freebsd-dev/crypto/kerberosIV/kadmin/ksrvutil_get.c
2000-01-09 08:31:47 +00:00

435 lines
12 KiB
C

/*
* Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kadm_locl.h"
#include "ksrvutil.h"
RCSID("$Id: ksrvutil_get.c,v 1.43 1999/12/02 16:58:36 joda Exp $");
#define BAD_PW 1
#define GOOD_PW 0
#define FUDGE_VALUE 15 /* for ticket expiration time */
#define PE_NO 0
#define PE_YES 1
#define PE_UNSURE 2
static char tktstring[MaxPathLen];
static int
princ_exists(char *name, char *instance, char *realm)
{
int status;
status = krb_get_pw_in_tkt(name, instance, realm,
KRB_TICKET_GRANTING_TICKET,
realm, 1, "");
if ((status == KSUCCESS) || (status == INTK_BADPW))
return(PE_YES);
else if (status == KDC_PR_UNKNOWN)
return(PE_NO);
else
return(PE_UNSURE);
}
static int
get_admin_password(char *myname, char *myinst, char *myrealm)
{
int status;
char admin_passwd[MAX_KPW_LEN]; /* Admin's password */
int ticket_life = 1; /* minimum ticket lifetime */
char buf[1024];
CREDENTIALS c;
if (princ_exists(myname, myinst, myrealm) != PE_NO) {
snprintf(buf, sizeof(buf), "Password for %s: ",
krb_unparse_name_long (myname, myinst, myrealm));
if (des_read_pw_string(admin_passwd, sizeof(admin_passwd)-1,
buf, 0)) {
fprintf(stderr, "Error reading admin password.\n");
goto bad;
}
status = krb_get_pw_in_tkt(myname, myinst, myrealm, PWSERV_NAME,
KADM_SINST, ticket_life, admin_passwd);
memset(admin_passwd, 0, sizeof(admin_passwd));
/* Initialize non shared random sequence from session key. */
memset(&c, 0, sizeof(c));
krb_get_cred(PWSERV_NAME, KADM_SINST, myrealm, &c);
des_init_random_number_generator(&c.session);
} else
status = KDC_PR_UNKNOWN;
switch(status) {
case GT_PW_OK:
return(GOOD_PW);
case KDC_PR_UNKNOWN:
printf("Principal %s does not exist.\n",
krb_unparse_name_long(myname, myinst, myrealm));
goto bad;
case GT_PW_BADPW:
printf("Incorrect admin password.\n");
goto bad;
default:
com_err("kadmin", status+krb_err_base,
"while getting password tickets");
goto bad;
}
bad:
memset(admin_passwd, 0, sizeof(admin_passwd));
dest_tkt();
return(BAD_PW);
}
static void
srvtab_put_key (int fd, char *filename, char *name, char *inst, char *realm,
int8_t kvno, des_cblock key)
{
char sname[ANAME_SZ]; /* name of service */
char sinst[INST_SZ]; /* instance of service */
char srealm[REALM_SZ]; /* realm of service */
int8_t skvno;
des_cblock skey;
lseek(fd, 0, SEEK_SET);
while(getst(fd, sname, SNAME_SZ) > 0 &&
getst(fd, sinst, INST_SZ) > 0 &&
getst(fd, srealm, REALM_SZ) > 0 &&
read(fd, &skvno, sizeof(skvno)) > 0 &&
read(fd, skey, sizeof(skey)) > 0) {
if(strcmp(name, sname) == 0 &&
strcmp(inst, sinst) == 0 &&
strcmp(realm, srealm) == 0) {
lseek(fd, lseek(fd,0,SEEK_CUR)-(sizeof(skvno) + sizeof(skey)), SEEK_SET);
safe_write(filename, fd, &kvno, sizeof(kvno));
safe_write(filename, fd, key, sizeof(des_cblock));
return;
}
}
safe_write(filename, fd, name, strlen(name) + 1);
safe_write(filename, fd, inst, strlen(inst) + 1);
safe_write(filename, fd, realm, strlen(realm) + 1);
safe_write(filename, fd, &kvno, sizeof(kvno));
safe_write(filename, fd, key, sizeof(des_cblock));
}
/*
* node list of services
*/
struct srv_ent{
char name[SNAME_SZ];
char inst[INST_SZ];
char realm[REALM_SZ];
struct srv_ent *next;
};
static int
key_to_key(const char *user,
