/usr/lib/libMobileGestalt.dylib is a private library which provides an API to retrieve the capabilities of the iOS device, as well as some runtime information: system version, build version, device type, current status of the airplane mode, …

The implementation is similar to a key-value database. The library exposes a simple function to retrieve the value for a specified key:

id MGCopyAnswer(NSString *inKey);

When calling this method with a key, it returns the associated value stored in the database, or nil if the key does not exist.

MGCopyAnswer examples

The UIKit framework uses the libMobileGestalt.dylib in several methods. Let's look at 4 examples.

-[UIDevice systemVersion]

The implementation of -[UIDevice systemVersion] looks like the following (note that I simplified the code for clarity). As you can see -[UIDevice systemVersion] simply returns the value for the key ProductVersion :

-(NSString *)systemVersion { NSString *systemVersion = MGCopyAnswer(@"ProductVersion"); if (systemVersion != nil) { return systemVersion; } return @"Unknown"; }

-[UIDevice buildVersion]

Similarly the private -[UIDevice buildVersion] method just returns the value corresponding to the key BuildVersion :

-(NSString *)buildVersion { NSString *buildVersion = MGCopyAnswer(@"BuildVersion"); if (buildVersion != nil) { return buildVersion; } return @"Unknown"; }

-[UIScreen _pointsPerInch]

Another interesting method is -[UIScreen _pointsPerInch] which uses the value corresponding to the key main-screen-pitch .

-[UIDevice systemName]

A last example is -[UIDevice systemName] (also simplified):

-(NSString *)systemName { NSString *systemName = MGCopyAnswer(@"j9Th5smJpdztHwc+i39zIg"); if (systemName != nil) { return systemName; } systemName = MGCopyAnswer(@"ProductName"); if (systemName != nil) { return systemName; } return @"Unknown"; }

Note the string j9Th5smJpdztHwc+i39zIg used by -[UIDevice systemName] which I will refer as “obfuscated key”.

MGCopyAnswer implementation

Let's look at how MGCopyAnswer is implemented:

It first checks if the string passed as parameter exists as key in the database. If this is the case the value associated to the key is returned.

Otherwise it calculates the obfuscated key from the key and checks if the obfuscated key exists in the database. In this case the value associated to the obfuscated key is returned.

Obfuscated keys

The code to calculate the obfuscated key is quite simple. Below is the annotated function:

As you can see the implementation does the following:

add a “MGCopyAnswer” prefix to the string

calculate the MD5

use the CommonCrypto CNEncode function to calculate the base64 value

An equivalent Objective-C implementation is:

NSString *CalculateObfuscatedKey(const char *inString) { // Add a prefix char buffer[256] = { 0 }; snprintf(buffer, sizeof(buffer), "%s%s", "MGCopyAnswer", inString); // Calculate MD5 unsigned char md5Hash[CC_MD5_DIGEST_LENGTH] = { 0 }; CC_MD5(buffer, (CC_LONG)strlen(buffer), md5Hash); // Base64 NSData *md5Data = [NSData dataWithBytes:md5Hash length:CC_MD5_DIGEST_LENGTH]; NSString *obfuscatedKey = [md5Data base64EncodedStringWithOptions:0]; // Base64 converts 3 bytes into 4 encoded characters. // The MD5 contains 16 bytes. 16 bytes not being a multiple of 3, the Base64 is padded with "==" // and we end up with (16+2) * 4 / 3 = 24 encoded characters // The last 2 characters are useless and they are dropped // (i.e. only keep the first 22 characters). return [obfuscatedKey substringToIndex:22]; }

Getting the list of all valid obfuscated keys

Is it possible to get the list of all valid keys? Not easy…

However getting the list of obfuscated keys is simple because it is stored inside the libMobileGestalt.dylib binary. You can get the list of the 646 obfuscated keys here: obfuscatedkeys.txt

