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-rw-r--r--http-backend.c128
1 files changed, 103 insertions, 25 deletions
diff --git a/http-backend.c b/http-backend.c
index b6c0484fb2..501bf797c0 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -13,18 +13,20 @@ static const char content_type[] = "Content-Type";
static const char content_length[] = "Content-Length";
static const char last_modified[] = "Last-Modified";
static int getanyfile = 1;
+static unsigned long max_request_buffer = 10 * 1024 * 1024;
static struct string_list *query_params;
struct rpc_service {
const char *name;
const char *config_name;
+ unsigned buffer_input : 1;
signed enabled : 2;
};
static struct rpc_service rpc_service[] = {
- { "upload-pack", "uploadpack", 1 },
- { "receive-pack", "receivepack", -1 },
+ { "upload-pack", "uploadpack", 1, 1 },
+ { "receive-pack", "receivepack", 0, -1 },
};
static struct string_list *get_parameters(void)
@@ -225,6 +227,7 @@ static void http_config(void)
struct strbuf var = STRBUF_INIT;
git_config_get_bool("http.getanyfile", &getanyfile);
+ git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
struct rpc_service *svc = &rpc_service[i];
@@ -266,9 +269,52 @@ static struct rpc_service *select_service(const char *name)
return svc;
}
-static void inflate_request(const char *prog_name, int out)
+/*
+ * This is basically strbuf_read(), except that if we
+ * hit max_request_buffer we die (we'd rather reject a
+ * maliciously large request than chew up infinite memory).
+ */
+static ssize_t read_request(int fd, unsigned char **out)
+{
+ size_t len = 0, alloc = 8192;
+ unsigned char *buf = xmalloc(alloc);
+
+ if (max_request_buffer < alloc)
+ max_request_buffer = alloc;
+
+ while (1) {
+ ssize_t cnt;
+
+ cnt = read_in_full(fd, buf + len, alloc - len);
+ if (cnt < 0) {
+ free(buf);
+ return -1;
+ }
+
+ /* partial read from read_in_full means we hit EOF */
+ len += cnt;
+ if (len < alloc) {
+ *out = buf;
+ return len;
+ }
+
+ /* otherwise, grow and try again (if we can) */
+ if (alloc == max_request_buffer)
+ die("request was larger than our maximum size (%lu);"
+ " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
+ max_request_buffer);
+
+ alloc = alloc_nr(alloc);
+ if (alloc > max_request_buffer)
+ alloc = max_request_buffer;
+ REALLOC_ARRAY(buf, alloc);
+ }
+}
+
+static void inflate_request(const char *prog_name, int out, int buffer_input)
{
git_zstream stream;
+ unsigned char *full_request = NULL;
unsigned char in_buf[8192];
unsigned char out_buf[8192];
unsigned long cnt = 0;
@@ -277,11 +323,21 @@ static void inflate_request(const char *prog_name, int out)
git_inflate_init_gzip_only(&stream);
while (1) {
- ssize_t n = xread(0, in_buf, sizeof(in_buf));
+ ssize_t n;
+
+ if (buffer_input) {
+ if (full_request)
+ n = 0; /* nothing left to read */
+ else
+ n = read_request(0, &full_request);
+ stream.next_in = full_request;
+ } else {
+ n = xread(0, in_buf, sizeof(in_buf));
+ stream.next_in = in_buf;
+ }
+
if (n <= 0)
die("request ended in the middle of the gzip stream");
-
- stream.next_in = in_buf;
stream.avail_in = n;
while (0 < stream.avail_in) {
@@ -307,9 +363,22 @@ static void inflate_request(const char *prog_name, int out)
done:
git_inflate_end(&stream);
close(out);
+ free(full_request);
+}
+
+static void copy_request(const char *prog_name, int out)
+{
+ unsigned char *buf;
+ ssize_t n = read_request(0, &buf);
+ if (n < 0)
+ die_errno("error reading request body");
+ if (write_in_full(out, buf, n) != n)
