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Post Policy Form: exhaustive post policy check (#3386)

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Add support of all conditions check described in
http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html
and simplify a little bit the existing code
master
Anis Elleuch 8 years ago committed by Harshavardhana
parent 4a9b205a15
commit 85bb5870a9
2 changed files with 93 additions and 43 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 98
      cmd/postpolicyform.go
  2. 38
      cmd/postpolicyform_test.go

98
cmd/postpolicyform.go
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@ -20,6 +20,7 @@ import (
"encoding/json"
"errors"
"fmt"
"net/http"
"reflect"
"strconv"
"strings"
@ -35,6 +36,11 @@ func toString(val interface{}) string {
return ""
}
// toLowerString - safely convert interface to lower string
func toLowerString(val interface{}) string {
return strings.ToLower(toString(val))
}
// toInteger _ Safely convert interface to integer without causing panic.
func toInteger(val interface{}) (int64, error) {
switch v := val.(type) {
@ -117,7 +123,7 @@ func parsePostPolicyForm(policy string) (PostPolicyForm, error) {
}
// {"acl": "public-read" } is an alternate way to indicate - [ "eq", "$acl", "public-read" ]
// In this case we will just collapse this into "eq" for all use cases.
parsedPolicy.Conditions.Policies["$"+k] = struct {
parsedPolicy.Conditions.Policies["$"+strings.ToLower(k)] = struct {
Operator string
Value string
}{
@ -129,7 +135,7 @@ func parsePostPolicyForm(policy string) (PostPolicyForm, error) {
if len(condt) != 3 { // Return error if we have insufficient elements.
return parsedPolicy, fmt.Errorf("Malformed conditional fields %s of type %s found in POST policy form", condt, reflect.TypeOf(condt).String())
}
switch toString(condt[0]) {
switch toLowerString(condt[0]) {
case "eq", "starts-with":
for _, v := range condt { // Pre-check all values for type.
if !isString(v) {
@ -137,7 +143,7 @@ func parsePostPolicyForm(policy string) (PostPolicyForm, error) {
return parsedPolicy, fmt.Errorf("Unknown type %s of conditional field value %s found in POST policy form", reflect.TypeOf(condt).String(), condt)
}
}
operator, matchType, value := toString(condt[0]), toString(condt[1]), toString(condt[2])
operator, matchType, value := toLowerString(condt[0]), toLowerString(condt[1]), toString(condt[2])
parsedPolicy.Conditions.Policies[matchType] = struct {
Operator string
Value string
@ -174,40 +180,74 @@ func parsePostPolicyForm(policy string) (PostPolicyForm, error) {
return parsedPolicy, nil
}
// startWithConds - map which indicates if a given condition supports starts-with policy operator
var startsWithConds = map[string]bool{
"$acl": true,
"$bucket": false,
"$cache-control": true,
"$content-type": true,
"$content-disposition": true,
"$content-encoding": true,
"$expires": true,
"$key": true,
"$success_action_redirect": true,
"$redirect": true,
"$success_action_status": false,
"$x-amz-algorithm": false,
"$x-amz-credential": false,
"$x-amz-date": false,
}
// checkPolicyCond returns a boolean to indicate if a condition is satisified according
// to the passed operator
func checkPolicyCond(op string, input1, input2 string) bool {
switch op {
case "eq":
return input1 == input2
case "starts-with":
return strings.HasPrefix(input1, input2)
}
return false
}
// checkPostPolicy - apply policy conditions and validate input values.
