SKEYINIT(1) BSD Reference Manual SKEYINIT(1)
skeyinit - change password or add user to S/Key authentication system
skeyinit [-CDErsx] [-a auth-type] [-n count] [-md4 | -md5 | -rmd160 | -sha1] [user]
skeyinit initializes the system so you can use S/Key one-time passwords to log in. The program will ask you to enter a secret passphrase which is used by skey(1) to generate one-time passwords; enter a phrase of several words in response. After the S/Key database has been updated you can log in using either your regular password or using S/Key one-time passwords. skeyinit requires you to type a secret passphrase, so it should be used only on a secure terminal. For example, on the console of a workstation or over an encrypted network session. If you are using skeyinit while logged in over an untrusted network, follow the instructions given below with the -s option. Before initializing an S/Key entry, the user must authenticate using ei- ther a standard password or an S/Key challenge. To use a one-time pass- word for initial authentication, the "-a skey" option can be used. The user will then be presented with the standard S/Key challenge and allowed to proceed if it is correct. skeyinit prints a sequence number and a one-time password. This password can't be used to log in; one-time passwords should be generated using skey(1) first. The one-time password printed by skeyinit can be used to verify if the right passphrase has been given to skey(1). The one-time password with the corresponding sequence number printed by skey(1) should match the one printed by skeyinit. The options are as follows: -a auth-type Specify an authentication type such as "krb5", "passwd", or "skey". -C Converts from the old-style /etc/skeykeys database to a new-style database where user records are stored in the /etc/skey directo- ry. If an entry already exists in the new-style database it will not be overwritten. -D Disables access to the S/Key database. Only the superuser may use the -D option. -E Enables access to the S/Key database. Only the superuser may use the -E option. -md4 | -md5 | -rmd160 | -sha1 Selects the hash algorithm: MD4, MD5, RMD-160 (160-bit Ripe Mes- sage Digest), or SHA1 (NIST Secure Hash Algorithm Revision 1). -n count Start the skey sequence at count (default is 100). -r Removes the user's S/Key entry. -s Set secure mode where the user is expected to have used a secure machine to generate the first one-time password. Without the -s option the system will assume you are directly connected over secure communications and prompt you for your secret passphrase. The -s option also allows one to set the seed and count for com- plete control of the parameters. You can use skeyinit -s in com- bination with the skey command to set the seed and count if you do not like the defaults. To do this run skeyinit in one window and put in your count and seed, then run skey in another window to generate the correct 6 English words for that count and seed. You can then "cut-and-paste" or type the words into the skeyinit window. When the -s option is specified, skeyinit will try to au- thenticate the user via S/Key, instead of the default listed in /etc/login.conf. If a user has no entry in the S/Key database, an alternate authentication type must be specified via the -a op- tion. Please note that entering a password or passphrase in plain text defeats the purpose of using "secure" mode. -x Displays one-time passwords in hexadecimal instead of ASCII. user The username to be changed/added. By default the current user is operated on.
/etc/login.conf file containing authentication types /etc/skey directory containing user entries for S/Key
$ skeyinit Reminder - Only use this method if you are directly connected or have an encrypted channel. If you are using telnet, hit return now and use skeyinit -s. Password: <enter your regular password here> [Updating user with md5] Old seed: [md5] host12377 Enter new secret passphrase: <type a new passphrase here> Again secret passphrase: <again> ID user skey is otp-md5 100 host12378 Next login password: CITE BREW IDLE CAIN ROD DOME $ otp-md5 -n 3 100 host12378 Reminder - Do not use this program while logged in via telnet. Enter secret passphrase: <type your passphrase here> 98: WERE TUG EDDY GEAR GILL TEE 99: NEAR HA TILT FIN LONG SNOW 100: CITE BREW IDLE CAIN ROD DOME The one-time password for the next login will have sequence number 99.
skey disabled /etc/skey does not exist or is not accessible by the user. The superuser may enable skeyinit via the -E flag.
skey(1), skeyaudit(1), skeyinfo(1), skey(5), skeyprune(8)
Phil Karn, Neil M. Haller, John S. Walden, Scott Chasin, Todd Miller MirOS BSD #10-current February 24, 1998 1
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