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bucket-policy: Add IPAddress/NotIPAddress conditions support (#4736)

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This commit is contained in:
Aaron Walker 2017-08-05 04:00:05 -04:00 committed by Harshavardhana
parent aeafe668d8
commit 5db533c024
9 changed files with 239 additions and 10 deletions
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3
cmd/auth-handler.go
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@ -126,8 +126,9 @@ func checkRequestAuthType(r *http.Request, bucket, policyAction, region string)
if reqAuthType == authTypeAnonymous && policyAction != "" {
// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
sourceIP := getSourceIPAddress(r)
return enforceBucketPolicy(bucket, policyAction, r.URL.Path,
r.Referer(), r.URL.Query())
r.Referer(), sourceIP, r.URL.Query())
}
// By default return ErrAccessDenied

4
cmd/bucket-handlers.go
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@ -33,7 +33,7 @@ import (
// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
// Enforces bucket policies for a bucket for a given tatusaction.
func enforceBucketPolicy(bucket, action, resource, referer string, queryParams url.Values) (s3Error APIErrorCode) {
func enforceBucketPolicy(bucket, action, resource, referer, sourceIP string, queryParams url.Values) (s3Error APIErrorCode) {
// Verify if bucket actually exists
if err := checkBucketExist(bucket, newObjectLayerFn()); err != nil {
err = errorCause(err)
@ -73,6 +73,8 @@ func enforceBucketPolicy(bucket, action, resource, referer string, queryParams u
if referer != "" {
conditionKeyMap["referer"] = set.CreateStringSet(referer)
}
// Add request source Ip to conditionKeyMap.
conditionKeyMap["ip"] = set.CreateStringSet(sourceIP)
// Validate action, resource and conditions with current policy statements.
if !bucketPolicyEvalStatements(action, arn, conditionKeyMap, policy.Statements) {

47
cmd/bucket-policy-handlers.go
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@ -20,6 +20,7 @@ import (
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"runtime"
"strings"
@ -81,6 +82,18 @@ func refererMatch(pattern, referer string) bool {
return wildcard.MatchSimple(pattern, referer)
}
// isIPInCIDR - checks if a given a IP address is a member of the given subnet.
func isIPInCIDR(cidr, ip string) bool {
// AWS S3 spec says IPs must use standard CIDR notation.
// http://docs.aws.amazon.com/AmazonS3/latest/dev/example-bucket-policies.html#example-bucket-policies-use-case-3.
_, cidrNet, err := net.ParseCIDR(cidr)
if err != nil {
return false // If provided CIDR can't be parsed no IP will be in the subnet.
}
addr := net.ParseIP(ip)
return cidrNet.Contains(addr)
}
// Verify if given resource matches with policy statement.
func bucketPolicyResourceMatch(resource string, statement policyStatement) bool {
// the resource rule for object could contain "*" wild card.
@ -97,11 +110,14 @@ func bucketPolicyConditionMatch(conditions map[string]set.StringSet, statement p
// - StringNotEquals
// - StringLike
// - StringNotLike
// - IpAddress
// - NotIpAddress
//
// Supported applicable condition keys for each conditions.
// - s3:prefix
// - s3:max-keys
// - s3:aws-Referer
// - s3:aws-SourceIp
// The following loop evaluates the logical AND of all the
// conditions in the statement. Note: we can break out of the
@ -159,6 +175,37 @@ func bucketPolicyConditionMatch(conditions map[string]set.StringSet, statement p
return false
}
}
} else if condition == "IpAddress" {
awsIps := conditionKeyVal["aws:SourceIp"]
// Skip empty condition, it is trivially satisfied.
if awsIps.IsEmpty() {
continue
}
// wildcard match of ip if statement was not empty.
// Find a valid ip.
ipFound := false
for ip := range conditions["ip"] {
if !awsIps.FuncMatch(isIPInCIDR, ip).IsEmpty() {
ipFound = true
break
}
}
if !ipFound {
return false
}
} else if condition == "NotIpAddress" {
awsIps := conditionKeyVal["aws:SourceIp"]
// Skip empty condition, it is trivially satisfied.
if awsIps.IsEmpty() {
continue
}
// wildcard match of ip if statement was not empty.
// Find if nothing matches.
for ip := range conditions["ip"] {
if !awsIps.FuncMatch(isIPInCIDR, ip).IsEmpty() {
return false
}
}
}
}

