Mercurial > hg > nginx
changeset 7880:dfd8dfb436e5
Core: escaping of chars not allowed in URIs per RFC 3986.
Per RFC 3986 only the following characters are allowed in URIs unescaped:
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
/ "*" / "+" / "," / ";" / "="
And "%" can appear as a part of escaping itself. The following
characters are not allowed and need to be escaped: %00-%1F, %7F-%FF,
" ", """, "<", ">", "\", "^", "`", "{", "|", "}".
Not escaping ">" is known to cause problems at least with MS Exchange (see
http://nginx.org/pipermail/nginx-ru/2010-January/031261.html) and in
Tomcat (ticket #2191).
The patch adds escaping of the following chars in all URI parts: """, "<",
">", "\", "^", "`", "{", "|", "}". Note that comments are mostly preserved
to outline important characters being escaped.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Mon, 28 Jun 2021 18:01:11 +0300 |
| parents | b7407334c60d |
| children | 52338ddf9e2f |
| files | src/core/ngx_string.c |
| diffstat | 1 files changed, 29 insertions(+), 16 deletions(-) [+] |
line wrap: on
line diff
--- a/src/core/ngx_string.c +++ b/src/core/ngx_string.c @@ -1493,19 +1493,32 @@ ngx_escape_uri(u_char *dst, u_char *src, uint32_t *escape; static u_char hex[] = "0123456789ABCDEF"; - /* " ", "#", "%", "?", %00-%1F, %7F-%FF */ + /* + * Per RFC 3986 only the following chars are allowed in URIs unescaped: + * + * unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~" + * gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@" + * sub-delims = "!" / "$" / "&" / "'" / "(" / ")" + * / "*" / "+" / "," / ";" / "=" + * + * And "%" can appear as a part of escaping itself. The following + * characters are not allowed and need to be escaped: %00-%1F, %7F-%FF, + * " ", """, "<", ">", "\", "^", "`", "{", "|", "}". + */ + + /* " ", "#", "%", "?", not allowed */ static uint32_t uri[] = { 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ /* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */ - 0x80000029, /* 1000 0000 0000 0000 0000 0000 0010 1001 */ + 0xd000002d, /* 1101 0000 0000 0000 0000 0000 0010 1101 */ /* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */ - 0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */ + 0x50000000, /* 0101 0000 0000 0000 0000 0000 0000 0000 */ /* ~}| {zyx wvut srqp onml kjih gfed cba` */ - 0x80000000, /* 1000 0000 0000 0000 0000 0000 0000 0000 */ + 0xb8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ @@ -1513,19 +1526,19 @@ ngx_escape_uri(u_char *dst, u_char *src, 0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */ }; - /* " ", "#", "%", "&", "+", ";", "?", %00-%1F, %7F-%FF */ + /* " ", "#", "%", "&", "+", ";", "?", not allowed */ static uint32_t args[] = { 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ /* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */ - 0x88000869, /* 1000 1000 0000 0000 0000 1000 0110 1001 */ + 0xd800086d, /* 1101 1000 0000 0000 0000 1000 0110 1101 */ /* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */ - 0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */ + 0x50000000, /* 0101 0000 0000 0000 0000 0000 0000 0000 */ /* ~}| {zyx wvut srqp onml kjih gfed cba` */ - 0x80000000, /* 1000 0000 0000 0000 0000 0000 0000 0000 */ + 0xb8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ @@ -1553,19 +1566,19 @@ ngx_escape_uri(u_char *dst, u_char *src, 0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */ }; - /* " ", "#", """, "%", "'", %00-%1F, %7F-%FF */ + /* " ", "#", """, "%", "'", not allowed */ static uint32_t html[] = { 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ /* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */ - 0x000000ad, /* 0000 0000 0000 0000 0000 0000 1010 1101 */ + 0x500000ad, /* 0101 0000 0000 0000 0000 0000 1010 1101 */ /* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */ - 0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */ + 0x50000000, /* 0101 0000 0000 0000 0000 0000 0000 0000 */ /* ~}| {zyx wvut srqp onml kjih gfed cba` */ - 0x80000000, /* 1000 0000 0000 0000 0000 0000 0000 0000 */ + 0xb8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ @@ -1573,19 +1586,19 @@ ngx_escape_uri(u_char *dst, u_char *src, 0xffffffff /* 1111 1111 1111 1111 1111 1111 1111 1111 */ }; - /* " ", """, "'", %00-%1F, %7F-%FF */ + /* " ", """, "'", not allowed */ static uint32_t refresh[] = { 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ /* ?>=< ;:98 7654 3210 /.-, +*)( '&%$ #"! */ - 0x00000085, /* 0000 0000 0000 0000 0000 0000 1000 0101 */ + 0x50000085, /* 0101 0000 0000 0000 0000 0000 1000 0101 */ /* _^]\ [ZYX WVUT SRQP ONML KJIH GFED CBA@ */ - 0x00000000, /* 0000 0000 0000 0000 0000 0000 0000 0000 */ + 0x50000000, /* 0101 0000 0000 0000 0000 0000 0000 0000 */ /* ~}| {zyx wvut srqp onml kjih gfed cba` */ - 0x80000000, /* 1000 0000 0000 0000 0000 0000 0000 0000 */ + 0xd8000001, /* 1011 1000 0000 0000 0000 0000 0000 0001 */ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */ 0xffffffff, /* 1111 1111 1111 1111 1111 1111 1111 1111 */