summaryrefslogtreecommitdiffstats
path: root/security/sandbox/chromium/base/unguessable_token.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
commit6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /security/sandbox/chromium/base/unguessable_token.h
parentInitial commit. (diff)
downloadthunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz
thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'security/sandbox/chromium/base/unguessable_token.h')
-rw-r--r--security/sandbox/chromium/base/unguessable_token.h120
1 files changed, 120 insertions, 0 deletions
diff --git a/security/sandbox/chromium/base/unguessable_token.h b/security/sandbox/chromium/base/unguessable_token.h
new file mode 100644
index 0000000000..895dbc46c4
--- /dev/null
+++ b/security/sandbox/chromium/base/unguessable_token.h
@@ -0,0 +1,120 @@
+// Copyright 2016 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.
+
+#ifndef BASE_UNGUESSABLE_TOKEN_H_
+#define BASE_UNGUESSABLE_TOKEN_H_
+
+#include <stdint.h>
+#include <string.h>
+#include <iosfwd>
+#include <tuple>
+
+#include "base/base_export.h"
+#include "base/hash/hash.h"
+#include "base/logging.h"
+#include "base/token.h"
+
+namespace base {
+
+struct UnguessableTokenHash;
+
+// UnguessableToken is, like Token, a randomly chosen 128-bit value. Unlike
+// Token, a new UnguessableToken is always generated at runtime from a
+// cryptographically strong random source (or copied or serialized and
+// deserialized from another such UnguessableToken). It can be used as part of a
+// larger aggregate type, or as an ID in and of itself.
+//
+// An UnguessableToken is a strong *bearer token*. Bearer tokens are like HTTP
+// cookies: if a caller has the token, the callee thereby considers the caller
+// authorized to request the operation the callee performs.
+//
+// UnguessableToken can be used when the resource associated with the ID needs
+// to be protected against manipulation by other untrusted agents in the system,
+// and there is no other convenient way to verify the authority of the agent to
+// do so (because the resource is part of a table shared across processes, for
+// instance). In such a scheme, knowledge of the token value in and of itself is
+// sufficient proof of authority to carry out an operation on the associated
+// resource.
+//
+// Use Create() for creating new UnguessableTokens.
+//
+// NOTE: It is illegal to send empty UnguessableTokens across processes, and
+// sending/receiving empty tokens should be treated as a security issue. If
+// there is a valid scenario for sending "no token" across processes, use
+// base::Optional instead of an empty token.
+
+class BASE_EXPORT UnguessableToken {
+ public:
+ // Create a unique UnguessableToken.
+ static UnguessableToken Create();
+
+ // Returns a reference to a global null UnguessableToken. This should only be
+ // used for functions that need to return a reference to an UnguessableToken,
+ // and should not be used as a general-purpose substitute for invoking the
+ // default constructor.
+ static const UnguessableToken& Null();
+
+ // Return a UnguessableToken built from the high/low bytes provided.
+ // It should only be used in deserialization scenarios.
+ //
+ // NOTE: If the deserialized token is empty, it means that it was never
+ // initialized via Create(). This is a security issue, and should be handled.
+ static UnguessableToken Deserialize(uint64_t high, uint64_t low);
+
+ // Creates an empty UnguessableToken.
+ // Assign to it with Create() before using it.
+ constexpr UnguessableToken() = default;
+
+ // NOTE: Serializing an empty UnguessableToken is an illegal operation.
+ uint64_t GetHighForSerialization() const {
+ DCHECK(!is_empty());
+ return token_.high();
+ }
+
+ // NOTE: Serializing an empty UnguessableToken is an illegal operation.
+ uint64_t GetLowForSerialization() const {
+ DCHECK(!is_empty());
+ return token_.low();
+ }
+
+ bool is_empty() const { return token_.is_zero(); }
+
+ // Hex representation of the unguessable token.
+ std::string ToString() const { return token_.ToString(); }
+
+ explicit operator bool() const { return !is_empty(); }
+
+ bool operator<(const UnguessableToken& other) const {
+ return token_ < other.token_;
+ }
+
+ bool operator==(const UnguessableToken& other) const {
+ return token_ == other.token_;
+ }
+
+ bool operator!=(const UnguessableToken& other) const {
+ return !(*this == other);
+ }
+
+ private:
+ friend struct UnguessableTokenHash;
+ explicit UnguessableToken(const Token& token);
+
+ base::Token token_;
+};
+
+BASE_EXPORT std::ostream& operator<<(std::ostream& out,
+ const UnguessableToken& token);
+
+// For use in std::unordered_map.
+struct UnguessableTokenHash {
+ size_t operator()(const base::UnguessableToken& token) const {
+ DCHECK(token);
+ return TokenHash()(token.token_);
+ }
+};
+
+} // namespace base
+
+#endif // BASE_UNGUESSABLE_TOKEN_H_