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cookies: Properly handle cookie path= equal to request path

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The code in cookies.c would arrange that c->path would always contain
a string ending in "/".  This may have been an attempt to make it
easier to do a proper subpath check in is_path_prefix.

Howver, the overall result is wrong in the case
   Set-Cookie: ....;path=/some/thing
and then later
   http://site.example.com/some/thing

c->path gets set to "/some/thing/" which doesn't pass the test in
is_path_prefix.

The precise required algorithm is described in RFC6265 5.1.4.  The
existing code fails to implement the first of the three bulleted
conditions at the end of 5.1.4.

The trailing "/" is actually not so helpful for this.  It is more
convenient to change is_path_prefix to do subpath matching directly:
we change it to insist that the supposed path prefix is a textual
prefix of the request path, *and* that this happens at a path segment
boundary: ie at '/' or end of string.[1]

Accordingly, we no longer add "/" to the cookie path.  When we strip
the final path element we strip the "/" too.  We still insert a "/" if
the path was empty.

[1] It is not 100% clear to me what "path" (URI_PATH) is but I think
it does not include any query parameters.  If I am wrong about that
then '?' should be tolerated too.

CC: Mark Wooding <mdw@distorted.org.uk>
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
This commit is contained in:
Ian Jackson 2020-05-02 19:40:06 +01:00 committed by أحمد المحمودي (Ahmed El-Mahmoudy)
parent eb46577ccb
commit 9bb3415811
1 changed files with 3 additions and 4 deletions
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7
src/cookies/cookies.c
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@ -356,8 +356,7 @@ set_cookie(struct uri *uri, unsigned char *str)
unsigned char *path_end;
case HEADER_PARAM_FOUND:
if (!path[0]
|| path[strlen(path) - 1] != '/')
if (!path[0])
add_to_strn(&path, "/");
if (path[0] != '/') {
@ -374,7 +373,7 @@ set_cookie(struct uri *uri, unsigned char *str)
path_end = strrchr((const char *)path, '/');
if (path_end)
path_end[1] = '\0';
path_end[0] = '\0';
break;
default: /* error */
@ -615,7 +614,7 @@ is_path_prefix(unsigned char *d, unsigned char *s)
if (dl > strlen(s)) return 0;
return !memcmp(d, s, dl);
return !memcmp(d, s, dl) && (s[dl] == '\0' || s[dl] == '/');
}