Mercurial > dropbear
view libtomcrypt/notes/rsa-testvectors/rt.py @ 1930:299f4f19ba19
Add /usr/sbin and /sbin to default root PATH
When dropbear is used in a very restricted environment (such as in a
initrd), the default user shell is often also very restricted
and doesn't take care of setting the PATH so the user ends up
with the PATH set by dropbear. Unfortunately, dropbear always
sets "/usr/bin:/bin" as default PATH even for the root user
which should have /usr/sbin and /sbin too.
For a concrete instance of this problem, see the "Remote Unlocking"
section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/
It speaks of a bug in the initramfs script because it's written "blkid"
instead of "/sbin/blkid"... this is just because the scripts from the
initramfs do not expect to have a PATH without the sbin directories and
because dropbear is not setting the PATH appropriately for the root user.
I'm thus suggesting to use the attached patch to fix this misbehaviour (I
did not test it, but it's easy enough). It might seem anecdotic but
multiple Kali users have been bitten by this.
From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author | Raphael Hertzog <hertzog@debian.org> |
---|---|
date | Mon, 09 Jul 2018 16:27:53 +0200 |
parents | 6dba84798cd5 |
children |
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#!/usr/bin/env python import sys import os import hashlib def md5_for_file(path, block_size=256*128): ''' Block size directly depends on the block size of your filesystem to avoid performances issues Here I have blocks of 4096 octets (Default NTFS) ''' md5 = hashlib.md5() with open(path,'rb') as f: for chunk in iter(lambda: f.read(block_size), b''): md5.update(chunk) f.close() return md5.hexdigest() def read_until_ends(f, s): while True: l = f.readline() if l.strip().endswith(s): break return l def read_until_start(f, s): while True: l = f.readline() if l.startswith(s): break return l def read_hex(f): t = [] while True: l = f.readline() if l.strip() == '': break t.extend(l.strip().split(' ')) return t class NamedData(object): def __init__(self, name, data): self.name = name self.data = data def __str__(self): return " /* {0} */\n {1},\n {{ {2} }}\n".format(self.name, len(self.data), ', '.join('0x' + x for x in self.data)) def read_part(f, s): name = read_until_start(f, s).strip().lstrip('# ').rstrip(':') data = read_hex(f) e = NamedData(name, data) return e class RsaKey(object): def __init__(self, n, e, d, p, q, dP, dQ, qInv): self.n = n self.e = e self.d = d self.p = p self.q = q self.dP = dP self.dQ = dQ self.qInv = qInv def __str__(self): return "{{\n{0},\n{1},\n{2},\n{3},\n{4},\n{5},\n{6},\n{7}\n}}\n".format(self.n, self.e, self.d, self.p, self.q, self.dP, self.dQ, self.qInv) def read_key(f): if ftype.version == 1: read_until_start(f, '# Private key') n = read_part(f, ftype.n) e = read_part(f, ftype.e) d = read_part(f, ftype.d) p = read_part(f, ftype.p) q = read_part(f, ftype.q) dP = read_part(f, ftype.dP) dQ = read_part(f, ftype.dQ) qInv = read_part(f, ftype.qInv) k = RsaKey(n, e, d, p, q, dP, dQ, qInv) return k class Data(object): def __init__(self, name, obj1, obj2, obj3): self.name = name self.obj1 = obj1 self.obj2 = obj2 self.obj3 = obj3 def __str__(self): if self.obj3 == None: return "{{\n \"{0}\",\n{1},\n{2}\n}}\n,".format(self.name, self.obj1, self.obj2) else: return "{{\n \"{0}\",\n{1},\n{2},\n{3}\n}}\n,".format(self.name, self.obj1, self.obj2, self.obj3) def