Andrew Boyson
Common stuff for all my devices' web server pages: css, login, log, ipv4, ipv6, firmware update, clock, reset info etc.
Dependents: oldheating gps motorhome heating
Security
A password has to be set whenever there has been a software reset. Resets following faults or power on do not require a new password as the hash is restored from the RTC GPREG register.
The password is not saved on the device; instead a 32 bit hash of the password is saved. It would take 2^31 attempts to brute force the password: this could be done in under a month if an attempt were possible every millisecond. To prevent this a 200 ms delay is introduced in the reply to the login form, that gives a more reasonable 13 years to brute force the password.
Once the password is accepted a random session id is created. This is 36 bit to give six base 64 characters but without an extra delay. If an attempt could be made every ms then this would still take over a year to brute force.
The most likely attack would to use a dictionary with, say, 10 million entries against the password which would still take 20 days to do.
base/net/web-net-class.inc@127:bd6dd135009d, 2019-07-31 (annotated)
- Committer:
- andrewboyson
- Date:
- Wed Jul 31 15:09:15 2019 +0000
- Revision:
- 127:bd6dd135009d
- Parent:
- 110:8ab752842d25
- Child:
- 145:d2bd78be00b2
Amalgamated Reply into Poll function
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| andrewboyson | 96:eb2eb75bad0f | 1 | "//Net class\n" |
| andrewboyson | 96:eb2eb75bad0f | 2 | "'use strict';\n" |
| andrewboyson | 96:eb2eb75bad0f | 3 | "\n" |
| andrewboyson | 96:eb2eb75bad0f | 4 | "class Net\n" |
| andrewboyson | 96:eb2eb75bad0f | 5 | "{\n" |
| andrewboyson | 96:eb2eb75bad0f | 6 | " static makeIp4(text)\n" |
| andrewboyson | 96:eb2eb75bad0f | 7 | " {\n" |
| andrewboyson | 96:eb2eb75bad0f | 8 | " let result = '';\n" |
| andrewboyson | 96:eb2eb75bad0f | 9 | " result += parseInt(text.substr(6, 2), 16).toString();\n" |
| andrewboyson | 96:eb2eb75bad0f | 10 | " result += '.';\n" |
| andrewboyson | 96:eb2eb75bad0f | 11 | " result += parseInt(text.substr(4, 2), 16).toString();\n" |
| andrewboyson | 96:eb2eb75bad0f | 12 | " result += '.';\n" |
| andrewboyson | 96:eb2eb75bad0f | 13 | " result += parseInt(text.substr(2, 2), 16).toString();\n" |
| andrewboyson | 96:eb2eb75bad0f | 14 | " result += '.';\n" |
| andrewboyson | 96:eb2eb75bad0f | 15 | " result += parseInt(text.substr(0, 2), 16).toString();\n" |
| andrewboyson | 96:eb2eb75bad0f | 16 | " return result;\n" |
| andrewboyson | 96:eb2eb75bad0f | 17 | " }\n" |
| andrewboyson | 96:eb2eb75bad0f | 18 | " static makeMac(text)\n" |
| andrewboyson | 96:eb2eb75bad0f | 19 | " {\n" |
| andrewboyson | 96:eb2eb75bad0f | 20 | " text = text.toLowerCase();\n" |
| andrewboyson | 96:eb2eb75bad0f | 21 | " let result = '';\n" |
| andrewboyson | 96:eb2eb75bad0f | 22 | " result += text.substr( 0, 2);\n" |
| andrewboyson | 96:eb2eb75bad0f | 23 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 24 | " result += text.substr( 2, 2);\n" |
| andrewboyson | 96:eb2eb75bad0f | 25 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 26 | " result += text.substr( 4, 2);\n" |
| andrewboyson | 96:eb2eb75bad0f | 27 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 28 | " result += text.substr( 6, 2);\n" |
| andrewboyson | 96:eb2eb75bad0f | 29 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 30 | " result += text.substr( 8, 2);\n" |
| andrewboyson | 96:eb2eb75bad0f | 31 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 32 | " result += text.substr(10, 2);\n" |
| andrewboyson | 96:eb2eb75bad0f | 33 | " return result;\n" |
| andrewboyson | 96:eb2eb75bad0f | 34 | " }\n" |
| andrewboyson | 96:eb2eb75bad0f | 35 | "\n" |
| andrewboyson | 96:eb2eb75bad0f | 36 | " static hexToBit(text, iBit)\n" |
| andrewboyson | 96:eb2eb75bad0f | 37 | " {\n" |
| andrewboyson | 96:eb2eb75bad0f | 38 | " let value = parseInt(text, 16);\n" |
| andrewboyson | 96:eb2eb75bad0f | 39 | " value >>= iBit;\n" |
| andrewboyson | 96:eb2eb75bad0f | 40 | " return value & 1;\n" |
| andrewboyson | 96:eb2eb75bad0f | 41 | " }\n" |
| andrewboyson | 96:eb2eb75bad0f | 42 | " static makeIp6(text)\n" |
| andrewboyson | 96:eb2eb75bad0f | 43 | " {\n" |
| andrewboyson | 96:eb2eb75bad0f | 44 | " function makeWord(text)\n" |
| andrewboyson | 96:eb2eb75bad0f | 45 | " {\n" |
| andrewboyson | 96:eb2eb75bad0f | 46 | " let word = parseInt(text, 16);\n" |
| andrewboyson | 96:eb2eb75bad0f | 47 | " if (word === 0) return '';\n" |
| andrewboyson | 96:eb2eb75bad0f | 48 | " return word.toString(16);\n" |
| andrewboyson | 96:eb2eb75bad0f | 49 | " }\n" |
| andrewboyson | 96:eb2eb75bad0f | 50 | " text = text.toLowerCase();\n" |
| andrewboyson | 96:eb2eb75bad0f | 51 | " let result = '';\n" |
| andrewboyson | 96:eb2eb75bad0f | 52 | " result += makeWord(text.substr( 0, 4));\n" |
| andrewboyson | 96:eb2eb75bad0f | 53 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 54 | " result += makeWord(text.substr( 4, 4));\n" |
| andrewboyson | 96:eb2eb75bad0f | 55 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 56 | " result += makeWord(text.substr( 8, 4));\n" |
| andrewboyson | 96:eb2eb75bad0f | 57 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 58 | " result += makeWord(text.substr(12, 4));\n" |
| andrewboyson | 96:eb2eb75bad0f | 59 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 60 | " result += makeWord(text.substr(16, 4));\n" |
| andrewboyson | 96:eb2eb75bad0f | 61 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 62 | " result += makeWord(text.substr(20, 4));\n" |
| andrewboyson | 96:eb2eb75bad0f | 63 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 64 | " result += makeWord(text.substr(24, 4));\n" |
| andrewboyson | 96:eb2eb75bad0f | 65 | " result += ':';\n" |
| andrewboyson | 96:eb2eb75bad0f | 66 | " result += makeWord(text.substr(28, 4));\n" |
| andrewboyson | 96:eb2eb75bad0f | 67 | " return result;\n" |
| andrewboyson | 96:eb2eb75bad0f | 68 | " }\n" |
| andrewboyson | 96:eb2eb75bad0f | 69 | "}" |