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Swift: Add barriers for encryption.

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This commit is contained in:
Geoffrey White
2022-09-06 09:09:28 +01:00
parent 9683a95162
commit 8281d92e71
7 changed files with 22 additions and 40 deletions
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13
swift/ql/lib/codeql/swift/security/SensitiveExprs.qll
View File

@@ -154,3 +154,16 @@ class SensitiveExpr extends Expr {
*/
predicate isProbablySafe() { label.toLowerCase().regexpMatch(regexpProbablySafe()) }
}
/**
* An expression that may be protected with encryption, for example an
* argument to a function called "encrypt".
*/
class EncryptedExpr extends Expr {
EncryptedExpr() {
exists(CallExpr call |
call.getStaticTarget().getName().regexpMatch(".*(crypt|hash|encode|protect).*") and
call.getAnArgument().getExpr() = this
)
}
}

3
swift/ql/src/queries/Security/CWE-311/CleartextStorageDatabase.ql
View File

@@ -82,6 +82,9 @@ class CleartextStorageConfig extends TaintTracking::Configuration {
override predicate isSanitizerIn(DataFlow::Node node) {
// make sources barriers so that we only report the closest instance
isSource(node)
or
// encryption barrier
node.asExpr() instanceof EncryptedExpr
}
override predicate allowImplicitRead(DataFlow::Node node, DataFlow::ContentSet c) {

3
swift/ql/src/queries/Security/CWE-311/CleartextTransmission.ql
View File

@@ -75,6 +75,9 @@ class CleartextTransmissionConfig extends TaintTracking::Configuration {
override predicate isSanitizerIn(DataFlow::Node node) {
// make sources barriers so that we only report the closest instance
isSource(node)
or
// encryption barrier
node.asExpr() instanceof EncryptedExpr
}
}

25
swift/ql/test/query-tests/Security/CWE-311/CleartextStorageDatabase.expected
View File

