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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /xpcom/base/nsID.cpp | |
parent | Initial commit. (diff) | |
download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | xpcom/base/nsID.cpp | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/xpcom/base/nsID.cpp b/xpcom/base/nsID.cpp new file mode 100644 index 0000000000..701bf647d1 --- /dev/null +++ b/xpcom/base/nsID.cpp @@ -0,0 +1,239 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "nsID.h" + +#include <limits.h> + +#include "MainThreadUtils.h" +#include "mozilla/Assertions.h" +#include "mozilla/RandomNum.h" +#include "mozilla/Sprintf.h" +#include "nss.h" +#include "ScopedNSSTypes.h" + +[[nodiscard]] static bool GenerateRandomBytesFromNSS(void* aBuffer, + size_t aLength) { + MOZ_ASSERT(aBuffer); + + // Bounds check that we can safely truncate size_t `aLength` to an int. + if (aLength == 0 || aLength > INT_MAX) { + MOZ_ASSERT_UNREACHABLE("Bad aLength"); + return false; + } + int len = static_cast<int>(aLength); + + // Only try to use NSS on the main thread. + if (!NS_IsMainThread() || !NSS_IsInitialized()) { + return false; + } + + mozilla::UniquePK11SlotInfo slot(PK11_GetInternalSlot()); + if (!slot) { + MOZ_ASSERT_UNREACHABLE("Null slot"); + return false; + } + + SECStatus srv = PK11_GenerateRandomOnSlot( + slot.get(), static_cast<unsigned char*>(aBuffer), len); + MOZ_ASSERT(srv == SECSuccess); + return (srv == SECSuccess); +} + +nsresult nsID::GenerateUUIDInPlace(nsID& aId) { + // Firefox needs to generate some UUIDs before NSS has been initialized. We + // prefer NSS's RNG, but if NSS is not available yet or returns an error, fall + // back to MFBT's GenerateRandomBytes(). + if (!GenerateRandomBytesFromNSS(&aId, sizeof(nsID)) && + !mozilla::GenerateRandomBytesFromOS(&aId, sizeof(nsID))) { + MOZ_ASSERT_UNREACHABLE("GenerateRandomBytesFromOS() failed"); + return NS_ERROR_NOT_AVAILABLE; + } + + // Put in the version + aId.m2 &= 0x0fff; + aId.m2 |= 0x4000; + + // Put in the variant + aId.m3[0] &= 0x3f; + aId.m3[0] |= 0x80; + + return NS_OK; +} + +nsID nsID::GenerateUUID() { + nsID uuid; + nsresult rv = GenerateUUIDInPlace(uuid); + MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv)); + return uuid; +} + +void nsID::Clear() { + m0 = 0; + m1 = 0; + m2 = 0; + memset(m3, 0, sizeof(m3)); +} + +/** + * Multiplies the_int_var with 16 (0x10) and adds the value of the + * hexadecimal digit the_char. If it fails it returns false from + * the function it's used in. + */ + +#define ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(the_char, the_int_var) \ + the_int_var = (the_int_var << 4) + the_char; \ + if (the_char >= '0' && the_char <= '9') \ + the_int_var -= '0'; \ + else if (the_char >= 'a' && the_char <= 'f') \ + the_int_var -= 'a' - 10; \ + else if (the_char >= 'A' && the_char <= 'F') \ + the_int_var -= 'A' - 10; \ + else \ + return false + +/** + * Parses number_of_chars characters from the char_pointer pointer and + * puts the number in the dest_variable. The pointer is moved to point + * at the first character after the parsed ones. If it fails it returns + * false from the function the macro is used in. + */ + +#define PARSE_CHARS_TO_NUM(char_pointer, dest_variable, number_of_chars) \ + do { \ + int32_t _i = number_of_chars; \ + dest_variable = 0; \ + while (_i) { \ + ADD_HEX_CHAR_TO_INT_OR_RETURN_FALSE(*char_pointer, dest_variable); \ + char_pointer++; \ + _i--; \ + } \ + } while (0) + +/** + * Parses a hyphen from the