28
cmd/bucket-policy-handlers_test.go
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@ -970,6 +970,34 @@ func TestBucketPolicyConditionMatch(t *testing.T) {
condition: getInnerMap("referer", "http://somethingelse.com/"),
expectedMatch: true,
},
// Test case 13.
// IpAddress condition evaluates to true.
{
statementCondition: getStatementWithCondition("IpAddress", "aws:SourceIp", "54.240.143.0/24"),
condition: getInnerMap("ip", "54.240.143.2"),
expectedMatch: true,
},
// Test case 14.
// IpAddress condition evaluates to false.
{
statementCondition: getStatementWithCondition("IpAddress", "aws:SourceIp", "54.240.143.0/24"),
condition: getInnerMap("ip", "127.240.143.224"),
expectedMatch: false,
},
// Test case 15.
// NotIpAddress condition evaluates to true.
{
statementCondition: getStatementWithCondition("NotIpAddress", "aws:SourceIp", "54.240.143.0/24"),
condition: getInnerMap("ip", "54.240.144.188"),
expectedMatch: true,
},
// Test case 16.
// NotIpAddress condition evaluates to false.
{
statementCondition: getStatementWithCondition("NotIpAddress", "aws:SourceIp", "54.240.143.0/24"),
condition: getInnerMap("ip", "54.240.143.243"),
expectedMatch: false,
},
}
for i, tc := range testCases {

4
cmd/bucket-policy-parser.go
View File

@ -40,11 +40,11 @@ var supportedActionMap = set.CreateStringSet("*", "s3:*", "s3:GetObject",
"s3:AbortMultipartUpload", "s3:ListBucketMultipartUploads", "s3:ListMultipartUploadParts")
// supported Conditions type.
var supportedConditionsType = set.CreateStringSet("StringEquals", "StringNotEquals", "StringLike", "StringNotLike")
var supportedConditionsType = set.CreateStringSet("StringEquals", "StringNotEquals", "StringLike", "StringNotLike", "IpAddress", "NotIpAddress")
// Validate s3:prefix, s3:max-keys are present if not
// supported keys for the conditions.
var supportedConditionsKey = set.CreateStringSet("s3:prefix", "s3:max-keys", "aws:Referer")
var supportedConditionsKey = set.CreateStringSet("s3:prefix", "s3:max-keys", "aws:Referer", "aws:SourceIp")
// supportedEffectMap - supported effects.
var supportedEffectMap = set.CreateStringSet("Allow", "Deny")

