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bugfix: updated the check-uri-and-headers-safety patch.

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Thibault Charbonnier 2020-03-31 12:33:20 -07:00
parent 3875872801
commit 99ec14bfb2
1 changed files with 68 additions and 203 deletions
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271
patches/ngx_http_lua-0.10.15-check-uri-and-headers-safety.patch
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@ -1,112 +1,30 @@
From 881bf91da6853446398cebc1b2d6a01f8d7939d6 Mon Sep 17 00:00:00 2001
From: doujiang24 <doujiang24@gmail.com>
Date: Sat, 13 Jul 2019 13:06:33 +0800
Subject: [PATCH] bugfix: ensured arguments of APIs mutating response headers
do not contain '\r' and '\n' characters.
Signed-off-by: Thibault Charbonnier <thibaultcha@me.com>
---
src/ngx_http_lua_control.c | 2 ++
src/ngx_http_lua_headers_out.c | 4 ++++
src/ngx_http_lua_util.h | 15 +++++++++++++++
3 files changed, 21 insertions(+)
diff --git a/src/ngx_http_lua_control.c b/src/ngx_http_lua_control.c
index 5cd1d64c..9c523015 100644
index 5cd1d64c..d8022cc5 100644
--- a/src/ngx_http_lua_control.c
+++ b/src/ngx_http_lua_control.c
@@ -248,6 +248,8 @@ ngx_http_lua_ngx_redirect(lua_State *L)
@@ -248,6 +248,10 @@ ngx_http_lua_ngx_redirect(lua_State *L)
"the headers");
}
+ len = ngx_http_lua_safe_header_value_len(p, len);
+ if (ngx_http_lua_check_unsafe_string(r, p, len, "redirect uri") != NGX_OK) {
+ return luaL_error(L, "attempt to set unsafe redirect uri");
+ }
+
uri = ngx_palloc(r->pool, len);
if (uri == NULL) {
return luaL_error(L, "no memory");
diff --git a/src/ngx_http_lua_headers_out.c b/src/ngx_http_lua_headers_out.c
index cf94bd04..4b59721e 100644
--- a/src/ngx_http_lua_headers_out.c
+++ b/src/ngx_http_lua_headers_out.c
@@ -491,6 +491,10 @@ ngx_http_lua_set_output_header(ngx_http_request_t *r, ngx_http_lua_ctx_t *ctx,
dd("set header value: %.*s", (int) value.len, value.data);
+ key.len = ngx_http_lua_safe_header_value_len(key.data, key.len);
+
+ value.len = ngx_http_lua_safe_header_value_len(value.data, value.len);
+
hv.hash = ngx_hash_key_lc(key.data, key.len);
hv.key = key;
diff --git a/src/ngx_http_lua_util.h b/src/ngx_http_lua_util.h
index f08f4815..179ff3aa 100644
--- a/src/ngx_http_lua_util.h
+++ b/src/ngx_http_lua_util.h
@@ -260,6 +260,21 @@ void ngx_http_lua_set_sa_restart(ngx_log_t *log);
}
+static ngx_inline size_t
+ngx_http_lua_safe_header_value_len(u_char *str, size_t len)
+{
+ size_t i;
+
+ for (i = 0; i < len; i++, str++) {
+ if (*str == '\r' || *str == '\n') {
+ return i;
+ }
+ }
+
+ return len;
+}
+
+
static ngx_inline void
ngx_http_lua_init_ctx(ngx_http_request_t *r, ngx_http_lua_ctx_t *ctx)
{
From 38f587a35ef72b8cbb50114797fa875307ff0bfe Mon Sep 17 00:00:00 2001
From: doujiang <doujiang24@gmail.com>
Date: Fri, 20 Mar 2020 05:17:20 +0800
Subject: [PATCH] bugfix: ensured arguments of APIs mutating uri or
request/response headers do not contain unsafe characters. (#1654)
Signed-off-by: Thibault Charbonnier <thibaultcha@me.com>
---
src/ngx_http_lua_control.c | 4 +-
src/ngx_http_lua_headers_in.c | 6 ++
src/ngx_http_lua_headers_out.c | 8 ++-
src/ngx_http_lua_uri.c | 59 ++++++++++++++++
src/ngx_http_lua_util.c | 119 +++++++++++++++++++++++++++++++++
src/ngx_http_lua_util.h | 17 +----
6 files changed, 195 insertions(+), 18 deletions(-)
diff --git a/src/ngx_http_lua_control.c b/src/ngx_http_lua_control.c
index 5ace1763..2fd3d174 100644
--- a/src/ngx_http_lua_control.c
+++ b/src/ngx_http_lua_control.c
@@ -239,7 +239,9 @@ ngx_http_lua_ngx_redirect(lua_State *L)
"the headers");
}
- len = ngx_http_lua_safe_header_value_len(p, len);