/2V8H9h/+z0UxNUr9aRLeQ /6FWCRjN1yRdUABG9vF8ow /9luHerXthRoPoNt/PVkTg /bSMNaIuUT58N/BN1nYUjw /cMWdoU/88pcjJ1egxmIYw /ej/HWmqnKV/QQptXhUZmg […] zJUWenIp94snlzBD1cub3g znvmheFkjr6hiqIK9TrCVw zP3kBA1Biwz2d6PTIIbmUQ zPSNnYDFk+x5ebOtenb3Eg zxMIgVSILN6S5ee6MZhf+Q ZYqko/XM5zD3XBfN5RmaXA

Note however that there is no guarantee the list is complete. It is possible that the libMobileGestalt.dylib binary does not include some obfuscated keys.

Obfuscated key -> key?

It is now possible to get the values for all the obfuscated keys… but we don't know the key and thus the meaning of the value. For example the following information is not really useful:

MGCopyAnswer("03hWmMtMs+4nzama4/PzHQ") = YES MGCopyAnswer("cBy4BcYs5YWtFHbBpt4C6A") = YES

Whereas if we knew the key, that would be much more interesting:

MGCopyAnswer("CameraLiveEffectsCapability") = YES MGCopyAnswer("DeviceSupportsHaptics") = YES

Can we get the key from the obfuscated key? As we have seen, Apple uses the weak MD5 algorithm to calculate the obfuscated key. Moreover we can guess the possible formats for the key based on the examples:

word (lowercase word)

Word 1 Word 2 …Word n (camel case words combination)

Word …Word (camel case words combination) word 1 -word 2 -…-word n (dash separated lowercase words)

This means that we can brute force the obfuscated keys to retrieve the keys with a good percentage of success.

Getting the list of raw MD5

To run a brute force attack, we first need to get the MD5 hashes. This is easy to get:

- (NSString *)md5StringForObfuscatedKey:(NSString *)inObfuscatedKey { if([inObfuscatedKey length] <= 0) return nil; // As seen in CalculateObfuscatedKey(), the last 2 base64 characters // are dropped because it's a useless "==" padding sequence. // To decode the base64 encoded string to the MD5 hash, // we need to append back the "==" padding sequence. NSString *base64String = [NSString stringWithFormat:@"%@==", inObfuscatedKey]; // Decode the base64 string NSData *md5Data = [[NSData alloc] initWithBase64EncodedString:base64String options:0]; if([md5Data length] < 16) return nil; // Format the MD5 hash const uint8_t *md5 = [md5Data bytes]; NSString *md5String = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", md5[0], md5[1], md5[2], md5[3], md5[4], md5[5], md5[6], md5[7], md5[8], md5[9], md5[10], md5[11], md5[12], md5[13], md5[14], md5[15]]; return md5String; }

You can get the list of the 646 md5 hashes here: md5hashes.txt

0055e1c6b685d5bbf26823250483993c 00915085e643c946ef23a46604c4fd0a 00e221d65ddc2320d794fe0a07fd3ce0 00f7a49c0e7964072ed0572e7ea54de1 010888a56d1479840a9e1cb675aec05e 01611f3f7c56874ab53233b7240cbf00 […] fdc31676853ff3ca5c8c9d5e83198863 fde8ff1d69aa9ca57f410a6d5e15199a fe5d0acf66a4bd2bc41d336665e6349d ff657c1fd87ffb3d14c4d52bf5a44b79 ffa1560918cdd7245d500046f6f17ca3 ffd96e1dead7b614683e836dfcf5644e

Now we just need to brute force these hashes…

hashcat

There are several good solutions to brute force MD5 hashes. I used hashcat (https://hashcat.net/hashcat/) because it supports macOS, it is GPU accelerated (OpenCL), it is open source and supports the attacks I wanted to perform.

Mask attack

A direct brute force attack is not practicable due to the large keyspace. But the first obvious attack is a mask attack. In a mask attack we provide a string with placeholders. The placeholder characters will be brute force with the specified charset. Such attack can quickly recover simple keys.

