Revision 8db1e8743c0f1ed241f6a1b8bf55b6fef07d6751 authored by Johannes Schindelin on 28 March 2024, 18:21:06 UTC, committed by Johannes Schindelin on 19 April 2024, 10:38:23 UTC
Critical security issues typically combine relatively common vulnerabilities such as case confusion in file paths with other weaknesses in order to raise the severity of the attack. One such weakness that has haunted the Git project in many a submodule-related CVE is that any hooks that are found are executed during a clone operation. Examples are the `post-checkout` and `fsmonitor` hooks. However, Git's design calls for hooks to be disabled by default, as only disabled example hooks are copied over from the templates in `<prefix>/share/git-core/templates/`. As a defense-in-depth measure, let's prevent those hooks from running. Obviously, administrators can choose to drop enabled hooks into the template directory, though, _and_ it is also possible to override `core.hooksPath`, in which case the new check needs to be disabled. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
1 parent 584de0b
refspec.c
#include "cache.h"
#include "strvec.h"
#include "refs.h"
#include "refspec.h"
static struct refspec_item s_tag_refspec = {
.force = 0,
.pattern = 1,
.matching = 0,
.exact_sha1 = 0,
.negative = 0,
.src = "refs/tags/*",
.dst = "refs/tags/*",
};
/* See TAG_REFSPEC for the string version */
const struct refspec_item *tag_refspec = &s_tag_refspec;
/*
* Parses the provided refspec 'refspec' and populates the refspec_item 'item'.
* Returns 1 if successful and 0 if the refspec is invalid.
*/
static int parse_refspec(struct refspec_item *item, const char *refspec, int fetch)
{
size_t llen;
int is_glob;
const char *lhs, *rhs;
int flags;
is_glob = 0;
lhs = refspec;
if (*lhs == '+') {
item->force = 1;
lhs++;
} else if (*lhs == '^') {
item->negative = 1;
lhs++;
}
rhs = strrchr(lhs, ':');
/* negative refspecs only have one side */
if (item->negative && rhs)
return 0;
/*
* Before going on, special case ":" (or "+:") as a refspec
* for pushing matching refs.
*/
if (!fetch && rhs == lhs && rhs[1] == '\0') {
item->matching = 1;
return 1;
}
if (rhs) {
size_t rlen = strlen(++rhs);
is_glob = (1 <= rlen && strchr(rhs, '*'));
item->dst = xstrndup(rhs, rlen);
} else {
item->dst = NULL;
}
llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
if (1 <= llen && memchr(lhs, '*', llen)) {
if ((rhs && !is_glob) || (!rhs && !item->negative && fetch))
return 0;
is_glob = 1;
} else if (rhs && is_glob) {
return 0;
}
item->pattern = is_glob;
if (llen == 1 && *lhs == '@')
item->src = xstrdup("HEAD");
else
item->src = xstrndup(lhs, llen);
flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
if (item->negative) {
struct object_id unused;
/*
* Negative refspecs only have a LHS, which indicates a ref
* (or pattern of refs) to exclude from other matches. This
* can either be a simple ref, or a glob pattern. Exact sha1
* match is not currently supported.
*/
if (!*item->src)
return 0; /* negative refspecs must not be empty */
else if (llen == the_hash_algo->hexsz && !get_oid_hex(item->src, &unused))
return 0; /* negative refpsecs cannot be exact sha1 */
else if (!check_refname_format(item->src, flags))
; /* valid looking ref is ok */
else
return 0;
/* the other rules below do not apply to negative refspecs */
return 1;
}
if (fetch) {
struct object_id unused;
/* LHS */
if (!*item->src)
; /* empty is ok; it means "HEAD" */
else if (llen == the_hash_algo->hexsz && !get_oid_hex(item->src, &unused))
item->exact_sha1 = 1; /* ok */
else if (!check_refname_format(item->src, flags))
; /* valid looking ref is ok */
else
return 0;
/* RHS */
if (!item->dst)
; /* missing is ok; it is the same as empty */
else if (!*item->dst)
; /* empty is ok; it means "do not store" */
else if (!check_refname_format(item->dst, flags))
; /* valid looking ref is ok */
else
return 0;
} else {
/*
* LHS
* - empty is allowed; it means delete.
