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Added ability to trust external signing keys to rnodeconf

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This commit is contained in:
Mark Qvist 2023-05-09 15:31:02 +02:00
parent 3967ef453d
commit e82e6d56f1
1 changed files with 55 additions and 2 deletions
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57
RNS/Utilities/rnodeconf.py
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@ -236,6 +236,7 @@ try:
FWD_DIR = CNF_DIR+"/firmware"
EXT_DIR = CNF_DIR+"/extracted"
RT_PATH = CNF_DIR+"/recovery_esptool.py"
TK_DIR = CNF_DIR+"/trusted_keys"
if not os.path.isdir(CNF_DIR):
os.makedirs(CNF_DIR)
@ -245,6 +246,8 @@ try:
os.makedirs(FWD_DIR)
if not os.path.isdir(EXT_DIR):
os.makedirs(EXT_DIR)
if not os.path.isdir(TK_DIR):
os.makedirs(TK_DIR)
except Exception as e:
print("No access to directory "+str(CNF_DIR)+". This utility needs file system access to store firmware and data files. Cannot continue.")
@ -817,6 +820,35 @@ class RNode():
RNS.log("Could not deserialize local signing key")
RNS.log(str(e))
# Try loading trusted signing key for
# validation of devices
if os.path.isdir(TK_DIR):
for f in os.listdir(TK_DIR):
if os.path.isfile(TK_DIR+"/"+f) and f.endswith(".pubkey"):
try:
file = open(TK_DIR+"/"+f, "rb")
public_bytes = file.read()
file.close()
try:
public_bytes_hex = RNS.hexrep(public_bytes, delimit=False)
vendor_keys = []
for known in known_keys:
vendor_keys.append(known[1])
if not public_bytes_hex in vendor_keys:
local_key_entry = ["LOCAL", public_bytes_hex]
known_keys.append(local_key_entry)
except Exception as e:
RNS.log("Could not deserialize trusted signing key "+str(f))
RNS.log(str(e))
except Exception as e:
RNS.log("Could not load trusted signing key"+str(f))
for known in known_keys:
vendor = known[0]
public_hexrep = known[1]
@ -1119,12 +1151,14 @@ def main():
parser.add_argument("--eeprom-dump", action="store_true", help="Dump EEPROM to console")
parser.add_argument("--eeprom-wipe", action="store_true", help="Unlock and wipe EEPROM")
parser.add_argument("-P", "--public", action="store_true", help="Display public part of signing key")
parser.add_argument("--trust-key", action="store", metavar="hexbytes", type=str, default=None, help="Public key to trust for device verification")
parser.add_argument("--version", action="store_true", help="Print program version and exit")
parser.add_argument("-f", "--flash", action="store_true", help=argparse.SUPPRESS) # Flash firmware and bootstrap EEPROM
parser.add_argument("-r", "--rom", action="store_true", help=argparse.SUPPRESS) # Bootstrap EEPROM without flashing firmware
parser.add_argument("-k", "--key", action="store_true", help=argparse.SUPPRESS) # Generate a new signing key and exit
parser.add_argument("-P", "--public", action="store_true", help=argparse.SUPPRESS) # Display public part of signing key
parser.add_argument("-S", "--sign", action="store_true", help=argparse.SUPPRESS) # Display public part of signing key
parser.add_argument("-H", "--firmware-hash", action="store", help=argparse.SUPPRESS) # Display public part of signing key
parser.add_argument("--platform", action="store", metavar="platform", type=str, default=None, help=argparse.SUPPRESS) # Platform specification for device bootstrap
@ -1169,7 +1203,7 @@ def main():
if args.nocheck:
upd_nocheck = True
if args.public or args.key or args.flash or args.rom or args.autoinstall:
if args.public or args.key or args.flash or args.rom or args.autoinstall or args.trust_key:
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
@ -1180,6 +1214,25 @@ def main():
clear = lambda: os.system('clear')
if args.trust_key:
try:
public_bytes = bytes.fromhex(args.trust_key)
try:
public_key = load_der_public_key(public_bytes, backend=default_backend())
key_hash = hashlib.sha256(public_bytes).hexdigest()
RNS.log("Trusting key: "+str(key_hash))
f = open(TK_DIR+"/"+str(key_hash)+".pubkey", "wb")
f.write(public_bytes)
f.close()
except Exception as e:
RNS.log("Could not create public key from supplied data. Check that the key format is valid.")
RNS.log(str(e))
except Exception as e:
RNS.log("Invalid key data supplied")
exit(0)
if args.use_extracted and ((args.update and args.port != None) or args.autoinstall):
print("")
print("You have specified that rnodeconf should use a firmware extracted")