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#!rsc by RouterOS
# RouterOS script: mod/ssh-keys-import
# Copyright (c) 2020-2024 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# requires RouterOS, version=7.14
#
# import ssh keys for public key authentication
# https://git.eworm.de/cgit/routeros-scripts/about/doc/mod/ssh-keys-import.md
:global SSHKeysImport;
:global SSHKeysImportFile;
# import single key passed as string
:set SSHKeysImport do={
:local Key [ :tostr $1 ];
:local User [ :tostr $2 ];
:global CharacterReplace;
:global GetRandom20CharAlNum;
:global LogPrint;
:global MkDir;
:global WaitForFile;
:if ([ :len $Key ] = 0 || [ :len $User ] = 0) do={
$LogPrint warning $0 ("Missing argument(s), please pass key and user!");
:return false;
}
:if ([ :len [ /user/find where name=$User ] ] = 0) do={
$LogPrint warning $0 ("User '" . $User . "' does not exist.");
:return false;
}
:local KeyVal [ :toarray [ $CharacterReplace $Key " " "," ] ];
:if (!($KeyVal->0 = "ssh-ed25519" || $KeyVal->0 = "ssh-rsa")) do={
$LogPrint warning $0 ("SSH key of type '" . $KeyVal->0 . "' is not supported.");
:return false;
}
:local FingerPrintMD5 [ :convert from=base64 transform=md5 to=hex ($KeyVal->1) ];
:if ([ :len [ /user/ssh-keys/find where user=$User key-owner~("\\bmd5=" . $FingerPrintMD5 . "\\b") ] ] > 0) do={
$LogPrint warning $0 ("The ssh public key (MD5:" . $FingerPrintMD5 . \
") is already available for user '" . $User . "'.");
:return false;
}
:if ([ $MkDir "tmpfs/ssh-keys-import" ] = false) do={
$LogPrint warning $0 ("Creating directory 'tmpfs/ssh-keys-import' failed!");
:return false;
}
:local FileName ("tmpfs/ssh-keys-import/key-" . [ $GetRandom20CharAlNum 6 ] . ".pub");
/file/add name=$FileName contents=($Key . ", md5=" . $FingerPrintMD5);
$WaitForFile $FileName;
:do {
/user/ssh-keys/import public-key-file=$FileName user=$User;
$LogPrint info $0 ("Imported ssh public key (" . $KeyVal->2 . ", " . $KeyVal->0 . ", " . \
"MD5:" . $FingerPrintMD5 . ") for user '" . $User . "'.");
/file/remove "tmpfs/ssh-keys-import";
} on-error={
$LogPrint warning $0 ("Failed importing key.");
/file/remove "tmpfs/ssh-keys-import";
:return false;
}
}
# import keys from a file
:set SSHKeysImportFile do={
:local FileName [ :tostr $1 ];
:local User [ :tostr $2 ];
:global EitherOr;
:global LogPrint;
:global ParseKeyValueStore;
:global SSHKeysImport;
:if ([ :len $FileName ] = 0 || [ :len $User ] = 0) do={
$LogPrint warning $0 ("Missing argument(s), please pass file name and user!");
:return false;
}
:local File [ /file/find where name=$FileName ];
:if ([ :len $File ] = 0) do={
$LogPrint warning $0 ("File '" . $FileName . "' does not exist.");
:return false;
}
:local Keys [ :tolf [ /file/get $FileName contents ] ];
:foreach KeyVal in=[ :deserialize $Keys delimiter=" " from=dsv options=dsv.plain ] do={
:local Continue false;
:if ($KeyVal->0 = "ssh-ed25519" || $KeyVal->0 = "ssh-rsa") do={
:do {
$SSHKeysImport ($KeyVal->0 . " " . $KeyVal->1 . " " . $KeyVal->2) $User;
} on-error={
$LogPrint warning $0 ("Failed importing key for user '" . $User . "'.");
}
:set Continue true;
}
:if ($Continue = false && $KeyVal->0 = "#") do={
:set User [ $EitherOr ([ $ParseKeyValueStore ($KeyVal->1) ]->"user") $User ];
:set Continue true;
}
:if ($Continue = false && [ :len ($KeyVal->0) ] > 0) do={
$LogPrint warning $0 ("SSH key of type '" . $KeyVal->0 . "' is not supported.");
}
}
}
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