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curl/lib/cookie.c
Daniel Gustafsson 002f976cdc cookies: fix typo and expand comment 
Fix a typo in the sorting comment, and while in there elaborate slightly
on why creationtime can be used as a tiebreaker.
2021-06-03 13:02:09 +02:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
/***
RECEIVING COOKIE INFORMATION
============================
struct CookieInfo *Curl_cookie_init(struct Curl_easy *data,
const char *file, struct CookieInfo *inc, bool newsession);
Inits a cookie struct to store data in a local file. This is always
called before any cookies are set.
struct Cookie *Curl_cookie_add(struct Curl_easy *data,
struct CookieInfo *c, bool httpheader, char *lineptr,
const char *domain, const char *path);
The 'lineptr' parameter is a full "Set-cookie:" line as
received from a server.
The function need to replace previously stored lines that this new
line supersedes.
It may remove lines that are expired.
It should return an indication of success/error.
SENDING COOKIE INFORMATION
==========================
struct Cookies *Curl_cookie_getlist(struct CookieInfo *cookie,
char *host, char *path, bool secure);
For a given host and path, return a linked list of cookies that
the client should send to the server if used now. The secure
boolean informs the cookie if a secure connection is achieved or
not.
It shall only return cookies that haven't expired.
Example set of cookies:
Set-cookie: PRODUCTINFO=webxpress; domain=.fidelity.com; path=/; secure
Set-cookie: PERSONALIZE=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/ftgw; secure
Set-cookie: FidHist=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/; secure
Set-cookie: FidOrder=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/; secure
Set-cookie: DisPend=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/; secure
Set-cookie: FidDis=none;expires=Monday, 13-Jun-1988 03:04:55 GMT;
domain=.fidelity.com; path=/; secure
Set-cookie:
Session_Key@6791a9e0-901a-11d0-a1c8-9b012c88aa77=none;expires=Monday,
13-Jun-1988 03:04:55 GMT; domain=.fidelity.com; path=/; secure
****/
#include "curl_setup.h"
#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
#include "urldata.h"
#include "cookie.h"
#include "psl.h"
#include "strtok.h"
#include "sendf.h"
#include "slist.h"
#include "share.h"
#include "strtoofft.h"
#include "strcase.h"
#include "curl_get_line.h"
#include "curl_memrchr.h"
#include "parsedate.h"
#include "rand.h"
#include "rename.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
static void strstore(char **str, const char *newstr);
static void freecookie(struct Cookie *co)
{
free(co->expirestr);
free(co->domain);
free(co->path);
free(co->spath);
free(co->name);
free(co->value);
free(co->maxage);
free(co->version);
free(co);
}
static bool tailmatch(const char *cooke_domain, const char *hostname)
{
size_t cookie_domain_len = strlen(cooke_domain);
size_t hostname_len = strlen(hostname);
if(hostname_len < cookie_domain_len)
return FALSE;
if(!strcasecompare(cooke_domain, hostname + hostname_len-cookie_domain_len))
return FALSE;
/*
* A lead char of cookie_domain is not '.'.
* RFC6265 4.1.2.3. The Domain Attribute says:
* For example, if the value of the Domain attribute is
* "example.com", the user agent will include the cookie in the Cookie
* header when making HTTP requests to example.com, www.example.com, and
* www.corp.example.com.
*/
if(hostname_len == cookie_domain_len)
return TRUE;
if('.' == *(hostname + hostname_len - cookie_domain_len - 1))
return TRUE;
return FALSE;
}
/*
* matching cookie path and url path
* RFC6265 5.1.4 Paths and Path-Match
*/
static bool pathmatch(const char *cookie_path, const char *request_uri)
{
size_t cookie_path_len;
size_t uri_path_len;
char *uri_path = NULL;
char *pos;
bool ret = FALSE;
/* cookie_path must not have last '/' separator. ex: /sample */
cookie_path_len = strlen(cookie_path);
if(1 == cookie_path_len) {
/* cookie_path must be '/' */
return TRUE;
}
uri_path = strdup(request_uri);
if(!uri_path)
return FALSE;
pos = strchr(uri_path, '?');
if(pos)
*pos = 0x0;
/* #-fragments are already cut off! */
if(0 == strlen(uri_path) || uri_path[0] != '/') {
strstore(&uri_path, "/");
if(!uri_path)
return FALSE;
}
/*
* here, RFC6265 5.1.4 says
* 4. Output the characters of the uri-path from the first character up
* to, but not including, the right-most %x2F ("/").
* but URL path /hoge?fuga=xxx means /hoge/index.cgi?fuga=xxx in some site
* without redirect.
* Ignore this algorithm because /hoge is uri path for this case
* (uri path is not /).
*/
uri_path_len = strlen(uri_path);
if(uri_path_len < cookie_path_len) {
ret = FALSE;
goto pathmatched;
}
/* not using checkprefix() because matching should be case-sensitive */
if(strncmp(cookie_path, uri_path, cookie_path_len)) {
ret = FALSE;
goto pathmatched;
}
/* The cookie-path and the uri-path are identical. */
if(cookie_path_len == uri_path_len) {
ret = TRUE;
goto pathmatched;
}
/* here, cookie_path_len < uri_path_len */
if(uri_path[cookie_path_len] == '/') {
ret = TRUE;
goto pathmatched;
}
ret = FALSE;
pathmatched:
free(uri_path);
return ret;
}
/*
* Return the top-level domain, for optimal hashing.