78
cmd/bucket-policy-parser_test.go
View File

@ -374,6 +374,12 @@ func TestIsValidConditions(t *testing.T) {
// returns map with the "StringNotLike" set to empty map.
setEmptyStringNotLike := getEmptyConditionKeyMap("StringNotLike")
// returns map with the "IpAddress" set to empty map.
setEmptyIPAddress := getEmptyConditionKeyMap("IpAddress")
// returns map with "NotIpAddress" set to empty map.
setEmptyNotIPAddress := getEmptyConditionKeyMap("NotIpAddress")
// Generate conditions.
generateConditions := func(key1, key2, value string) map[string]map[string]set.StringSet {
innerMap := make(map[string]set.StringSet)
@ -427,6 +433,8 @@ func TestIsValidConditions(t *testing.T) {
setEmptyStringNotEquals(),
setEmptyStringLike(),
setEmptyStringNotLike(),
setEmptyIPAddress(),
setEmptyNotIPAddress(),
generateConditions("StringEquals", "s3:prefix", "Asia/"),
generateConditions("StringEquals", "s3:max-keys", "100"),
generateConditions("StringNotEquals", "s3:prefix", "Asia/"),
@ -482,7 +490,13 @@ func TestIsValidConditions(t *testing.T) {
// Test case - 12.
{roBucketActionSet, testConditions[11], nil, true},
// Test case - 13.
{getObjectActionSet, testConditions[11], maxKeysConditionErr, false},
{roBucketActionSet, testConditions[12], nil, true},
// Test case - 11.
{roBucketActionSet, testConditions[13], nil, true},
// Test case - 12.
{roBucketActionSet, testConditions[14], nil, true},
// Test case - 13.
{getObjectActionSet, testConditions[15], maxKeysConditionErr, false},
}
for i, testCase := range testCases {
actualErr := isValidConditions(testCase.inputActions, testCase.inputCondition)
@ -787,3 +801,65 @@ func TestAWSRefererCondition(t *testing.T) {
}
}
}
func TestAWSSourceIPCondition(t *testing.T) {
resource := set.CreateStringSet([]string{
fmt.Sprintf("%s%s", bucketARNPrefix, "minio-bucket"+"/"+"Asia"+"*"),
}...)
conditionsKeyMap := make(policy.ConditionKeyMap)
// Test both IPv4 and IPv6 addresses.
conditionsKeyMap.Add("aws:SourceIp",
set.CreateStringSet("54.240.143.0/24",
"2001:DB8:1234:5678::/64"))
requestConditionKeyMap := make(map[string]set.StringSet)
requestConditionKeyMap["ip"] = set.CreateStringSet("54.240.143.2")
testCases := []struct {
effect string
conditionKey string
match bool
}{
{
effect: "Allow",
conditionKey: "IpAddress",
match: true,
},
{
effect: "Allow",
conditionKey: "NotIpAddress",
match: false,
},
{
effect: "Deny",
conditionKey: "IpAddress",
match: true,
},
{
effect: "Deny",
conditionKey: "NotIpAddress",
match: false,
},
}
for i, test := range testCases {
conditions := make(map[string]map[string]set.StringSet)
conditions[test.conditionKey] = conditionsKeyMap
allowStatement := policyStatement{
Sid: "Testing AWS referer condition",
Effect: test.effect,
Principal: map[string]interface{}{
"AWS": "*",
},
Resources: resource,
Conditions: conditions,
}
if result := bucketPolicyConditionMatch(requestConditionKeyMap, allowStatement); result != test.match {
t.Errorf("Test %d - Expected conditons to evaluate to %v but got %v",
i+1, test.match, result)
}
}
}

