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1 User authentication: passwords versus alternative criteria Authentication verifying identity of a user example: logging into a system example: GPG digital signature is the authentication mechanism that user s ID gets embedded in his shell/interface process authentication!= authorization authorization establishes what user can do once authenticated 1

2 Bigger picture - how we think of it user reads file Bigger picture - how it actually works users don t read files, processes do user runs process UID reads file program that copies one file to another #include <unistd.h> #include <sys/stat.h> #include <fcntl.h> int main() { char c; int in, out; note system calls open read write They do the file access user? isn t even mentioned in the calls in = open("file.in", O_RDONLY); out = open("file.out", O_WRONLY O_CREAT, S_IRUSR S_IWUSR); while(read(in,&c,1) == 1) write(out,&c,1); exit(0); } 2

3 Bigger picture - how it actually works AUTHENTICATION HERE up front, determines account for first (shell) process same account, carried forward by inheritance from shell process to this spawned one user runs process UID reads file #include <unistd.h> #include <sys/stat.h> #include <fcntl.h> int main() { char c; int in, out; note system calls open read write They do the file access user? isn t even mentioned in the calls in = open("file.in", O_RDONLY); out = open("file.out", O_WRONLY O_CREAT, S_IRUSR S_IWUSR); while(read(in,&c,1) == 1) write(out,&c,1); exit(0); } Bases for authentication something people know password something about them retina/iris fingerprint DNA voice ear face something they have smart card sim (subscriber identity module) card hardware token somewhere they are login only works at certain terminals 3

4 Extent of authentication one or a combination of methods may be used depending on needed degree of protection single-factor multi-factor examples system login for user account, the matching password (single-factor) system with fingerprint reader (e.g. modern laptop) for user account, the matching password and finger (2-factor) ATM transaction for bank account, the card and matching pin (2-factor) PAM* architecture 1 PAM 2 /etc/pam.d 4 PAM-aware applications (e.g., /bin/login) /lib/security 3 configuration files *Pluggable Authentication Modules PAM modules 4

5 Default directories and files / /etc/pam.d /lib/security /etc/security /usr/share/doc/pam-xx individual config files for each app the PAM modules, as shared library files module-specific config files for modules that need them PAM documentation Operation sequence app calls PAM (1) PAM reads app s PAM config file (2) PAM calls PAM modules as listed in the file (3) each succeeds or fails independently PAM itself succeeds or fails, depending on the modules outcomes returns its overall outcome to app (4) app proceeds (if success) or terminates (if failure) the module that evaluates passwords can be supplemented or replaced by one(s) that evaluate biometric or hard-token input instead 5

6 Example: hardware authentication tokens Yubico YubiKey RSA SecureID Pressing yubikey,, in Notepad yubikey is a USB keyboard device it types 44 letters whenever pressed right 32 letters left 12 letters one-time password, generated this time invariant public ID of this yubikey, generated every time 6

7 Good play, bad replay from pressing keyboard from pressing yubikey ykclient utility queries validation server with key from command history recall buffer 2 seconds later (one-time key, used 2 nd time, is stale) play: red client to server blue server to client replay: 7

8 PAM for sshd: involving yubikey in ssh logins sshd 1 PAM 2 /etc/pam.d 4 a PAM-aware application 3 sshd pam_yubico.so PAM module for yubikey specifies pam_yubico.so configuration file for sshd program Configuration details corresponds this machine s david account to the particular white yubikey I bought recently, so a valid key from that yubikey device is good for admission to this account 8

9 yubikey pressed here client 1 yubikey types one-time key to client PuTTY 2 client PuTTY sends key to server sshd 3 sshd passes key to pam_yubico.so 4 pam_yubico.so ships it to api.yubico.com for validation ssh login by yubikey i n c r e a s i n g t i m e s e r v e r per yubico authentication server 5 api.yubico.com returns OK to pam_yubico.so 6 pam_yubico.so returns OK to sshd 7 sshd launches shell client Construction of output cccccccvrjbc = unique public ID s t a t i c a l l y s t o r e d B3D6 = unique secret ID = unique symmetric key (for AES) d y n a m i c a l l y g e n e r a t e d cccccccvrjbc encrypt cccccccvrjbc c o n c a t e n a t e tjjneccdnuerugkclcvenbilblgkdiie output cccccccvrjbctjjneccdnuerugkclcvenbilblgkdiie 9

10 Authentication processing application server validation request authentication server validation response app request app response public ID serial no. secret ID d a t a b a s e symmetric key last sequence number etc application client cccccccvrjbc B3D

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