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Add guest package for fetching attestation report via syscall (#1341)
Add `internal/guest/linux package`, which contains linux ioctl definitions. Devicemapper code is refactored to use the new package. Introduce new `amdsevsnp` package with Introduce ioctl wrappers and structs required to fetch attestation report. Validate that `LaunchData` provided to HCS during UVM boot and `HostData` returned as part of attestation report match. Add utility binary to fetch SNP report and update Makefile to support `DEV_BUILD` parameter, which includes test utilities inside LCOW image. Fake attestation report can be used when testing integrations. Signed-off-by: Maksim An <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| //go:build linux | ||
| // +build linux | ||
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| // Package linux contains definitions required for making a linux ioctl. | ||
| package linux | ||
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| import ( | ||
| "os" | ||
| "unsafe" | ||
|
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| "golang.org/x/sys/unix" | ||
| ) | ||
|
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| // 32 bits to describe an ioctl: | ||
| // 0-7: NR (command for a given ioctl type) | ||
| // 8-15: TYPE (ioctl type) | ||
| // 16-29: SIZE (payload size) | ||
| // 30-31: DIR (direction of ioctl, can be: none/write/read/write-read) | ||
| const ( | ||
| IocWrite = 1 | ||
| IocRead = 2 | ||
| IocNRBits = 8 | ||
| IocTypeBits = 8 | ||
| IocSizeBits = 14 | ||
| IocDirBits = 2 | ||
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| IocNRMask = (1 << IocNRBits) - 1 | ||
| IocTypeMask = (1 << IocTypeBits) - 1 | ||
| IocSizeMask = (1 << IocSizeBits) - 1 | ||
| IocDirMask = (1 << IocDirBits) - 1 | ||
| IocTypeShift = IocNRBits | ||
| IocSizeShift = IocTypeShift + IocTypeBits | ||
| IocDirShift = IocSizeShift + IocSizeBits | ||
| IocWRBase = (IocRead | IocWrite) << IocDirShift | ||
| ) | ||
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| // Ioctl makes a syscall described by `command` with data `dataPtr` to device | ||
| // driver file `f`. | ||
| func Ioctl(f *os.File, command int, dataPtr unsafe.Pointer) error { | ||
| if _, _, err := unix.Syscall( | ||
| unix.SYS_IOCTL, | ||
| f.Fd(), | ||
| uintptr(command), | ||
| uintptr(dataPtr), | ||
| ); err != 0 { | ||
| return err | ||
| } | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| //go:build linux | ||
| // +build linux | ||
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| package hcsv2 | ||
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| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "os" | ||
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| "github.com/Microsoft/hcsshim/pkg/amdsevsnp" | ||
| ) | ||
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| // validateHostData fetches SNP report (if applicable) and validates `hostData` against | ||
| // HostData set at UVM launch. | ||
| func validateHostData(hostData []byte) error { | ||
| report, err := amdsevsnp.FetchParsedSNPReport(nil) | ||
| if err != nil { | ||
| // For non-SNP hardware /dev/sev will not exist | ||
| if os.IsNotExist(err) { | ||
| return nil | ||
| } | ||
| return err | ||
| } | ||
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| if bytes.Compare(hostData, report.HostData) != 0 { | ||
| return fmt.Errorf( | ||
| "security policy digest %q doesn't match HostData provided at launch %q", | ||
| hostData, | ||
| report.HostData, | ||
| ) | ||
| } | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| //go:build linux | ||
| // +build linux | ||
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| package fake | ||
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| import ( | ||
| "encoding/hex" | ||
| "fmt" | ||
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| "github.com/Microsoft/hcsshim/pkg/amdsevsnp" | ||
| ) | ||
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| const fakeSNPReport = "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" | ||
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| // FetchRawSNPReport hex decodes fakeSNPReport. | ||
| func FetchRawSNPReport() ([]byte, error) { | ||
| return hex.DecodeString(fakeSNPReport) | ||
| } | ||
|
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| // FetchSNPReport returns amdsev.Report object that corresponds to the decoded | ||
| // version of fakeSNPReport. Overrides the resulting report's HostData field | ||
| // with provided `hostData`. | ||
| func FetchSNPReport(hostData string) (amdsevsnp.Report, error) { | ||
| if hostData == "" { | ||
| hostData = "28603a3ea835a83bd688b0ec1dcb36b6b8c22412e5b63115b75db8628b989bc5" | ||
| } | ||
| hdBytes, err := hex.DecodeString(hostData) | ||
| if err != nil { | ||
| return amdsevsnp.Report{}, fmt.Errorf("failed to decode host data: %w", err) | ||
| } | ||
| r := amdsevsnp.Report{ | ||
| Version: 1, | ||
| GuestSVN: 1, | ||
| Policy: 0x03001f, | ||
| FamilyID: "00000000000000000000000000000001", | ||
| ImageID: "00000000000000000000000000000001", | ||
| VMPL: 0, | ||
| SignatureAlgo: 1, | ||
| PlatformVersion: 0x2800000000000000, | ||
| PlatformInfo: 1, | ||
| AuthorKeyEn: 0, | ||
| ReportData: "7ab000a323b3c873f5b81bbe584e7c1a26bcf40dc27e00f8e0d144b1ed2d14f10000000000000000000000000000000000000000000000000000000000000000", | ||
| Measurement: "e29af700e85b39996fa38226d2804b78cad746ffef4477360a61b47874bdecd640f9d32f5ff64a55baad3c545484d9ed", | ||
| HostData: hdBytes[:], | ||
| IDKeyDigest: "98c475ca5f7683e8d351e7e789a1baff19041750567161ad52bf0d152bd76d7c6f313d0a0fd72d0089692c18f5211558", | ||
| AuthorKeyDigest: "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", | ||
| ReportID: "40aea62690b08eb6d680392c9a9b3db56a9b3cc44083b9da31fb88bcfc493407", | ||
| ReportIDMA: "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", | ||
| ReportTCB: 0x2800000000000000, | ||
| ChipID: "e6c86796cd44b0bc6b7c0d4fdab33e2807e14b5fc4538b3750921169d97bcf4447c7d3ab2a7c25f74c1641e2885c1011d025cc536f5c9a2504713136c7877f48", | ||
| CommittedSVN: "0000000000000000", | ||
| CommittedVersion: "0000000000000000", | ||
| LaunchSVN: "0000000000000000", | ||
| Signature: "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", | ||
| } | ||
| return r, nil | ||
| } |
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