otp-control 1 otp-control Local user database configuration for One Time Password package. otp-control -?hnv -c count -C count_ceil -f format -F flags -H sc_hostname -I sc_index -k key -m command_mode -o otpdb_pathname -s status -S sc_flags -t type -u username -w window The otp-control command is a front end to the local One Time Password database. Users can be added, modified and removed by otp-control. -c count User count. The count increases with each OTP transaction. -C count_ceil User count ceiling. Highest count allowed for this user. Configuring the count_ceiling allows a user key to be shared among multiple systems each with a unique count window, where count <= count_ceiling. A count value must only be allowed for authentication once. Example: host=h1, user=bob, count_current=0, count_ceil=10000. host=h2, user=bob, count_current=10001, count_ceil=20000. The number of keys a user must possess is decreased at the expense of security dependencies among multiple systems. If system A is compromised, OTP's can be generated for the user(s) on system B from the shared keys on system A. To generate an OTP out of sequence the count must be presented to the OTP generator. The additional step of entering the count to the OTP generator is not necessary when keys are not shared, as the currrent count will increase on the OTP generator and system database during authentication. -f OTP format. One of hex40 dhex40 dec31.6 dec31.7 dec31.8 dec31.9 dec31.10. hex40 (40 bit hex) is the default. dec31.6 (31 bit decimal truncated to 6 digits) is suggested by RFC 4226 and may be required to interoperate with other HOTP implementations. dhex40 uses the dynamic truncate function in RFC 4226, where hex40 always uses the top 40 bits. dhex40 may be the default in future releases. -F OTP flags. All flags are unset by default. Flag Description ----------------------------------------------------------------- display-count : Display HOTP count when prompted for challenge. -h Help. -H sc_hostname Set the SC hostname with the list-sc command mode. -I sc_index Set the SC index with the list-sc command mode. -k key 160 bit shared secret key in ASCII HEX. The secret key is shared between the OTP generation hardware/software for a user and the local OTP database. Each user typically will have a unique key unless a shared key with unique count space is provisioned. Use - for stdin. Example key: C0C3D47F1CC68ECE0DF81D008F0C0D72D43EB745 -m command_mode Mode Description ------------------------------------------------- add - Add user create - Create database dump - ASCII dump user record(s) generate - Generate HOTP for user list - List user record (printable) list-sc - List user record (SC friendly) load - ASCII load user record(s) remove - Remove user set-count - Set user count set-count-ceil - Set user count ceiling set-flags - Set user flags set-format - Set user format set-status - Set user status set-type - Set user OTP type test - Test user -n Create new database if one does not exist. -o otp_pathname Pathname of OTP database. -s otp_pathname OTP Status. The default status is active. Status Description ----------------------------------------------------------------- active : OTP is required for succesful authentication. inactive : OTP may not be required for successful authentication. The OTP authentication module may be configured to allow inactive accounts to authenticate. This may be used to temporarily remove the OTP authentication method for a user. disabled : Account is disabled. OTP authentication will fail. -S sc_flags Set the SC flags with the list-sc command mode. 0=CHALLENGE, 1=READERKEY. -t type OTP Type. RFC 4226 HOTP is only supported type. -u username Username to perform database operation on. -v Enable verbose output (debugging). -w window Set the maximum window (count above the system count) where an OTP will successfully authenticate. For user bob with with OTP generator count_current=30, and system OTP database for bob count_current 15, the default window (10) will not allow the user to authenticate, even though the OTP is computed with a valid shared key. This can be caused by the user repeatedly generating an OTP which is not used for authentication. When generating an OTP (mode generate) the window will configure the number of tokens generated. add : add user to OTP database. count_cur and count_ceiling may optionally be specified with -c and -C respectively. A random key will be generated if no key is specified with -k. The format, flags, status, and type may be altered from the defaults with -f, -F, -s, and -t respectively. create : create OTP database. The OTP database is a base directory with each user stored in a separate ASCII : delimited file in base_dir/d. dump : dump user database in ASCII. User records are separated by a newline. Fields are : separated. All fields except the username are HEX encoded. #version:user:key:status:format:type:flags:count_cur:count_ceil:last 01:test:1111111111111111111111111111111111111111:01:01:01:00:00000000000003E8:00000000000007D0:0000000000000000 generate : generate OTP for user. The -w flag may be used to generate multiple OTP tokens. list : list user record in user friendly format. list-sc : list user record in otp-sc import friendly format. The SC hostname must be specified with -H. The SC index and SC flags may optionally be specified with -I and -F. load : load user record(s)s in ASCII format. See dump. remove : remove user from OTP database. set-count : set count_current for user. set-count-ceil : set count_ceiling for user. A OTP will not authenticate when count_cur >= count_cieiling. set-flags : set flags for user. See option -F. set-format : set format for user. See option -f. set-status : set status for user. See option -s. set-type : set status for user. See option -t. test : test OTP authentication for user. Create a new OTP database /etc/otpdb. Add user bob with random key. otp-control -n -f /etc/otpdb -u bob -m add Generating random 160 bit key. Adding user bob. Display user bob OTP database entry. otp-control -u bob -m list Username.......bob Key............C381739834A63A67B0B9F7F7D36C8C567F6BFB3D Count..........0 (0x0) Count Ceiling..18446744073709551615 (0xFFFFFFFFFFFFFFFF) Version........1 Status.........active (1) Format.........hex40 (1) Type...........HOTP (1) Flags..........[] (0x00) Generate OTP for user bob. otp-control -u bob -m generate count=0 crsp=882B0E8410 Test OTP for user bob. otp-control -u bob -m test Testing authentication for user bob. OTP challenge for user bob (0): 882B0E8410 Success. Dump OTP database to stdout. Fields other than username are hex encoded. Use the load command to import records in this format. otp-control -m dump #version:user:key:status:format:type:flags:count_cur:count_ceil:last 01:bob:C381739834A63A67B0B9F7F7D36C8C567F6BFB3D:01:01:01:00:0000000000000001:FFFFFFFFFFFFFFFF:000000004AA02F9E Dump OTP user to stdout in format friendly to otp-sca. Note the hostname must be set with -H. The index will default to 0 if not specified with -I. SC flags may be set with -F. otp-control -u test -m list-sc -H dev1 #index:count:hostname:key 00:000003E8:646576310000000000000000:1111111111111111111111111111111111111111 Mark Fullmer maf@splintered.net otp-sca(1) otp-sct(1) pam_otp(1) htsoft-downloader(1) otp-ov-plugin(1) urd(1) bcload(1) spyrus-par2(7)