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Fix corner cases of handling of Common Name fallback encoding #28911

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merged 10 commits into from
Aug 29, 2023
Merged

Fix corner cases of handling of Common Name fallback encoding #28911

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0fab560
Fix corner cases of handling of Common Name fallback encoding
tennessee-google Aug 25, 2023
2781b53
Merge branch 'master' into fix-two-dac-issues
tcarmelveilleux Aug 26, 2023
af9e2ce
Restyled by clang-format
restyled-commits Aug 26, 2023
a6d0f0d
Restyled by prettier-json
restyled-commits Aug 26, 2023
fe64fc4
Merge remote-tracking branch 'upstream/master' into fix-two-dac-issues
tcarmelveilleux Aug 29, 2023
754918a
Address review comments by revamping algorithm
tcarmelveilleux Aug 29, 2023
5335092
Fix leftover comment follow-ups from @bzbarsky-apple from #28899
tcarmelveilleux Aug 29, 2023
27fe59f
Restyled by clang-format
restyled-commits Aug 29, 2023
52ba070
Add more comments and fix clang-tidy
tennessee-google Aug 29, 2023
515a9d0
Address more review comments
tennessee-google Aug 29, 2023
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2 changes: 1 addition & 1 deletion ...development/commissioner_dut/struct_pai_vidpid_fallback_encoding_08/test_case_vector.json
View file
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
{
"description": "PAI Test Vector: Fallback VID and PID encoding example from spec: invalid, since substring following Mpid: is not exactly 4 uppercase hexadecimal digits",
"is_success_case": "true",
"is_success_case": "false",
"dac_cert": "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",
"pai_cert": "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",
"certification_declaration": "3081e906092a864886f70d010702a081db3081d8020103310d300b0609608648016503040201304406092a864886f70d010701a0370435152400012501f1ff360204b118250334122c04135a494732303134315a423333303030312d32342405002406002507769824080018317e307c020103801462fa823359acfaa9963e1cfa140addf504f37160300b0609608648016503040201300a06082a8648ce3d04030204483046022100e1d4967878513c474101db44c68061689be47443e21f6675c34b872edc5a319c022100a963e07bcd8e4abeb8b4fcb19f6a59c92f1a3bad4d7153f333684f93a836e3f9",
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2 changes: 1 addition & 1 deletion ...development/commissioner_dut/struct_pai_vidpid_fallback_encoding_09/test_case_vector.json
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
{
"description": "PAI Test Vector: Fallback VID and PID encoding example from spec: invalid, since substring following Mpid: is not exactly 4 uppercase hexadecimal digits",
"is_success_case": "true",
"is_success_case": "false",
"dac_cert": "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",
"pai_cert": "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",
"certification_declaration": "3081e706092a864886f70d010702a081d93081d6020103310d300b0609608648016503040201304406092a864886f70d010701a0370435152400012501f1ff360204b118250334122c04135a494732303134315a423333303030312d32342405002406002507769824080018317c307a020103801462fa823359acfaa9963e1cfa140addf504f37160300b0609608648016503040201300a06082a8648ce3d0403020446304402201f38b426df25ab4f552ded014845afb1a353e808e9250fc19dcfcab3d717679f0220575a610c996f0221628ff9a76123d3462922f91b6011ba727e6d42884ae88c08",
Expand Down
167 changes: 134 additions & 33 deletions src/crypto/CHIPCryptoPAL.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,8 @@ using chip::Encoding::LittleEndian::Reader;

using namespace chip::ASN1;

namespace chip {
namespace Crypto {
namespace {

constexpr uint8_t kIntegerTag = 0x02u;
Expand Down Expand Up @@ -192,10 +194,111 @@ CHIP_ERROR ConvertIntegerRawToDerInternal(const ByteSpan & raw_integer, MutableB
return CHIP_NO_ERROR;
}

