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/*
* Copyright (c) 1989 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#include <popper.h>
RCSID("$Id: pop_pass.c,v 1.41 2000/04/12 15:37:46 assar Exp $");
#ifdef KRB4
static int
krb4_verify_password (POP *p)
{
int status;
char lrealm[REALM_SZ];
char tkt[MaxPathLen];
status = krb_get_lrealm(lrealm,1);
if (status == KFAILURE) {
pop_log(p, POP_PRIORITY, "%s: (%s.%s@%s) %s", p->client,
p->kdata.pname, p->kdata.pinst, p->kdata.prealm,
krb_get_err_text(status));
return 1;
}
snprintf(tkt, sizeof(tkt), "%s_popper.%u", TKT_ROOT, (unsigned)getpid());
krb_set_tkt_string (tkt);
status = krb_verify_user(p->user, "", lrealm,
p->pop_parm[1], KRB_VERIFY_SECURE, "pop");
dest_tkt(); /* no point in keeping the tickets */
return status;
}
#endif /* KRB4 */
#ifdef KRB5
static int
krb5_verify_password (POP *p)
{
krb5_preauthtype pre_auth_types[] = {KRB5_PADATA_ENC_TIMESTAMP};
krb5_get_init_creds_opt get_options;
krb5_verify_init_creds_opt verify_options;
krb5_error_code ret;
krb5_principal client, server;
krb5_creds creds;
krb5_get_init_creds_opt_init (&get_options);
krb5_get_init_creds_opt_set_preauth_list (&get_options,
pre_auth_types,
1);
krb5_verify_init_creds_opt_init (&verify_options);
ret = krb5_parse_name (p->context, p->user, &client);
if (ret) {
pop_log(p, POP_PRIORITY, "krb5_parse_name: %s",
krb5_get_err_text (p->context, ret));
return 1;
}
ret = krb5_get_init_creds_password (p->context,
&creds,
client,
p->pop_parm[1],
NULL,
NULL,
0,
NULL,
&get_options);
if (ret) {
pop_log(p, POP_PRIORITY,
"krb5_get_init_creds_password: %s",
krb5_get_err_text (p->context, ret));
return 1;
}
ret = krb5_sname_to_principal (p->context,
p->myhost,
"pop",
KRB5_NT_SRV_HST,
&server);
if (ret) {
pop_log(p, POP_PRIORITY,
"krb5_get_init_creds_password: %s",
krb5_get_err_text (p->context, ret));
return 1;
}
ret = krb5_verify_init_creds (p->context,
&creds,
server,
NULL,
NULL,
&verify_options);
krb5_free_principal (p->context, client);
krb5_free_principal (p->context, server);
krb5_free_creds_contents (p->context, &creds);
return ret;
}
#endif
/*
* pass: Obtain the user password from a POP client
*/
int
pop_pass (POP *p)
{
struct passwd *pw;
int i;
struct stat st;
/* Make one string of all these parameters */
for (i = 1; i < p->parm_count; ++i)
p->pop_parm[i][strlen(p->pop_parm[i])] = ' ';
/* Look for the user in the password file */
if ((pw = k_getpwnam(p->user)) == NULL)
return (pop_msg(p,POP_FAILURE,
"Password supplied for \"%s\" is incorrect.",
p->user));
if (p->kerberosp) {
#ifdef KRB4
if (p->version == 4) {
if(kuserok (&p->kdata, p->user)) {
pop_log(p, POP_PRIORITY,
"%s: (%s.%s@%s) tried to retrieve mail for %s.",
p->client, p->kdata.pname, p->kdata.pinst,
p->kdata.prealm, p->user);
return(pop_msg(p,POP_FAILURE,
"Popping not authorized"));
}
pop_log(p, POP_INFO, "%s: %s.%s@%s -> %s",
p->ipaddr,
p->kdata.pname, p->kdata.pinst, p->kdata.prealm,
p->user);
} else
#endif /* KRB4 */
#ifdef KRB5
if (p->version == 5) {
char *name;
if (!krb5_kuserok (p->context, p->principal, p->user)) {
pop_log (p, POP_PRIORITY,
"krb5 permission denied");
return pop_msg(p, POP_FAILURE,
"Popping not authorized");
}
if(krb5_unparse_name (p->context, p->principal, &name) == 0) {
pop_log(p, POP_INFO, "%s: %s -> %s",
p->ipaddr, name, p->user);
free (name);
}
} else {
pop_log (p, POP_PRIORITY, "kerberos authentication failed");
return pop_msg (p, POP_FAILURE,
"kerberos authentication failed");
}
#endif
{ }
} else {
/* We don't accept connections from users with null passwords */
if (pw->pw_passwd == NULL)
return (pop_msg(p,
POP_FAILURE,
"Password supplied for \"%s\" is incorrect.",
p->user));
#ifdef OTP
if (otp_verify_user (&p->otp_ctx, p->pop_parm[1]) == 0)
/* pass OK */;
else
#endif
/* Compare the supplied password with the password file entry */
if (p->auth_level != AUTH_NONE)
return pop_msg(p, POP_FAILURE,
"Password supplied for \"%s\" is incorrect.",
p->user);
else if (!strcmp(crypt(p->pop_parm[1], pw->pw_passwd), pw->pw_passwd))
/* pass OK */;
else {
int ret = -1;
#ifdef KRB4
ret = krb4_verify_password (p);
#endif
#ifdef KRB5
if(ret)
ret = krb5_verify_password (p);
#endif
if(ret)
return pop_msg(p, POP_FAILURE,
"Password incorrect");
}
}
pop_log(p, POP_INFO, "login from %s as %s",
p->ipaddr, p->user);
/* Build the name of the user's maildrop */
snprintf(p->drop_name, sizeof(p->drop_name), "%s/%s", POP_MAILDIR, p->user);
if(stat(p->drop_name, &st) < 0 || !S_ISDIR(st.st_mode)){
/* Make a temporary copy of the user's maildrop */
/* and set the group and user id */
if (pop_dropcopy(p, pw) != POP_SUCCESS) return (POP_FAILURE);
/* Get information about the maildrop */
if (pop_dropinfo(p) != POP_SUCCESS) return(POP_FAILURE);
} else {
if(changeuser(p, pw) != POP_SUCCESS) return POP_FAILURE;
if(pop_maildir_info(p) != POP_SUCCESS) return POP_FAILURE;
}
/* Initialize the last-message-accessed number */
p->last_msg = 0;
/* Authorization completed successfully */
return (pop_msg (p, POP_SUCCESS,
"%s has %d message(s) (%ld octets).",
p->user, p->msg_count, p->drop_size));
}
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