// (http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html)
func checkPostPolicy(formValues map[string]string, postPolicyForm PostPolicyForm) APIErrorCode {
// Check if policy document expiry date is still not reached
if !postPolicyForm.Expiration.After(time.Now().UTC()) {
return ErrPolicyAlreadyExpired
}
if postPolicyForm.Conditions.Policies["$bucket"].Operator == "eq" {
if formValues["Bucket"] != postPolicyForm.Conditions.Policies["$bucket"].Value {
return ErrAccessDenied
}
}
if postPolicyForm.Conditions.Policies["$x-amz-date"].Operator == "eq" {
if formValues["X-Amz-Date"] != postPolicyForm.Conditions.Policies["$x-amz-date"].Value {
return ErrAccessDenied
}
}
if postPolicyForm.Conditions.Policies["$Content-Type"].Operator == "starts-with" {
if !strings.HasPrefix(formValues["Content-Type"], postPolicyForm.Conditions.Policies["$Content-Type"].Value) {
return ErrAccessDenied
}
}
if postPolicyForm.Conditions.Policies["$Content-Type"].Operator == "eq" {
if formValues["Content-Type"] != postPolicyForm.Conditions.Policies["$Content-Type"].Value {
return ErrAccessDenied
}
}
if postPolicyForm.Conditions.Policies["$key"].Operator == "starts-with" {
if !strings.HasPrefix(formValues["Key"], postPolicyForm.Conditions.Policies["$key"].Value) {
return ErrAccessDenied
// Flag to indicate if all policies conditions are satisfied
condPassed := true
// Iterate over policy conditions and check them against received form fields
for cond, v := range postPolicyForm.Conditions.Policies {
// Form fields names are in canonical format, convert conditions names
// to canonical for simplification purpose, so `$key` will become `Key`
formCanonicalName := http.CanonicalHeaderKey(strings.TrimPrefix(cond, "$"))
// Operator for the current policy condition
op := v.Operator
// If the current policy condition is known
if startsWithSupported, condFound := startsWithConds[cond]; condFound {
// Check if the current condition supports starts-with operator
if op == "starts-with" && !startsWithSupported {
return ErrAccessDenied
}
// Check if current policy condition is satisfied
condPassed = checkPolicyCond(op, formValues[formCanonicalName], v.Value)
} else {
// This covers all conditions X-Amz-Meta-* and X-Amz-*
if strings.HasPrefix(cond, "$x-amz-meta-") || strings.HasPrefix(cond, "$x-amz-") {
// Check if policy condition is satisfied
condPassed = checkPolicyCond(op, formValues[formCanonicalName], v.Value)
}
}
}
if postPolicyForm.Conditions.Policies["$key"].Operator == "eq" {
if formValues["Key"] != postPolicyForm.Conditions.Policies["$key"].Value {
// Check if current policy condition is satisfied, quit immediatly otherwise
if !condPassed {
return ErrAccessDenied
}
}
return ErrNone
}

38
cmd/postpolicyform_test.go
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@ -25,39 +25,49 @@ import (
func TestPostPolicyForm(t *testing.T) {
type testCase struct {
Bucket string
Key string
XAmzDate string
XAmzAlgorithm string
ContentType string
Policy string
ErrCode APIErrorCode
Bucket string
Key string
Acl string
XAmzDate string
XAmzServerSideEncryption string
XAmzAlgorithm string
XAmzCredential string
XAmzMetaUuid string
ContentType string
SuccessActionRedirect string
Policy string
ErrCode APIErrorCode
}
testCases := []testCase{
// Different AMZ date
{Bucket: "testbucket", Key: "user/user1/filename/${filename}/myfile.txt", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
{Bucket: "testbucket", Key: "user/user1/filename/${filename}/myfile.txt", Acl: "public-read", XAmzServerSideEncryption: "AES256", XAmzMetaUuid: "14365123651274", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
// Key which doesn't start with user/user1/filename
{Bucket: "testbucket", Key: "myfile.txt", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
{Bucket: "testbucket", Key: "myfile.txt", XAmzDate: "20160727T000000Z", Acl: "public-read", XAmzServerSideEncryption: "AES256", XAmzMetaUuid: "14365123651274", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
// Everything is fine with this test
{Bucket: "testbucket", Key: "user/user1/filename/${filename}/myfile.txt", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrNone},
{Bucket: "testbucket", Key: "user/user1/filename/${filename}/myfile.txt", Acl: "public-read", XAmzServerSideEncryption: "AES256", XAmzMetaUuid: "14365123651274", SuccessActionRedirect: "http://127.0.0.1:9000/", XAmzCredential: "KVGKMDUQ23TCZXTLTHLP/20160727/us-east-1/s3/aws4_request", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrNone},
// Incorrect bucket name.