The keys to recover seem to mostly contain lowercase characters, uppercase characters, digits and dashes. hashcat provides several built-in charsets:

?l = abcdefghijklmnopqrstuvwxyz ?u = ABCDEFGHIJKLMNOPQRSTUVWXYZ ?d = 0123456789

In most of my mask attacks I used the custom charset ?l?u?d- that consists of the characters abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789- . In some cases when it would take too much time (or when targeting a specific format), I reduce the charset (to ?l for example).

With the mask attacks I quickly recovered some keys. For example I got the following keys after running hashcat -a 3 -m 0 md5hashes.txt -1 ?l?u?d- MGCopyAnswer?1?1?1 :

80accd25cc1e482580fa0206894409e7:MGCopyAnswermms 38fce1bd139952a09986060ccaf7b904:MGCopyAnswersms 6624a563161293269822653796b4975b:MGCopyAnswergps 3d4300aeb85ae0f15e3aa20d79044cdc:MGCopyAnswersim b29195ba30c49b20b30f39d7a33077a0:MGCopyAnswerapn

Explanation for hashcat -a 3 -m 0 md5hashes.txt -1 ?l?u?d- MGCopyAnswer?1?1?1 :

-a 3: set the attack mode to brute-force

-m 0: set the hash type to MD5

md5hashes.txt: the list of MD5 hashes to brute force

-1 ?l?u?d-: define the custom charset 1 to “abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-”

MGCopyAnswer?1?1?1: The mask to use for the attack. The brute force will try all words starting with MGCopyAnswer followed by 3 characters from the custom charset 1

4 characters keys could easily be recovered too using hashcat -a 3 -m 0 md5hashes.txt -1 ?l?u?d- MGCopyAnswer?1?1?1?1 :

36440e259d71745939495e793c52a522:MGCopyAnswerwlan 861fcda16a44a2ad551789460dd3d4a7:MGCopyAnswerrole 644174a68eb7b1382956b73d09eed835:MGCopyAnswerDMin 022d33b09437fac4c5914ebf94b6dde4:MGCopyAnsweropal 68d65e0b2b96c48e9213f2b0675dbdc0:MGCopyAnswername 874394c20e77bcaa7e20f7732c6e0dac:MGCopyAnswermesa 8621eeb7f591f81f4bc7fbddd16c9e36:MGCopyAnswerwapi 9ad1d97751fc5c9d83315b4d5544a46a:MGCopyAnswerwifi b8a73b14f9c43befa55611d61c59466d:MGCopyAnsweripad 5c4cc85d53e57afc6e108a59acc63ef0:MGCopyAnswerSkey 2e0d44257d7525bec46ef781ebe62055:MGCopyAnswer720p f59a922faf0c2724044b34050ef2aa5c:MGCopyAnswervoip

5 characters keys can be quickly recovered too with hashcat -a 3 -m 0 md5hashes.txt -1 ?l?u?d- MGCopyAnswer?1?1?1?1?1 :

e74fc29814d7ea38646fc67ad61cf085:MGCopyAnswerclass 3facfc78dad13dcbf401c28f30bd22a3:MGCopyAnswerwi-fi 87077d8a96fa79eccd95e379f7eea7d5:MGCopyAnswermetal 952a5ed501c8c9ad1a78dae32d3b5a24:MGCopyAnswerhidpi 1608e73243c93e92380b7f1d5844f0b7:MGCopyAnswerflash 90a809b1637fac150092298eb66ff06c:MGCopyAnswerarm64 31676eb801a9b6b97ba88cd6a8198ea9:MGCopyAnswerAWDID 83ef4da63992570b6899df27c8d2629a:MGCopyAnswerarmv6 0d6ae1ca1d41c18ca96265b9abbf16bb:MGCopyAnswerarmv7 67f4c94b421a2f2ab5d1d712bd44c63e:MGCopyAnswerDieId

Similar mask attacks can be used to recover keys with up to 7 characters. Starting with 8 characters the mask attack starts to take too much time with my hardware (multiple days).

