canon_hostname;
- dict[2].placeholder = "IP"; dict[2].value = ip_address;
- dict[3].placeholder = "P"; dict[3].value = tcp_port;
- dict[4].placeholder = "D"; dict[4].value = directory;
- dict[5].placeholder = NULL; dict[5].value = NULL;
+ struct expand_path_context context;
+
+ context.directory = directory;
+ context.hostinfo = hi;
+
if (*dir != '/') {
/* Allow only absolute */
logerror("'%s': Non-absolute path denied (interpolated-path active)", dir);
}
strbuf_expand(&expanded_path, interpolated_path,
- strbuf_expand_dict_cb, &dict);
- strlcpy(interp_path, expanded_path.buf, PATH_MAX);
+ expand_path, &context);
+
+ rlen = strlcpy(interp_path, expanded_path.buf,
+ sizeof(interp_path));
+ if (rlen >= sizeof(interp_path)) {
+ logerror("interpolated path too large: %s",
+ interp_path);
+ return NULL;
+ }
+
strbuf_release(&expanded_path);
loginfo("Interpolated dir '%s'", interp_path);
logerror("'%s': Non-absolute path denied (base-path active)", dir);
return NULL;
}
- snprintf(rpath, PATH_MAX, "%s%s", base_path, dir);
+ rlen = snprintf(rpath, sizeof(rpath), "%s%s", base_path, dir);
+ if (rlen >= sizeof(rpath)) {
+ logerror("base-path too large: %s", rpath);
+ return NULL;
+ }
dir = rpath;
}
}
if ( ok_paths && *ok_paths ) {
- char **pp;
+ const char **pp;
int pathlen = strlen(path);
/* The validation is done on the paths after enter_repo
return NULL; /* Fallthrough. Deny by default */
}
-typedef int (*daemon_service_fn)(void);
+typedef int (*daemon_service_fn)(const struct argv_array *env);
struct daemon_service {
const char *name;
const char *config_name;
int overridable;
};
-static struct daemon_service *service_looking_at;
-static int service_enabled;
+static int daemon_error(const char *dir, const char *msg)
+{
+ if (!informative_errors)
+ msg = "access denied or repository not exported";
+ packet_write_fmt(1, "ERR %s: %s", msg, dir);
+ return -1;
+}
+
+static const char *access_hook;
-static int git_daemon_config(const char *var, const char *value, void *cb)
+static int run_access_hook(struct daemon_service *service, const char *dir,
+ const char *path, struct hostinfo *hi)
{
- if (!prefixcmp(var, "daemon.") &&
- !strcmp(var + 7, service_looking_at->config_name)) {
- service_enabled = git_config_bool(var, value);
+ struct child_process child = CHILD_PROCESS_INIT;
+ struct strbuf buf = STRBUF_INIT;
+ const char *argv[8];
+ const char **arg = argv;
+ char *eol;
+ int seen_errors = 0;
+
+ *arg++ = access_hook;
+ *arg++ = service->name;
+ *arg++ = path;
+ *arg++ = hi->hostname.buf;
+ *arg++ = get_canon_hostname(hi);
+ *arg++ = get_ip_address(hi);
+ *arg++ = hi->tcp_port.buf;
+ *arg = NULL;
+
+ child.use_shell = 1;
+ child.argv = argv;
+ child.no_stdin = 1;
+ child.no_stderr = 1;
+ child.out = -1;
+ if (start_command(&child)) {
+ logerror("daemon access hook '%s' failed to start",
+ access_hook);
+ goto error_return;
+ }
+ if (strbuf_read(&buf, child.out, 0) < 0) {
+ logerror("failed to read from pipe to daemon access hook '%s'",
+ access_hook);
+ strbuf_reset(&buf);
+ seen_errors = 1;
+ }
+ if (close(child.out) < 0) {
+ logerror("failed to close pipe to daemon access hook '%s'",
+ access_hook);
+ seen_errors = 1;
+ }
+ if (finish_command(&child))
+ seen_errors = 1;
+
+ if (!seen_errors) {
+ strbuf_release(&buf);
return 0;
}
- /* we are not interested in parsing any other configuration here */
- return 0;
+error_return:
+ strbuf_ltrim(&buf);
+ if (!buf.len)
+ strbuf_addstr(&buf, "service rejected");
+ eol = strchr(buf.buf, '\n');
+ if (eol)
+ *eol = '\0';
+ errno = EACCES;
+ daemon_error(dir, buf.buf);
+ strbuf_release(&buf);
+ return -1;
}
-static int run_service(char *dir, struct daemon_service *service)
+static int run_service(const char *dir, struct daemon_service *service,
+ struct hostinfo *hi, const struct argv_array *env)
{
const char *path;
int enabled = service->enabled;
+ struct strbuf var = STRBUF_INIT;
loginfo("Request %s for '%s'", service->name, dir);
if (!enabled && !service->overridable) {
logerror("'%s': service not enabled.", service->name);
errno = EACCES;
- return -1;
+ return daemon_error(dir, "service not enabled");
}
- if (!(path = path_ok(dir)))
- return -1;
+ if (!(path = path_ok(dir, hi)))
+ return daemon_error(dir, "no such repository");
/*
* Security on the cheap.