+ if (ngx_http_lua_check_header_safe(r, p, len) != NGX_OK) {
+ return luaL_error(L, "attempt to use unsafe uri");
+ }
uri = ngx_palloc(r->pool, len);
if (uri == NULL) {
diff --git a/src/ngx_http_lua_headers_in.c b/src/ngx_http_lua_headers_in.c
index 26739fa3..a284f028 100644
index c52cd13d..b8befc34 100644
--- a/src/ngx_http_lua_headers_in.c
+++ b/src/ngx_http_lua_headers_in.c
@@ -658,6 +658,12 @@ ngx_http_lua_set_input_header(ngx_http_request_t *r, ngx_str_t key,
@@ -664,6 +664,14 @@ ngx_http_lua_set_input_header(ngx_http_request_t *r, ngx_str_t key,
dd("set header value: %.*s", (int) value.len, value.data);
+ if (ngx_http_lua_check_header_safe(r, key.data, key.len) != NGX_OK
+ || ngx_http_lua_check_header_safe(r, value.data, value.len) != NGX_OK)
+ if (ngx_http_lua_check_unsafe_string(r, key.data, key.len,
+ "header name") != NGX_OK
+ || ngx_http_lua_check_unsafe_string(r, value.data, value.len,
+ "header value") != NGX_OK)
+ {
+ return NGX_ERROR;
+ }
@ -115,111 +33,50 @@ index 26739fa3..a284f028 100644
hv.key = key;
diff --git a/src/ngx_http_lua_headers_out.c b/src/ngx_http_lua_headers_out.c
index 659a89f4..87f114b8 100644
index cf94bd04..8cd36841 100644
--- a/src/ngx_http_lua_headers_out.c
+++ b/src/ngx_http_lua_headers_out.c
@@ -491,9 +491,11 @@ ngx_http_lua_set_output_header(ngx_http_request_t *r, ngx_http_lua_ctx_t *ctx,
@@ -491,6 +491,14 @@ ngx_http_lua_set_output_header(ngx_http_request_t *r, ngx_http_lua_ctx_t *ctx,
dd("set header value: %.*s", (int) value.len, value.data);
- key.len = ngx_http_lua_safe_header_value_len(key.data, key.len);
-
- value.len = ngx_http_lua_safe_header_value_len(value.data, value.len);
+ if (ngx_http_lua_check_header_safe(r, key.data, key.len) != NGX_OK
+ || ngx_http_lua_check_header_safe(r, value.data, value.len) != NGX_OK)
+ if (ngx_http_lua_check_unsafe_string(r, key.data, key.len,
+ "header name") != NGX_OK
+ || ngx_http_lua_check_unsafe_string(r, value.data, value.len,
+ "header value") != NGX_OK)
+ {
+ return NGX_ERROR;
+ }
+
hv.hash = ngx_hash_key_lc(key.data, key.len);
hv.key = key;
diff --git a/src/ngx_http_lua_uri.c b/src/ngx_http_lua_uri.c
index 3559b5c0..6818ba85 100644
index 3559b5c0..569cb502 100644
--- a/src/ngx_http_lua_uri.c
+++ b/src/ngx_http_lua_uri.c
@@ -16,6 +16,8 @@
static int ngx_http_lua_ngx_req_set_uri(lua_State *L);
+static ngx_int_t ngx_http_lua_check_uri_safe(ngx_http_request_t *r,
+ u_char *str, size_t len);
void
@@ -55,6 +57,10 @@ ngx_http_lua_ngx_req_set_uri(lua_State *L)
@@ -55,6 +55,10 @@ ngx_http_lua_ngx_req_set_uri(lua_State *L)
return luaL_error(L, "attempt to use zero-length uri");
}
+ if (ngx_http_lua_check_uri_safe(r, p, len) != NGX_OK) {
+ return luaL_error(L, "attempt to use unsafe uri");
+ if (ngx_http_lua_check_unsafe_string(r, p, len, "uri") != NGX_OK) {
+ return luaL_error(L, "attempt to set unsafe uri");
+ }
+
if (n == 2) {
luaL_checktype(L, 2, LUA_TBOOLEAN);
@@ -107,4 +113,57 @@ ngx_http_lua_ngx_req_set_uri(lua_State *L)
@@ -107,4 +111,5 @@ ngx_http_lua_ngx_req_set_uri(lua_State *L)
return 0;
}
+
+static ngx_inline ngx_int_t
+ngx_http_lua_check_uri_safe(ngx_http_request_t *r, u_char *str, size_t len)
+{
+ size_t i, buf_len;
+ u_char c;
+ u_char *buf, *src = str;
+
+ /* %00-%1F, " ", %7F */
+
+ static uint32_t unsafe[] = {
+ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */
+
+ /* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */
+ 0x00000001, /* 0000 0000 0000 0000 0000 0000 0000 0001 */
+
+ /* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */
+ 0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
+
+ /* ~}| {zyx wvut srqp onml kjih gfed cba` */
+ 0x80000000, /* 1000 0000 0000 0000 0000 0000 0000 0000 */
+
