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[Processors] Mime-Type Detection (elastic#22940)
* Add mimetype processor * Add mimetype detection for packetbeat * Update changelog * Rev go.sum * Refactor for reusability and rename to detect_mime_type * reformat imports * update docs * Update maxHeaderSize name and add comment on the fallback behavior (cherry picked from commit 5f52979)
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Andrew Stucki
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Dec 8, 2020
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@@ -10142,11 +10142,11 @@ Contents of probable licence file $GOMODCACHE/github.com/gorhill/[email protected] | |
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| -------------------------------------------------------------------------------- | ||
| Dependency : github.com/h2non/filetype | ||
| Version: v1.0.12 | ||
| Version: v1.1.1-0.20201130172452-f60988ab73d5 | ||
| Licence type (autodetected): MIT | ||
| -------------------------------------------------------------------------------- | ||
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| Contents of probable licence file $GOMODCACHE/github.com/h2non/filetype@v1.0.12/LICENSE: | ||
| Contents of probable licence file $GOMODCACHE/github.com/h2non/filetype@v1.1.1-0.20201130172452-f60988ab73d5/LICENSE: | ||
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| The MIT License | ||
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| @@ -0,0 +1,76 @@ | ||
| // Licensed to Elasticsearch B.V. under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. Elasticsearch B.V. licenses this file to you under | ||
| // the Apache License, Version 2.0 (the "License"); you may | ||
| // not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
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| package mime | ||
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| import ( | ||
| "encoding/json" | ||
| "encoding/xml" | ||
| "net/http" | ||
| "strings" | ||
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| "github.com/h2non/filetype" | ||
| ) | ||
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| const ( | ||
| // size for mime detection, office file | ||
| // detection requires ~8kb to detect properly | ||
| maxHeaderSize = 8192 | ||
| ) | ||
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| // DetectBytes tries to detect a mime-type based off | ||
| // of a chunk of bytes passed into the function | ||
| func DetectBytes(data []byte) string { | ||
| header := data | ||
| if len(data) > maxHeaderSize { | ||
| header = data[:maxHeaderSize] | ||
| } | ||
| kind, err := filetype.Match(header) | ||
| if err == nil && kind != filetype.Unknown { | ||
| // we have a known filetype, return | ||
| return kind.MIME.Value | ||
| } | ||
| // if the above fails, try and sniff with http sniffing | ||
| netType := http.DetectContentType(header) | ||
| // try and parse any sort of text as json or xml | ||
| if strings.HasPrefix(netType, "text/plain") { | ||
| if detected := detectEncodedText(data); detected != "" { | ||
| return detected | ||
| } | ||
| } | ||
| // The fallback for http.DetectContentType is "application/octet-stream" | ||
| // meaning that if we see it, we were unable to determine the type and | ||
| // we just know we're dealing with a chunk of some sort of bytes. Rather | ||
| // than reporting the fallback, we'll just say we were unable to detect | ||
| // the type. | ||
| if netType == "application/octet-stream" { | ||
| return "" | ||
| } | ||
| return netType | ||
| } | ||
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| func detectEncodedText(data []byte) string { | ||
| // figure out how to optimize this so we don't have to try and parse the whole payload | ||
| // every time | ||
| if json.Valid(data) { | ||
| return "application/json" | ||
| } | ||
| if xml.Unmarshal(data, new(interface{})) == nil { | ||
| return "text/xml" | ||
| } | ||
| return "" | ||
| } |
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| // Licensed to Elasticsearch B.V. under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. Elasticsearch B.V. licenses this file to you under | ||
| // the Apache License, Version 2.0 (the "License"); you may | ||
| // not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
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| package mime | ||
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| import ( | ||
| "encoding/hex" | ||
| "testing" | ||
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| "github.com/stretchr/testify/require" | ||
| ) | ||
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| func TestMimeType(t *testing.T) { | ||
| tests := []struct { | ||
| name string | ||
| expectedType string | ||
| body string | ||
| }{ | ||
| { | ||
| name: "html", | ||
| expectedType: "text/html; charset=utf-8", | ||
| body: "<html>Test</html>", | ||
| }, | ||
| { | ||
| name: "pe", | ||