read_data(f): name = read_until_start(f, ftype.o).strip().lstrip('# ') obj1 = read_part(f, ftype.o1) obj2 = read_part(f, ftype.o2) if ftype.name == 'emsa': obj3 = None else: obj3 = read_part(f, ftype.o3) s = Data(name, obj1, obj2, obj3) return s class Example(object): def __init__(self, name, key, data): self.name = name self.key = key self.data = data def __str__(self): res = "{{\n \"{0}\",\n{1},\n{{".format(self.name, str(self.key)) for idx, d in enumerate(self.data, 1): if idx == 2: res += '#ifdef LTC_TEST_EXT\n' res += str(d) + '\n' if idx == ftype.numcases: res += '#endif /* LTC_TEST_EXT */\n' res += '}\n},' return res def read_example(f): name = read_until_start(f, '# Example').strip().lstrip('# ') key = read_key(f) l = read_until_start(f, ftype.sod) d = [] while l.strip().startswith(ftype.sod): if ftype.version == 1: f.seek(-len(l), os.SEEK_CUR) data = read_data(f) d.append(data) l = read_until_start(f, '#') e = Example(name, key, d) f.seek(-len(l), os.SEEK_CUR) return e class PkcsType(object): def __init__(self, name): if name == 'pss': self.o = '# RSASSA-PSS Signature Example' self.o1 = '# Message to be signed' self.o2 = '# Salt' self.o3 = '# Signature' elif name == 'oaep': self.o = '# RSAES-OAEP Encryption Example' self.o1 = '# Message to be encrypted' self.o2 = '# Seed' self.o3 = '# Encryption' elif name == 'emsa': self.o = '# PKCS#1 v1.5 Signature Example' self.o1 = '# Message to be signed' self.o2 = '# Signature' elif name == 'eme': self.o = '# PKCS#1 v1.5 Encryption Example' self.o1 = '# Message' self.o2 = '# Seed' self.o3 = '# Encryption' else: raise ValueError('Type unknown: ' + name) if name == 'pss' or name == 'oaep': self.version = 2 self.numcases = 6 self.n = '# RSA modulus n' self.e = '# RSA public exponent e' self.d = '# RSA private exponent d' self.p = '# Prime p' self.q = '# Prime q' self.dP = '# p\'s CRT exponent dP' self.dQ = '# q\'s CRT exponent dQ' self.qInv = '# CRT coefficient qInv' self.sod = '# --------------------------------' elif name == 'emsa' or name == 'eme': self.version = 1 self.numcases = 20 self.n = '# Modulus' self.e = '# Public exponent' self.d = '# Exponent' self.p = '# Prime 1' self.q = '# Prime 2' self.dP = '# Prime exponent 1' self.dQ = '# Prime exponent 2' self.qInv = '# Coefficient' self.sod = self.o self.name = name ftype = PkcsType(sys.argv[2]) print('/* Generated from file: %s\n * with md5 hash: %s\n */\n' % (sys.argv[1], md5_for_file(sys.argv[1]))) print(''' typedef struct rsaKey { int n_l; unsigned char n[256]; int e_l; unsigned char e[256]; int d_l; unsigned char d[256]; int p_l; unsigned char p[256]; int q_l; unsigned char q[256]; int dP_l; unsigned char dP[256]; int dQ_l; unsigned char dQ[256]; int qInv_l; unsigned char qInv[256]; } rsaKey_t; typedef struct rsaData { const char* name; int o1_l; unsigned char o1[256]; int o2_l; unsigned char o2[256];''') if ftype.name != 'emsa': print(''' int o3_l; unsigned char o3[256];''') print('''} rsaData_t; typedef struct testcase { const char* name; rsaKey_t rsa; #ifdef LTC_TEST_EXT rsaData_t data[%d]; #else rsaData_t data[1]; #endif /* LTC_TEST_EXT */ } testcase_t; testcase_t testcases_%s[] = {''' % (ftype.numcases, sys.argv[2])) with open(sys.argv[1], 'rb') as f: ex = [] while read_until_ends(f, '============================================='): if f.tell() == os.path.getsize(sys.argv[1]): break e = read_example(f) ex.append(e) for i in ex: print(i) f.close() print('};\n')