feat: syft attestor

Adds an attestor that creates a SBOM using syft for a provided source or
an automatically detected image tar file from the context's products.

Signed-off-by: Mikhail Swift <mikhail@testifysec.com>

go.mod

@@ -3,26 +3,77 @@ module github.com/testifysec/witness
 go 1.17
 
 require (
+	github.com/anchore/stereoscope v0.0.0-20220307154759-8a5a70c227d3
+	github.com/anchore/syft v0.41.0
 	github.com/davecgh/go-spew v1.1.1
 	github.com/go-git/go-git/v5 v5.4.2
-	github.com/go-openapi/runtime v0.21.0
+	github.com/go-openapi/runtime v0.23.1
 	github.com/open-policy-agent/opa v0.37.0
 	github.com/owenrumney/go-sarif v1.1.1
-	github.com/sigstore/rekor v0.4.0
+	github.com/sigstore/rekor v0.4.1-0.20220114213500-23f583409af3
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/cobra v1.3.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.10.1
-	github.com/spiffe/go-spiffe/v2 v2.0.0-beta.10
+	github.com/spiffe/go-spiffe/v2 v2.0.0-beta.12
 	github.com/stretchr/testify v1.7.0
-	golang.org/x/sys v0.0.0-20220114195835-da31bd327af9
+	golang.org/x/sys v0.0.0-20220209214540-3681064d5158
 	google.golang.org/grpc v1.44.0
 	gopkg.in/square/go-jose.v2 v2.6.0
 )
 
 require (
+	github.com/CycloneDX/cyclonedx-go v0.4.0 // indirect
+	github.com/acobaugh/osrelease v0.1.0 // indirect
+	github.com/anchore/go-rpmdb v0.0.0-20210914181456-a9c52348da63 // indirect
+	github.com/anchore/go-version v1.2.2-0.20200701162849-18adb9c92b9b // indirect
+	github.com/anchore/packageurl-go v0.0.0-20210922164639-b3fa992ebd29 // indirect
+	github.com/andybalholm/brotli v1.0.4 // indirect
+	github.com/bmatcuk/doublestar/v4 v4.0.2 // indirect
+	github.com/containerd/containerd v1.5.10 // indirect
+	github.com/containerd/stargz-snapshotter/estargz v0.10.1 // indirect
+	github.com/docker/cli v20.10.12+incompatible // indirect
+	github.com/docker/distribution v2.8.0+incompatible // indirect
+	github.com/docker/docker v20.10.12+incompatible // indirect
+	github.com/docker/docker-credential-helpers v0.6.4 // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.4.0 // indirect
+	github.com/dsnet/compress v0.0.2-0.20210315054119-f66993602bf5 // indirect
+	github.com/dustin/go-humanize v1.0.0 // indirect
+	github.com/facebookincubator/nvdtools v0.1.4 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.0 // indirect
+	github.com/go-restruct/restruct v1.2.0-alpha // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/google/go-cmp v0.5.7 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/jinzhu/copier v0.3.2 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/klauspost/compress v1.14.2 // indirect
+	github.com/klauspost/pgzip v1.2.5 // indirect
+	github.com/mattn/go-runewidth v0.0.13 // indirect
+	github.com/mholt/archiver/v3 v3.5.1 // indirect
+	github.com/mitchellh/hashstructure/v2 v2.0.2 // indirect
+	github.com/moby/term v0.0.0-20210619224110-3f7ff695adc6 // indirect
+	github.com/nwaples/rardecode v1.1.0 // indirect
+	github.com/olekukonko/tablewriter v0.0.5 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.0.3-0.20220114050600-8b9d41f48198 // indirect
+	github.com/pierrec/lz4/v4 v4.1.2 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
+	github.com/scylladb/go-set v1.0.2 // indirect
+	github.com/spdx/tools-golang v0.2.0 // indirect
+	github.com/ulikunitz/xz v0.5.10 // indirect
+	github.com/vbatts/tar-split v0.11.2 // indirect
+	github.com/vifraa/gopom v0.1.0 // indirect
+	github.com/wagoodman/go-partybus v0.0.0-20210627031916-db1f5573bbc5 // indirect
+	github.com/wagoodman/go-progress v0.0.0-20200731105512-1020f39e6240 // indirect
+	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
 	github.com/zclconf/go-cty v1.10.0 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 )
 
