Messages in this thread Patch in this message | | | From | Kuppuswamy Sathyanarayanan <> | Subject | [PATCH v9 6/6] selftests: tdx: Test GetQuote TDX attestation feature | Date | Wed, 27 Jul 2022 20:44:20 -0700 |
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In TDX guest, the second stage of the attestation process is Quote generation. This process is required to convert the locally generated TDREPORT into a remotely verifiable Quote. It involves sending the TDREPORT data to a Quoting Enclave (QE) which will verify the integerity of the TDREPORT and sign it with an attestation key.
Intel's TDX attestation driver exposes TDX_CMD_GET_QUOTE IOCTL to allow user agent get the TD Quote.
Add a kernel selftest module to verify the Quote generation feature.
TD Quote generation involves following steps:
* Get the TDREPORT data using TDX_CMD_GET_REPORT IOCTL. * Embed the TDREPORT data in quote buffer and request for quote generation via TDX_CMD_GET_QUOTE IOCTL request. * Upon completion of the GetQuote request, check for non zero value in the status field of Quote header to make sure the generated quote is valid.
Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> --- tools/testing/selftests/tdx/tdx_attest_test.c | 74 ++++++++++++++++--- 1 file changed, 64 insertions(+), 10 deletions(-)
diff --git a/tools/testing/selftests/tdx/tdx_attest_test.c b/tools/testing/selftests/tdx/tdx_attest_test.c index 7155cc751eaa..14125b97e308 100644 --- a/tools/testing/selftests/tdx/tdx_attest_test.c +++ b/tools/testing/selftests/tdx/tdx_attest_test.c @@ -23,6 +23,7 @@ #define devname "/dev/tdx-guest" #define HEX_DUMP_SIZE 8 +#define QUOTE_SIZE 8192 /* * struct td_info - It contains the measurements and initial configuration of @@ -114,17 +115,11 @@ static void print_array_hex(const char *title, const char *prefix_str, } #endif -TEST(verify_report) +/* Helper function to get TDREPORT */ +long get_tdreport(int devfd, __u8 *reportdata, __u8 *tdreport) { - __u8 reportdata[TDX_REPORTDATA_LEN]; - struct tdreport_data *tdr_data; - __u8 tdreport[TDX_REPORT_LEN]; struct tdx_report_req req; - int devfd, i; - - devfd = open(devname, O_RDWR | O_SYNC); - - ASSERT_LT(0, devfd); + int i; /* Generate sample report data */ for (i = 0; i < TDX_REPORTDATA_LEN; i++) @@ -137,8 +132,22 @@ TEST(verify_report) req.tdreport = (__u64)tdreport; req.tdr_len = TDX_REPORT_LEN; + return ioctl(devfd, TDX_CMD_GET_REPORT, &req); +} + +TEST(verify_report) +{ + __u8 reportdata[TDX_REPORTDATA_LEN]; + struct tdreport_data *tdr_data; + __u8 tdreport[TDX_REPORT_LEN]; + int devfd; + + devfd = open(devname, O_RDWR | O_SYNC); + + ASSERT_LT(0, devfd); + /* Get TDREPORT */ - ASSERT_EQ(0, ioctl(devfd, TDX_CMD_GET_REPORT, &req)); + ASSERT_EQ(0, get_tdreport(devfd, reportdata, tdreport)); tdr_data = (struct tdreport_data *)tdreport; @@ -157,4 +166,49 @@ TEST(verify_report) ASSERT_EQ(0, close(devfd)); } +TEST(verify_quote) +{ + __u8 reportdata[TDX_REPORTDATA_LEN]; + struct tdx_quote_hdr *quote_hdr; + struct tdx_quote_req quote_req; + __u8 *quote_buf = NULL; + __u64 quote_buf_size; + int devfd; + + /* Open attestation device */ + devfd = open(devname, O_RDWR | O_SYNC); + + ASSERT_LT(0, devfd); + + /* Add size for quote header */ + quote_buf_size = sizeof(*quote_hdr) + QUOTE_SIZE; + + /* Allocate quote buffer */ + quote_buf = malloc(quote_buf_size); + ASSERT_NE(NULL, quote_buf); + + quote_hdr = (struct tdx_quote_hdr *)quote_buf; + + /* Initialize GetQuote header */ + quote_hdr->version = 1; + quote_hdr->status = GET_QUOTE_SUCCESS; + quote_hdr->in_len = TDX_REPORT_LEN; + quote_hdr->out_len = 0; + + /* Get TDREPORT data */ + ASSERT_EQ(0, get_tdreport(devfd, reportdata, + (__u8 *)"e_hdr->data)); + + /* Fill GetQuote request */ + quote_req.buf = (__u64)quote_buf; + quote_req.len = quote_buf_size; + + ASSERT_EQ(0, ioctl(devfd, TDX_CMD_GET_QUOTE, "e_req)); + + /* Check whether GetQuote request is successful */ + EXPECT_EQ(0, quote_hdr->status); + + free(quote_buf); +} + TEST_HARNESS_MAIN -- 2.25.1
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