@@ -2,24 +2,13 @@ edges
| file://:0:0:0:0 | value : | file://:0:0:0:0 | [post] self [data] : |
| testCoreData.swift:18:19:18:26 | value : | testCoreData.swift:19:12:19:12 | value |
| testCoreData.swift:31:3:31:3 | newValue : | testCoreData.swift:32:13:32:13 | newValue |
| testCoreData.swift:37:14:37:22 | data : | testCoreData.swift:37:49:37:49 | data : |
| testCoreData.swift:38:11:38:23 | data : | testCoreData.swift:38:1:38:33 | data[return] : |
| testCoreData.swift:61:25:61:25 | password : | testCoreData.swift:18:19:18:26 | value : |
| testCoreData.swift:64:16:64:16 | password : | testCoreData.swift:31:3:31:3 | newValue : |
| testCoreData.swift:77:24:77:24 | x : | testCoreData.swift:78:15:78:15 | x |
| testCoreData.swift:80:10:80:22 | call to getPassword() : | testCoreData.swift:81:15:81:15 | y |
| testCoreData.swift:91:10:91:10 | passwd : | testCoreData.swift:95:15:95:15 | x |
| testCoreData.swift:91:10:91:10 | passwd : | testCoreData.swift:99:14:99:14 | x : |
| testCoreData.swift:92:10:92:10 | passwd : | testCoreData.swift:96:15:96:15 | y |
| testCoreData.swift:92:10:92:10 | passwd : | testCoreData.swift:100:13:100:14 | &... : |
| testCoreData.swift:92:10:92:10 | passwd : | testCoreData.swift:104:15:104:15 | y |
| testCoreData.swift:93:10:93:10 | passwd : | testCoreData.swift:97:15:97:15 | z |
| testCoreData.swift:99:6:99:15 | call to encrypt(_:) : | testCoreData.swift:103:15:103:15 | x |
| testCoreData.swift:99:14:99:14 | x : | testCoreData.swift:37:14:37:22 | data : |
| testCoreData.swift:99:14:99:14 | x : | testCoreData.swift:99:6:99:15 | call to encrypt(_:) : |
| testCoreData.swift:100:13:100:14 | &... : | testCoreData.swift:38:11:38:23 | data : |
| testCoreData.swift:100:13:100:14 | &... : | testCoreData.swift:100:13:100:14 | [post] &... : |
| testCoreData.swift:100:13:100:14 | [post] &... : | testCoreData.swift:104:15:104:15 | y |
| testRealm.swift:16:6:16:6 | value : | file://:0:0:0:0 | value : |
| testRealm.swift:34:2:34:2 | [post] a [data] : | testRealm.swift:35:12:35:12 | a |
| testRealm.swift:34:11:34:11 | myPassword : | testRealm.swift:16:6:16:6 | value : |
@@ -34,10 +23,6 @@ nodes
| testCoreData.swift:19:12:19:12 | value | semmle.label | value |
| testCoreData.swift:31:3:31:3 | newValue : | semmle.label | newValue : |
| testCoreData.swift:32:13:32:13 | newValue | semmle.label | newValue |
| testCoreData.swift:37:14:37:22 | data : | semmle.label | data : |
| testCoreData.swift:37:49:37:49 | data : | semmle.label | data : |
| testCoreData.swift:38:1:38:33 | data[return] : | semmle.label | data[return] : |
| testCoreData.swift:38:11:38:23 | data : | semmle.label | data : |
| testCoreData.swift:48:15:48:15 | password | semmle.label | password |
| testCoreData.swift:51:24:51:24 | password | semmle.label | password |
| testCoreData.swift:58:15:58:15 | password | semmle.label | password |
@@ -54,12 +39,6 @@ nodes
| testCoreData.swift:95:15:95:15 | x | semmle.label | x |
| testCoreData.swift:96:15:96:15 | y | semmle.label | y |
| testCoreData.swift:97:15:97:15 | z | semmle.label | z |
| testCoreData.swift:99:6:99:15 | call to encrypt(_:) : | semmle.label | call to encrypt(_:) : |
| testCoreData.swift:99:14:99:14 | x : | semmle.label | x : |
| testCoreData.swift:100:13:100:14 | &... : | semmle.label | &... : |
| testCoreData.swift:100:13:100:14 | [post] &... : | semmle.label | [post] &... : |
| testCoreData.swift:103:15:103:15 | x | semmle.label | x |
| testCoreData.swift:104:15:104:15 | y | semmle.label | y |
| testRealm.swift:16:6:16:6 | value : | semmle.label | value : |
| testRealm.swift:34:2:34:2 | [post] a [data] : | semmle.label | [post] a [data] : |
| testRealm.swift:34:11:34:11 | myPassword : | semmle.label | myPassword : |
@@ -68,8 +47,6 @@ nodes
| testRealm.swift:42:11:42:11 | myPassword : | semmle.label | myPassword : |
| testRealm.swift:43:47:43:47 | c | semmle.label | c |
subpaths
| testCoreData.swift:99:14:99:14 | x : | testCoreData.swift:37:14:37:22 | data : | testCoreData.swift:37:49:37:49 | data : | testCoreData.swift:99:6:99:15 | call to encrypt(_:) : |
| testCoreData.swift:100:13:100:14 | &... : | testCoreData.swift:38:11:38:23 | data : | testCoreData.swift:38:1:38:33 | data[return] : | testCoreData.swift:100:13:100:14 | [post] &... : |
| testRealm.swift:34:11:34:11 | myPassword : | testRealm.swift:16:6:16:6 | value : | file://:0:0:0:0 | [post] self [data] : | testRealm.swift:34:2:34:2 | [post] a [data] : |
| testRealm.swift:42:11:42:11 | myPassword : | testRealm.swift:16:6:16:6 | value : | file://:0:0:0:0 | [post] self [data] : | testRealm.swift:42:2:42:2 | [post] c [data] : |
#select
@@ -84,7 +61,5 @@ subpaths
| testCoreData.swift:95:15:95:15 | x | testCoreData.swift:91:10:91:10 | passwd : | testCoreData.swift:95:15:95:15 | x | This operation stores 'x' in a database. It may contain unencrypted sensitive data from $@ | testCoreData.swift:91:10:91:10 | passwd : | passwd |
| testCoreData.swift:96:15:96:15 | y | testCoreData.swift:92:10:92:10 | passwd : | testCoreData.swift:96:15:96:15 | y | This operation stores 'y' in a database. It may contain unencrypted sensitive data from $@ | testCoreData.swift:92:10:92:10 | passwd : | passwd |
| testCoreData.swift:97:15:97:15 | z | testCoreData.swift:93:10:93:10 | passwd : | testCoreData.swift:97:15:97:15 | z | This operation stores 'z' in a database. It may contain unencrypted sensitive data from $@ | testCoreData.swift:93:10:93:10 | passwd : | passwd |
| testCoreData.swift:103:15:103:15 | x | testCoreData.swift:91:10:91:10 | passwd : | testCoreData.swift:103:15:103:15 | x | This operation stores 'x' in a database. It may contain unencrypted sensitive data from $@ | testCoreData.swift:91:10:91:10 | passwd : | passwd |
| testCoreData.swift:104:15:104:15 | y | testCoreData.swift:92:10:92:10 | passwd : | testCoreData.swift:104:15:104:15 | y | This operation stores 'y' in a database. It may contain unencrypted sensitive data from $@ | testCoreData.swift:92:10:92:10 | passwd : | passwd |
| testRealm.swift:35:12:35:12 | a | testRealm.swift:34:11:34:11 | myPassword : | testRealm.swift:35:12:35:12 | a | This operation stores 'a' in a database. It may contain unencrypted sensitive data from $@ | testRealm.swift:34:11:34:11 | myPassword : | myPassword |
| testRealm.swift:43:47:43:47 | c | testRealm.swift:42:11:42:11 | myPassword : | testRealm.swift:43:47:43:47 | c | This operation stores 'c' in a database. It may contain unencrypted sensitive data from $@ | testRealm.swift:42:11:42:11 | myPassword : | myPassword |