| expectedType: "application/vnd.microsoft.portable-executable", | ||
| body: convertToData(t, "4d5a90000300000004000000ffff"), | ||
| }, | ||
| { | ||
| name: "elf", | ||
| expectedType: "application/x-executable", | ||
| body: convertToData(t, "7f454c460101010000000000000000000300030001000000f0dc01003400000080a318000000000034002000080028001e001d0001"), | ||
| }, | ||
| { | ||
| name: "macho", | ||
| expectedType: "application/x-mach-binary", | ||
| body: convertToData(t, "cffaedfe0700000103000000020000001000000058050000850020000000000019000000480000005f5f504147455a45524f"), | ||
| }, | ||
| { | ||
| name: "json", | ||
| expectedType: "application/json", | ||
| body: "{}", | ||
| }, | ||
| { | ||
| name: "xml", | ||
| expectedType: "text/xml", | ||
| body: "<test></test>", | ||
| }, | ||
| { | ||
| name: "text", | ||
| expectedType: "text/plain; charset=utf-8", | ||
| body: "Hello world!", | ||
| }, | ||
| { | ||
| name: "png", | ||
| expectedType: "image/png", | ||
| body: convertToData(t, "89504e470d0a1a0a0000000d494844520000025800000258080200000031040f8b0000000467414d410000b18f0bfc610500"), | ||
| }, | ||
| } | ||
| for _, test := range tests { | ||
| t.Run(test.name, func(t *testing.T) { | ||
| require.Equal(t, test.expectedType, Detect(test.body)) | ||
| }) | ||
| } | ||
| } | ||
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| func convertToData(t *testing.T, sample string) string { | ||
| t.Helper() | ||
| decoded, err := hex.DecodeString(sample) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| return string(decoded) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| // Licensed to Elasticsearch B.V. under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. Elasticsearch B.V. licenses this file to you under | ||
| // the Apache License, Version 2.0 (the "License"); you may | ||
| // not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
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| package mime | ||
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| // Detect tries to detect a mime-type based off | ||
| // of a byte string passed into the function | ||
| func Detect(data string) string { | ||
| return DetectBytes([]byte(data)) | ||
| } |
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|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| // Licensed to Elasticsearch B.V. under one or more contributor | ||
| // license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright | ||
| // ownership. Elasticsearch B.V. licenses this file to you under | ||
| // the Apache License, Version 2.0 (the "License"); you may | ||
| // not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
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| package actions | ||
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| import ( | ||
| "fmt" | ||
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| "github.com/pkg/errors" | ||
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| "github.com/elastic/beats/v7/libbeat/beat" | ||
| "github.com/elastic/beats/v7/libbeat/common" | ||
| "github.com/elastic/beats/v7/libbeat/mime" | ||
| "github.com/elastic/beats/v7/libbeat/processors" | ||
| "github.com/elastic/beats/v7/libbeat/processors/checks" | ||
| ) | ||
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| func init() { | ||
| processors.RegisterPlugin("detect_mime_type", | ||
| checks.ConfigChecked(NewDetectMimeType, | ||
| checks.RequireFields("field", "target"), | ||
| checks.AllowedFields("field", "target"))) | ||
| } | ||
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| type mimeTypeProcessor struct { | ||
| Field string `config:"field"` | ||
| Target string `config:"target"` | ||
| } | ||
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| // NewDetectMimeType constructs a new mime processor. | ||
| func NewDetectMimeType(cfg *common.Config) (processors.Processor, error) { | ||
| mimeType := &mimeTypeProcessor{} | ||
| if err := cfg.Unpack(mimeType); err != nil { | ||
| return nil, errors.Wrapf(err, "fail to unpack the detect_mime_type configuration") | ||
| } | ||
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| return mimeType, nil | ||
| } | ||
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| func (m *mimeTypeProcessor) Run(event *beat.Event) (*beat.Event, error) { | ||
| valI, err := event.GetValue(m.Field) | ||
| if err != nil { | ||
| // doesn't have the required fieldd value to analyze | ||
| return event, nil | ||
| } | ||
| val, _ := valI.(string) | ||
| if val == "" { | ||
| // wrong type or not set | ||
| return event, nil | ||
| } | ||
| if mimeType := mime.Detect(val); mimeType != "" { | ||
| event.Fields.DeepUpdate(common.MapStr{ | ||
| m.Target: mimeType, | ||
| }) | ||
| } | ||
| return event, nil | ||
| } | ||
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| func (m *mimeTypeProcessor) String() string { | ||
| return fmt.Sprintf("detect_mime_type=%+v->%+v", m.Field, m.Target) | ||
| } |
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