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added apticket buildidentity verification for restore.

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Makes sure apticket is valid for the selected restore
This commit is contained in:
tihmstar 2017-01-04 00:19:31 +01:00
parent 7c34c55a86
commit 91ae806679
2 changed files with 42 additions and 0 deletions
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41
futurerestore/futurerestore.cpp
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@ -140,6 +140,25 @@ plist_t futurerestore::nonceMatchesApTickets(){
return NULL;
}
const char *futurerestore::nonceMatchesIM4Ms(){
if (!_didInit) reterror(-1, "did not init\n");
if (getDeviceMode(true) != MODE_RECOVERY) reterror(-10, "Device not in recovery mode, can't check apnonce\n");
unsigned char* realnonce;
int realNonceSize = 0;
recovery_get_ap_nonce(_client, &realnonce, &realNonceSize);
vector<const char*>nonces;
for (int i=0; i< _im4ms.size(); i++){
if (memcmp(realnonce, (unsigned const char*)getNonceFromIM4M(_im4ms[i],NULL), realNonceSize) == 0) return _im4ms[i];
}
return NULL;
}
void futurerestore::waitForNonce(vector<const char *>nonces, size_t nonceSize){
if (!_didInit) reterror(-1, "did not init\n");
setAutoboot(false);
@ -304,8 +323,30 @@ int futurerestore::doRestore(const char *ipsw, bool noerase){
if (!(sep_build_identity = getBuildidentityWithBoardconfig(_sepbuildmanifest, client->device->hardware_model, noerase)))
reterror(-5,"ERROR: Unable to find any build identities for SEP\n");
//this is the buildidentity used for restore
plist_t manifest = plist_dict_get_item(build_identity, "Manifest");
printf("checking APTicket to be valid for this restore...\n");
plist_t ticketIdentity = getBuildIdentityForIM4M(nonceMatchesIM4Ms(), buildmanifest);
//TODO: make this nicer!
//for now a simple pointercompare should be fine, because both plist_t should point into the same buildidentity inside the buildmanifest
if (ticketIdentity != build_identity){
error("BuildIdentity selected for restore does not match APTicket\n\n");
printf("BuildIdentity selected for restore:\n");
printGeneralBuildIdentityInformation(build_identity);
printf("\nBuildIdentiy valid for the APTicket:\n");
if (ticketIdentity) printGeneralBuildIdentityInformation(ticketIdentity),putchar('\n');
else{
printf("IM4M is not valid for any restore within the Buildmanifest\n");
printf("This APTicket can't be used for restoring this firmware\n");
}
reterror(-44, "APTicket can't be used for this restore\n");
}else{
printf("Verified APTicket to be valid for this restore\n");
}
if (_basebandbuildmanifest){
if (!(bb_build_identity = getBuildidentityWithBoardconfig(_basebandbuildmanifest, client->device->hardware_model, noerase)))

1
futurerestore/futurerestore.hpp
View file

@ -61,6 +61,7 @@ public:
void loadAPTickets(const vector<const char *> &apticketPaths);
plist_t nonceMatchesApTickets();
const char *nonceMatchesIM4Ms();
void loadFirmwareTokens();
const char *getDeviceModelNoCopy();