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core-20261017T201717Z-057348c4a70f Добавено: Дата, която не е регистрирана · Построена: 2026-10-17 22:17

authorizedKeys.js Добавено: Дата, която не е регистрирана 6.3 KB · 146 линии

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1"use strict";

3const crypto = require("node:crypto");

5// authorized_keys handling works on latin1 strings so every byte of unrelated lines,

6// including options, comments and line endings, is written back unchanged.

7const KEY_TYPE_PATTERN = /^(?:ssh-|ecdsa-|sk-)[A-Za-z0-9@._-]{1,80}$/;

8const ADDABLE_TYPES = new Set(["ssh-ed25519", "sk-ssh-ed25519@openssh.com"]);

9const MAX_KEYS_FILE_BYTES = 256 * 1024;

10const MAX_COMMENT_LENGTH = 200;

12class KeyError extends Error {

13 constructor(code, message) {

14 super(message);

15 this.code = code;

16 }

17}

19function fingerprint(blob) {

20 return `SHA256:${crypto.createHash("sha256").update(blob).digest("base64").replace(/=+$/, "")}`;

21}

23function readSshString(buffer, offset) {

24 if (offset + 4 > buffer.length) return null;

25 const length = buffer.readUInt32BE(offset);

26 if (length > buffer.length - offset - 4) return null;

27 return { value: buffer.subarray(offset + 4, offset + 4 + length), next: offset + 4 + length };

28}

30function decodeBlob(type, base64) {

31 if (!/^[A-Za-z0-9+/]+={0,2}$/.test(base64) || base64.length % 4 !== 0) return null;

32 const blob = Buffer.from(base64, "base64");

33 const embedded = readSshString(blob, 0);

34 if (!embedded || embedded.value.toString("latin1") !== type) return null;

35 if (type === "ssh-ed25519") {

36 const key = readSshString(blob, embedded.next);

37 if (!key || key.value.length !== 32 || key.next !== blob.length) return null;

38 }

39 return blob;

40}

42function skipOptions(text) {

43 let quoted = false;

44 for (let index = 0; index < text.length; index += 1) {

45 const character = text[index];

46 if (character === "\\" && quoted) { index += 1; continue; }

47 if (character === "\"") quoted = !quoted;

48 else if (!quoted && (character === " " || character === "\t")) return index;

49 }

50 return -1;

51}

53function utf8(text) {

54 return Buffer.from(text, "latin1").toString("utf8").replace(/[\x00-\x1f\x7f]/g, " ").trim();

55}

57function parseLine(raw, lineNumber) {

58 const text = raw.replace(/\r$/, "").trim();

59 if (!text || text.startsWith("#")) return null;

60 let options = "";

61 let rest = text;

62 const firstToken = text.split(/[ \t]/, 1)[0];

63 if (!KEY_TYPE_PATTERN.test(firstToken)) {

64 const end = skipOptions(text);

65 if (end < 0) return { line: lineNumber, valid: false, reason: "unparsed" };

66 options = text.slice(0, end);

67 rest = text.slice(end).trim();

68 }

69 const [type = "", data = "", ...commentParts] = rest.split(/[ \t]+/);

70 if (!KEY_TYPE_PATTERN.test(type)) return { line: lineNumber, valid: false, reason: "type" };

71 const blob = decodeBlob(type, data);

72 if (!blob) return { line: lineNumber, valid: false, type, reason: "data" };

73 return {

74 line: lineNumber,

75 valid: true,

76 type,

77 ed25519: type === "ssh-ed25519" || type === "sk-ssh-ed25519@openssh.com",

78 fingerprint: fingerprint(blob),

79 comment: utf8(commentParts.join(" ")).slice(0, MAX_COMMENT_LENGTH),

80 options: utf8(options).slice(0, 500),

81 blob: blob.toString("base64")

82 };

83}

85function parseAuthorizedKeys(content) {

86 const text = Buffer.isBuffer(content) ? content.toString("latin1") : String(content || "");

87 return text.split("\n").map((raw, index) => parseLine(raw, index + 1)).filter(Boolean);

88}

90// Accepts exactly one OpenSSH public key line without options. Only Ed25519 keys may be added.