It is however still possible to use the mask attack with more specific formats like:

hashcat -a 3 -m 0 md5hashes.txt -1 ?l MGCopyAnswer?1?1?1-?1?1?1?1 hashcat -a 3 -m 0 md5hashes.txt -1 ?l MGCopyAnswer?1?1-?1?1?1?1?1 hashcat -a 3 -m 0 md5hashes.txt -1 ?l MGCopyAnswer?1?1?1?1-?1?1?1 hashcat -a 3 -m 0 md5hashes.txt -1 ?l MGCopyAnswer?1?1?1?1?1-?1?1 hashcat -a 3 -m 0 md5hashes.txt -1 ?l MGCopyAnswer?1?1?1?1-?1?1?1?1 hashcat -a 3 -m 0 md5hashes.txt -1 ?l MGCopyAnswer?1?1?1?1?1?1-?1?1 hashcat -a 3 -m 0 md5hashes.txt -1 ?l MGCopyAnswer?1?1?1?1-?1?1?1?1?1 hashcat -a 3 -m 0 md5hashes.txt -1 ?l?u?d MGCopyAnswerDeviceSupports?1?1?1?1

The last example would give back:

a961958e794dff058c8655a07cd71206:MGCopyAnswerDeviceSupports9Pin 8e2e7a04ed6651e4fb420f513bb12bf7:MGCopyAnswerDeviceSupportsASTC abaf6f6aea8af5d8e73e5119045055e0:MGCopyAnswerDeviceSupportsSiDP 9701d14d934ee49abcee9565cdd34620:MGCopyAnswerDeviceSupports720p 5e47c655896b90140981a19a6c711225:MGCopyAnswerDeviceSupportsDClr

Dictionary attack

With mask attacks I quickly recovered simple keys (and later keys for which I could guess the format). Recovering more complex keys is inefficient and I switch to a dictionary attack. A dictionary attack (also known as wordlist attack) consists of trying all words from a list.

Using a simple English dictionary, I could recover a couple of keys but obviously the words in the dictionary are less than ideal.

I built a much better dictionary by extracting all the strings from iOS. This can be achieved with the following bash script ( this script can be downloaded here ExtractStrings.sh ):

#!/bin/bash #--------------------------------------------------------------------- # Bash script that loops through all the files of a folder # and extract the strings. # Created by Alexandre Colucci on 16.01.2017 # https://blog.timac.org/2017/0124-deobfuscating-libmobilegestalt-keys #--------------------------------------------------------------------- #--------------------------------------------------------------------- # Force expand a wildcard pattern into the list of matching pathnames #--------------------------------------------------------------------- shopt -s nullglob #--------------------------------------------------------------------- # Function to print the usage #--------------------------------------------------------------------- printUsage () { echo "Usage: ExtractStrings.sh IN_FOLDER_PATH OUT_FILE" echo "IN_FOLDER_PATH: Folder to extract strings from" echo "OUT_FILE: All the strings found will be saved to this text file" echo "" echo "Examples:" echo " ExtractStrings.sh /System/Library /tmp/output.txt" echo " ExtractStrings.sh /System /tmp/output.txt" echo " ExtractStrings.sh / /tmp/output.txt" echo "" echo "Note: run as root in order to avoid permission issues." echo "" } #--------------------------------------------------------------------- # Check if the script was called with the expected usage #--------------------------------------------------------------------- PARAMETER_NUMBER=$# PARAMETER_REQUIRED=2 if [ $PARAMETER_NUMBER != $PARAMETER_REQUIRED ]; then printUsage exit 1 fi #--------------------------------------------------------------------- # Get the folder path #--------------------------------------------------------------------- PATH_TO_CHECK=$1 OUTPUT_TXT_FILE=$2 echo "" echo "Start time:" date echo "" echo "Extract strings from ${PATH_TO_CHECK}" echo "Save strings to ${OUTPUT_TXT_FILE}" #--------------------------------------------------------------------- # Find all the files in all subdirectories and extract the strings #--------------------------------------------------------------------- find ${PATH_TO_CHECK} -type f -exec strings {} \; >> "${OUTPUT_TXT_FILE}" #--------------------------------------------------------------------- # Finalizing #--------------------------------------------------------------------- echo "" echo "Completed at:" date echo ""