*/
static const char *get_top_domain(const char * const domain, size_t *outlen)
{
size_t len = 0;
const char *first = NULL, *last;
if(domain) {
len = strlen(domain);
last = memrchr(domain, '.', len);
if(last) {
first = memrchr(domain, '.', (last - domain));
if(first)
len -= (++first - domain);
}
}
if(outlen)
*outlen = len;
return first? first: domain;
}
/* Avoid C1001, an "internal error" with MSVC14 */
#if defined(_MSC_VER) && (_MSC_VER == 1900)
#pragma optimize("", off)
#endif
/*
* A case-insensitive hash for the cookie domains.
*/
static size_t cookie_hash_domain(const char *domain, const size_t len)
{
const char *end = domain + len;
size_t h = 5381;
while(domain < end) {
h += h << 5;
h ^= Curl_raw_toupper(*domain++);
}
return (h % COOKIE_HASH_SIZE);
}
#if defined(_MSC_VER) && (_MSC_VER == 1900)
#pragma optimize("", on)
#endif
/*
* Hash this domain.
*/
static size_t cookiehash(const char * const domain)
{
const char *top;
size_t len;
if(!domain || Curl_host_is_ipnum(domain))
return 0;
top = get_top_domain(domain, &len);
return cookie_hash_domain(top, len);
}
/*
* cookie path sanitize
*/
static char *sanitize_cookie_path(const char *cookie_path)
{
size_t len;
char *new_path = strdup(cookie_path);
if(!new_path)
return NULL;
/* some stupid site sends path attribute with '"'. */
len = strlen(new_path);
if(new_path[0] == '\"') {
memmove((void *)new_path, (const void *)(new_path + 1), len);
len--;
}
if(len && (new_path[len - 1] == '\"')) {
new_path[len - 1] = 0x0;
len--;
}
/* RFC6265 5.2.4 The Path Attribute */
if(new_path[0] != '/') {
/* Let cookie-path be the default-path. */
strstore(&new_path, "/");
return new_path;
}
/* convert /hoge/ to /hoge */
if(len && new_path[len - 1] == '/') {
new_path[len - 1] = 0x0;
}
return new_path;
}
/*
* Load cookies from all given cookie files (CURLOPT_COOKIEFILE).
*
* NOTE: OOM or cookie parsing failures are ignored.
*/
void Curl_cookie_loadfiles(struct Curl_easy *data)
{
struct curl_slist *list = data->state.cookielist;
if(list) {
Curl_share_lock(data, CURL_LOCK_DATA_COOKIE, CURL_LOCK_ACCESS_SINGLE);
while(list) {
struct CookieInfo *newcookies = Curl_cookie_init(data,
list->data,
data->cookies,
data->set.cookiesession);
if(!newcookies)
/*
* Failure may be due to OOM or a bad cookie; both are ignored
* but only the first should be
*/
infof(data, "ignoring failed cookie_init for %s\n", list->data);
else
data->cookies = newcookies;
list = list->next;
}
curl_slist_free_all(data->state.cookielist); /* clean up list */
data->state.cookielist = NULL; /* don't do this again! */
Curl_share_unlock(data, CURL_LOCK_DATA_COOKIE);
}
}
/*
* strstore
*
* A thin wrapper around strdup which ensures that any memory allocated at
* *str will be freed before the string allocated by strdup is stored there.
* The intended usecase is repeated assignments to the same variable during
* parsing in a last-wins scenario. The caller is responsible for checking
* for OOM errors.
*/
static void strstore(char **str, const char *newstr)
{
free(*str);
*str = strdup(newstr);
}
/*
* remove_expired
*
* Remove expired cookies from the hash by inspecting the expires timestamp on
* each cookie in the hash, freeing and deleting any where the timestamp is in
* the past.
*/
static void remove_expired(struct CookieInfo *cookies)
{
struct Cookie *co, *nx;
curl_off_t now = (curl_off_t)time(NULL);
unsigned int i;
for(i = 0; i < COOKIE_HASH_SIZE; i++) {
struct Cookie *pv = NULL;
co = cookies->cookies[i];
while(co) {
nx = co->next;
if(co->expires && co->expires < now) {
if(!pv) {
cookies->cookies[i] = co->next;
}
else {
pv->next = co->next;
}
cookies->numcookies--;
freecookie(co);
}
else {
pv = co;
}
co = nx;
}
}
}
/* Make sure domain contains a dot or is localhost. */
static bool bad_domain(const char *domain)
{
return !strchr(domain, '.') && !strcasecompare(domain, "localhost");
}
/*
* Curl_cookie_add
*
* Add a single cookie line to the cookie keeping object. Be aware that
* sometimes we get an IP-only host name, and that might also be a numerical
* IPv6 address.
*
* Returns NULL on out of memory or invalid cookie. This is suboptimal,
* as they should be treated separately.