+ die("%s aborted reading request", prog_name);
+ close(out);
+ free(buf);
}
-static void run_service(const char **argv)
+static void run_service(const char **argv, int buffer_input)
{
const char *encoding = getenv("HTTP_CONTENT_ENCODING");
const char *user = getenv("REMOTE_USER");
@@ -334,7 +403,7 @@ static void run_service(const char **argv)
"GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
cld.argv = argv;
- if (gzipped_request)
+ if (buffer_input || gzipped_request)
cld.in = -1;
cld.git_cmd = 1;
if (start_command(&cld))
@@ -342,7 +411,9 @@ static void run_service(const char **argv)
close(1);
if (gzipped_request)
- inflate_request(argv[0], cld.in);
+ inflate_request(argv[0], cld.in, buffer_input);
+ else if (buffer_input)
+ copy_request(argv[0], cld.in);
else
close(0);
@@ -350,16 +421,16 @@ static void run_service(const char **argv)
exit(1);
}
-static int show_text_ref(const char *name, const unsigned char *sha1,
- int flag, void *cb_data)
+static int show_text_ref(const char *name, const struct object_id *oid,
+ int flag, void *cb_data)
{
const char *name_nons = strip_namespace(name);
struct strbuf *buf = cb_data;
- struct object *o = parse_object(sha1);
+ struct object *o = parse_object(oid->hash);
if (!o)
return 0;
- strbuf_addf(buf, "%s\t%s\n", sha1_to_hex(sha1), name_nons);
+ strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
if (o->type == OBJ_TAG) {
o = deref_tag(o, name, 0);
if (!o)
@@ -392,7 +463,7 @@ static void get_info_refs(char *arg)
packet_flush(1);
argv[0] = svc->name;
- run_service(argv);
+ run_service(argv, 0);
} else {
select_getanyfile();
@@ -402,21 +473,21 @@ static void get_info_refs(char *arg)
strbuf_release(&buf);
}
-static int show_head_ref(const char *refname, const unsigned char *sha1,
- int flag, void *cb_data)
+static int show_head_ref(const char *refname, const struct object_id *oid,
+ int flag, void *cb_data)
{
struct strbuf *buf = cb_data;
if (flag & REF_ISSYMREF) {
- unsigned char unused[20];
+ struct object_id unused;
const char *target = resolve_ref_unsafe(refname,
RESOLVE_REF_READING,
- unused, NULL);
+ unused.hash, NULL);
const char *target_nons = strip_namespace(target);
strbuf_addf(buf, "ref: %s\n", target_nons);
} else {
- strbuf_addf(buf, "%s\n", sha1_to_hex(sha1));
+ strbuf_addf(buf, "%s\n", oid_to_hex(oid));
}
return 0;
@@ -496,25 +567,28 @@ static void service_rpc(char *service_name)
end_headers();
argv[0] = svc->name;
- run_service(argv);
+ run_service(argv, svc->buffer_input);
strbuf_release(&buf);
}
+static int dead;
static NORETURN void die_webcgi(const char *err, va_list params)
{
- static int dead;
+ if (dead <= 1) {
+ vreportf("fatal: ", err, params);
- if (!dead) {
- dead = 1;
http_status(500, "Internal Server Error");
hdr_nocache();
end_headers();
-
- vreportf("fatal: ", err, params);
}
exit(0); /* we successfully reported a failure ;-) */
}
+static int die_webcgi_recursing(void)
+{
+ return dead++ > 1;
+}
+
static char* getdir(void)
{
struct strbuf buf = STRBUF_INIT;
@@ -569,6 +643,7 @@ int main(int argc, char **argv)
git_extract_argv0_path(argv[0]);
set_die_routine(die_webcgi);
+ set_die_is_recursing_routine(die_webcgi_recursing);
if (!method)
die("No REQUEST_METHOD from server");
@@ -619,6 +694,9 @@ int main(int argc, char **argv)
not_found("Repository not exported: '%s'", dir);
http_config();
+ max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
+ max_request_buffer);
+
cmd->imp(cmd_arg);
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 18:58:31 +0000