if (!export_all_trees && access("git-daemon-export-ok", F_OK)) {
logerror("'%s': repository not exported.", path);
errno = EACCES;
- return -1;
+ return daemon_error(dir, "repository not exported");
}
if (service->overridable) {
- service_looking_at = service;
- service_enabled = -1;
- git_config(git_daemon_config, NULL);
- if (0 <= service_enabled)
- enabled = service_enabled;
+ strbuf_addf(&var, "daemon.%s", service->config_name);
+ git_config_get_bool(var.buf, &enabled);
+ strbuf_release(&var);
}
if (!enabled) {
logerror("'%s': service not enabled for '%s'",
service->name, path);
errno = EACCES;
- return -1;
+ return daemon_error(dir, "service not enabled");
}
+ /*
+ * Optionally, a hook can choose to deny access to the
+ * repository depending on the phase of the moon.
+ */
+ if (access_hook && run_access_hook(service, dir, path, hi))
+ return -1;
+
/*
* We'll ignore SIGTERM from now on, we have a
* good client.
*/
signal(SIGTERM, SIG_IGN);
- return service->fn();
+ return service->fn(env);
}
static void copy_to_log(int fd)
return;
}
- while (strbuf_getline(&line, fp, '\n') != EOF) {
+ while (strbuf_getline_lf(&line, fp) != EOF) {
logerror("%s", line.buf);
strbuf_setlen(&line, 0);
}
fclose(fp);
}
-static int run_service_command(const char **argv)
+static int run_service_command(struct child_process *cld)
{
- struct child_process cld;
-
- memset(&cld, 0, sizeof(cld));
- cld.argv = argv;
- cld.git_cmd = 1;
- cld.err = -1;
- if (start_command(&cld))
+ argv_array_push(&cld->args, ".");
+ cld->git_cmd = 1;
+ cld->err = -1;
+ if (start_command(cld))
return -1;
close(0);
close(1);
- copy_to_log(cld.err);
+ copy_to_log(cld->err);
- return finish_command(&cld);
+ return finish_command(cld);
}
-static int upload_pack(void)
+static int upload_pack(const struct argv_array *env)
{
- /* Timeout as string */
- char timeout_buf[64];
- const char *argv[] = { "upload-pack", "--strict", NULL, ".", NULL };
+ struct child_process cld = CHILD_PROCESS_INIT;
+ argv_array_pushl(&cld.args, "upload-pack", "--strict", NULL);
+ argv_array_pushf(&cld.args, "--timeout=%u", timeout);
- argv[2] = timeout_buf;
+ argv_array_pushv(&cld.env_array, env->argv);
- snprintf(timeout_buf, sizeof timeout_buf, "--timeout=%u", timeout);
- return run_service_command(argv);
+ return run_service_command(&cld);
}
-static int upload_archive(void)
+static int upload_archive(const struct argv_array *env)
{
- static const char *argv[] = { "upload-archive", ".", NULL };
- return run_service_command(argv);
+ struct child_process cld = CHILD_PROCESS_INIT;
+ argv_array_push(&cld.args, "upload-archive");
+
+ argv_array_pushv(&cld.env_array, env->argv);
+
+ return run_service_command(&cld);
}
-static int receive_pack(void)
+static int receive_pack(const struct argv_array *env)
{
- static const char *argv[] = { "receive-pack", ".", NULL };
- return run_service_command(argv);
+ struct child_process cld = CHILD_PROCESS_INIT;
+ argv_array_push(&cld.args, "receive-pack");
+
+ argv_array_pushv(&cld.env_array, env->argv);
+
+ return run_service_command(&cld);
}
static struct daemon_service daemon_service[] = {
die("No such service %s", name);
}
-static char *xstrdup_tolower(const char *str)
-{
- char *p, *dup = xstrdup(str);
- for (p = dup; *p; p++)
- *p = tolower(*p);
- return dup;
-}
-
static void parse_host_and_port(char *hostport, char **host,
char **port)
{
}
}
+/*
+ * Sanitize a string from the client so that it's OK to be inserted into a
+ * filesystem path. Specifically, we disallow slashes, 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 (*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
+ * arguemnt, or 'extra_args' if there is no host arguemnt.