*/
struct Cookie *
Curl_cookie_add(struct Curl_easy *data,
/*
* The 'data' pointer here may be NULL at times, and thus
* must only be used very carefully for things that can deal
* with data being NULL. Such as infof() and similar
*/
struct CookieInfo *c,
bool httpheader, /* TRUE if HTTP header-style line */
bool noexpire, /* if TRUE, skip remove_expired() */
char *lineptr, /* first character of the line */
const char *domain, /* default domain */
const char *path, /* full path used when this cookie is set,
used to get default path for the cookie
unless set */
bool secure) /* TRUE if connection is over secure origin */
{
struct Cookie *clist;
struct Cookie *co;
struct Cookie *lastc = NULL;
time_t now = time(NULL);
bool replace_old = FALSE;
bool badcookie = FALSE; /* cookies are good by default. mmmmm yummy */
size_t myhash;
#ifdef CURL_DISABLE_VERBOSE_STRINGS
(void)data;
#endif
/* First, alloc and init a new struct for it */
co = calloc(1, sizeof(struct Cookie));
if(!co)
return NULL; /* bail out if we're this low on memory */
if(httpheader) {
/* This line was read off a HTTP-header */
char name[MAX_NAME];
char what[MAX_NAME];
const char *ptr;
const char *semiptr;
size_t linelength = strlen(lineptr);
if(linelength > MAX_COOKIE_LINE) {
/* discard overly long lines at once */
free(co);
return NULL;
}
semiptr = strchr(lineptr, ';'); /* first, find a semicolon */
while(*lineptr && ISBLANK(*lineptr))
lineptr++;
ptr = lineptr;
do {
/* we have a <what>=<this> pair or a stand-alone word here */
name[0] = what[0] = 0; /* init the buffers */
if(1 <= sscanf(ptr, "%" MAX_NAME_TXT "[^;\r\n=] =%"
MAX_NAME_TXT "[^;\r\n]",
name, what)) {
/*
* Use strstore() below to properly deal with received cookie
* headers that have the same string property set more than once,
* and then we use the last one.
*/
const char *whatptr;
bool done = FALSE;
bool sep;
size_t len = strlen(what);
size_t nlen = strlen(name);
const char *endofn = &ptr[ nlen ];
/*
* Check for too long individual name or contents, or too long
* combination of name + contents. Chrome and Firefox support 4095 or
* 4096 bytes combo
*/
if(nlen >= (MAX_NAME-1) || len >= (MAX_NAME-1) ||
((nlen + len) > MAX_NAME)) {
freecookie(co);
infof(data, "oversized cookie dropped, name/val %zu + %zu bytes\n",
nlen, len);
return NULL;
}
/* name ends with a '=' ? */
sep = (*endofn == '=')?TRUE:FALSE;
if(nlen) {
endofn--; /* move to the last character */
if(ISBLANK(*endofn)) {
/* skip trailing spaces in name */
while(*endofn && ISBLANK(*endofn) && nlen) {
endofn--;
nlen--;
}
name[nlen] = 0; /* new end of name */
}
}
/* Strip off trailing whitespace from the 'what' */
while(len && ISBLANK(what[len-1])) {
what[len-1] = 0;
len--;
}
/* Skip leading whitespace from the 'what' */
whatptr = what;
while(*whatptr && ISBLANK(*whatptr))
whatptr++;
/*
* Check if we have a reserved prefix set before anything else, as we
* otherwise have to test for the prefix in both the cookie name and
* "the rest". Prefixes must start with '__' and end with a '-', so
* only test for names where that can possibly be true.
*/
if(nlen > 3 && name[0] == '_' && name[1] == '_') {
if(!strncmp("__Secure-", name, 9))
co->prefix |= COOKIE_PREFIX__SECURE;
else if(!strncmp("__Host-", name, 7))
co->prefix |= COOKIE_PREFIX__HOST;
}
if(!co->name) {
/* The very first name/value pair is the actual cookie name */
if(!sep) {
/* Bad name/value pair. */
badcookie = TRUE;
break;
}
co->name = strdup(name);
co->value = strdup(whatptr);
done = TRUE;
if(!co->name || !co->value) {
badcookie = TRUE;
break;
}
}
else if(!len) {
/*
* this was a "<name>=" with no content, and we must allow
* 'secure' and 'httponly' specified this weirdly
*/
done = TRUE;
/*
* secure cookies are only allowed to be set when the connection is
* using a secure protocol, or when the cookie is being set by
* reading from file
*/
if(strcasecompare("secure", name)) {
if(secure || !c->running) {
co->secure = TRUE;
}
else {
badcookie = TRUE;
break;
}
}
else if(strcasecompare("httponly", name))
co->httponly = TRUE;
else if(sep)
/* there was a '=' so we're not done parsing this field */
done = FALSE;
}
if(done)
;
else if(strcasecompare("path", name)) {
strstore(&co->path, whatptr);
if(!co->path) {
badcookie = TRUE; /* out of memory bad */
break;
}
free(co->spath); /* if this is set again */
co->spath = sanitize_cookie_path(co->path);
if(!co->spath) {
badcookie = TRUE; /* out of memory bad */
break;
}
}
else if(strcasecompare("domain", name)) {
bool is_ip;
/*
* Now, we make sure that our host is within the given domain, or
* the given domain is not valid and thus cannot be set.
*/
if('.' == whatptr[0])
whatptr++; /* ignore preceding dot */
#ifndef USE_LIBPSL
/*
* Without PSL we don't know when the incoming cookie is set on a
* TLD or otherwise "protected" suffix. To reduce risk, we require a
* dot OR the exact host name being "localhost".
*/
if(bad_domain(whatptr))
domain = ":";
#endif
is_ip = Curl_host_is_ipnum(domain ? domain : whatptr);
if(!domain
|| (is_ip && !strcmp(whatptr, domain))
|| (!is_ip && tailmatch(whatptr, domain))) {
strstore(&co->domain, whatptr);
if(!co->domain) {
badcookie = TRUE;
break;
}
if(!is_ip)
co->tailmatch = TRUE; /* we always do that if the domain name was
given */
}
else {
/*
* We did not get a tailmatch and then the attempted set domain is
* not a domain to which the current host belongs. Mark as bad.
*/
badcookie = TRUE;
infof(data, "skipped cookie with bad tailmatch domain: %s\n",
whatptr);
}
}
else if(strcasecompare("version", name)) {
strstore(&co->version, whatptr);
if(!co->version) {
badcookie = TRUE;
break;
}
}
else if(strcasecompare("max-age", name)) {
/*
* Defined in RFC2109:
*
* Optional. The Max-Age attribute defines the lifetime of the
* cookie, in seconds. The delta-seconds value is a decimal non-
* negative integer. After delta-seconds seconds elapse, the
* client should discard the cookie. A value of zero means the
* cookie should be discarded immediately.
