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372361f6ca
curl/lib/cookie.c
Daniel Gustafsson 1bd4b3f4e2 cookies: track expiration in jar to optimize removals 
Removing expired cookies needs to be a fast operation since we want to
be able to perform it often and speculatively. By tracking the timestamp
of the next known expiration we can exit early in case the timestamp is
in the future.

Closes: #7172
Reviewed-by: Daniel Stenberg <daniel@haxx.se>
2021-06-08 09:31:19 +02:00

1767 lines
48 KiB
C
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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. If the cookiejar has recorded the next timestamp at which one or
* more cookies expire, then processing will exit early in case this timestamp
* is in the future.
*/
static void remove_expired(struct CookieInfo *cookies)
{
struct Cookie *co, *nx;
curl_off_t now = (curl_off_t)time(NULL);
unsigned int i;
/*
* If the earliest expiration timestamp in the jar is in the future we can
* skip scanning the whole jar and instead exit early as there won't be any
* cookies to evict. If we need to evict however, reset the next_expiration
* counter in order to track the next one. In case the recorded first
* expiration is the max offset, then perform the safe fallback of checking
* all cookies.
*/
if(now < cookies->next_expiration &&
cookies->next_expiration != CURL_OFF_T_MAX)
return;
else
cookies->next_expiration = CURL_OFF_T_MAX;
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 {
/*
* If this cookie has an expiration timestamp earlier than what we've
* seen so far then record it for the next round of expirations.
*/
if(co->expires && co->expires < cookies->next_expiration)
cookies->next_expiration = co->expires;
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 */
}
/*
* Now that we've added a new cookie to the jar, update the expiration
* tracker in case it is the next one to expire.
*/
if(co->expires && (co->expires < c->next_expiration))
c->next_expiration = co->expires;
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 */
/*
* Initialize the next_expiration time to signal that we don't have enough
* information yet.
*/
c->next_expiration = CURL_OFF_T_MAX;
}
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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