12
swift/ql/test/query-tests/Security/CWE-311/CleartextTransmission.expected
View File

@@ -14,11 +14,6 @@ edges
| testSend.swift:49:17:49:35 | call to aes_crypt(_:) : | testSend.swift:49:13:49:36 | call to pad(_:) : |
| testSend.swift:49:27:49:27 | password : | testSend.swift:42:16:42:24 | data : |
| testSend.swift:49:27:49:27 | password : | testSend.swift:49:17:49:35 | call to aes_crypt(_:) : |
| testSend.swift:50:13:50:36 | call to aes_crypt(_:) : | testSend.swift:57:27:57:27 | str6 |
| testSend.swift:50:23:50:35 | call to pad(_:) : | testSend.swift:42:16:42:24 | data : |
| testSend.swift:50:23:50:35 | call to pad(_:) : | testSend.swift:50:13:50:36 | call to aes_crypt(_:) : |
| testSend.swift:50:27:50:27 | password : | testSend.swift:41:10:41:18 | data : |
| testSend.swift:50:27:50:27 | password : | testSend.swift:50:23:50:35 | call to pad(_:) : |
| testURL.swift:13:54:13:54 | passwd : | testURL.swift:13:22:13:54 | ... .+(_:_:) ... |
| testURL.swift:16:55:16:55 | credit_card_no : | testURL.swift:16:22:16:55 | ... .+(_:_:) ... |
nodes
@@ -36,15 +31,11 @@ nodes
| testSend.swift:49:13:49:36 | call to pad(_:) : | semmle.label | call to pad(_:) : |
| testSend.swift:49:17:49:35 | call to aes_crypt(_:) : | semmle.label | call to aes_crypt(_:) : |
| testSend.swift:49:27:49:27 | password : | semmle.label | password : |
| testSend.swift:50:13:50:36 | call to aes_crypt(_:) : | semmle.label | call to aes_crypt(_:) : |
| testSend.swift:50:23:50:35 | call to pad(_:) : | semmle.label | call to pad(_:) : |
| testSend.swift:50:27:50:27 | password : | semmle.label | password : |
| testSend.swift:52:27:52:27 | str1 | semmle.label | str1 |
| testSend.swift:53:27:53:27 | str2 | semmle.label | str2 |
| testSend.swift:54:27:54:27 | str3 | semmle.label | str3 |
| testSend.swift:55:27:55:27 | str4 | semmle.label | str4 |
| testSend.swift:56:27:56:27 | str5 | semmle.label | str5 |
| testSend.swift:57:27:57:27 | str6 | semmle.label | str6 |
| testURL.swift:13:22:13:54 | ... .+(_:_:) ... | semmle.label | ... .+(_:_:) ... |
| testURL.swift:13:54:13:54 | passwd : | semmle.label | passwd : |
| testURL.swift:16:22:16:55 | ... .+(_:_:) ... | semmle.label | ... .+(_:_:) ... |
@@ -55,8 +46,6 @@ subpaths
| testSend.swift:48:23:48:23 | password : | testSend.swift:42:16:42:24 | data : | testSend.swift:42:51:42:51 | data : | testSend.swift:48:13:48:31 | call to aes_crypt(_:) : |
| testSend.swift:49:17:49:35 | call to aes_crypt(_:) : | testSend.swift:41:10:41:18 | data : | testSend.swift:41:45:41:45 | data : | testSend.swift:49:13:49:36 | call to pad(_:) : |
| testSend.swift:49:27:49:27 | password : | testSend.swift:42:16:42:24 | data : | testSend.swift:42:51:42:51 | data : | testSend.swift:49:17:49:35 | call to aes_crypt(_:) : |
| testSend.swift:50:23:50:35 | call to pad(_:) : | testSend.swift:42:16:42:24 | data : | testSend.swift:42:51:42:51 | data : | testSend.swift:50:13:50:36 | call to aes_crypt(_:) : |
| testSend.swift:50:27:50:27 | password : | testSend.swift:41:10:41:18 | data : | testSend.swift:41:45:41:45 | data : | testSend.swift:50:23:50:35 | call to pad(_:) : |
#select
| testSend.swift:29:19:29:19 | passwordPlain | testSend.swift:29:19:29:19 | passwordPlain | testSend.swift:29:19:29:19 | passwordPlain | This operation transmits 'passwordPlain', which may contain unencrypted sensitive data from $@ | testSend.swift:29:19:29:19 | passwordPlain | passwordPlain |
| testSend.swift:52:27:52:27 | str1 | testSend.swift:45:13:45:13 | password : | testSend.swift:52:27:52:27 | str1 | This operation transmits 'str1', which may contain unencrypted sensitive data from $@ | testSend.swift:45:13:45:13 | password : | password |
@@ -64,7 +53,6 @@ subpaths
| testSend.swift:54:27:54:27 | str3 | testSend.swift:47:17:47:17 | password : | testSend.swift:54:27:54:27 | str3 | This operation transmits 'str3', which may contain unencrypted sensitive data from $@ | testSend.swift:47:17:47:17 | password : | password |
| testSend.swift:55:27:55:27 | str4 | testSend.swift:48:23:48:23 | password : | testSend.swift:55:27:55:27 | str4 | This operation transmits 'str4', which may contain unencrypted sensitive data from $@ | testSend.swift:48:23:48:23 | password : | password |
| testSend.swift:56:27:56:27 | str5 | testSend.swift:49:27:49:27 | password : | testSend.swift:56:27:56:27 | str5 | This operation transmits 'str5', which may contain unencrypted sensitive data from $@ | testSend.swift:49:27:49:27 | password : | password |
| testSend.swift:57:27:57:27 | str6 | testSend.swift:50:27:50:27 | password : | testSend.swift:57:27:57:27 | str6 | This operation transmits 'str6', which may contain unencrypted sensitive data from $@ | testSend.swift:50:27:50:27 | password : | password |
| testURL.swift:13:22:13:54 | ... .+(_:_:) ... | testURL.swift:13:54:13:54 | passwd : | testURL.swift:13:22:13:54 | ... .+(_:_:) ... | This operation transmits '... .+(_:_:) ...', which may contain unencrypted sensitive data from $@ | testURL.swift:13:54:13:54 | passwd : | passwd |
| testURL.swift:16:22:16:55 | ... .+(_:_:) ... | testURL.swift:16:55:16:55 | credit_card_no : | testURL.swift:16:22:16:55 | ... .+(_:_:) ... | This operation transmits '... .+(_:_:) ...', which may contain unencrypted sensitive data from $@ | testURL.swift:16:55:16:55 | credit_card_no : | credit_card_no |
| testURL.swift:20:22:20:22 | passwd | testURL.swift:20:22:20:22 | passwd | testURL.swift:20:22:20:22 | passwd | This operation transmits 'passwd', which may contain unencrypted sensitive data from $@ | testURL.swift:20:22:20:22 | passwd | passwd |

