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Add nghttp2_check_header_value_rfc9113 

Add nghttp2_check_header_value_rfc9113 which verifies the additional
rule imposed by RFC 9113, section 8.2.1, that is a field value must
not start or end with 0x20(SPC) or 0x09(HTAB).

libnghttp2 uses this new function internally.
This commit is contained in:
Tatsuhiro Tsujikawa 2022-06-24 19:40:45 +09:00
parent af30e57c5e
commit 7f4c2f9ec3
10 changed files with 58 additions and 20 deletions
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1
doc/Makefile.am
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@ -30,6 +30,7 @@ APIDOCS= \
nghttp2_check_authority.rst \
nghttp2_check_header_name.rst \
nghttp2_check_header_value.rst \
nghttp2_check_header_value_rfc9113.rst \
nghttp2_check_method.rst \
nghttp2_check_path.rst \
nghttp2_hd_deflate_bound.rst \

14
lib/includes/nghttp2/nghttp2.h
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@ -5046,9 +5046,23 @@ NGHTTP2_EXTERN int nghttp2_check_header_name(const uint8_t *name, size_t len);
* Returns nonzero if HTTP header field value |value| of length |len|
* is valid according to
* http://tools.ietf.org/html/rfc7230#section-3.2
*
* This function is considered obsolete, and application should
* consider to use `nghttp2_check_header_value_rfc9113()` instead.
*/
NGHTTP2_EXTERN int nghttp2_check_header_value(const uint8_t *value, size_t len);
/**
* @function
*
* Returns nonzero if HTTP header field value |value| of length |len|
* is valid according to
* http://tools.ietf.org/html/rfc7230#section-3.2, plus
* https://datatracker.ietf.org/doc/html/rfc9113#section-8.2.1
*/
NGHTTP2_EXTERN int nghttp2_check_header_value_rfc9113(const uint8_t *value,
size_t len);
/**
* @function
*

13
lib/nghttp2_helper.c
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@ -507,6 +507,19 @@ int nghttp2_check_header_value(const uint8_t *value, size_t len) {
return 1;
}
int nghttp2_check_header_value_rfc9113(const uint8_t *value, size_t len) {
if (len == 0) {
return 1;
}
if (*value == ' ' || *value == '\t' || *(value + len - 1) == ' ' ||
*(value + len - 1) == '\t') {
return 0;
}
return nghttp2_check_header_value(value, len);
}
/* Generated by genmethodchartbl.py */
static char VALID_METHOD_CHARS[] = {
0 /* NUL */, 0 /* SOH */, 0 /* STX */, 0 /* ETX */,

4
lib/nghttp2_http.c
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@ -392,14 +392,14 @@ int nghttp2_http_on_header(nghttp2_session *session, nghttp2_stream *stream,
if (session->server || frame->hd.type == NGHTTP2_PUSH_PROMISE) {
rv = nghttp2_check_authority(nv->value->base, nv->value->len);
} else {
rv = nghttp2_check_header_value(nv->value->base, nv->value->len);
rv = nghttp2_check_header_value_rfc9113(nv->value->base, nv->value->len);
}
break;
case NGHTTP2_TOKEN__SCHEME:
rv = check_scheme(nv->value->base, nv->value->len);
break;
default:
rv = nghttp2_check_header_value(nv->value->base, nv->value->len);
rv = nghttp2_check_header_value_rfc9113(nv->value->base, nv->value->len);
}
if (rv == 0) {

11
src/http2.cc
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@ -693,17 +693,6 @@ StringRef rewrite_location_uri(BlockAllocator &balloc, const StringRef &uri,
return StringRef{iov.base, p};
}
int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
size_t valuelen) {
if (!nghttp2_check_header_name(name, namelen)) {
return 0;
}
if (!nghttp2_check_header_value(value, valuelen)) {
return 0;
}
return 1;
}
int parse_http_status_code(const StringRef &src) {
if (src.size() != 3) {
return -1;

6
src/http2.h
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@ -289,12 +289,6 @@ StringRef rewrite_location_uri(BlockAllocator &balloc, const StringRef &uri,
const StringRef &request_authority,
const StringRef &upstream_scheme);
// Checks the header name/value pair using nghttp2_check_header_name()
// and nghttp2_check_header_value(). If both function returns nonzero,
// this function returns nonzero.
int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
size_t valuelen);
// Returns parsed HTTP status code. Returns -1 on failure.
int parse_http_status_code(const StringRef &src);

2
src/shrpx_config.cc
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@ -379,7 +379,7 @@ HeaderRefs::value_type parse_header(BlockAllocator &balloc,
make_string_ref(balloc, StringRef{value, std::end(optarg)}));
if (!nghttp2_check_header_name(nv.name.byte(), nv.name.size()) ||
!nghttp2_check_header_value(nv.value.byte(), nv.value.size())) {
!nghttp2_check_header_value_rfc9113(nv.value.byte(), nv.value.size())) {
return {};
}

2
tests/main.c
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@ -431,6 +431,8 @@ int main(void) {
test_nghttp2_check_header_name) ||
!CU_add_test(pSuite, "check_header_value",
test_nghttp2_check_header_value) ||
!CU_add_test(pSuite, "check_header_value_rfc9113",
test_nghttp2_check_header_value_rfc9113) ||
!CU_add_test(pSuite, "bufs_add", test_nghttp2_bufs_add) ||
!CU_add_test(pSuite, "bufs_add_stack_buffer_overflow_bug",
test_nghttp2_bufs_add_stack_buffer_overflow_bug) ||

24
tests/nghttp2_helper_test.c
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@ -166,4 +166,28 @@ void test_nghttp2_check_header_value(void) {
CU_ASSERT(check_header_value(goodval));
CU_ASSERT(!check_header_value(badval1));
CU_ASSERT(!check_header_value(badval2));
CU_ASSERT(check_header_value(""));
CU_ASSERT(check_header_value(" "));
CU_ASSERT(check_header_value("\t"));
}
#define check_header_value_rfc9113(S) \
nghttp2_check_header_value_rfc9113((const uint8_t *)S, sizeof(S) - 1)
void test_nghttp2_check_header_value_rfc9113(void) {
uint8_t goodval[] = {'a', 'b', 0x80u, 'c', 0xffu, 'd'};
uint8_t badval1[] = {'a', 0x1fu, 'b'};
uint8_t badval2[] = {'a', 0x7fu, 'b'};
CU_ASSERT(check_header_value_rfc9113("!|}~"));
CU_ASSERT(!check_header_value_rfc9113(" !|}~"));
CU_ASSERT(!check_header_value_rfc9113("!|}~ "));
CU_ASSERT(!check_header_value_rfc9113("\t!|}~"));
CU_ASSERT(!check_header_value_rfc9113("!|}~\t"));
CU_ASSERT(check_header_value_rfc9113(goodval));
CU_ASSERT(!check_header_value_rfc9113(badval1));
CU_ASSERT(!check_header_value_rfc9113(badval2));
CU_ASSERT(check_header_value_rfc9113(""));
CU_ASSERT(!check_header_value_rfc9113(" "));
CU_ASSERT(!check_header_value_rfc9113("\t"));
}

1
tests/nghttp2_helper_test.h
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@ -32,5 +32,6 @@
void test_nghttp2_adjust_local_window_size(void);
void test_nghttp2_check_header_name(void);
void test_nghttp2_check_header_value(void);
void test_nghttp2_check_header_value_rfc9113(void);
#endif /* NGHTTP2_HELPER_TEST_H */