*/
strstore(&co->maxage, whatptr);
if(!co->maxage) {
badcookie = TRUE;
break;
}
}
else if(strcasecompare("expires", name)) {
strstore(&co->expirestr, whatptr);
if(!co->expirestr) {
badcookie = TRUE;
break;
}
}
/*
* Else, this is the second (or more) name we don't know about!
*/
}
else {
/* this is an "illegal" <what>=<this> pair */
}
if(!semiptr || !*semiptr) {
/* we already know there are no more cookies */
semiptr = NULL;
continue;
}
ptr = semiptr + 1;
while(*ptr && ISBLANK(*ptr))
ptr++;
semiptr = strchr(ptr, ';'); /* now, find the next semicolon */
if(!semiptr && *ptr)
/*
* There are no more semicolons, but there's a final name=value pair
* coming up
*/
semiptr = strchr(ptr, '\0');
} while(semiptr);
if(co->maxage) {
CURLofft offt;
offt = curlx_strtoofft((*co->maxage == '\"')?
&co->maxage[1]:&co->maxage[0], NULL, 10,
&co->expires);
if(offt == CURL_OFFT_FLOW)
/* overflow, used max value */
co->expires = CURL_OFF_T_MAX;
else if(!offt) {
if(!co->expires)
/* already expired */
co->expires = 1;
else if(CURL_OFF_T_MAX - now < co->expires)
/* would overflow */
co->expires = CURL_OFF_T_MAX;
else
co->expires += now;
}
}
else if(co->expirestr) {
/*
* Note that if the date couldn't get parsed for whatever reason, the
* cookie will be treated as a session cookie
*/
co->expires = Curl_getdate_capped(co->expirestr);
/*
* Session cookies have expires set to 0 so if we get that back from the
* date parser let's add a second to make it a non-session cookie
*/
if(co->expires == 0)
co->expires = 1;
else if(co->expires < 0)
co->expires = 0;
}
if(!badcookie && !co->domain) {
if(domain) {
/* no domain was given in the header line, set the default */
co->domain = strdup(domain);
if(!co->domain)
badcookie = TRUE;
}
}
if(!badcookie && !co->path && path) {
/*
* No path was given in the header line, set the default. Note that the
* passed-in path to this function MAY have a '?' and following part that
* MUST NOT be stored as part of the path.
*/
char *queryp = strchr(path, '?');
/*
* queryp is where the interesting part of the path ends, so now we
* want to the find the last
*/
char *endslash;
if(!queryp)
endslash = strrchr(path, '/');
else
endslash = memrchr(path, '/', (queryp - path));
if(endslash) {
size_t pathlen = (endslash-path + 1); /* include end slash */
co->path = malloc(pathlen + 1); /* one extra for the zero byte */
if(co->path) {
memcpy(co->path, path, pathlen);
co->path[pathlen] = 0; /* null-terminate */
co->spath = sanitize_cookie_path(co->path);
if(!co->spath)
badcookie = TRUE; /* out of memory bad */
}
else
badcookie = TRUE;
}
}
/*
* If we didn't get a cookie name, or a bad one, the this is an illegal
* line so bail out.
*/
if(badcookie || !co->name) {
freecookie(co);
return NULL;
}
}
else {
/*
* This line is NOT a HTTP header style line, we do offer support for
* reading the odd netscape cookies-file format here
*/
char *ptr;
char *firstptr;
char *tok_buf = NULL;
int fields;
/*
* IE introduced HTTP-only cookies to prevent XSS attacks. Cookies marked
* with httpOnly after the domain name are not accessible from javascripts,
* but since curl does not operate at javascript level, we include them
* anyway. In Firefox's cookie files, these lines are preceded with
* #HttpOnly_ and then everything is as usual, so we skip 10 characters of
* the line..