} // namespace
/**
* @brief Find a 4 uppercase hex digit hex value after a prefix string. Used to implement
* fallback CN VID/PID encoding for PAA/PAI/DAC.
*
* @param[in] buffer - buffer in which to find the substring.
* @param[in] prefix - prefix to match, which must be followed by 4 uppercase hex characters
* @param[out] out_hex_value - on CHIP_NO_ERROR return, this will be the 16-bit hex value decoded.
* @return CHIP_NO_ERROR on success, CHIP_ERROR_NOT_FOUND if not detected and
* CHIP_ERROR_WRONG_CERT_DN if we saw the prefix but no valid hex string.
*/
CHIP_ERROR Find16BitUpperCaseHexAfterPrefix(const ByteSpan & buffer, const char * prefix, uint16_t & out_hex_value)
{
chip::CharSpan prefix_span = chip::CharSpan::fromCharString(prefix);

namespace chip {
namespace Crypto {
enum State : int
{
kFindPrefix = 0,
kFindHex = 1,
kFoundHex = 2,
};

size_t min_len_required = prefix_span.size();
bool found_prefix_at_least_once = false;

for (size_t start_idx = 0; start_idx < buffer.size(); start_idx++)
{
State state = State::kFindPrefix;
char hex_buf[4];
size_t hex_len = 0;

// Make a reader starting at the new cursor space as we traverse.
Reader reader{ buffer };
reader.Skip(start_idx);
if (!reader.HasAtLeast(min_len_required))
{
// We possibly can't match anymore since the prefix would not be there.
break;
}

Reader prefix_reader{ reinterpret_cast<const uint8_t *>(prefix_span.data()), prefix_span.size() };

char current_char = '\0';
bool done = false;
while (!done)
{
if (!reader.ReadChar(&current_char).IsSuccess())
{
// Got to the end before getting all we wanted.
break;
}

switch (state)
{
case State::kFindPrefix: {
char prefix_char = '\0';
if (!prefix_reader.ReadChar(&prefix_char).IsSuccess())
{
// Not enough chars to finish prefix.
done = true;
break;
}

if (current_char != prefix_char)
{
// Mismatching char.
done = true;
break;
}

if (prefix_reader.Remaining() == 0)
{
// Reached end of prefix, change to finding the hex string.
state = State::kFindHex;
found_prefix_at_least_once = true;
}
break;
}
case State::kFindHex:
// Accumulate the chars, and just rely on strongly typed hex conversion
// to validate.
hex_buf[hex_len++] = current_char;
if (hex_len == sizeof(hex_buf))
{
if (!Encoding::UppercaseHexToUint16(&hex_buf[0], sizeof(hex_buf), out_hex_value))
{
// Invalid hex, we don't have a candidate.
done = true;
break;
}

state = State::kFoundHex;
return CHIP_NO_ERROR;
}
break;
default:
done = true;
break;
}
}
}

return found_prefix_at_least_once ? CHIP_ERROR_WRONG_CERT_DN : CHIP_ERROR_NOT_FOUND;
}

} // namespace

using HKDF_sha_crypto = HKDF_sha;

Expand Down Expand Up @@ -871,41 +974,39 @@ CHIP_ERROR ExtractVIDPIDFromAttributeString(DNAttrType attrType, const ByteSpan
// Otherwise, it is a CommonName attribute.
else if (!vidpidFromCNAttr.Initialized())
{
char cnAttr[kMax_CommonNameAttr_Length + 1];
if (attr.size() <= chip::Crypto::kMax_CommonNameAttr_Length)
ByteSpan attr_source_span{ attr };
if (attr_source_span.size() > chip::Crypto::kMax_CommonNameAttr_Length)
{
memcpy(cnAttr, attr.data(), attr.size());
cnAttr[attr.size()] = 0;
attr_source_span.reduce_size(chip::Crypto::kMax_CommonNameAttr_Length);
}

char * vid = strstr(cnAttr, kVIDPrefixForCNEncoding);
if (vid != nullptr)
{
vid += strlen(kVIDPrefixForCNEncoding);
if (cnAttr + attr.size() >= vid + kVIDandPIDHexLength)
{
uint16_t matterAttr;
if (Encoding::UppercaseHexToUint16(vid, kVIDandPIDHexLength, matterAttr) == sizeof(matterAttr))
{
vidpidFromCNAttr.mVendorId.SetValue(static_cast<VendorId>(matterAttr));
}
}
}
// Try to find a valid Vendor ID encoded in fallback method.
uint16_t vid = 0;
CHIP_ERROR err = Find16BitUpperCaseHexAfterPrefix(attr_source_span, kVIDPrefixForCNEncoding, vid);
if (err == CHIP_NO_ERROR)
{
vidpidFromCNAttr.mVendorId.SetValue(static_cast<VendorId>(vid));
}
else if (err != CHIP_ERROR_NOT_FOUND)
{
// This indicates a bad/ambiguous format.
return err;
}