*/
-static void parse_host_arg(char *extra_args, int buflen)
+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) {
- saw_extended_args = 1;
+ 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) {
- free(tcp_port);
- tcp_port = xstrdup(port);
- }
- free(hostname);
- hostname = xstrdup_tolower(host);
+ if (port)
+ sanitize_client(&hi->tcp_port, port);
+ canonicalize_client(&hi->hostname, host);
+ hi->hostname_lookup_done = 0;
}
/* On to the next one */
die("Invalid request");
}
- /*
- * Locate canonical hostname and its IP address.
- */
- if (hostname) {
+ return extra_args;
+}
+
+static void parse_extra_args(struct hostinfo *hi, struct argv_array *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 specificly (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);
+ argv_array_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;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
- gai = getaddrinfo(hostname, NULL, &hints, &ai);
+ 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));
- free(ip_address);
- ip_address = xstrdup(addrbuf);
+ strbuf_addstr(&hi->ip_address, addrbuf);
- free(canon_hostname);
- canon_hostname = xstrdup(ai->ai_canonname ?
- ai->ai_canonname : ip_address);
+ if (ai->ai_canonname)
+ sanitize_client(&hi->canon_hostname,
+ ai->ai_canonname);
+ else
+ strbuf_addbuf(&hi->canon_hostname,
+ &hi->ip_address);
freeaddrinfo(ai);
}
char **ap;
static char addrbuf[HOST_NAME_MAX + 1];
- hent = gethostbyname(hostname);
+ 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);
- 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));
+ inet_ntop(hent->h_addrtype, &sa.sin_addr,
+ addrbuf, sizeof(addrbuf));
- free(canon_hostname);
- canon_hostname = xstrdup(hent->h_name);
- free(ip_address);
- ip_address = xstrdup(addrbuf);
+ sanitize_client(&hi->canon_hostname, hent->h_name);
+ strbuf_addstr(&hi->ip_address, addrbuf);
+ }
#endif
+ hi->hostname_lookup_done = 1;
}
}
+static void hostinfo_init(struct hostinfo *hi)
+{
+ memset(hi, 0, sizeof(*hi));
+ strbuf_init(&hi->hostname, 0);
+ strbuf_init(&hi->canon_hostname, 0);
+ strbuf_init(&hi->ip_address, 0);
+ strbuf_init(&hi->tcp_port, 0);
+}
-static int execute(struct sockaddr *addr)
+static void hostinfo_clear(struct hostinfo *hi)
{
- static char line[1000];
- int pktlen, len, i;
+ strbuf_release(&hi->hostname);
+ strbuf_release(&hi->canon_hostname);
+ strbuf_release(&hi->ip_address);
+ strbuf_release(&hi->tcp_port);
+}
- if (addr) {
- char addrbuf[256] = "";
- int port = -1;
+static void set_keep_alive(int sockfd)
+{
+ int ka = 1;
- if (addr->sa_family == AF_INET) {
- struct sockaddr_in *sin_addr = (void *) addr;
- inet_ntop(addr->sa_family, &sin_addr->sin_addr, addrbuf, sizeof(addrbuf));
- port = ntohs(sin_addr->sin_port);
-#ifndef NO_IPV6
- } else if (addr && addr->sa_family == AF_INET6) {
- struct sockaddr_in6 *sin6_addr = (void *) addr;
+ 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));
+ }
+}
- char *buf = addrbuf;
- *buf++ = '['; *buf = '\0'; /* stpcpy() is cool */
- inet_ntop(AF_INET6, &sin6_addr->sin6_addr, buf, sizeof(addrbuf) - 1);
- strcat(buf, "]");
+static int execute(void)
+{
+ char *line = packet_buffer;
+ int pktlen, len, i;
+ char *addr = getenv("REMOTE_ADDR"), *port = getenv("REMOTE_PORT");
+ struct hostinfo hi;
+ struct argv_array env = ARGV_ARRAY_INIT;
- port = ntohs(sin6_addr->sin6_port);
-#endif
- }
- loginfo("Connection from %s:%d", addrbuf, port);
- setenv("REMOTE_ADDR", addrbuf, 1);
- }
- else {
- unsetenv("REMOTE_ADDR");
- }
+ hostinfo_init(&hi);
+
+ if (addr)
+ loginfo("Connection from %s:%s", addr, port);
+ set_keep_alive(0);
alarm(init_timeout ? init_timeout : timeout);
- pktlen = packet_read_line(0, line, sizeof(line));
+ pktlen = packet_read(0, NULL, NULL, packet_buffer, sizeof(packet_buffer), 0);
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 && line[len-1] == '\n')
+ line[len-1] = 0;
+ /* parse additional args hidden behind a NUL byte */
if (len != pktlen)
- parse_host_arg(line + len + 1, pktlen - len - 1);
+ 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]);
- int namelen = strlen(s->name);
- if (!prefixcmp(line, "git-") &&
- !strncmp(s->name, line + 4, namelen) &&
- line[namelen + 4] == ' ') {
+ 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.