*/
if(strncmp(lineptr, "#HttpOnly_", 10) == 0) {
lineptr += 10;
co->httponly = TRUE;
}
if(lineptr[0]=='#') {
/* don't even try the comments */
free(co);
return NULL;
}
/* strip off the possible end-of-line characters */
ptr = strchr(lineptr, '\r');
if(ptr)
*ptr = 0; /* clear it */
ptr = strchr(lineptr, '\n');
if(ptr)
*ptr = 0; /* clear it */
firstptr = strtok_r(lineptr, "\t", &tok_buf); /* tokenize it on the TAB */
/*
* Now loop through the fields and init the struct we already have
* allocated
*/
for(ptr = firstptr, fields = 0; ptr && !badcookie;
ptr = strtok_r(NULL, "\t", &tok_buf), fields++) {
switch(fields) {
case 0:
if(ptr[0]=='.') /* skip preceding dots */
ptr++;
co->domain = strdup(ptr);
if(!co->domain)
badcookie = TRUE;
break;
case 1:
/*
* flag: A TRUE/FALSE value indicating if all machines within a given
* domain can access the variable. Set TRUE when the cookie says
* .domain.com and to false when the domain is complete www.domain.com
*/
co->tailmatch = strcasecompare(ptr, "TRUE")?TRUE:FALSE;
break;
case 2:
/* The file format allows the path field to remain not filled in */
if(strcmp("TRUE", ptr) && strcmp("FALSE", ptr)) {
/* only if the path doesn't look like a boolean option! */
co->path = strdup(ptr);
if(!co->path)
badcookie = TRUE;
else {
co->spath = sanitize_cookie_path(co->path);
if(!co->spath) {
badcookie = TRUE; /* out of memory bad */
}
}
break;
}
/* this doesn't look like a path, make one up! */
co->path = strdup("/");
if(!co->path)
badcookie = TRUE;
co->spath = strdup("/");
if(!co->spath)
badcookie = TRUE;
fields++; /* add a field and fall down to secure */
/* FALLTHROUGH */
case 3:
co->secure = FALSE;
if(strcasecompare(ptr, "TRUE")) {
if(secure || c->running)
co->secure = TRUE;
else
badcookie = TRUE;
}
break;
case 4:
if(curlx_strtoofft(ptr, NULL, 10, &co->expires))
badcookie = TRUE;
break;
case 5:
co->name = strdup(ptr);
if(!co->name)
badcookie = TRUE;
else {
/* For Netscape file format cookies we check prefix on the name */
if(strncasecompare("__Secure-", co->name, 9))
co->prefix |= COOKIE_PREFIX__SECURE;
else if(strncasecompare("__Host-", co->name, 7))
co->prefix |= COOKIE_PREFIX__HOST;
}
break;
case 6:
co->value = strdup(ptr);
if(!co->value)
badcookie = TRUE;
break;
}
}
if(6 == fields) {
/* we got a cookie with blank contents, fix it */
co->value = strdup("");
if(!co->value)
badcookie = TRUE;
else
fields++;
}
if(!badcookie && (7 != fields))
/* we did not find the sufficient number of fields */
badcookie = TRUE;
if(badcookie) {
freecookie(co);
return NULL;
}
}
if(co->prefix & COOKIE_PREFIX__SECURE) {
/* The __Secure- prefix only requires that the cookie be set secure */
if(!co->secure) {
freecookie(co);
return NULL;
}
}
if(co->prefix & COOKIE_PREFIX__HOST) {
/*
* The __Host- prefix requires the cookie to be secure, have a "/" path
* and not have a domain set.
*/
if(co->secure && co->path && strcmp(co->path, "/") == 0 && !co->tailmatch)
;
else {
freecookie(co);
return NULL;
}
}
if(!c->running && /* read from a file */
c->newsession && /* clean session cookies */
!co->expires) { /* this is a session cookie since it doesn't expire! */
freecookie(co);
return NULL;
}
co->livecookie = c->running;
co->creationtime = ++c->lastct;
/*
* Now we have parsed the incoming line, we must now check if this supersedes
* an already existing cookie, which it may if the previous have the same
* domain and path as this.
*/
/* at first, remove expired cookies */
if(!noexpire)
remove_expired(c);
#ifdef USE_LIBPSL
/*
* Check if the domain is a Public Suffix and if yes, ignore the cookie. We
* must also check that the data handle isn't NULL since the psl code will
* dereference it.
*/
if(data && (domain && co->domain && !Curl_host_is_ipnum(co->domain))) {
const psl_ctx_t *psl = Curl_psl_use(data);
int acceptable;
if(psl) {
acceptable = psl_is_cookie_domain_acceptable(psl, domain, co->domain);
Curl_psl_release(data);
}
else
acceptable = !bad_domain(domain);
if(!acceptable) {
infof(data, "cookie '%s' dropped, domain '%s' must not "
"set cookies for '%s'\n", co->name, domain, co->domain);
freecookie(co);
return NULL;
}
}
#endif
myhash = cookiehash(co->domain);
clist = c->cookies[myhash];
replace_old = FALSE;
while(clist) {
if(strcasecompare(clist->name, co->name)) {
/* the names are identical */
if(clist->domain && co->domain) {
if(strcasecompare(clist->domain, co->domain) &&
(clist->tailmatch == co->tailmatch))
/* The domains are identical */
replace_old = TRUE;
}
else if(!clist->domain && !co->domain)
replace_old = TRUE;
if(replace_old) {
/* the domains were identical */
if(clist->spath && co->spath) {
if(clist->secure && !co->secure && !secure) {
size_t cllen;
const char *sep;
/*
* A non-secure cookie may not overlay an existing secure cookie.
* For an existing cookie "a" with path "/login", refuse a new
* cookie "a" with for example path "/login/en", while the path
* "/loginhelper" is ok.
*/
sep = strchr(clist->spath + 1, '/');
if(sep)
cllen = sep - clist->spath;
else
cllen = strlen(clist->spath);
if(strncasecompare(clist->spath, co->spath, cllen)) {
freecookie(co);
return NULL;
}
}
else if(strcasecompare(clist->spath, co->spath))
replace_old = TRUE;
else
replace_old = FALSE;
}
else if(!clist->spath && !co->spath)
replace_old = TRUE;
else
replace_old = FALSE;
}
if(replace_old && !co->livecookie && clist->livecookie) {
/*
* Both cookies matched fine, except that the already present cookie is
* "live", which means it was set from a header, while the new one was
* read from a file and thus isn't "live". "live" cookies are preferred
* so the new cookie is freed.