+ 0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
+ 0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
+ 0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */
+ 0x00000000 /* 0000 0000 0000 0000 0000 0000 0000 0000 */
+ };
+
+ for (i = 0; i < len; i++, str++) {
+ c = *str;
+ if (unsafe[c >> 5] & (1 << (c & 0x1f))) {
+ buf_len = ngx_http_lua_escape_log(NULL, src, len);
+ buf = ngx_palloc(r->pool, buf_len);
+ if (buf == NULL) {
+ return NGX_ERROR;
+ }
+
+ ngx_http_lua_escape_log(buf, src, len);
+
+ ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+ "unsafe byte \"0x%uxd\" in uri \"%*s\"",
+ (unsigned) c, buf_len, buf);
+
+ ngx_pfree(r->pool, buf);
+
+ return NGX_ERROR;
+ }
+ }
+
+ return NGX_OK;
+}
+
+
/* vi:set ft=c ts=4 sw=4 et fdm=marker: */
diff --git a/src/ngx_http_lua_util.c b/src/ngx_http_lua_util.c
index 074957b6..42bfb91e 100644
index c12262e8..515e14ad 100644
--- a/src/ngx_http_lua_util.c
+++ b/src/ngx_http_lua_util.c
@@ -4261,4 +4261,123 @@ ngx_http_lua_set_sa_restart(ngx_log_t *log)
@@ -4267,4 +4267,71 @@ ngx_http_lua_set_sa_restart(ngx_log_t *log)
#endif
@ -290,8 +147,43 @@ index 074957b6..42bfb91e 100644
+}
+
+
+ngx_inline ngx_int_t
+ngx_http_lua_check_header_safe(ngx_http_request_t *r, u_char *str, size_t len)
/* vi:set ft=c ts=4 sw=4 et fdm=marker: */
diff --git a/src/ngx_http_lua_util.h b/src/ngx_http_lua_util.h
index f08f4815..e1f4d75d 100644
--- a/src/ngx_http_lua_util.h
+++ b/src/ngx_http_lua_util.h
@@ -132,6 +132,12 @@ ngx_http_lua_ffi_check_context(ngx_http_lua_ctx_t *ctx, unsigned flags,
}
+#define ngx_http_lua_check_if_abortable(L, ctx) \
+ if ((ctx)->no_abort) { \
+ return luaL_error(L, "attempt to abort with pending subrequests"); \
+ }
+
+
#define ngx_http_lua_ssl_get_ctx(ssl_conn) \
SSL_get_ex_data(ssl_conn, ngx_http_lua_ssl_ctx_index)
@@ -254,10 +260,7 @@ void ngx_http_lua_cleanup_free(ngx_http_request_t *r,
void ngx_http_lua_set_sa_restart(ngx_log_t *log);
#endif
-#define ngx_http_lua_check_if_abortable(L, ctx) \
- if ((ctx)->no_abort) { \
- return luaL_error(L, "attempt to abort with pending subrequests"); \
- }
+size_t ngx_http_lua_escape_log(u_char *dst, u_char *src, size_t size);
static ngx_inline void
@@ -485,6 +488,59 @@ ngx_inet_get_port(struct sockaddr *sa)
#endif
+static ngx_inline ngx_int_t
+ngx_http_lua_check_unsafe_string(ngx_http_request_t *r, u_char *str, size_t len,
+ const char *name)
+{
+ size_t i, buf_len;
+ u_char c;
@ -329,8 +221,8 @@ index 074957b6..42bfb91e 100644
+ ngx_http_lua_escape_log(buf, src, len);
+
+ ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
+ "unsafe byte \"0x%uxd\" in header \"%*s\"",
+ (unsigned) c, buf_len, buf);
+ "unsafe byte \"0x%uxd\" in %s \"%*s\"",
+ (unsigned) c, name, buf_len, buf);
+
+ ngx_pfree(r->pool, buf);
+
@ -342,33 +234,6 @@ index 074957b6..42bfb91e 100644
+}
+
+
/* vi:set ft=c ts=4 sw=4 et fdm=marker: */
diff --git a/src/ngx_http_lua_util.h b/src/ngx_http_lua_util.h
index 13bfd273..7e62dccb 100644
--- a/src/ngx_http_lua_util.h
+++ b/src/ngx_http_lua_util.h
@@ -241,20 +241,9 @@ void ngx_http_lua_cleanup_free(ngx_http_request_t *r,
void ngx_http_lua_set_sa_restart(ngx_log_t *log);
#endif
extern ngx_uint_t ngx_http_lua_location_hash;
extern ngx_uint_t ngx_http_lua_content_length_hash;
-
-static ngx_inline size_t
-ngx_http_lua_safe_header_value_len(u_char *str, size_t len)
-{
- size_t i;
-
- for (i = 0; i < len; i++, str++) {
- if (*str == '\r' || *str == '\n') {
- return i;
- }
- }
-
- return len;
-}
+size_t ngx_http_lua_escape_log(u_char *dst, u_char *src, size_t size);
+ngx_int_t ngx_http_lua_check_header_safe(ngx_http_request_t *r, u_char *str,
+ size_t len);
static ngx_inline void