krb5_verify_user(3)

KRB5_VERIFY_USER(3)        UNIX Programmer's Manual        KRB5_VERIFY_USER(3)

NAME

     krb5_verify_user, krb5_verify_user_lrealm, krb5_verify_user_opt,
     krb5_verify_opt_init krb5_verify_opt_set_flags,
     krb5_verify_opt_set_service, krb5_verify_opt_set_secure,
     krb5_verify_opt_set_keytab - Heimdal password verifying functions.

LIBRARY

     Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

     krb5_error_code
     krb5_verify_user(krb5_context context, krb5_principal principal,
             krb5_ccache ccache, const char *password, krb5_boolean secure,
             const char *service)

     krb5_error_code
     krb5_verify_user_lrealm(krb5_context context, krb5_principal principal,
             krb5_ccache ccache, const char *password, krb5_boolean secure,
             const char *service)

     void
     krb5_verify_opt_init(krb5_verify_opt *opt)

     void
     krb5_verify_opt_set_ccache(krb5_verify_opt *opt, krb5_ccache ccache)

     void
     krb5_verify_opt_set_keytab(krb5_verify_opt *opt, krb5_keytab keytab)

     void
     krb5_verify_opt_set_secure(krb5_verify_opt *opt, krb5_boolean secure)

     void
     krb5_verify_opt_set_service(krb5_verify_opt *opt, const char *service)

     void
     krb5_verify_opt_set_flags(krb5_verify_opt *opt, unsigned int flags)

     krb5_error_code
     krb5_verify_user_opt(krb5_context context, krb5_principal principal,
             const char *password, krb5_verify_opt *opt)

DESCRIPTION

     The krb5_verify_user function verifies the password supplied by a user.
     The principal whose password will be verified is specified in principal.
     New tickets will be obtained as a side-effect and stored in ccache (if
     NULL, the default ccache is used).  krb5_verify_user() will call
     krb5_cc_initialize() on the given ccache, so ccache must only initialized
     with krb5_cc_resolve() or krb5_cc_gen_new().  If the password is not sup-
     plied in password (and is given as NULL) the user will be prompted for
     it.  If secure the ticket will be verified against the locally stored
     service key service (by default `host' if given as NULL ).

     The krb5_verify_user_lrealm function does the same, except that it ig-
     nores the realm in principal and tries all the local realms (see
     krb5.conf(5)).  After a successful return, the principal is set to the
     authenticated realm. If the call fails, the principal will not be mean-
     ingful, and should only be freed with krb5_free_principal(3).

     krb5_verify_opt_init() resets all opt to default values.

     None of the krb5_verify_opt_set function makes a copy of the data struc-
     ture that they are called with. Its up the caller to free them after the
     krb5_verify_user_opt() is called.

     krb5_verify_opt_set_ccache() sets the ccache that user of opt will use.
     If not set, the default credential cache will be used.

     krb5_verify_opt_set_keytab() sets the keytab that user of opt will use.
     If not set, the default keytab will be used.

     krb5_verify_opt_set_secure() if secure if true, the password verification
     will require that the ticket will be verified against the locally stored
     service key. If not set, default value is true.

     krb5_verify_opt_set_service() sets the service principal that user of opt
     will use. If not set, the `host' service will be used.

     krb5_verify_opt_set_flags() sets flags that user of opt will use.  If the
     flag KRB5_VERIFY_LREALMS is used, the principal will be modified like
     krb5_verify_user_lrealm() modifies it.

     krb5_verify_user_opt() function verifies the password supplied by a user.
     The principal whose password will be verified is specified in principal.
     Options the to the verification process is pass in in opt.

EXAMPLE

     Here is a example program that verifies a password. it uses the
     `host/`hostname`' service principal in krb5.keytab.

     #include <krb5.h>

     int
     main(int argc, char **argv)
     {
         char *user;
         krb5_error_code error;
         krb5_principal princ;
         krb5_context context;

         if (argc != 2)
             errx(1, "usage: verify_passwd <principal-name>");

         user = argv[1];

         if (krb5_init_context(&context) < 0)
             errx(1, "krb5_init_context");

         if ((error = krb5_parse_name(context, user, &princ)) != 0)
             krb5_err(context, 1, error, "krb5_parse_name");

         error = krb5_verify_user(context, princ, NULL, NULL, TRUE, NULL);
         if (error)
             krb5_err(context, 1, error, "krb5_verify_user");

         return 0;
     }

SEE ALSO

     krb5_err(3),  krb5_cc_gen_new(3),  krb5_cc_resolve(3),
     krb5_cc_initialize(3),  krb5_free_principal(3),  krb5_init_context(3),
     krb5_kt_default(3),  krb5.conf(5)

 HEIMDAL                        March 25, 2003                               2