*/
freecookie(co);
return NULL;
}
if(replace_old) {
co->next = clist->next; /* get the next-pointer first */
/* when replacing, creationtime is kept from old */
co->creationtime = clist->creationtime;
/* then free all the old pointers */
free(clist->name);
free(clist->value);
free(clist->domain);
free(clist->path);
free(clist->spath);
free(clist->expirestr);
free(clist->version);
free(clist->maxage);
*clist = *co; /* then store all the new data */
free(co); /* free the newly allocated memory */
co = clist; /* point to the previous struct instead */
/*
* We have replaced a cookie, now skip the rest of the list but make
* sure the 'lastc' pointer is properly set
*/
do {
lastc = clist;
clist = clist->next;
} while(clist);
break;
}
}
lastc = clist;
clist = clist->next;
}
if(c->running)
/* Only show this when NOT reading the cookies from a file */
infof(data, "%s cookie %s=\"%s\" for domain %s, path %s, "
"expire %" CURL_FORMAT_CURL_OFF_T "\n",
replace_old?"Replaced":"Added", co->name, co->value,
co->domain, co->path, co->expires);
if(!replace_old) {
/* then make the last item point on this new one */
if(lastc)
lastc->next = co;
else
c->cookies[myhash] = co;
c->numcookies++; /* one more cookie in the jar */
}
return co;
}
/*
* Curl_cookie_init()
*
* Inits a cookie struct to read data from a local file. This is always
* called before any cookies are set. File may be NULL in which case only the
* struct is initialized. Is file is "-" then STDIN is read.
*
* If 'newsession' is TRUE, discard all "session cookies" on read from file.
*
* Note that 'data' might be called as NULL pointer.
*
* Returns NULL on out of memory. Invalid cookies are ignored.
*/
struct CookieInfo *Curl_cookie_init(struct Curl_easy *data,
const char *file,
struct CookieInfo *inc,
bool newsession)
{
struct CookieInfo *c;
FILE *fp = NULL;
bool fromfile = TRUE;
char *line = NULL;
if(NULL == inc) {
/* we didn't get a struct, create one */
c = calloc(1, sizeof(struct CookieInfo));
if(!c)
return NULL; /* failed to get memory */
c->filename = strdup(file?file:"none"); /* copy the name just in case */
if(!c->filename)
goto fail; /* failed to get memory */
}
else {
/* we got an already existing one, use that */
c = inc;
}
c->running = FALSE; /* this is not running, this is init */
if(file && !strcmp(file, "-")) {
fp = stdin;
fromfile = FALSE;
}
else if(file && !*file) {
/* points to a "" string */
fp = NULL;
}
else
fp = file?fopen(file, FOPEN_READTEXT):NULL;
c->newsession = newsession; /* new session? */
if(fp) {
char *lineptr;
bool headerline;
line = malloc(MAX_COOKIE_LINE);
if(!line)
goto fail;
while(Curl_get_line(line, MAX_COOKIE_LINE, fp)) {
if(checkprefix("Set-Cookie:", line)) {
/* This is a cookie line, get it! */
lineptr = &line[11];
headerline = TRUE;
}
else {
lineptr = line;
headerline = FALSE;
}
while(*lineptr && ISBLANK(*lineptr))
lineptr++;
Curl_cookie_add(data, c, headerline, TRUE, lineptr, NULL, NULL, TRUE);
}
free(line); /* free the line buffer */
/*
* Remove expired cookies from the hash. We must make sure to run this
* after reading the file, and not not on every cookie.
*/
remove_expired(c);
if(fromfile)
fclose(fp);
}
c->running = TRUE; /* now, we're running */
if(data)
data->state.cookie_engine = TRUE;
return c;
fail:
free(line);
/*
* Only clean up if we allocated it here, as the original could still be in
* use by a share handle.
*/
if(!inc)
Curl_cookie_cleanup(c);
if(fromfile && fp)
fclose(fp);
return NULL; /* out of memory */
}
/*
* cookie_sort
*
* Helper function to sort cookies such that the longest path gets before the
* shorter path. Path, domain and name lengths are considered in that order,
* with the creationtime as the tiebreaker. The creationtime is guaranteed to
* be unique per cookie, so we know we will get an ordering at that point.
*/
static int cookie_sort(const void *p1, const void *p2)
{
struct Cookie *c1 = *(struct Cookie **)p1;
struct Cookie *c2 = *(struct Cookie **)p2;
size_t l1, l2;
/* 1 - compare cookie path lengths */
l1 = c1->path ? strlen(c1->path) : 0;
l2 = c2->path ? strlen(c2->path) : 0;
if(l1 != l2)
return (l2 > l1) ? 1 : -1 ; /* avoid size_t <=> int conversions */
/* 2 - compare cookie domain lengths */
l1 = c1->domain ? strlen(c1->domain) : 0;
l2 = c2->domain ? strlen(c2->domain) : 0;
if(l1 != l2)
return (l2 > l1) ? 1 : -1 ; /* avoid size_t <=> int conversions */
/* 3 - compare cookie name lengths */
l1 = c1->name ? strlen(c1->name) : 0;
l2 = c2->name ? strlen(c2->name) : 0;
if(l1 != l2)
return (l2 > l1) ? 1 : -1;
/* 4 - compare cookie creation time */
return (c2->creationtime > c1->creationtime) ? 1 : -1;
}
/*
* cookie_sort_ct
*
* Helper function to sort cookies according to creation time.
*/
static int cookie_sort_ct(const void *p1, const void *p2)
{
struct Cookie *c1 = *(struct Cookie **)p1;
struct Cookie *c2 = *(struct Cookie **)p2;
return (c2->creationtime > c1->creationtime) ? 1 : -1;
}
#define CLONE(field) \
do { \
if(src->field) { \
d->field = strdup(src->field); \
if(!d->field) \
goto fail; \
} \
} while(0)
static struct Cookie *dup_cookie(struct Cookie *src)
{
struct Cookie *d = calloc(sizeof(struct Cookie), 1);
if(d) {
CLONE(expirestr);
CLONE(domain);
CLONE(path);
CLONE(spath);
CLONE(name);
CLONE(value);
CLONE(maxage);
CLONE(version);
d->expires = src->expires;
d->tailmatch = src->tailmatch;
d->secure = src->secure;
d->livecookie = src->livecookie;
d->httponly = src->httponly;
d->creationtime = src->creationtime;
}
return d;
fail:
freecookie(d);
return NULL;
}
/*
* Curl_cookie_getlist
*
* For a given host and path, return a linked list of cookies that the client
* should send to the server if used now. The secure boolean informs the cookie
* if a secure connection is achieved or not.
