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-rw-r--r--package/uhttpd/src/uhttpd-utils.c42
1 files changed, 27 insertions, 15 deletions
diff --git a/package/uhttpd/src/uhttpd-utils.c b/package/uhttpd/src/uhttpd-utils.c
index 1073f3bb3..1dac33db0 100644
--- a/package/uhttpd/src/uhttpd-utils.c
+++ b/package/uhttpd/src/uhttpd-utils.c
@@ -307,7 +307,7 @@ int uh_http_send(
/* blen is the size of buf; slen is the length of src. The input-string need
** not be, and the output string will not be, null-terminated. Returns the
-** length of the decoded string. */
+** length of the decoded string, -1 on buffer overflow, -2 on malformed string. */
int uh_urldecode(char *buf, int blen, const char *src, int slen)
{
int i;
@@ -329,7 +329,15 @@ int uh_urldecode(char *buf, int blen, const char *src, int slen)
}
else
{
- buf[len++] = '%';
+ /* Encoding error: it's hard to think of a
+ ** scenario in which returning an incorrect
+ ** 'decoding' of the malformed string is
+ ** preferable to signaling an error condition. */
+ #if 0 /* WORSE_IS_BETTER */
+ buf[len++] = '%';
+ #else
+ return -2;
+ #endif
}
}
else
@@ -338,12 +346,12 @@ int uh_urldecode(char *buf, int blen, const char *src, int slen)
}
}
- return len;
+ return (i == slen) ? len : -1;
}
/* blen is the size of buf; slen is the length of src. The input-string need
** not be, and the output string will not be, null-terminated. Returns the
-** length of the encoded string. */
+** length of the encoded string, or -1 on error (buffer overflow) */
int uh_urlencode(char *buf, int blen, const char *src, int slen)
{
int i;
@@ -365,11 +373,12 @@ int uh_urlencode(char *buf, int blen, const char *src, int slen)
}
else
{
+ len = -1;
break;
}
}
- return len;
+ return (i == slen) ? len : -1;
}
int uh_b64decode(char *buf, int blen, const unsigned char *src, int slen)
@@ -495,6 +504,9 @@ static char * canonpath(const char *path, char *path_resolved)
return NULL;
}
+/* Returns NULL on error.
+** NB: improperly encoded URL should give client 400 [Bad Syntax]; returning
+** NULL here causes 404 [Not Found], but that's not too unreasonable. */
struct path_info * uh_path_lookup(struct client *cl, const char *url)
{
static char path_phys[PATH_MAX];
@@ -530,21 +542,21 @@ struct path_info * uh_path_lookup(struct client *cl, const char *url)
/* urldecode component w/o query */
if( pathptr > url )
- uh_urldecode(
- &buffer[strlen(docroot)],
- sizeof(buffer) - strlen(docroot) - 1,
- url, pathptr - url
- );
+ if ( uh_urldecode(
+ &buffer[strlen(docroot)],
+ sizeof(buffer) - strlen(docroot) - 1,
+ url, pathptr - url ) < 0 )
+ return NULL; /* bad URL */
}
/* no query string, decode all of url */
else
{
- uh_urldecode(
- &buffer[strlen(docroot)],
- sizeof(buffer) - strlen(docroot) - 1,
- url, strlen(url)
- );
+ if ( uh_urldecode(
+ &buffer[strlen(docroot)],
+ sizeof(buffer) - strlen(docroot) - 1,
+ url, strlen(url) ) < 0 )
+ return NULL; /* bad URL */
}
/* create canon path */