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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/cookies/cookie_util.h"
#include <cstdio>
#include <cstdlib>
#include "base/logging.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#include "net/base/net_util.h"
#include "net/base/registry_controlled_domains/registry_controlled_domain.h"
#include "url/gurl.h"
namespace net {
namespace cookie_util {
bool DomainIsHostOnly(const std::string& domain_string) {
return (domain_string.empty() || domain_string[0] != '.');
}
std::string GetEffectiveDomain(const std::string& scheme,
const std::string& host) {
if (scheme == "http" || scheme == "https") {
return registry_controlled_domains::GetDomainAndRegistry(
host, net::registry_controlled_domains::EXCLUDE_PRIVATE_REGISTRIES);
}
if (!DomainIsHostOnly(host))
return host.substr(1);
return host;
}
bool GetCookieDomainWithString(const GURL& url,
const std::string& domain_string,
std::string* result) {
const std::string url_host(url.host());
// If no domain was specified in the domain string, default to a host cookie.
// We match IE/Firefox in allowing a domain=IPADDR if it matches the url
// ip address hostname exactly. It should be treated as a host cookie.
if (domain_string.empty() ||
(url.HostIsIPAddress() && url_host == domain_string)) {
*result = url_host;
DCHECK(DomainIsHostOnly(*result));
return true;
}
// Get the normalized domain specified in cookie line.
url_canon::CanonHostInfo ignored;
std::string cookie_domain(CanonicalizeHost(domain_string, &ignored));
if (cookie_domain.empty())
return false;
if (cookie_domain[0] != '.')
cookie_domain = "." + cookie_domain;
// Ensure |url| and |cookie_domain| have the same domain+registry.
const std::string url_scheme(url.scheme());
const std::string url_domain_and_registry(
GetEffectiveDomain(url_scheme, url_host));
if (url_domain_and_registry.empty())
return false; // IP addresses/intranet hosts can't set domain cookies.
const std::string cookie_domain_and_registry(
GetEffectiveDomain(url_scheme, cookie_domain));
if (url_domain_and_registry != cookie_domain_and_registry)
return false; // Can't set a cookie on a different domain + registry.
// Ensure |url_host| is |cookie_domain| or one of its subdomains. Given that
// we know the domain+registry are the same from the above checks, this is
// basically a simple string suffix check.
const bool is_suffix = (url_host.length() < cookie_domain.length()) ?
(cookie_domain != ("." + url_host)) :
(url_host.compare(url_host.length() - cookie_domain.length(),
cookie_domain.length(), cookie_domain) != 0);
if (is_suffix)
return false;
*result = cookie_domain;
return true;
}
// Parse a cookie expiration time. We try to be lenient, but we need to
// assume some order to distinguish the fields. The basic rules:
// - The month name must be present and prefix the first 3 letters of the
// full month name (jan for January, jun for June).
// - If the year is <= 2 digits, it must occur after the day of month.
// - The time must be of the format hh:mm:ss.
// An average cookie expiration will look something like this:
// Sat, 15-Apr-17 21:01:22 GMT
base::Time ParseCookieTime(const std::string& time_string) {
static const char* kMonths[] = { "jan", "feb", "mar", "apr", "may", "jun",
"jul", "aug", "sep", "oct", "nov", "dec" };
static const int kMonthsLen = arraysize(kMonths);
// We want to be pretty liberal, and support most non-ascii and non-digit
// characters as a delimiter. We can't treat : as a delimiter, because it
// is the delimiter for hh:mm:ss, and we want to keep this field together.
// We make sure to include - and +, since they could prefix numbers.
// If the cookie attribute came in in quotes (ex expires="XXX"), the quotes
// will be preserved, and we will get them here. So we make sure to include
// quote characters, and also \ for anything that was internally escaped.
static const char* kDelimiters = "\t !\"#$%&'()*+,-./;<=>?@[\\]^_`{|}~";
base::Time::Exploded exploded = {0};
base::StringTokenizer tokenizer(time_string, kDelimiters);
bool found_day_of_month = false;
bool found_month = false;
bool found_time = false;
bool found_year = false;
while (tokenizer.GetNext()) {
const std::string token = tokenizer.token();
DCHECK(!token.empty());
bool numerical = IsAsciiDigit(token[0]);
// String field
if (!numerical) {
if (!found_month) {
for (int i = 0; i < kMonthsLen; ++i) {
// Match prefix, so we could match January, etc
if (base::strncasecmp(token.c_str(), kMonths[i], 3) == 0) {
exploded.month = i + 1;
found_month = true;
break;
}
}
} else {
// If we've gotten here, it means we've already found and parsed our
// month, and we have another string, which we would expect to be the
// the time zone name. According to the RFC and my experiments with
// how sites format their expirations, we don't have much of a reason
// to support timezones. We don't want to ever barf on user input,
// but this DCHECK should pass for well-formed data.
// DCHECK(token == "GMT");
}
// Numeric field w/ a colon
} else if (token.find(':') != std::string::npos) {
if (!found_time &&
#ifdef COMPILER_MSVC
sscanf_s(
#else
sscanf(
#endif
token.c_str(), "%2u:%2u:%2u", &exploded.hour,
&exploded.minute, &exploded.second) == 3) {
found_time = true;
} else {
// We should only ever encounter one time-like thing. If we're here,
// it means we've found a second, which shouldn't happen. We keep
// the first. This check should be ok for well-formed input:
// NOTREACHED();
}
// Numeric field
} else {
// Overflow with atoi() is unspecified, so we enforce a max length.
if (!found_day_of_month && token.length() <= 2) {
exploded.day_of_month = atoi(token.c_str());
found_day_of_month = true;
} else if (!found_year && token.length() <= 5) {
exploded.year = atoi(token.c_str());
found_year = true;
} else {
// If we're here, it means we've either found an extra numeric field,
// or a numeric field which was too long. For well-formed input, the
// following check would be reasonable:
// NOTREACHED();
}
}
}
if (!found_day_of_month || !found_month || !found_time || !found_year) {
// We didn't find all of the fields we need. For well-formed input, the
// following check would be reasonable:
// NOTREACHED() << "Cookie parse expiration failed: " << time_string;
return base::Time();
}
// Normalize the year to expand abbreviated years to the full year.
if (exploded.year >= 69 && exploded.year <= 99)
exploded.year += 1900;
if (exploded.year >= 0 && exploded.year <= 68)
exploded.year += 2000;
// If our values are within their correct ranges, we got our time.
if (exploded.day_of_month >= 1 && exploded.day_of_month <= 31 &&
exploded.month >= 1 && exploded.month <= 12 &&
exploded.year >= 1601 && exploded.year <= 30827 &&
exploded.hour <= 23 && exploded.minute <= 59 && exploded.second <= 59) {
return base::Time::FromUTCExploded(exploded);
}
// One of our values was out of expected range. For well-formed input,
// the following check would be reasonable:
// NOTREACHED() << "Cookie exploded expiration failed: " << time_string;
return base::Time();
}
GURL CookieOriginToURL(const std::string& domain, bool is_https) {
if (domain.empty())
return GURL();
const std::string scheme = is_https ? "https" : "http";
const std::string host = domain[0] == '.' ? domain.substr(1) : domain;
return GURL(scheme + "://" + host);
}
} // namespace cookie_utils
} // namespace net
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