char * pid = strstr(cnAttr, kPIDPrefixForCNEncoding);
if (pid != nullptr)
{
pid += strlen(kPIDPrefixForCNEncoding);
if (cnAttr + attr.size() >= pid + kVIDandPIDHexLength)
{
uint16_t matterAttr;
if (Encoding::UppercaseHexToUint16(pid, kVIDandPIDHexLength, matterAttr) == sizeof(matterAttr))
{
vidpidFromCNAttr.mProductId.SetValue(matterAttr);
}
}
}
// Try to find a valid Product ID encoded in fallback method.
uint16_t pid = 0;
err = Find16BitUpperCaseHexAfterPrefix(attr_source_span, kPIDPrefixForCNEncoding, pid);
if (err == CHIP_NO_ERROR)
{
vidpidFromCNAttr.mProductId.SetValue(pid);
}
else if (err != CHIP_ERROR_NOT_FOUND)
{
// This indicates a bad/ambiguous format.
return err;
}
}

return CHIP_NO_ERROR;
}

Expand Down
68 changes: 43 additions & 25 deletions src/crypto/tests/CHIPCryptoPALTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2432,10 +2432,12 @@ static void TestVIDPID_StringExtraction(nlTestSuite * inSuite, void * inContext)
const char * sTestCNAttribute11 = "ACME Matter Devel DAC 5CDA9899 Mvid:FFF1 Mpid:B1";
const char * sTestCNAttribute12 = "ACME Matter Devel DAC 5CDA9899 Mpid: Mvid:FFF1";

// Common Name (CN) VID/PID encoding error cases (more examples):
// Common Name (CN) VID/PID encoding more cases (more examples):
const char * sTestCNAttribute13 = "Mpid:987Mvid:FFF10x";
const char * sTestCNAttribute14 = "MpidMvid:FFF10 Matter Test Mpid:FE67";
const char * sTestCNAttribute14 = "MpidMvid:FFF10 Matter Test Mpid:FE67"; // Valid, even if there is run-in.
const char * sTestCNAttribute15 = "Matter Devel Mpid:Mvid:Fff1";
// Even though "Mpid:" appears thrice, only the value with correct hex afterwards is taken
const char * sTestCNAttribute16 = "Mpid:Mvid:FFF1 Mpid:12cd Matter Test Mpid:FE67";

struct TestCase
{
Expand Down Expand Up @@ -2476,50 +2478,66 @@ static void TestVIDPID_StringExtraction(nlTestSuite * inSuite, void * inContext)
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute07), strlen(sTestCNAttribute07)), true, true, chip::VendorId::TestVendor1, 0x00B1, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute08), strlen(sTestCNAttribute08)), true, true, chip::VendorId::TestVendor1, 0x00B1, CHIP_NO_ERROR },
// Common Name (CN) VID/PID encoding error cases:
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute09), strlen(sTestCNAttribute09)), false, true, chip::VendorId::NotSpecified, 0x00B1, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute10), strlen(sTestCNAttribute10)), false, true, chip::VendorId::NotSpecified, 0x00B1, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute11), strlen(sTestCNAttribute11)), true, false, chip::VendorId::TestVendor1, 0, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute12), strlen(sTestCNAttribute12)), true, false, chip::VendorId::TestVendor1, 0, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute13), strlen(sTestCNAttribute13)), true, false, chip::VendorId::TestVendor1, 0, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute09), strlen(sTestCNAttribute09)), false, false, chip::VendorId::NotSpecified, 0, CHIP_ERROR_WRONG_CERT_DN },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute10), strlen(sTestCNAttribute10)), false, false, chip::VendorId::NotSpecified, 0, CHIP_ERROR_WRONG_CERT_DN },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute11), strlen(sTestCNAttribute11)), false, false, chip::VendorId::NotSpecified, 0, CHIP_ERROR_WRONG_CERT_DN },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute12), strlen(sTestCNAttribute12)), false, false, chip::VendorId::NotSpecified, 0, CHIP_ERROR_WRONG_CERT_DN },
// Common Name (CN) VID/PID encoding additional cases:
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute13), strlen(sTestCNAttribute13)), false, false, chip::VendorId::NotSpecified, 0, CHIP_ERROR_WRONG_CERT_DN },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute14), strlen(sTestCNAttribute14)), true, true, chip::VendorId::TestVendor1, 0xFE67, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute15), strlen(sTestCNAttribute15)), false, false, chip::VendorId::NotSpecified, 0, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute15), strlen(sTestCNAttribute15)), false, false, chip::VendorId::NotSpecified, 0, CHIP_ERROR_WRONG_CERT_DN },
{ DNAttrType::kCommonName, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute16), strlen(sTestCNAttribute16)), true, true, chip::VendorId::TestVendor1, 0xFE67, CHIP_NO_ERROR },
// Other input combinations:
{ DNAttrType::kUnspecified, ByteSpan(reinterpret_cast<const uint8_t *>(sTestCNAttribute15), strlen(sTestCNAttribute15)), false, false, chip::VendorId::NotSpecified, 0, CHIP_NO_ERROR },
{ DNAttrType::kCommonName, ByteSpan(nullptr, 0), false, false, chip::VendorId::NotSpecified, 0, CHIP_ERROR_INVALID_ARGUMENT },
};
// clang-format on

