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Add check for extra input field (#7437)

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fixes #6559
This commit is contained in:
Ashish Kumar Sinha 2019-04-02 12:15:32 +05:30 committed by Nitish Tiwari
parent 023866642c
commit a4bdcba503
2 changed files with 25 additions and 5 deletions
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14
cmd/post-policy_test.go
View File

@ -53,10 +53,12 @@ func newPostPolicyBytesV4WithContentRange(credential, bucketName, objectKey stri
dateConditionStr := fmt.Sprintf(`["eq", "$x-amz-date", "%s"]`, t.Format(iso8601DateFormat))
// Add the credential string, only accept the credential passed.
credentialConditionStr := fmt.Sprintf(`["eq", "$x-amz-credential", "%s"]`, credential)
// Add the meta-uuid string, set to 1234
uuidConditionStr := fmt.Sprintf(`["eq", "$x-amz-meta-uuid", "%s"]`, "1234")
// Combine all conditions into one string.
conditionStr := fmt.Sprintf(`"conditions":[%s, %s, %s, %s, %s, %s]`, bucketConditionStr,
keyConditionStr, contentLengthCondStr, algorithmConditionStr, dateConditionStr, credentialConditionStr)
conditionStr := fmt.Sprintf(`"conditions":[%s, %s, %s, %s, %s, %s, %s]`, bucketConditionStr,
keyConditionStr, contentLengthCondStr, algorithmConditionStr, dateConditionStr, credentialConditionStr, uuidConditionStr)
retStr := "{"
retStr = retStr + expirationStr + ","
retStr = retStr + conditionStr
@ -80,9 +82,11 @@ func newPostPolicyBytesV4(credential, bucketName, objectKey string, expiration t
dateConditionStr := fmt.Sprintf(`["eq", "$x-amz-date", "%s"]`, t.Format(iso8601DateFormat))
// Add the credential string, only accept the credential passed.
credentialConditionStr := fmt.Sprintf(`["eq", "$x-amz-credential", "%s"]`, credential)
// Add the meta-uuid string, set to 1234
uuidConditionStr := fmt.Sprintf(`["eq", "$x-amz-meta-uuid", "%s"]`, "1234")
// Combine all conditions into one string.
conditionStr := fmt.Sprintf(`"conditions":[%s, %s, %s, %s, %s]`, bucketConditionStr, keyConditionStr, algorithmConditionStr, dateConditionStr, credentialConditionStr)
conditionStr := fmt.Sprintf(`"conditions":[%s, %s, %s, %s, %s, %s]`, bucketConditionStr, keyConditionStr, algorithmConditionStr, dateConditionStr, credentialConditionStr, uuidConditionStr)
retStr := "{"
retStr = retStr + expirationStr + ","
retStr = retStr + conditionStr
@ -261,7 +265,7 @@ func testPostPolicyBucketHandler(obj ObjectLayer, instanceType string, t TestErr
accessKey: credentials.AccessKey,
secretKey: credentials.SecretKey,
dates: []interface{}{curTimePlus5Min.Format(expirationDateFormat), curTime.Format(iso8601DateFormat), curTime.Format(yyyymmdd)},
policy: `{"expiration": "%s","conditions":[["eq", "$bucket", "` + bucketName + `"], ["starts-with", "$key", "test/"], ["eq", "$x-amz-algorithm", "AWS4-HMAC-SHA256"], ["eq", "$x-amz-date", "%s"], ["eq", "$x-amz-credential", "` + credentials.AccessKey + `/%s/us-east-1/s3/aws4_request"]]}`,
policy: `{"expiration": "%s","conditions":[["eq", "$bucket", "` + bucketName + `"], ["starts-with", "$key", "test/"], ["eq", "$x-amz-algorithm", "AWS4-HMAC-SHA256"], ["eq", "$x-amz-date", "%s"], ["eq", "$x-amz-credential", "` + credentials.AccessKey + `/%s/us-east-1/s3/aws4_request"],["eq", "$x-amz-meta-uuid", "1234"]]}`,
},
// Corrupted Base 64 result
{
@ -457,7 +461,7 @@ func testPostPolicyBucketHandlerRedirect(obj ObjectLayer, instanceType string, t
rec := httptest.NewRecorder()
dates := []interface{}{curTimePlus5Min.Format(expirationDateFormat), curTime.Format(iso8601DateFormat), curTime.Format(yyyymmdd)}
policy := `{"expiration": "%s","conditions":[["eq", "$bucket", "` + bucketName + `"], {"success_action_redirect":"` + redirectURL.String() + `"},["starts-with", "$key", "test/"], ["eq", "$x-amz-algorithm", "AWS4-HMAC-SHA256"], ["eq", "$x-amz-date", "%s"], ["eq", "$x-amz-credential", "` + credentials.AccessKey + `/%s/us-east-1/s3/aws4_request"]]}`
policy := `{"expiration": "%s","conditions":[["eq", "$bucket", "` + bucketName + `"], {"success_action_redirect":"` + redirectURL.String() + `"},["starts-with", "$key", "test/"], ["eq", "$x-amz-meta-uuid", "1234"], ["eq", "$x-amz-algorithm", "AWS4-HMAC-SHA256"], ["eq", "$x-amz-date", "%s"], ["eq", "$x-amz-credential", "` + credentials.AccessKey + `/%s/us-east-1/s3/aws4_request"]]}`
// Generate the final policy document
policy = fmt.Sprintf(policy, dates...)

16
cmd/postpolicyform.go
View File

@ -222,6 +222,22 @@ func checkPostPolicy(formValues http.Header, postPolicyForm PostPolicyForm) erro
if !postPolicyForm.Expiration.After(UTCNow()) {
return fmt.Errorf("Invalid according to Policy: Policy expired")
}
// map to store the metadata
metaMap := make(map[string]string)
for cond, v := range postPolicyForm.Conditions.Policies {
if strings.HasPrefix(cond, "$x-amz-meta-") {
formCanonicalName := http.CanonicalHeaderKey(strings.TrimPrefix(cond, "$"))
metaMap[formCanonicalName] = v.Value
}
}
// Check if any extra metadata field is passed as input
for key := range formValues {
if strings.HasPrefix(key, "X-Amz-Meta-") {
if _, ok := metaMap[key]; !ok {
return fmt.Errorf("Invalid according to Policy: Extra input fields: %s", key)
}
}
}
// Flag to indicate if all policies conditions are satisfied
condPassed := true