A bunch of keys can be recovered with this dictionary by running hashcat -a 0 -m 0 md5hashes.txt dictionary.txt :

-a 0: set the attack mode to straight

-m 0: set the hash type to MD5

md5hashes.txt: the list of MD5 hashes to brute force

dictionary.txt: the dictionary containing all the words to check

Improved dictionary with regular expressions

The dictionary built by extracting the iOS strings contain a lot of duplicates. There are also Objective-C methods names which are probably not valid keys. The strings can be reformatted using regular expressions to get a better attack dictionary. I wrote several scripts to improve the dictionary. One example that you can download is the bash script ImproveDictionary.sh. What it does:

Remove duplicated strings

Replace characters other than a-z, A-Z, 0-9 by a return line

Uppercase the first letter of the lines

Split words by looking at the last uppercase character: ‘AnExampleOfWord’ -> ‘AnExampleOf’ and ‘Word’

Split words by looking at the first uppercase character: ‘AnExampleOfWord’ -> ‘An’ and ‘ExampleOfWord’

Note the ugly syntax for the regular expressions in this script. The reason is that I wanted the script to run out-of-the-box with sed built in macOS 10.12. Using GNU sed would have resulted in a much cleaner script.

Also note that the dictionary only targets the keys with the format Word 1 Word 2 …Word n (camel case words combination). I made a separate script to convert this dictionary to a dash separated dictionary in order to specifically target the keys with the format word 1 -word 2 -…-word n (dash separated lowercase words).

Running hashcat on this improved dictionary recovered some complex keys.

Combinator Attack

The dictionary attack recovered a lot of keys. But we can recover even more keys with a combinator attack. This attack uses 2 dictionaries and tries all combinations of a word from the first dictionary appended to a word from the second dictionary. For a combinator attack, the first dictionary could contain strings like:

MGCopyAnswerWord1 MGCopyAnswerWord2 MGCopyAnswerWord3 …

and the second dictionary strings like:

WordA WordB WordC …

In practice I used my previously generated dictionary as both left and right dictionaries and patched hashcat to always add the prefix MGCopyAnswer to each combined word candidate. Running this attack was perform with the command: hashcat -a 1 -m 0 md5hashes.txt dictionary.txt dictionary.txt :

-a 1: set the attack mode to combination

-m 0: set the hash type to MD5

md5hashes.txt: the list of MD5 hashes to brute force

dictionary.txt: the left dictionary

dictionary.txt: the right dictionary. As previously mentioned I used the same dictionary as both left and right dictionaries and modified hashcat.

I ran a similar combinator attack to specifically target the dash separated words format: hashcat -a 1 -m 0 md5hashes.txt dictionary.txt dictionary.txt -j '$-' . Note the extra option -j '$-' to append the dash character at the end of each word of the left dictionary.

List of all keys

After running all these different attacks, I managed to recover 564 out of 646 keys (87%). Here is the complete list of obfuscated key / key:

struct tKeyMapping { const char * obfuscatedKey; const char * key; }; static const struct tKeyMapping keyMappingTable[] = { "+3Uf0Pm5F8Xy7Onyvko0vA", "DeviceClass", "+Ce1uSqGUXaJPl/uT6ur8g", "SDIOProductInfo", "+U0jSj4F2EfE+Vqj22IavA", "tnr-mode-back", "+VIu65zA5EW4ztayJXvOUg", "device-name-localized", "+bL/lKwaIAv+fzmjsHYZdw", "N78aHack", "+fgL2ovGydvB5CWd1JI1qg", "has-sphere", "+zD41v0XRR72ItZHfisZuQ", NULL, "/2V8H9h/+z0UxNUr9aRLeQ", "boot-nonce", "/6FWCRjN1yRdUABG9vF8ow", "WiFiCallingCapability", "/9luHerXthRoPoNt/PVkTg", "VibratorCapability", "/GK+yfRFY/b5ZDIDpdVImg", "hardware-keyboard", "/Pop5T2XQdDA60MRyxQJdQ", "hall-effect-sensor", "/YYygAofPDbhrwToVsXdeA", "HWModelStr", "/bSMNaIuUT58N/BN1nYUjw", NULL, "/cMWdoU/88pcjJ1egxmIYw", "wlan.background-scan-cache", "/ej/HWmqnKV/QQptXhUZmg", "no-coreroutine", "/l0Kz2akvSvEHTNmZeY0nQ", "chip-id", "0/2HluYMd/whD80Hua4Rpw", "io-surface-backed-images", "0/7QNywWU4IqDcyvTv9UYQ", NULL, "0/VAyl58TL5U/mAQEJNRQw", NULL, "03hWmMtMs+4nzama4/PzHQ", "CameraLiveEffectsCapability", "0AFeHRmliNJ4pSlVb8ltZA", NULL, "0L5PkT61qoH1b/B1USWqjQ", "RegionalBehaviorChinaBrick", "0R2aiV2nJVu/v8I7Ex2GcQ", "RegionalBehaviorNoPasscodeLocationTiles", "0VkTunHOJrrZdolQXR5gCg", NULL, "0Y4fmR6ZHZPxDZFfPtBnRQ", "SysCfg", "0Yu30fwSQVPKvHVla17kXw", "umts-device", "0dnM19zBqLw5ZPhIo4GEkg", "SecureElement", "0jjK6IVSQzA8doQeSwmujA", "software-bundle-version", "0l4wqBtWEAK1tOkeBHkU6Q", "main-screen-pitch", "0pY9r1XBV1duZ8HO3tBvFg", "location-services", "0uthiXrHZ212KvcJizKHEw", "BoardId", "0uyHvVqOLpJQBpSl/rF3Vg", "kSimultaneousCallAndDataSupported", "16N2bLOzcgJEsZToEX21Zg", "accessibility", "1DQNgySZSIjPqLWroIzfiQ", "BacklightCapability", "1N14oS9TeyskaTU1DxpwoQ", "load-thumbnails-while-scrolling", "1Rm/mWYEI5ttaC0dJ3sHBQ", "BootNonce", "1X0zc2JwBdYOQrMAyP81DQ", "lte-device", "1gsBzuZsXu2rXZJBE01M0w", "FrontFacingCameraHFRCapability", "1oMPwMsqxTa9BJxUs8v06w", "PlatinumCapability", "1qDdT/85SS7sxriK0wIbbg", "main-screen-orientation", "1qJmMHedWOh43VwRKPdDrw", "iTunesFamilyID", "1rf3rZXIZFgznqrHlPehuQ", "FaceTimeBitRate3G", "1uZbhSbBhsNCsVSsopZ4qg", "dictation", "1z6Kk4xUAVLdaBPGugsDSA", "navigation", "2IDxmg5KyAMBBi/b0rojgQ", "telephony-maximum-generation", "2OK50OGmkXM1ospsh766WQ", NULL, "2aIAScwtFNCz+Y7WesMOCA", NULL, "2lNKobEIQqX50ohy1JBqCA", "no-hi-res-buildings", "2pxKjejpRGpWvUE+3yp5mQ", "cameraRestriction", "2sWGezz2RezScIJJgiIYQg", NULL, "38C0kq9NiVaMsqjlUsCHcQ", "ota-activation", "39ZkJVEsL4pmCXbg+89QmQ", "accelerometer", "3kmXfug8VcxLI5yEmsqQKw", NULL, "3m1Q0AXlqeA2C/LmqdTndQ", NULL, "3sF/uRq+X+mZ2zGHSJOwpw", "crypto-hash-method", "3yzXj0lJhQi+r3kgQlwiOg", NULL, "4+qmMh9JBDh72Nq6fD64RQ", "gyroscope", "475wW3fne+tyzGr4wleUSQ", "CarrierBundleInfoArray", "4I0hOaR3n80379Vka7u+Xg", "volume-buttons", "4Jfu4lqX8dzru4Z+ONQ1rQ", NULL, "4RwhtNOmePfUXmu57rh+KA", "LisaCapability", "4W7X4OWHjri5PGaAGsCWxw", NULL, "4fT83+9coO3VAUnlxuOOcw", NULL, "4k6Wv56SWfITjzet+hIHMQ", "multi-touch", "4snMZS8LJkSctKypt2m+xA", "not-green-tea", "4uzgAFPkzKUmlZG5HpFIkg", "RegionalBehaviorGoogleMail", "50/CmBTX6jhkb8Z61hzwhQ", "class", "566JrJVMlDfnslGpwUzNlQ", "ChipID", "57eLnXynqDlQaGEi+9JAtQ", "call-forwarding", "5MSZn7w3nnJp22VbpqaxLQ", "venice", "5MXFoiW2zgxfIbaaTb/wvA", "SecondaryEthernetMacAddressData", "5QM8apssQbhm2ZrUx5g5Tw", "pipelined-stillimage-capability", "5dyhCh3dm1vSOaNK+US1Qw", "euicc-chip-id", "5lAK1Xp+ezh1Qu+4jnHAOg", "SupportsSOS", "5mvQIwu3Mqqw/zOKmwGkWw", "ProximitySensorCalibrationDictionary", "5pYKlGnYYBzGvAlIU8RjEQ", "HardwarePlatform", "5tnvmEsHQKfCoieLEYpnvg", "RFExposureSeparationDistance", "5v2p6i7PyIMdWOK4n/+G4A", "proximity-sensor", "5y8gwXr/HXkhryza4xQeFg", NULL, "61xs1bQ+9eTk8tlRvG9UKw", "MicrophoneCount", "67x5O+zO+JwnGgmKlq+qdA", "DiagData", "6MnVtR+c9LeR46bMxvR5Yw", "RegionalBehaviorNoVOIP", "6PkKE66MnKm0yiOIQLknEg", "allow-32bit-apps", "6RrxXzvfw2GZeUPLKXxrmA", "RearFacingCamera60fpsVideoCaptureCapability", "6S9CvPHPtzHQqKudHSfsag", "haptics", "6UUmcaeT7rJoyUVmoPJd4A", "ProximitySensorCalibration", "6iI7/9cVUGIjdrSvIXEt4A", "RearCameraCapability", "6k70IxahfOQTZbGwu++QwA", "additional-text-tones", "6pjDdEw65TFyL1FmIdszXw", "hd-video-capture", "7D54DikSnFQnbDEBwlKQTQ", "DevicePrefersCheapTrafficShaders", "7DfjbzhvH/GDkhio1dv8fA", "HasSEP", "7IgVvZZLtNjMFdInQlKg6A", "SoftwareBehavior", "7VoVaBmSuokzovhUkiDx6Q", "SecondaryWifiMacAddress", "7W2eNk/f6uewC8N58mlRrQ", "FrontFacingCameraHDRCapability", "7l0BaQsNxJCanoeHMJ2huA", "AllowYouTube", "7mV26K/1a+wTtqiunvHMUQ", "PhosphorusCapability", "7ot70MKj7EdRIEEi91jlcg", "bitrate-3g", "7qHcAWI5X9b1SiyYIg/Byw", "ui-background-quality", "7yzVesPANxqKQ+oqNPhTwg", "applicationInstallation", "8/HMvzDR3J6m0aY3NYeqcg", "bluetooth-le", "8/tysfSvORoyVg9IE901oQ", "DeviceRGBColor", "81Zj1535/jeXbmfOndlIVA", "youtubePlugin", "82Ono2SP03rNGkhOc5O1Mw", NULL, "84iheBmhAmsxIlcxG4a0zA", NULL, "86GizkmSK+IxgCtUMOp2NA", "front-max-video-fps-720p", "87sSAh2rboMI2TDvFBimkg", "DeviceColorMapPolicy", "8DHlxr5ECKhTSL3HmlZQGQ", 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"yPSUYPhrVLHnvX0TUugiwg", "rear-auto-hdr", "yRZv0s7Dpj8ZBk0S+0+nMA", "contains-cellular-radio", "yUCaqT4KOwJpYEb+XDPq7g", "SIMStatus", "ybGkijAwLTwevankfVzsDQ", "MainScreenCanvasSizes", "yeQy+rgNoD7+YIY6mSVOhg", NULL, "yeaE9+OrN2WJlWkDroMtZg", "bitrate-wifi", "yhHcB0iH0d1XzPO/CFd3ow", "DeviceSupportsApplePencil", "yl8qmYPdAhFLeDBho10sdQ", NULL, "z+5gEULGC7aEYopBd4ggpA", NULL, "zDBaE8nqtDP8hY4pOa6iMw", NULL, "zHeENZu+wbg7PUprwNwBWg", "RegionInfo", "zJUWenIp94snlzBD1cub3g", "function-button_halleffect", "zP3kBA1Biwz2d6PTIIbmUQ", "ActivationProtocol", "zPSNnYDFk+x5ebOtenb3Eg", "auto-focus", "znvmheFkjr6hiqIK9TrCVw", "pressure", "zxMIgVSILN6S5ee6MZhf+Q", "NFCRadio", NULL, NULL };