91function normalizePublicKey(input, comment) {

92 const text = String(input || "").replace(/^/, "").trim();

  if (!text || text.length > 16 * 1024) throw new KeyError("USERS_KEY_INVALID", "Paste exactly one OpenSSH public key.");

94 const lines = text.split(/\r?\n/).map((line) => line.trim()).filter((line) => line && !line.startsWith("#"));

95 if (lines.length !== 1) throw new KeyError("USERS_KEY_INVALID", "Paste exactly one OpenSSH public key.");

  if (/PRIVATE KEY/.test(text)) throw new KeyError("USERS_KEY_PRIVATE", "This is a private key. Only public keys are uploaded to the server.");

97 const [type = "", data = "", ...commentParts] = lines[0].split(/\s+/);

  if (!KEY_TYPE_PATTERN.test(type)) throw new KeyError("USERS_KEY_INVALID", "Key options are not accepted; paste the plain public key.");

  if (!ADDABLE_TYPES.has(type)) throw new KeyError("USERS_KEY_TYPE_UNSUPPORTED", "Only Ed25519 public keys can be added.");

100 const blob = decodeBlob(type, data);

101 if (!blob) throw new KeyError("USERS_KEY_INVALID", "The public key data is invalid.");

102

  const finalComment = String(comment ?? commentParts.join(" ")).replace(/[\x00-\x1f\x7f]/g, " ").replace(/\s+/g, " ").trim();

103 if (finalComment.length > MAX_COMMENT_LENGTH) throw new KeyError("USERS_KEY_INVALID", "The key comment is too long.");

104 return { type, data, comment: finalComment, fingerprint: fingerprint(blob), blob: blob.toString("base64") };

105}

106

107function appendKey(content, key) {

108 const text = Buffer.isBuffer(content) ? content.toString("latin1") : String(content || "");

109 if (parseAuthorizedKeys(text).some((entry) => entry.valid && entry.blob === key.blob)) {

110 throw new KeyError("USERS_KEY_DUPLICATE", "This public key is already authorized for the account.");

111 }

112 const comment = key.comment ? ` ${Buffer.from(key.comment, "utf8").toString("latin1")}` : "";

113 const separator = text && !text.endsWith("\n") ? "\n" : "";

114 const result = Buffer.from(`${text}${separator}${key.type} ${key.data}${comment}\n`, "latin1");

115

  if (result.length > MAX_KEYS_FILE_BYTES) throw new KeyError("USERS_KEYS_FILE_TOO_LARGE", "The authorized_keys file would exceed 256 KiB.");

116 return result;

117}

118

119// Removes exactly one line, identified by line number and fingerprint, leaving all other bytes untouched.

120function removeKey(content, lineNumber, expectedFingerprint) {

121 const text = Buffer.isBuffer(content) ? content.toString("latin1") : String(content || "");

122 const lines = text.split("\n");

123 const index = Number(lineNumber) - 1;

124

  const entry = Number.isInteger(index) && index >= 0 && index < lines.length ? parseLine(lines[index], index + 1) : null;

125 if (!entry?.valid || entry.fingerprint !== expectedFingerprint) {

126 throw new KeyError("USERS_KEY_NOT_FOUND", "The selected key changed or no longer exists. Reload the key list.");

127 }

128 lines.splice(index, 1);

129 return Buffer.from(lines.join("\n"), "latin1");

130}

131

132function sha256Hex(content) {

133 return crypto.createHash("sha256").update(content).digest("hex");

134}

135

136module.exports = {

137 ADDABLE_TYPES,

138 KeyError,

139 MAX_KEYS_FILE_BYTES,

140 appendKey,

141 fingerprint,

142 normalizePublicKey,

143 parseAuthorizedKeys,

144 removeKey,

145 sha256Hex

146};

147

SHA-256

c5e2d7c0ef0c485f87af21732fb8ed2f43d55cc6d625ec129b46adefbcbffe97

CH-J Proprietary Software License 1.14 · Източникът е предоставен под CH-J Proprietary Software License 1.14. Неговата наличност не променя лицензионните условия или не предоставя допълнителни права.

Архив SHA-256

cf4455b698f0f28e456a37b1834976a0194d8486acb7101052d59a838745cca3