*/
- return run_service(line + namelen + 5, s);
+ int rc = run_service(arg, s, &hi, &env);
+ hostinfo_clear(&hi);
+ argv_array_clear(&env);
+ return rc;
}
}
+ hostinfo_clear(&hi);
+ argv_array_clear(&env);
logerror("Protocol error: '%s'", line);
return -1;
}
static struct child {
struct child *next;
- pid_t pid;
+ struct child_process cld;
struct sockaddr_storage address;
} *firstborn;
-static void add_child(pid_t pid, struct sockaddr *addr, int addrlen)
+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++;
- newborn->pid = pid;
+ memcpy(&newborn->cld, cld, sizeof(*cld));
memcpy(&newborn->address, addr, addrlen);
for (cradle = &firstborn; *cradle; cradle = &(*cradle)->next)
if (!addrcmp(&(*cradle)->address, &newborn->address))
*cradle = newborn;
}
-static void remove_child(pid_t pid)
-{
- struct child **cradle, *blanket;
-
- for (cradle = &firstborn; (blanket = *cradle); cradle = &blanket->next)
- if (blanket->pid == pid) {
- *cradle = blanket->next;
- live_children--;
- free(blanket);
- break;
- }
-}
-
/*
* This gets called if the number of connections grows
* past "max_connections".
for (; (next = blanket->next); blanket = next)
if (!addrcmp(&blanket->address, &next->address)) {
- kill(blanket->pid, SIGTERM);
+ kill(blanket->cld.pid, SIGTERM);
break;
}
}
int status;
pid_t pid;
- while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
- const char *dead = "";
- remove_child(pid);
- if (!WIFEXITED(status) || (WEXITSTATUS(status) > 0))
- dead = " (with error)";
- loginfo("[%"PRIuMAX"] Disconnected%s", (uintmax_t)pid, dead);
- }
+ 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 void handle(int incoming, struct sockaddr *addr, int addrlen)
+static struct argv_array cld_argv = ARGV_ARRAY_INIT;
+static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
{
- pid_t pid;
+ struct child_process cld = CHILD_PROCESS_INIT;
if (max_connections && live_children >= max_connections) {
kill_some_child();
}
}
- if ((pid = fork())) {
- close(incoming);
- if (pid < 0) {
- logerror("Couldn't fork %s", strerror(errno));
- return;
- }
-
- add_child(pid, addr, addrlen);
- 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));
+ argv_array_pushf(&cld.env_array, "REMOTE_ADDR=%s", buf);
+ argv_array_pushf(&cld.env_array, "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));
+ argv_array_pushf(&cld.env_array, "REMOTE_ADDR=[%s]", buf);
+ argv_array_pushf(&cld.env_array, "REMOTE_PORT=%d",
+ ntohs(sin6_addr->sin6_port));
+#endif
}
- dup2(incoming, 0);
- dup2(incoming, 1);
- close(incoming);
+ cld.argv = cld_argv.argv;
+ cld.in = incoming;
+ cld.out = dup(incoming);
- exit(execute(addr));
+ if (start_command(&cld))
+ logerror("unable to fork");
+ else
+ add_child(&cld, addr, addrlen);
}
static void child_handler(int signo)
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;
- int maxfd = -1;
char pbuf[NI_MAXSERV];
struct addrinfo hints, *ai0, *ai;
int gai;
long flags;
- sprintf(pbuf, "%d", listen_port);
+ xsnprintf(pbuf, sizeof(pbuf), "%d", listen_port);
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
#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 */
}
ALLOC_GROW(socklist->list, socklist->nr + 1, socklist->alloc);
socklist->list[socklist->nr++] = sockfd;
socknum++;
-
- if (maxfd < sockfd)
- maxfd = sockfd;
}
freeaddrinfo(ai0);
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;
}
for (i = 0; i < socklist->nr; i++) {
if (pfd[i].revents & POLLIN) {
- struct sockaddr_storage ss;
- unsigned int sslen = sizeof(ss);