MGCopyAnswerTable

Having the list of keys, I created a simple iOS app that displays all the key/value pairs of libMobileGestalt:

This app runs on iOS 10.2 - jailbreak is not required. Note that it relies on private APIs and as such you shouldn't use such code in shipping apps. You can download the source code here: MGCopyAnswerTable source

Conclusion

The libMobileGestalt library gives access to an incredible amount of useful data:

iOS information: DeviceName, ProductVersion, BuildVersion, DiskUsage, FirmwareVersion, …

Device capabilities: DeviceSupports4k, DeviceSupportsCarIntegration, DeviceSupportsHaptics, DeviceSupportsApplePencil, VibratorCapability, …

Camera capabilities: CameraLiveEffectsCapability, FrontFacingCameraHDRCapability, FaceTimeCameraSupportsHardwareFaceDetection, …

Device materials: DeviceRGBColor, DeviceCoverGlassColor, DeviceBackGlassMaterial, DeviceEnclosureMaterial, …

And a lot more: AirplaneMode, InternalBuild, FaceTimeBitRateLTE, MicrophoneCount, MinimumSupportediTunesVersion, …

It is strange that Apple only protected some of the key/value pairs behind an XPC service and not most of them. For the protected keys (like the BluetoothAddress ), you will get a nil value and see a warning in the logs:

MobileGestalt.c:549: no access to k5lVWbXuiZHLA17KGiVUAA (see <rdar://problem/11744455>)

Due to the use of a weak algorithm, it was possible to deobfuscate most of the keys. With more GPU computing power and/or more time, it should be possible to recover the missing keys. Note that some keys did not match the formats I targeted:

3Gvenice applicationInstallation cameraRestriction explicitContentRestriction function-button_halleffect function-button_ringerab kConferenceCallType kSimultaneousCallAndDataCurrentlySupported kSimultaneousCallAndDataSupported nfcWithRadio rear-max-video-frame_rate RF-exposure-separation-distance wlan.background-scan-cache youtubePlugin

Note: Before publishing this post, I discovered an excellent article from Jonathan Levin about libMobileGestalt.dylib. It provides a good overview and other details about libMobileGestalt.dylib and might be a good complement to this post.

Update 29.01.2017:

I updated the list of obfuscated keys to match the latest iOS release and to include some obfuscated keys I somehow missed. There are now 673 known obfuscated keys. I did not run a brute force to resolve the keys.

Update 26.11.2018:

You can read a new article with updated information about iOS 12 here: Deobfuscated libMobileGestalt keys (iOS 12)