{Bucket: "incorrect", Key: "user/user1/filename/myfile.txt", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
{Bucket: "incorrect", Key: "user/user1/filename/myfile.txt", Acl: "public-read", XAmzServerSideEncryption: "AES256", XAmzMetaUuid: "14365123651274", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
// Incorrect key name
{Bucket: "testbucket", Key: "incorrect", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
{Bucket: "testbucket", Key: "incorrect", Acl: "public-read", XAmzDate: "20160727T000000Z", XAmzServerSideEncryption: "AES256", XAmzMetaUuid: "14365123651274", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "eyAiZXhwaXJhdGlvbiI6ICIyMDE3LTEyLTMwVDEyOjAwOjAwLjAwMFoiLCAiY29uZGl0aW9ucyI6IFsgeyJidWNrZXQiOiAidGVzdGJ1Y2tldCJ9LCBbInN0YXJ0cy13aXRoIiwgIiRrZXkiLCAidXNlci91c2VyMS9maWxlbmFtZSJdLCB7ImFjbCI6ICJwdWJsaWMtcmVhZCJ9LCB7InN1Y2Nlc3NfYWN0aW9uX3JlZGlyZWN0IjogImh0dHA6Ly8xMjcuMC4wLjE6OTAwMC8ifSwgWyJzdGFydHMtd2l0aCIsICIkQ29udGVudC1UeXBlIiwgImltYWdlLyJdLCBbImNvbnRlbnQtbGVuZ3RoLXJhbmdlIiwgMTA0ODU3OSwgMTA0ODU3NjBdLCB7IngtYW16LW1ldGEtdXVpZCI6ICIxNDM2NTEyMzY1MTI3NCJ9LCB7IngtYW16LXNlcnZlci1zaWRlLWVuY3J5cHRpb24iOiAiQUVTMjU2In0sIFsic3RhcnRzLXdpdGgiLCAiJHgtYW16LW1ldGEtdGFnIiwgIiJdLCB7IngtYW16LWNyZWRlbnRpYWwiOiAiS1ZHS01EVVEyM1RDWlhUTFRITFAvMjAxNjA3MjcvdXMtZWFzdC0xL3MzL2F3czRfcmVxdWVzdCJ9LCB7IngtYW16LWFsZ29yaXRobSI6ICJBV1M0LUhNQUMtU0hBMjU2In0sIHsieC1hbXotZGF0ZSI6ICIyMDE2MDcyN1QwMDAwMDBaIiB9IF0gfQ==", ErrCode: ErrAccessDenied},
// Incorrect date
{Bucket: "testbucket", Key: "user/user1/filename/${filename}/myfile.txt", XAmzDate: "incorrect", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
{Bucket: "testbucket", Key: "user/user1/filename/${filename}/myfile.txt", Acl: "public-read", XAmzServerSideEncryption: "AES256", XAmzMetaUuid: "14365123651274", XAmzDate: "incorrect", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "image/jpeg", Policy: "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", ErrCode: ErrAccessDenied},
// Incorrect ContentType
{Bucket: "testbucket", Key: "user/user1/filename/${filename}/myfile.txt", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "incorrect", Policy: "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", ErrCode: ErrAccessDenied},
{Bucket: "testbucket", Key: "user/user1/filename/${filename}/myfile.txt", Acl: "public-read", XAmzServerSideEncryption: "AES256", XAmzMetaUuid: "14365123651274", XAmzDate: "20160727T000000Z", XAmzAlgorithm: "AWS4-HMAC-SHA256", ContentType: "incorrect", Policy: "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", ErrCode: ErrAccessDenied},
}
// Validate all the test cases.
for i, tt := range testCases {
formValues := make(map[string]string)
formValues["Bucket"] = tt.Bucket
formValues["Acl"] = tt.Acl
formValues["Key"] = tt.Key
formValues["X-Amz-Date"] = tt.XAmzDate
formValues["X-Amz-Meta-Uuid"] = tt.XAmzMetaUuid
formValues["X-Amz-Server-Side-Encryption"] = tt.XAmzServerSideEncryption
formValues["X-Amz-Algorithm"] = tt.XAmzAlgorithm
formValues["X-Amz-Credential"] = tt.XAmzCredential
formValues["Content-Type"] = tt.ContentType
formValues["Policy"] = tt.Policy
formValues["Success_action_redirect"] = tt.SuccessActionRedirect
policyBytes, err := base64.StdEncoding.DecodeString(tt.Policy)
if err != nil {
t.Fatal(err)

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