- int incoming = accept(pfd[i].fd, (struct sockaddr *)&ss, &sslen);
+ 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:
die_errno("accept returned");
}
}
- handle(incoming, (struct sockaddr *)&ss, sslen);
+ handle(incoming, &ss.sa, sslen);
}
}
}
}
-/* if any standard file descriptor is missing open it to /dev/null */
-static void sanitize_stdfds(void)
+#ifdef NO_POSIX_GOODIES
+
+struct credentials;
+
+static void drop_privileges(struct credentials *cred)
{
- 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);
+ /* nothing */
}
-static void daemonize(void)
+static struct credentials *prepare_credentials(const char *user_name,
+ const char *group_name)
{
- 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();
+ die("--user not supported on this platform");
}
-static void store_pid(const char *path)
+#else
+
+struct credentials {
+ struct passwd *pass;
+ gid_t gid;
+};
+
+static void drop_privileges(struct credentials *cred)
{
- 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);
+ if (cred && (initgroups(cred->pass->pw_name, cred->gid) ||
+ setgid (cred->gid) || setuid(cred->pass->pw_uid)))
+ die("cannot drop privileges");
}
-static int serve(struct string_list *listen_addr, int listen_port, struct passwd *pass, gid_t gid)
+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 };
die("unable to allocate any listen sockets on port %u",
listen_port);
- if (pass && gid &&
- (initgroups(pass->pw_name, gid) || setgid (gid) ||
- setuid(pass->pw_uid)))
- die("cannot drop privileges");
+ drop_privileges(cred);
+
+ loginfo("Ready to rumble");
return service_loop(&socklist);
}
-int main(int argc, char **argv)
+int cmd_main(int argc, const char **argv)
{
int listen_port = 0;
struct string_list listen_addr = STRING_LIST_INIT_NODUP;
- int inetd_mode = 0;
+ int serve_mode = 0, inetd_mode = 0;
const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
int detach = 0;
- struct passwd *pass = NULL;
- struct group *group;
- gid_t gid = 0;
+ struct credentials *cred = NULL;
int i;
- git_extract_argv0_path(argv[0]);
-
for (i = 1; i < argc; i++) {
- char *arg = argv[i];
+ const char *arg = argv[i];
+ const char *v;
- if (!prefixcmp(arg, "--listen=")) {
- string_list_append(&listen_addr, xstrdup_tolower(arg + 9));
+ if (skip_prefix(arg, "--listen=", &v)) {
+ string_list_append(&listen_addr, xstrdup_tolower(v));
continue;
}
- if (!prefixcmp(arg, "--port=")) {
+ if (skip_prefix(arg, "--port=", &v)) {
char *end;
unsigned long n;
- n = strtoul(arg+7, &end, 0);
- if (arg[7] && !*end) {
+ 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;
log_syslog = 1;
export_all_trees = 1;
continue;
}
- if (!prefixcmp(arg, "--timeout=")) {
- timeout = atoi(arg+10);
+ if (skip_prefix(arg, "--access-hook=", &v)) {
+ access_hook = v;
+ continue;
+ }
+ if (skip_prefix(arg, "--timeout=", &v)) {
+ timeout = atoi(v);
continue;
}
- if (!prefixcmp(arg, "--init-timeout=")) {
- init_timeout = atoi(arg+15);
+ if (skip_prefix(arg, "--init-timeout=", &v)) {
+ init_timeout = atoi(v);
continue;
}
- if (!prefixcmp(arg, "--max-connections=")) {
- max_connections = atoi(arg+18);
+ if (skip_prefix(arg, "--max-connections=", &v)) {
+ max_connections = atoi(v);
if (max_connections < 0)
max_connections = 0; /* unlimited */
continue;
strict_paths = 1;
continue;
}
- if (!prefixcmp(arg, "--base-path=")) {
- base_path = arg+12;
+ if (skip_prefix(arg, "--base-path=", &v)) {
+ base_path = v;
continue;
}
if (!strcmp(arg, "--base-path-relaxed")) {
base_path_relaxed = 1;
continue;
}
