From 020456cb744b16f686d9220eb4b95a8e157c3485 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ren=C3=A9=20Scharfe?= Date: Fri, 9 Feb 2024 21:41:47 +0100 Subject: [PATCH] receive-pack: use find_commit_header() in check_nonce() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Use the public function find_commit_header() and remove find_header(), as it becomes unused. This is safe and appropriate because we pass the NUL-terminated payload buffer to check_nonce() instead of its start and length. The underlying strbuf push_cert cannot contain NULs, as it is built using strbuf_addstr(), only. We no longer need to call strlen(), as find_commit_header() returns the length of nonce already. Signed-off-by: René Scharfe Signed-off-by: Junio C Hamano --- builtin/receive-pack.c | 30 +++++++----------------------- 1 file changed, 7 insertions(+), 23 deletions(-) diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c index 8ebb3a872f..db65607485 100644 --- a/builtin/receive-pack.c +++ b/builtin/receive-pack.c @@ -593,21 +593,6 @@ static char *prepare_push_cert_nonce(const char *path, timestamp_t stamp) return strbuf_detach(&buf, NULL); } -static char *find_header(const char *msg, size_t len, const char *key, - const char **next_line) -{ - size_t out_len; - const char *val = find_header_mem(msg, len, key, &out_len); - - if (!val) - return NULL; - - if (next_line) - *next_line = val + out_len + 1; - - return xmemdupz(val, out_len); -} - /* * Return zero if a and b are equal up to n bytes and nonzero if they are not. * This operation is guaranteed to run in constant time to avoid leaking data. @@ -622,13 +607,14 @@ static int constant_memequal(const char *a, const char *b, size_t n) return res; } -static const char *check_nonce(const char *buf, size_t len) +static const char *check_nonce(const char *buf) { - char *nonce = find_header(buf, len, "nonce", NULL); + size_t noncelen; + const char *found = find_commit_header(buf, "nonce", &noncelen); + char *nonce = found ? xmemdupz(found, noncelen) : NULL; timestamp_t stamp, ostamp; char *bohmac, *expect = NULL; const char *retval = NONCE_BAD; - size_t noncelen; if (!nonce) { retval = NONCE_MISSING; @@ -670,7 +656,6 @@ static const char *check_nonce(const char *buf, size_t len) goto leave; } - noncelen = strlen(nonce); expect = prepare_push_cert_nonce(service_dir, stamp); if (noncelen != strlen(expect)) { /* This is not even the right size. */ @@ -732,9 +717,8 @@ static int check_cert_push_options(const struct string_list *push_options) buf = option + optionlen + 1; options_seen++; if (options_seen > push_options->nr - || strncmp(push_options->items[options_seen - 1].string, - option, optionlen) - || push_options->items[options_seen - 1].string[optionlen]) + || xstrncmpz(push_options->items[options_seen - 1].string, + option, optionlen)) return 0; } @@ -767,7 +751,7 @@ static void prepare_push_cert_sha1(struct child_process *proc) check_signature(&sigcheck, push_cert.buf + bogs, push_cert.len - bogs); - nonce_status = check_nonce(push_cert.buf, bogs); + nonce_status = check_nonce(sigcheck.payload); } if (!is_null_oid(&push_cert_oid)) { strvec_pushf(&proc->env, "GIT_PUSH_CERT=%s", -- 2.11.4.GIT