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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| import { Buffer } from 'node:buffer' | ||
| import { AUTHEN_TYPES, isAuthenService, isPrivLevel } from './common' | ||
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| export const AUTHEN_METHODS = { | ||
| TAC_PLUS_AUTHEN_METH_NOT_SET: 0x00, | ||
| TAC_PLUS_AUTHEN_METH_NONE: 0x01, | ||
| TAC_PLUS_AUTHEN_METH_KRB5: 0x02, | ||
| TAC_PLUS_AUTHEN_METH_LINE: 0x03, | ||
| TAC_PLUS_AUTHEN_METH_ENABLE: 0x04, | ||
| TAC_PLUS_AUTHEN_METH_LOCAL: 0x05, | ||
| TAC_PLUS_AUTHEN_METH_TACACSPLUS: 0x06, | ||
| TAC_PLUS_AUTHEN_METH_GUEST: 0x08, | ||
| TAC_PLUS_AUTHEN_METH_RADIUS: 0x10, | ||
| TAC_PLUS_AUTHEN_METH_KRB4: 0x11, | ||
| TAC_PLUS_AUTHEN_METH_RCMD: 0x20, | ||
| } as const | ||
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| const ALLOWED_AUTHEN_METHODS = Object.values(AUTHEN_METHODS) | ||
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| type AuthenMethod = typeof ALLOWED_AUTHEN_METHODS[number] | ||
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| function isAuthenMethod(maybeAuthenMethod: number): maybeAuthenMethod is AuthenMethod { | ||
| return (ALLOWED_AUTHEN_METHODS as number[]).includes(maybeAuthenMethod) | ||
| } | ||
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| export const AUTHORIZATION_AUTHEN_TYPES = { | ||
| ...AUTHEN_TYPES, | ||
| TAC_PLUS_AUTHEN_TYPE_NOT_SET: 0x00, | ||
| } as const | ||
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| export const ALLOWED_AUTHORIZATION_AUTHEN_TYPES = Object.values(AUTHORIZATION_AUTHEN_TYPES) | ||
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| export type AuthorizationAuthenType = typeof ALLOWED_AUTHORIZATION_AUTHEN_TYPES[number] | ||
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| interface UnknownAuthorizationRequest { | ||
| authenMethod: number | ||
| privLvl: number | ||
| authenType: number | ||
| authenService: number | ||
| } | ||
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| function _validateAuthorizationRequest({ authenMethod, privLvl, authenType, authenService }: UnknownAuthorizationRequest) { | ||
| if (!isAuthenMethod(authenMethod)) { | ||
| throw new Error('Invalid authen method') | ||
| } | ||
|
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| if (!isPrivLevel(privLvl)) { | ||
| throw new Error('Invalid privilege level') | ||
| } | ||
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| if (!isAuthorizationAuthenType(authenType)) { | ||
| throw new Error('Invalid authen type') | ||
| } | ||
|
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| if (!isAuthenService(authenService)) { | ||
| throw new Error('Invalid authen service') | ||
| } | ||
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| return { | ||
| authenMethod, | ||
| privLvl, | ||
| authenType, | ||
| authenService, | ||
| } | ||
| } | ||
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| export function isAuthorizationAuthenType(maybeAuthenType: number): maybeAuthenType is AuthorizationAuthenType { | ||
| return (ALLOWED_AUTHORIZATION_AUTHEN_TYPES as number[]).includes(maybeAuthenType) | ||
| } | ||
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| export const AUTHORIZATION_STATUS = { | ||
| TAC_PLUS_AUTHOR_STATUS_PASS_ADD: 0x01, | ||
| TAC_PLUS_AUTHOR_STATUS_PASS_REPL: 0x02, | ||
| TAC_PLUS_AUTHOR_STATUS_FAIL: 0x10, | ||
| TAC_PLUS_AUTHOR_STATUS_ERROR: 0x11, | ||
| TAC_PLUS_AUTHOR_STATUS_FOLLOW: 0x21, | ||
| } as const | ||
|
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| export const ALLOWED_AUTHORIZATION_STATUS = Object.values(AUTHORIZATION_STATUS) | ||
|
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| type AuthorizationStatus = typeof ALLOWED_AUTHORIZATION_STATUS[number] | ||
|
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| function isAuthorizationStatus(maybeStatus: number): maybeStatus is AuthorizationStatus { | ||
| return (ALLOWED_AUTHORIZATION_STATUS as number[]).includes(maybeStatus) | ||
| } | ||
|
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| interface UnknownAuthorizationReply { | ||
| status: number | ||
| } | ||
|
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| function _validateAuthReply({ status }: UnknownAuthorizationReply) { | ||
| if (!isAuthorizationStatus(status)) { | ||
| throw new Error('Invalid status') | ||
| } | ||
|
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| return { status } | ||
| } | ||
|
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| export class Authorization { | ||
| static createAuthRequest(args: CreateAuthorizationRequestArgs) { | ||
| const username = args.username | ||
| const authenMethod = args.authenMethod | ||
| const privLvl = args.privLvl | ||
| const authenType = args.authenType | ||
| const service = args.service | ||
| const argss = args.arguments ?? [] | ||
| const remAddr = args.remAddr ?? '' | ||
| const port = args.port ?? '' | ||
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| const usernameBuffer = Buffer.from(username) | ||
| const remAddrBuffer = Buffer.from(remAddr) | ||
| const portBuffer = Buffer.from(port) | ||
|
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| const headerLength = 8 | ||
| const argLenSum = argss.reduce((sum, arg) => sum + Buffer.byteLength(arg), 0) | ||
| const totalLength = headerLength + usernameBuffer.length + remAddrBuffer.length + portBuffer.length + argLenSum | ||
|
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| const header = Buffer.alloc(totalLength) | ||
| header.writeUInt8(authenMethod, 0) | ||
| header.writeUInt8(privLvl, 1) | ||
| header.writeUInt8(authenType, 2) | ||
| header.writeUInt8(service, 3) | ||
| header.writeUInt8(usernameBuffer.length, 4) | ||
| header.writeUInt8(portBuffer.length, 5) | ||
| header.writeUInt8(remAddrBuffer.length, 6) | ||
| header.writeUInt8(argss.length, 7) | ||
|
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| let offset = headerLength | ||
| for (const arg of argss) { | ||
| const argBuffer = Buffer.from(arg) | ||
| header.writeUInt8(argBuffer.length, offset) | ||
| offset++ | ||
| } | ||
|
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| offset = headerLength | ||
| header.write(username, offset) | ||
| offset += usernameBuffer.length | ||
| header.write(port, offset) | ||
| offset += portBuffer.length | ||
| header.write(remAddr, offset) | ||
| offset += remAddrBuffer.length | ||
|
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| for (const arg of argss) { | ||
| const argBuffer = Buffer.from(arg) | ||
| header.write(argBuffer.toString(), offset) | ||
| offset += argBuffer.length | ||
| } | ||
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| return header | ||
| } | ||
|
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| static readonly REQUEST_MIN_LENGTH = 8 | ||
| static readonly REPLY_MIN_LENGTH = 6 | ||
| } |
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