*
* It shall only return cookies that haven't expired.
*/
struct Cookie *Curl_cookie_getlist(struct CookieInfo *c,
const char *host, const char *path,
bool secure)
{
struct Cookie *newco;
struct Cookie *co;
struct Cookie *mainco = NULL;
size_t matches = 0;
bool is_ip;
const size_t myhash = cookiehash(host);
if(!c || !c->cookies[myhash])
return NULL; /* no cookie struct or no cookies in the struct */
/* at first, remove expired cookies */
remove_expired(c);
/* check if host is an IP(v4|v6) address */
is_ip = Curl_host_is_ipnum(host);
co = c->cookies[myhash];
while(co) {
/* if the cookie requires we're secure we must only continue if we are! */
if(co->secure?secure:TRUE) {
/* now check if the domain is correct */
if(!co->domain ||
(co->tailmatch && !is_ip && tailmatch(co->domain, host)) ||
((!co->tailmatch || is_ip) && strcasecompare(host, co->domain)) ) {
/*
* the right part of the host matches the domain stuff in the
* cookie data
*/
/*
* now check the left part of the path with the cookies path
* requirement
*/
if(!co->spath || pathmatch(co->spath, path) ) {
/*
* and now, we know this is a match and we should create an
* entry for the return-linked-list
*/
newco = dup_cookie(co);
if(newco) {
/* then modify our next */
newco->next = mainco;
/* point the main to us */
mainco = newco;
matches++;
}
else
goto fail;
}
}
}
co = co->next;
}
if(matches) {
/*
* Now we need to make sure that if there is a name appearing more than
* once, the longest specified path version comes first. To make this
* the swiftest way, we just sort them all based on path length.
*/
struct Cookie **array;
size_t i;
/* alloc an array and store all cookie pointers */
array = malloc(sizeof(struct Cookie *) * matches);
if(!array)
goto fail;
co = mainco;
for(i = 0; co; co = co->next)
array[i++] = co;
/* now sort the cookie pointers in path length order */
qsort(array, matches, sizeof(struct Cookie *), cookie_sort);
/* remake the linked list order according to the new order */
mainco = array[0]; /* start here */
for(i = 0; i<matches-1; i++)
array[i]->next = array[i + 1];
array[matches-1]->next = NULL; /* terminate the list */
free(array); /* remove the temporary data again */
}
return mainco; /* return the new list */
fail:
/* failure, clear up the allocated chain and return NULL */
Curl_cookie_freelist(mainco);
return NULL;
}
/*
* Curl_cookie_clearall
*
* Clear all existing cookies and reset the counter.
*/
void Curl_cookie_clearall(struct CookieInfo *cookies)
{
if(cookies) {
unsigned int i;
for(i = 0; i < COOKIE_HASH_SIZE; i++) {
Curl_cookie_freelist(cookies->cookies[i]);
cookies->cookies[i] = NULL;
}
cookies->numcookies = 0;
}
}
/*
* Curl_cookie_freelist
*
* Free a list of cookies previously returned by Curl_cookie_getlist();
*/
void Curl_cookie_freelist(struct Cookie *co)
{
struct Cookie *next;
while(co) {
next = co->next;
freecookie(co);
co = next;
}
}
/*
* Curl_cookie_clearsess
*
* Free all session cookies in the cookies list.
*/
void Curl_cookie_clearsess(struct CookieInfo *cookies)
{
struct Cookie *first, *curr, *next, *prev = NULL;
unsigned int i;
if(!cookies)
return;
for(i = 0; i < COOKIE_HASH_SIZE; i++) {
if(!cookies->cookies[i])
continue;
first = curr = prev = cookies->cookies[i];
for(; curr; curr = next) {
next = curr->next;
if(!curr->expires) {
if(first == curr)
first = next;
if(prev == curr)
prev = next;
else
prev->next = next;
freecookie(curr);
cookies->numcookies--;
}
else
prev = curr;
}
cookies->cookies[i] = first;
}
}
/*
* Curl_cookie_cleanup()
*
* Free a "cookie object" previous created with Curl_cookie_init().
*/
void Curl_cookie_cleanup(struct CookieInfo *c)
{
if(c) {
unsigned int i;
free(c->filename);
for(i = 0; i < COOKIE_HASH_SIZE; i++)
Curl_cookie_freelist(c->cookies[i]);
free(c); /* free the base struct as well */
}
}
/*
* get_netscape_format()
*
* Formats a string for Netscape output file, w/o a newline at the end.
* Function returns a char * to a formatted line. The caller is responsible
* for freeing the returned pointer.
*/
static char *get_netscape_format(const struct Cookie *co)
{
return aprintf(
"%s" /* httponly preamble */
"%s%s\t" /* domain */
"%s\t" /* tailmatch */
"%s\t" /* path */
"%s\t" /* secure */
"%" CURL_FORMAT_CURL_OFF_T "\t" /* expires */
"%s\t" /* name */
"%s", /* value */
co->httponly?"#HttpOnly_":"",
/*
* Make sure all domains are prefixed with a dot if they allow
* tailmatching. This is Mozilla-style.