4
swift/ql/test/query-tests/Security/CWE-311/testCoreData.swift
View File

@@ -100,7 +100,7 @@ func test4(obj : NSManagedObject, passwd : String) {
hash(data: &y);
z = "";
obj.setValue(x, forKey: "myKey") // GOOD (not sensitive) [FALSE POSITIVE]
obj.setValue(y, forKey: "myKey") // GOOD (not sensitive) [FALSE POSITIVE]
obj.setValue(x, forKey: "myKey") // GOOD (not sensitive)
obj.setValue(y, forKey: "myKey") // GOOD (not sensitive)
obj.setValue(z, forKey: "myKey") // GOOD (not sensitive)
}

2
swift/ql/test/query-tests/Security/CWE-311/testSend.swift
View File

@@ -54,5 +54,5 @@ func test2(password : String, connection : NWConnection) {
connection.send(content: str3, completion: .idempotent) // BAD
connection.send(content: str4, completion: .idempotent) // GOOD (encrypted) [FALSE POSITIVE]
connection.send(content: str5, completion: .idempotent) // GOOD (encrypted) [FALSE POSITIVE]
connection.send(content: str6, completion: .idempotent) // GOOD (encrypted) [FALSE POSITIVE]
connection.send(content: str6, completion: .idempotent) // GOOD (encrypted)
}