 require (
@@ -33,32 +84,32 @@ require (
 	github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect
 	github.com/acomagu/bufpipe v1.0.3 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d // indirect
-	github.com/aws/aws-sdk-go v1.42.32
+	github.com/aws/aws-sdk-go v1.43.0
 	github.com/blang/semver v3.5.1+incompatible // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
-	github.com/cyberphone/json-canonicalization v0.0.0-20210303052042-6bc126869bf4 // indirect
+	github.com/cyberphone/json-canonicalization v0.0.0-20210823021906-dc406ceaf94b // indirect
 	github.com/emirpasic/gods v1.12.0 // indirect
 	github.com/fsnotify/fsnotify v1.5.1 // indirect
 	github.com/ghodss/yaml v1.0.0 // indirect
 	github.com/go-chi/chi v4.1.2+incompatible // indirect
 	github.com/go-git/gcfg v1.5.0 // indirect
 	github.com/go-git/go-billy/v5 v5.3.1 // indirect
-	github.com/go-openapi/analysis v0.20.1 // indirect
-	github.com/go-openapi/errors v0.20.1 // indirect
+	github.com/go-openapi/analysis v0.21.2 // indirect
+	github.com/go-openapi/errors v0.20.2 // indirect
 	github.com/go-openapi/jsonpointer v0.19.5 // indirect
 	github.com/go-openapi/jsonreference v0.19.6 // indirect
-	github.com/go-openapi/loads v0.21.0 // indirect
+	github.com/go-openapi/loads v0.21.1 // indirect
 	github.com/go-openapi/spec v0.20.4 // indirect
-	github.com/go-openapi/strfmt v0.21.1 // indirect
-	github.com/go-openapi/swag v0.19.15 // indirect
-	github.com/go-openapi/validate v0.20.3 // indirect
+	github.com/go-openapi/strfmt v0.21.2 // indirect
+	github.com/go-openapi/swag v0.21.1 // indirect
+	github.com/go-openapi/validate v0.21.0 // indirect
 	github.com/go-playground/locales v0.14.0 // indirect
 	github.com/go-playground/universal-translator v0.18.0 // indirect
 	github.com/go-playground/validator/v10 v10.10.0 // indirect
-	github.com/go-stack/stack v1.8.0 // indirect
+	github.com/go-stack/stack v1.8.1 // indirect
 	github.com/gobwas/glob v0.2.3 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/google/go-containerregistry v0.7.1-0.20211118220127-abdc633f8305 // indirect
+	github.com/google/go-containerregistry v0.8.1-0.20220209165246-a44adc326839
 	github.com/hashicorp/hcl v1.0.1-0.20190430135223-99e2f22d1c94 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/in-toto/in-toto-golang v0.3.4-0.20211211042327-af1f9fb822bf // indirect
@@ -79,30 +130,30 @@ require (
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/sassoftware/relic v0.0.0-20210427151427-dfb082b79b74 // indirect
-	github.com/secure-systems-lab/go-securesystemslib v0.3.0 // indirect
+	github.com/secure-systems-lab/go-securesystemslib v0.3.1 // indirect
 	github.com/sergi/go-diff v1.2.0 // indirect
 	github.com/shibumi/go-pathspec v1.3.0 // indirect
-	github.com/sigstore/sigstore v1.0.2-0.20211210190220-04746d994282 // indirect
-	github.com/spf13/afero v1.6.0 // indirect
+	github.com/sigstore/sigstore v1.1.1-0.20220217212907-e48ca03a5ba7 // indirect
+	github.com/spf13/afero v1.8.0 // indirect
 	github.com/spf13/cast v1.4.1 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/subosito/gotenv v1.2.0 // indirect
-	github.com/theupdateframework/go-tuf v0.0.0-20211203210025-7ded50136bf9 // indirect
+	github.com/theupdateframework/go-tuf v0.0.0-20220211205608-f0c3294f63b9 // indirect
 	github.com/xanzy/ssh-agent v0.3.0 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/yashtewari/glob-intersection v0.0.0-20180916065949-5c77d914dd0b // indirect
 	github.com/zeebo/errs v1.2.2 // indirect
-	go.mongodb.org/mongo-driver v1.7.5 // indirect
+	go.mongodb.org/mongo-driver v1.8.3 // indirect
 	go.uber.org/atomic v1.9.0 // indirect
 	go.uber.org/multierr v1.7.0 // indirect
-	go.uber.org/zap v1.20.0 // indirect
-	golang.org/x/crypto v0.0.0-20211209193657-4570a0811e8b // indirect
+	go.uber.org/zap v1.21.0 // indirect
+	golang.org/x/crypto v0.0.0-20220213190939-1e6e3497d506 // indirect
 	golang.org/x/mod v0.5.1 // indirect
-	golang.org/x/net v0.0.0-20211216030914-fe4d6282115f // indirect
+	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd // indirect
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
 	golang.org/x/text v0.3.7 // indirect
-	google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa // indirect
+	google.golang.org/genproto v0.0.0-20220218161850-94dd64e39d7c // indirect
 	google.golang.org/protobuf v1.27.1 // indirect
 	gopkg.in/ini.v1 v1.66.2 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
@@ -111,3 +162,7 @@ require (
 )
 
 replace github.com/sigstore/rekor => github.com/testifysec/rekor v0.4.0-dsse-intermediates-2
+
+replace github.com/gin-gonic/gin v1.5.0 => github.com/gin-gonic/gin v1.7.7
+
+replace github.com/opencontainers/image-spec => github.com/opencontainers/image-spec v1.0.3-0.20220303224323-02efb9a75ee1