* - when wildcarded, it must be a valid looking ref.
* - otherwise, it must be an extended SHA-1, but
* there is no existing way to validate this.
*/
if (!*item->src)
; /* empty is ok */
else if (is_glob) {
if (check_refname_format(item->src, flags))
return 0;
}
else
; /* anything goes, for now */
/*
* RHS
* - missing is allowed, but LHS then must be a
* valid looking ref.
* - empty is not allowed.
* - otherwise it must be a valid looking ref.
*/
if (!item->dst) {
if (check_refname_format(item->src, flags))
return 0;
} else if (!*item->dst) {
return 0;
} else {
if (check_refname_format(item->dst, flags))
return 0;
}
}
return 1;
}
int refspec_item_init(struct refspec_item *item, const char *refspec, int fetch)
{
memset(item, 0, sizeof(*item));
return parse_refspec(item, refspec, fetch);
}
void refspec_item_init_or_die(struct refspec_item *item, const char *refspec,
int fetch)
{
if (!refspec_item_init(item, refspec, fetch))
die(_("invalid refspec '%s'"), refspec);
}
void refspec_item_clear(struct refspec_item *item)
{
FREE_AND_NULL(item->src);
FREE_AND_NULL(item->dst);
item->force = 0;
item->pattern = 0;
item->matching = 0;
item->exact_sha1 = 0;
}
void refspec_init(struct refspec *rs, int fetch)
{
memset(rs, 0, sizeof(*rs));
rs->fetch = fetch;
}
static void refspec_append_nodup(struct refspec *rs, char *refspec)
{
struct refspec_item item;
refspec_item_init_or_die(&item, refspec, rs->fetch);
ALLOC_GROW(rs->items, rs->nr + 1, rs->alloc);
rs->items[rs->nr++] = item;
ALLOC_GROW(rs->raw, rs->raw_nr + 1, rs->raw_alloc);
rs->raw[rs->raw_nr++] = refspec;
}
void refspec_append(struct refspec *rs, const char *refspec)
{
refspec_append_nodup(rs, xstrdup(refspec));
}
void refspec_appendf(struct refspec *rs, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
refspec_append_nodup(rs, xstrvfmt(fmt, ap));
va_end(ap);
}
void refspec_appendn(struct refspec *rs, const char **refspecs, int nr)
{
int i;
for (i = 0; i < nr; i++)
refspec_append(rs, refspecs[i]);
}
void refspec_clear(struct refspec *rs)
{
int i;
for (i = 0; i < rs->nr; i++)
refspec_item_clear(&rs->items[i]);
FREE_AND_NULL(rs->items);
rs->alloc = 0;
rs->nr = 0;
for (i = 0; i < rs->raw_nr; i++)
free((char *)rs->raw[i]);
FREE_AND_NULL(rs->raw);
rs->raw_alloc = 0;
rs->raw_nr = 0;
rs->fetch = 0;
}
int valid_fetch_refspec(const char *fetch_refspec_str)
{
struct refspec_item refspec;
int ret = refspec_item_init(&refspec, fetch_refspec_str, REFSPEC_FETCH);
refspec_item_clear(&refspec);
return ret;
}
int valid_remote_name(const char *name)
{
int result;
struct strbuf refspec = STRBUF_INIT;
strbuf_addf(&refspec, "refs/heads/test:refs/remotes/%s/test", name);
result = valid_fetch_refspec(refspec.buf);
strbuf_release(&refspec);
return result;
}
void refspec_ref_prefixes(const struct refspec *rs,
struct strvec *ref_prefixes)
{
int i;
for (i = 0; i < rs->nr; i++) {
const struct refspec_item *item = &rs->items[i];
const char *prefix = NULL;
if (item->exact_sha1 || item->negative)
continue;
if (rs->fetch == REFSPEC_FETCH)
prefix = item->src;
else if (item->dst)
prefix = item->dst;
else if (item->src && !item->exact_sha1)
prefix = item->src;
if (!prefix)
continue;
if (item->pattern) {
const char *glob = strchr(prefix, '*');
strvec_pushf(ref_prefixes, "%.*s",
(int)(glob - prefix),
prefix);
} else {
expand_ref_prefix(ref_prefixes, prefix);
}
}
}
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...