I have checked all the calls to ap_expr_parse_cmd() and it seems that
the change in the parser itself is not expected/needed.
Either ap_getword_conf() is implicit (parser called from an AP_TAKEn
or AP_TAKE_ARGV directive), or the caller (AP_RAW_ARGS directive) uses
it explicitly.
Hence that would cause a double unquoting...
There are some special cases though:
- ap_authz_providers as per this commit.
- mod_log_config, mod_log_debug, mod_headers have the expr=... syntax
which does not handle quoted strings;
- mod_rewrite has a special handling of quoted strings, including
RewriteCond expr ... (but it is consistent with all RewriteCond, so
guess it should be kept as is);
The patch proposed in [1] is I think the simplest way to handle the
case for *all* the ap_authz_providers.
Otherwise, we could introduce a new ap_expr_parse_cmd_conf() which
would handle quoted strings and advance the word pointer to the next
one (à la ap_getword_conf() where the word is an expression, either
quoted or until the end of line).
It would then be used by each ap_authz_provider's parser
implementation, and also by mod_{log_config,log_debug,headers} above
for the expr= case.
Something like:
Index: server/util_expr_eval.c
===================================================================
--- server/util_expr_eval.c (revision 1674695)
+++ server/util_expr_eval.c (working copy)
@@ -443,20 +443,31 @@ AP_DECLARE(const char *) ap_expr_parse(apr_pool_t
return NULL;
}
-AP_DECLARE(ap_expr_info_t*) ap_expr_parse_cmd_mi(const cmd_parms *cmd,
- const char *expr,
- unsigned int flags,
- const char **err,
- ap_expr_lookup_fn_t
*lookup_fn,
- int module_index)
+AP_DECLARE(ap_expr_info_t*) ap_expr_parse_cmd_conf(const cmd_parms *cmd,
+ const char **line,
+ unsigned int flags,
+ const char **err,
+ ap_expr_lookup_fn_t *lookup_fn,
+ int module_index)
{
+ const char *expr = *line;
+ apr_size_t len = strlen(expr);
ap_expr_info_t *info = apr_pcalloc(cmd->pool, sizeof(ap_expr_info_t));
+
info->filename = cmd->directive->filename;
info->line_number = cmd->directive->line_num;
info->flags = flags;
info->module_index = module_index;
+
+ if (len > 1 && (expr[0] == '"' || expr[0] == '\'')
+ && (expr[len - 1] == expr[0])) {
+ expr = ap_getword_conf(cmd->temp_pool, line);
+ }
+ else {
+ *line = expr + len;
+ }
+
*err = ap_expr_parse(cmd->pool, cmd->temp_pool, info, expr, lookup_fn);
-
if (*err)
return NULL;
@@ -463,6 +474,17 @@ AP_DECLARE(const char *) ap_expr_parse(apr_pool_t
return info;
}
+AP_DECLARE(ap_expr_info_t*) ap_expr_parse_cmd_mi(const cmd_parms *cmd,
+ const char *expr,
+ unsigned int flags,
+ const char **err,
+ ap_expr_lookup_fn_t
*lookup_fn,
+ int module_index)
+{
+ return ap_expr_parse_cmd_conf(cmd, &expr, flags, err,
+ lookup_fn, module_index);
+}
+
ap_expr_t *ap_expr_make(ap_expr_node_op_e op, const void *a1, const void *a2,
ap_expr_parse_ctx_t *ctx)
{
--
I prefer the patch from [1] though, because it is simpler and more
centralized for the ap_authz_providers case.
We could likewise use ap_getword_conf() explicitely for the expr=
cases, but they do not look critical to me, and "expr=..." (with
quotes around the whole) can still be used.
The only advantage I see for the new function would be if we have more
(and more) needs for it...
[1]
http://mail-archives.apache.org/mod_mbox/httpd-dev/201504.mbox/%3ccakq1svpnujfyccuk1qkcaqx6y50qjey-37kdqtkrruzb5hh...@mail.gmail.com%3E
On Fri, Apr 17, 2015 at 10:45 PM, Christophe JAILLET
<[email protected]> wrote:
> Hi,
>
> I would +1 for this solution which is, IMHO, much better.
> However, changing the parser itself would require checking the potential
> impact as it is used in many places.
>
> CJ
>
>
> Le 17/04/2015 13:15, Yann Ylavic a écrit :
>>
>> On Fri, Apr 17, 2015 at 11:54 AM, Yann Ylavic <[email protected]>
>> wrote:
>>>
>>> How about handling the case in the Require directive parser itself
>>> (add_authz_provider)?
>>
>> Or even maybe in the expr parser itself:
>>
>> Index: server/util_expr_eval.c
>> ===================================================================
>> --- server/util_expr_eval.c (revision 1674046)
>> +++ server/util_expr_eval.c (working copy)
>> @@ -455,6 +455,10 @@ AP_DECLARE(ap_expr_info_t*) ap_expr_parse_cmd_mi(c
>> info->line_number = cmd->directive->line_num;
>> info->flags = flags;
>> info->module_index = module_index;
>> + if (expr && (expr[0] == '"' || expr[0] == '\'') && (expr[1] != '\0')
>> + && (expr[strlen(expr) - 1] == expr[0])) {
>> + expr = ap_getword_conf(cmd->temp_pool, &expr);
>> + }
>> *err = ap_expr_parse(cmd->pool, cmd->temp_pool, info, expr,
>> lookup_fn);
>>
>> if (*err)
>> --
>>
>