int caseIdx = 0;
for (const auto & testCase : kTestCases)
{
AttestationCertVidPid vidpid;
AttestationCertVidPid vidpidFromCN;
AttestationCertVidPid vidpidToCheck;
CHIP_ERROR result = ExtractVIDPIDFromAttributeString(testCase.attrType, testCase.attr, vidpid, vidpidFromCN);
NL_TEST_ASSERT(inSuite, result == testCase.expectedResult);
ChipLogProgress(Crypto, "Checking VID/PID DN case %d. Expected: %" CHIP_ERROR_FORMAT, caseIdx,
testCase.expectedResult.Format());

if (testCase.attrType == DNAttrType::kMatterVID || testCase.attrType == DNAttrType::kMatterPID)
if (result != testCase.expectedResult)
{
NL_TEST_ASSERT(inSuite, !vidpidFromCN.Initialized());
vidpidToCheck = vidpid;
ChipLogError(Crypto, "Actual result: %" CHIP_ERROR_FORMAT, result.Format());
}
else if (testCase.attrType == DNAttrType::kCommonName)
NL_TEST_ASSERT(inSuite, result == testCase.expectedResult);

// Only do assertions on output params in case of success since otherwise
// many of the output params are intermediate outputs.
if (result == CHIP_NO_ERROR)
{
NL_TEST_ASSERT(inSuite, !vidpid.Initialized());
vidpidToCheck = vidpidFromCN;
}
if (testCase.attrType == DNAttrType::kMatterVID || testCase.attrType == DNAttrType::kMatterPID)
{
NL_TEST_ASSERT(inSuite, !vidpidFromCN.Initialized());
vidpidToCheck = vidpid;
}
else if (testCase.attrType == DNAttrType::kCommonName)
{
NL_TEST_ASSERT(inSuite, !vidpid.Initialized());
vidpidToCheck = vidpidFromCN;
}

NL_TEST_ASSERT(inSuite, vidpidToCheck.mVendorId.HasValue() == testCase.expectedVidPresent);
NL_TEST_ASSERT(inSuite, vidpidToCheck.mProductId.HasValue() == testCase.expectedPidPresent);
NL_TEST_ASSERT(inSuite, vidpidToCheck.mVendorId.HasValue() == testCase.expectedVidPresent);
NL_TEST_ASSERT(inSuite, vidpidToCheck.mProductId.HasValue() == testCase.expectedPidPresent);

if (testCase.expectedVidPresent)
{
NL_TEST_ASSERT(inSuite, vidpidToCheck.mVendorId.Value() == testCase.expectedVid);
}
if (testCase.expectedVidPresent)
{
NL_TEST_ASSERT(inSuite, vidpidToCheck.mVendorId.Value() == testCase.expectedVid);
}

if (testCase.expectedPidPresent)
{
NL_TEST_ASSERT(inSuite, vidpidToCheck.mProductId.Value() == testCase.expectedPid);
if (testCase.expectedPidPresent)
{
NL_TEST_ASSERT(inSuite, vidpidToCheck.mProductId.Value() == testCase.expectedPid);
}
}
++caseIdx;
}
}

Expand Down
1 change: 1 addition & 0 deletions src/lib/support/BufferReader.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,7 @@ Reader & Reader::ReadBytes(uint8_t * dest, size_t size)
}

// Explicit Read instantiations for the data types we want to support.
template void Reader::RawReadLowLevelBeCareful(char *);
template void Reader::RawReadLowLevelBeCareful(bool *);
template void Reader::RawReadLowLevelBeCareful(int8_t *);
template void Reader::RawReadLowLevelBeCareful(int16_t *);
Expand Down
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