KRB5_VERIFY_USER(3) | Library Functions Manual | KRB5_VERIFY_USER(3)

# NAME

krb5_verify_user, krb5_verify_user_lrealm, krb5_verify_user_opt, krb5_verify_opt_init, krb5_verify_opt_alloc, krb5_verify_opt_free, krb5_verify_opt_set_ccache, 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

#include <krb5/krb5.h>
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_alloc(krb5_verify_opt **opt);
void
krb5_verify_opt_free(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 supplied 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 ignores 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 meaningful, and should only be freed with krb5_free_principal(3).
krb5_verify_opt_alloc() and krb5_verify_opt_free() allocates and frees a `krb5_verify_opt`. You should use the the alloc and free function instead of allocation the structure yourself, this is because in a future release the structure wont be exported.
krb5_verify_opt_init() resets all opt to default values.
None of the krb5_verify_opt_set function makes a copy of the data structure that they are called with. It's 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.

# EXAMPLES

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

    #include <krb5/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_cc_gen_new(3), krb5_cc_initialize(3), krb5_cc_resolve(3), krb5_err(3), krb5_free_principal(3), krb5_init_context(3), krb5_kt_default(3), krb5.conf(5)

May 1, 2006 | NetBSD 8.2