27
cmd/object-handlers.go
View File

@ -48,16 +48,33 @@ func setGetRespHeaders(w http.ResponseWriter, reqParams url.Values) {
}
}
// getSourceIPAddress - get the source ip address of the request.
func getSourceIPAddress(r *http.Request) string {
var ip string
// Attempt to get ip from standard headers.
// Do not support X-Forwarded-For because it is easy to spoof.
ip = r.Header.Get("X-Real-Ip")
parsedIP := net.ParseIP(ip)
// Skip non valid IP address.
if parsedIP != nil {
return ip
}
// Default to remote address if headers not set.
ip, _, _ = net.SplitHostPort(r.RemoteAddr)
return ip
}
// errAllowableNotFound - For an anon user, return 404 if have ListBucket, 403 otherwise
// this is in keeping with the permissions sections of the docs of both:
// HEAD Object: http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectHEAD.html
// GET Object: http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectGET.html
func errAllowableObjectNotFound(bucket string, r *http.Request) APIErrorCode {
if getRequestAuthType(r) == authTypeAnonymous {
//we care about the bucket as a whole, not a particular resource
// We care about the bucket as a whole, not a particular resource.
resource := "/" + bucket
sourceIP := getSourceIPAddress(r)
if s3Error := enforceBucketPolicy(bucket, "s3:ListBucket", resource,
r.Referer(), r.URL.Query()); s3Error != ErrNone {
r.Referer(), sourceIP, r.URL.Query()); s3Error != ErrNone {
return ErrAccessDenied
}
}
@ -505,8 +522,9 @@ func (api objectAPIHandlers) PutObjectHandler(w http.ResponseWriter, r *http.Req
return
case authTypeAnonymous:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/using-with-s3-actions.html
sourceIP := getSourceIPAddress(r)
if s3Error := enforceBucketPolicy(bucket, "s3:PutObject", r.URL.Path,
r.Referer(), r.URL.Query()); s3Error != ErrNone {
r.Referer(), sourceIP, r.URL.Query()); s3Error != ErrNone {
writeErrorResponse(w, s3Error, r.URL)
return
}
@ -791,8 +809,9 @@ func (api objectAPIHandlers) PutObjectPartHandler(w http.ResponseWriter, r *http
return
case authTypeAnonymous:
// http://docs.aws.amazon.com/AmazonS3/latest/dev/mpuAndPermissions.html
sourceIP := getSourceIPAddress(r)
if s3Error := enforceBucketPolicy(bucket, "s3:PutObject", r.URL.Path,
r.Referer(), r.URL.Query()); s3Error != ErrNone {
r.Referer(), sourceIP, r.URL.Query()); s3Error != ErrNone {
writeErrorResponse(w, s3Error, r.URL)
return
}

53
cmd/object-handlers_test.go
View File

@ -3552,3 +3552,56 @@ func testAPIListObjectPartsHandler(obj ObjectLayer, instanceType, bucketName str
// `ExecObjectLayerAPINilTest` sets the Object Layer to `nil` and calls the handler.
ExecObjectLayerAPINilTest(t, nilBucket, nilObject, instanceType, apiRouter, nilReq)
}
// TestGetSourceIPAddress - check the source ip of a request is parsed correctly.
func TestGetSourceIPAddress(t *testing.T) {
testCases := []struct {
request *http.Request
expectedIP string
}{
{
// Test Case 1. Use only RemoteAddr as host and port.
request: &http.Request{
RemoteAddr: "127.0.0.1:9000",
},
expectedIP: "127.0.0.1",
},
{
// Test Case 2. Use both RemoteAddr and single header.
request: &http.Request{
RemoteAddr: "127.0.0.1:9000",
Header: map[string][]string{
"X-Real-Ip": {"54.240.143.0"},
},
},
expectedIP: "54.240.143.0", // Use headers before RemoteAddr.
},
{
// Test Case 3. Use both RemoteAddr and several header vals.
// Check that first val in header is used.
request: &http.Request{
RemoteAddr: "127.0.0.1:9000",
Header: map[string][]string{
"X-Real-Ip": {"54.240.143.0", "54.240.143.188"},
},
},
expectedIP: "54.240.143.0",
},
{
// Test Case 4. Use header and corrupt header value.
request: &http.Request{
RemoteAddr: "127.0.0.1:9000",
Header: map[string][]string{
"X-Real-Ip": {"54.240.143.188", "corrupt"},
},
},
expectedIP: "54.240.143.188",
},
}
for i, test := range testCases {
receivedIP := getSourceIPAddress(test.request)
if test.expectedIP != receivedIP {
t.Fatalf("Case %d: Expected the IP to be `%s`, but instead got `%s`", i+1, test.expectedIP, receivedIP)
}
}
}

3
docs/bucket/policy/README.md
View File

@ -24,12 +24,15 @@ This package implements parsing and validating bucket access policies based on A
StringNotEquals
StringLike
StringNotLike
IpAddress
NotIpAddress
Supported applicable condition keys for each conditions.
s3:prefix
s3:max-keys
aws:Referer
aws:SourceIp
### Nested policy support.