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Use codesign verification to do dmc check

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This commit is contained in:
Anakin Zheng
2014-05-19 22:50:16 -04:00
parent 1eae87aede
commit 93c7f15214
2 changed files with 28 additions and 17 deletions
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37
Classes/smcWrapper.m
View File

@ -24,8 +24,6 @@
#import "smcWrapper.h" #import "smcWrapper.h"
#import <CommonCrypto/CommonDigest.h> #import <CommonCrypto/CommonDigest.h>
//TODO: This is the smcFanControl 2.5ß checksum, it needs to be updated for the next release.
NSString * const smc_checksum=@"03548c5634bd01315b19c46bf329cceb";
static NSArray *allSensors = nil; static NSArray *allSensors = nil;
@ -153,26 +151,39 @@ static NSArray *allSensors = nil;
} }
+ (NSString*)createCheckSum:(NSString*)path { + (BOOL)validateSMC:(NSString*)path
NSData *d=[NSData dataWithContentsOfMappedFile:path]; {
unsigned char result[CC_MD5_DIGEST_LENGTH]; SecStaticCodeRef ref = NULL;
CC_MD5((void *)[d bytes], [d length], result);
NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH*2]; NSURL * url = [NSURL URLWithString:path];
int i;
for(i = 0; i<CC_MD5_DIGEST_LENGTH; i++) { OSStatus status;
[ret appendFormat:@"%02x",result[i]];
// obtain the cert info from the executable
status = SecStaticCodeCreateWithPath((CFURLRef)url, kSecCSDefaultFlags, &ref);
if (status != noErr) {
return false;
} }
return ret;
status = SecStaticCodeCheckValidity(ref, kSecCSDefaultFlags, nil);
if (status != noErr) {
NSLog(@"Codesign verification failed: Error id = %d",status);
return false;
}
return true;
} }
//call smc binary with setuid rights and apply //call smc binary with setuid rights and apply
// The smc binary is given root permissions in FanControl.m with the setRights method. // The smc binary is given root permissions in FanControl.m with the setRights method.
+(void)setKey_external:(NSString *)key value:(NSString *)value{ +(void)setKey_external:(NSString *)key value:(NSString *)value{
NSString *launchPath = [[NSBundle mainBundle] pathForResource:@"smc" ofType:@""]; NSString *launchPath = [[NSBundle mainBundle] pathForResource:@"smc" ofType:@""];
NSString *checksum=[smcWrapper createCheckSum:launchPath];
//first check if it's the right binary (security) //first check if it's the right binary (security)
// MW: Disabled smc binary checksum. This should be re-enabled in an official release. // MW: Disabled smc binary checksum. This should be re-enabled in an official release.
if (![checksum isEqualToString:smc_checksum]) { if (![smcWrapper validateSMC:launchPath]) {
NSLog(@"smcFanControl: Security Error: smc-binary is not the distributed one"); NSLog(@"smcFanControl: Security Error: smc-binary is not the distributed one");
return; return;
} }

8
smcFanControl.xcodeproj/project.pbxproj
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@ -433,8 +433,8 @@
ALWAYS_SEARCH_USER_PATHS = NO; ALWAYS_SEARCH_USER_PATHS = NO;
CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x"; CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
CLANG_WARN__DUPLICATE_METHOD_MATCH = YES; CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
CODE_SIGN_IDENTITY = "Mac Developer"; CODE_SIGN_IDENTITY = "Mac Developer: Yancheng Zheng (5FNT3EVMK3)";
"CODE_SIGN_IDENTITY[sdk=macosx*]" = "Mac Developer"; "CODE_SIGN_IDENTITY[sdk=macosx*]" = "Mac Developer: Yancheng Zheng (5FNT3EVMK3)";
COPY_PHASE_STRIP = NO; COPY_PHASE_STRIP = NO;
GCC_C_LANGUAGE_STANDARD = gnu99; GCC_C_LANGUAGE_STANDARD = gnu99;
GCC_DYNAMIC_NO_PIC = NO; GCC_DYNAMIC_NO_PIC = NO;
@ -460,8 +460,8 @@
ALWAYS_SEARCH_USER_PATHS = NO; ALWAYS_SEARCH_USER_PATHS = NO;
CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x"; CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
CLANG_WARN__DUPLICATE_METHOD_MATCH = YES; CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
CODE_SIGN_IDENTITY = "Mac Developer"; CODE_SIGN_IDENTITY = "Mac Developer: Yancheng Zheng (5FNT3EVMK3)";
"CODE_SIGN_IDENTITY[sdk=macosx*]" = "Mac Developer"; "CODE_SIGN_IDENTITY[sdk=macosx*]" = "Mac Developer: Yancheng Zheng (5FNT3EVMK3)";
COPY_PHASE_STRIP = YES; COPY_PHASE_STRIP = YES;
DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym"; DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
GCC_C_LANGUAGE_STANDARD = gnu99; GCC_C_LANGUAGE_STANDARD = gnu99;