*/
(co->tailmatch && co->domain && co->domain[0] != '.')? ".":"",
co->domain?co->domain:"unknown",
co->tailmatch?"TRUE":"FALSE",
co->path?co->path:"/",
co->secure?"TRUE":"FALSE",
co->expires,
co->name,
co->value?co->value:"");
}
/*
* cookie_output()
*
* Writes all internally known cookies to the specified file. Specify
* "-" as file name to write to stdout.
*
* The function returns non-zero on write failure.
*/
static CURLcode cookie_output(struct Curl_easy *data,
struct CookieInfo *c, const char *filename)
{
struct Cookie *co;
FILE *out = NULL;
bool use_stdout = FALSE;
char *tempstore = NULL;
CURLcode error = CURLE_OK;
if(!c)
/* no cookie engine alive */
return CURLE_OK;
/* at first, remove expired cookies */
remove_expired(c);
if(!strcmp("-", filename)) {
/* use stdout */
out = stdout;
use_stdout = TRUE;
}
else {
unsigned char randsuffix[9];
if(Curl_rand_hex(data, randsuffix, sizeof(randsuffix)))
return 2;
tempstore = aprintf("%s.%s.tmp", filename, randsuffix);
if(!tempstore)
return CURLE_OUT_OF_MEMORY;
out = fopen(tempstore, FOPEN_WRITETEXT);
if(!out) {
error = CURLE_WRITE_ERROR;
goto error;
}
}
fputs("# Netscape HTTP Cookie File\n"
"# https://curl.se/docs/http-cookies.html\n"
"# This file was generated by libcurl! Edit at your own risk.\n\n",
out);
if(c->numcookies) {
unsigned int i;
size_t nvalid = 0;
struct Cookie **array;
array = calloc(1, sizeof(struct Cookie *) * c->numcookies);
if(!array) {
error = CURLE_OUT_OF_MEMORY;
goto error;
}
/* only sort the cookies with a domain property */
for(i = 0; i < COOKIE_HASH_SIZE; i++) {
for(co = c->cookies[i]; co; co = co->next) {
if(!co->domain)
continue;
array[nvalid++] = co;
}
}
qsort(array, nvalid, sizeof(struct Cookie *), cookie_sort_ct);
for(i = 0; i < nvalid; i++) {
char *format_ptr = get_netscape_format(array[i]);
if(!format_ptr) {
free(array);
error = CURLE_OUT_OF_MEMORY;
goto error;
}
fprintf(out, "%s\n", format_ptr);
free(format_ptr);
}
free(array);
}
if(!use_stdout) {
fclose(out);
out = NULL;
if(Curl_rename(tempstore, filename)) {
unlink(tempstore);
error = CURLE_WRITE_ERROR;
goto error;
}
}
/*
* If we reach here we have successfully written a cookie file so theree is
* no need to inspect the error, any error case should have jumped into the
* error block below.
*/
free(tempstore);
return CURLE_OK;
error:
if(out && !use_stdout)
fclose(out);
free(tempstore);
return error;
}
static struct curl_slist *cookie_list(struct Curl_easy *data)
{
struct curl_slist *list = NULL;
struct curl_slist *beg;
struct Cookie *c;
char *line;
unsigned int i;
if(!data->cookies || (data->cookies->numcookies == 0))
return NULL;
for(i = 0; i < COOKIE_HASH_SIZE; i++) {
for(c = data->cookies->cookies[i]; c; c = c->next) {
if(!c->domain)
continue;
line = get_netscape_format(c);
if(!line) {
curl_slist_free_all(list);
return NULL;
}
beg = Curl_slist_append_nodup(list, line);
if(!beg) {
free(line);
curl_slist_free_all(list);
return NULL;
}
list = beg;
}
}
return list;
}
struct curl_slist *Curl_cookie_list(struct Curl_easy *data)
{
struct curl_slist *list;
Curl_share_lock(data, CURL_LOCK_DATA_COOKIE, CURL_LOCK_ACCESS_SINGLE);
list = cookie_list(data);
Curl_share_unlock(data, CURL_LOCK_DATA_COOKIE);
return list;
}
void Curl_flush_cookies(struct Curl_easy *data, bool cleanup)
{
CURLcode res;
if(data->set.str[STRING_COOKIEJAR]) {
if(data->state.cookielist) {
/* If there is a list of cookie files to read, do it first so that
we have all the told files read before we write the new jar.
Curl_cookie_loadfiles() LOCKS and UNLOCKS the share itself! */
Curl_cookie_loadfiles(data);
}
Curl_share_lock(data, CURL_LOCK_DATA_COOKIE, CURL_LOCK_ACCESS_SINGLE);
/* if we have a destination file for all the cookies to get dumped to */
res = cookie_output(data, data->cookies, data->set.str[STRING_COOKIEJAR]);
if(res)
infof(data, "WARNING: failed to save cookies in %s: %s\n",
data->set.str[STRING_COOKIEJAR], curl_easy_strerror(res));
}
else {
if(cleanup && data->state.cookielist) {
/* since nothing is written, we can just free the list of cookie file
names */
curl_slist_free_all(data->state.cookielist); /* clean up list */
data->state.cookielist = NULL;
}
Curl_share_lock(data, CURL_LOCK_DATA_COOKIE, CURL_LOCK_ACCESS_SINGLE);
}
if(cleanup && (!data->share || (data->cookies != data->share->cookies))) {
Curl_cookie_cleanup(data->cookies);
data->cookies = NULL;
}
Curl_share_unlock(data, CURL_LOCK_DATA_COOKIE);
}
#endif /* CURL_DISABLE_HTTP || CURL_DISABLE_COOKIES */
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