KRB5_VERIFY_USER(3)

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 9.5