- if (!prefixcmp(arg, "--interpolated-path=")) {
- interpolated_path = arg+20;
+ if (skip_prefix(arg, "--interpolated-path=", &v)) {
+ interpolated_path = v;
continue;
}
if (!strcmp(arg, "--reuseaddr")) {
user_path = "";
continue;
}
- if (!prefixcmp(arg, "--user-path=")) {
- user_path = arg + 12;
+ if (skip_prefix(arg, "--user-path=", &v)) {
+ user_path = v;
continue;
}
- if (!prefixcmp(arg, "--pid-file=")) {
- pid_file = arg + 11;
+ if (skip_prefix(arg, "--pid-file=", &v)) {
+ pid_file = v;
continue;
}
if (!strcmp(arg, "--detach")) {
log_syslog = 1;
continue;
}
- if (!prefixcmp(arg, "--user=")) {
- user_name = arg + 7;
+ if (skip_prefix(arg, "--user=", &v)) {
+ user_name = v;
+ continue;
+ }
+ if (skip_prefix(arg, "--group=", &v)) {
+ group_name = v;
continue;
}
- if (!prefixcmp(arg, "--group=")) {
- group_name = arg + 8;
+ if (skip_prefix(arg, "--enable=", &v)) {
+ enable_service(v, 1);
continue;
}
- if (!prefixcmp(arg, "--enable=")) {
- enable_service(arg + 9, 1);
+ if (skip_prefix(arg, "--disable=", &v)) {
+ enable_service(v, 0);
continue;
}
- if (!prefixcmp(arg, "--disable=")) {
- enable_service(arg + 10, 0);
+ if (skip_prefix(arg, "--allow-override=", &v)) {
+ make_service_overridable(v, 1);
continue;
}
- if (!prefixcmp(arg, "--allow-override=")) {
- make_service_overridable(arg + 17, 1);
+ if (skip_prefix(arg, "--forbid-override=", &v)) {
+ make_service_overridable(v, 0);
continue;
}
- if (!prefixcmp(arg, "--forbid-override=")) {
- make_service_overridable(arg + 18, 0);
+ if (!strcmp(arg, "--informative-errors")) {
+ informative_errors = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--no-informative-errors")) {
+ informative_errors = 0;
continue;
}
if (!strcmp(arg, "--")) {
set_die_routine(daemon_die);
} else
/* avoid splitting a message in the middle */
- setvbuf(stderr, NULL, _IOLBF, 0);
+ setvbuf(stderr, NULL, _IOFBF, 4096);
- if (inetd_mode && (group_name || user_name))
- die("--user and --group are incompatible with --inetd");
+ 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");
if (group_name && !user_name)
die("--group supplied without --user");
- if (user_name) {
- pass = getpwnam(user_name);
- if (!pass)
- die("user not found - %s", user_name);
-
- if (!group_name)
- gid = pass->pw_gid;
- else {
- group = getgrnam(group_name);
- if (!group)
- die("group not found - %s", group_name);
-
- gid = group->gr_gid;
- }
- }
+ if (user_name)
+ cred = prepare_credentials(user_name, group_name);
if (strict_paths && (!ok_paths || !*ok_paths))
die("option --strict-paths requires a whitelist");
base_path);
if (inetd_mode) {
- struct sockaddr_storage ss;
- struct sockaddr *peer = (struct sockaddr *)&ss;
- socklen_t slen = sizeof(ss);
-
if (!freopen("/dev/null", "w", stderr))
die_errno("failed to redirect stderr to /dev/null");
-
- if (getpeername(0, peer, &slen))
- peer = NULL;
-
- return execute(peer);
}
+ if (inetd_mode || serve_mode)
+ return execute();
+
if (detach) {
- daemonize();
- loginfo("Ready to rumble");
+ if (daemonize())
+ die("--detach not supported on this platform");
}
- else
- sanitize_stdfds();
if (pid_file)
- store_pid(pid_file);
+ write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
+
+ /* prepare argv for serving-processes */
+ argv_array_push(&cld_argv, argv[0]); /* git-daemon */
+ argv_array_push(&cld_argv, "--serve");
+ for (i = 1; i < argc; ++i)
+ argv_array_push(&cld_argv, argv[i]);
- return serve(&listen_addr, listen_port, pass, gid);
+ return serve(&listen_addr, listen_port, cred);
}