char_pointer string. If there is no hyphen there + * the function returns false from the function it's used in. The + * char_pointer is advanced one step. + */ + +#define PARSE_HYPHEN(char_pointer) \ + if (*(char_pointer++) != '-') return false + +/* + * Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} string into + * an nsID. It can also handle the old format without the { and }. + */ + +bool nsID::Parse(const char* aIDStr) { + /* Optimized for speed */ + if (!aIDStr) { + return false; + } + + bool expectFormat1 = (aIDStr[0] == '{'); + if (expectFormat1) { + ++aIDStr; + } + + PARSE_CHARS_TO_NUM(aIDStr, m0, 8); + PARSE_HYPHEN(aIDStr); + PARSE_CHARS_TO_NUM(aIDStr, m1, 4); + PARSE_HYPHEN(aIDStr); + PARSE_CHARS_TO_NUM(aIDStr, m2, 4); + PARSE_HYPHEN(aIDStr); + int i; + for (i = 0; i < 2; ++i) { + PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2); + } + PARSE_HYPHEN(aIDStr); + while (i < 8) { + PARSE_CHARS_TO_NUM(aIDStr, m3[i], 2); + i++; + } + + return expectFormat1 ? *aIDStr == '}' : true; +} + +#ifndef XPCOM_GLUE_AVOID_NSPR + +/* + * Returns a managed string in {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} + * format. + */ +nsIDToCString nsID::ToString() const { return nsIDToCString(*this); } + +static const char sHexChars[256 * 2 + 1] = + "000102030405060708090a0b0c0d0e0f" + "101112131415161718191a1b1c1d1e1f" + "202122232425262728292a2b2c2d2e2f" + "303132333435363738393a3b3c3d3e3f" + "404142434445464748494a4b4c4d4e4f" + "505152535455565758595a5b5c5d5e5f" + "606162636465666768696a6b6c6d6e6f" + "707172737475767778797a7b7c7d7e7f" + "808182838485868788898a8b8c8d8e8f" + "909192939495969798999a9b9c9d9e9f" + "a0a1a2a3a4a5a6a7a8a9aaabacadaeaf" + "b0b1b2b3b4b5b6b7b8b9babbbcbdbebf" + "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf" + "d0d1d2d3d4d5d6d7d8d9dadbdcdddedf" + "e0e1e2e3e4e5e6e7e8e9eaebecedeeef" + "f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff"; + +// Writes a zero-padded 8-bit integer as lowercase hex into aDest[0..2] +static void ToHex8Bit(uint8_t aValue, char* aDest) { + aDest[0] = sHexChars[2 * aValue]; + aDest[1] = sHexChars[2 * aValue + 1]; +} + +// Writes a zero-padded 16-bit integer as lowercase hex into aDest[0..4] +static void ToHex16Bit(uint16_t aValue, char* aDest) { + const uint8_t hi = (aValue >> 8); + const uint8_t lo = aValue; + ToHex8Bit(hi, &aDest[0]); + ToHex8Bit(lo, &aDest[2]); +} + +// Writes a zero-padded 32-bit integer as lowercase hex into aDest[0..8] +static void ToHex32Bit(uint32_t aValue, char* aDest) { + const uint16_t hi = (aValue >> 16); + const uint16_t lo = aValue; + ToHex16Bit(hi, &aDest[0]); + ToHex16Bit(lo, &aDest[4]); +} + +void nsID::ToProvidedString(char (&aDest)[NSID_LENGTH]) const { + // Stringify manually, for best performance. + // + // "{%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}" + // "{ecc35fd2-9029-4287-a826-b0a241d48d31}" + aDest[0] = '{'; + ToHex32Bit(m0, &aDest[1]); + aDest[9] = '-'; + ToHex16Bit(m1, &aDest[10]); + aDest[14] = '-'; + ToHex16Bit(m2, &aDest[15]); + aDest[19] = '-'; + ToHex8Bit(m3[0], &aDest[20]); + ToHex8Bit(m3[1], &aDest[22]); + aDest[24] = '-'; + ToHex8Bit(m3[2], &aDest[25]); + ToHex8Bit(m3[3], &aDest[27]); + ToHex8Bit(m3[4], &aDest[29]); + ToHex8Bit(m3[5], &aDest[31]); + ToHex8Bit(m3[6], &aDest[33]); + ToHex8Bit(m3[7], &aDest[35]); + aDest[37] = '}'; + aDest[38] = '\0'; +} + +#endif // XPCOM_GLUE_AVOID_NSPR + +nsID* nsID::Clone() const { + auto id = static_cast<nsID*>(moz_xmalloc(sizeof(nsID))); + *id = *this; + return id; +} |