char *instance,
const char *realm,
const void *arg,
des_cblock *key)
{
memcpy(key, arg, sizeof(des_cblock));
return 0;
}
static void
get_srvtab_ent(int unique_filename, int fd, char *filename,
char *name, char *inst, char *realm)
{
char chname[128];
des_cblock newkey;
char old_tktfile[MaxPathLen], new_tktfile[MaxPathLen];
char garbage_name[ANAME_SZ];
char garbage_inst[ANAME_SZ];
CREDENTIALS c;
u_int8_t kvno;
Kadm_vals values;
int ret;
strlcpy(chname, krb_get_phost(inst), sizeof(chname));
if(strcmp(inst, chname))
fprintf(stderr,
"Warning: Are you sure `%s' should not be `%s'?\n",
inst, chname);
memset(&values, 0, sizeof(values));
strlcpy(values.name, name, sizeof(values.name));
strlcpy(values.instance, inst, sizeof(values.instance));
des_new_random_key(&newkey);
values.key_low = (newkey[0] << 24) | (newkey[1] << 16)
| (newkey[2] << 8) | (newkey[3] << 0);
values.key_high = (newkey[4] << 24) | (newkey[5] << 16)
| (newkey[6] << 8) | (newkey[7] << 0);
SET_FIELD(KADM_NAME,values.fields);
SET_FIELD(KADM_INST,values.fields);
SET_FIELD(KADM_DESKEY,values.fields);
ret = kadm_mod(&values, &values);
if(ret == KADM_NOENTRY)
ret = kadm_add(&values);
if (ret != KSUCCESS) {
warnx ("Couldn't get srvtab entry for %s.%s: %s",
name, inst, error_message(ret));
return;
}
values.key_low = values.key_high = 0;
/* get the key version number */
{
int old = krb_use_admin_server(1);
strlcpy(old_tktfile, tkt_string(), sizeof(old_tktfile));
snprintf(new_tktfile, sizeof(new_tktfile), "%s_ksrvutil-get.%u",
TKT_ROOT, (unsigned)getpid());
krb_set_tkt_string(new_tktfile);
ret = krb_get_in_tkt(name, inst, realm, name, inst,
1, key_to_key, NULL, &newkey);
krb_use_admin_server(old);
if (ret) {
warnx ("getting tickets for %s: %s",
krb_unparse_name_long(name, inst, realm),
krb_get_err_text(ret));
return;
}
}
if (ret == KSUCCESS &&
(ret = tf_init(tkt_string(), R_TKT_FIL)) == KSUCCESS &&
(ret = tf_get_pname(garbage_name)) == KSUCCESS &&
(ret = tf_get_pinst(garbage_inst)) == KSUCCESS &&
(ret = tf_get_cred(&c)) == KSUCCESS)
kvno = c.kvno;
else {
warnx ("Could not find the cred in the ticket file: %s",
krb_get_err_text(ret));
return;
}
tf_close();
krb_set_tkt_string(old_tktfile);
unlink(new_tktfile);
if(ret != KSUCCESS) {
memset(&newkey, 0, sizeof(newkey));
warnx ("Could not get a ticket for %s: %s\n",
krb_unparse_name_long(name, inst, realm),
krb_get_err_text(ret));
return;
}
/* Write the new key & c:o to the srvtab file */
if(unique_filename){
char *fn;
asprintf(&fn, "%s-%s", filename,
krb_unparse_name_long(name, inst, realm));
if(fn == NULL){
warnx("Out of memory");
leave(NULL, 1);
}
fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, 0600); /* XXX flags, mode? */
if(fd < 0){
warn("%s", fn);
leave(NULL, 1);
}
srvtab_put_key (fd, fn, name, inst, realm, kvno, newkey);
close(fd);
fprintf (stderr, "Created %s\n", fn);
free(fn);
}else{
srvtab_put_key (fd, filename, name, inst, realm, kvno, newkey);
fprintf (stderr, "Added %s\n",
krb_unparse_name_long (name, inst, realm));
}
memset(&newkey, 0, sizeof(newkey));
}
static void
ksrvutil_kadm(int unique_filename, int fd, char *filename, struct srv_ent *p)
{
int ret;
CREDENTIALS c;
ret = kadm_init_link(PWSERV_NAME, KADM_SINST, u_realm);
if (ret != KADM_SUCCESS) {
warnx("Couldn't initialize kadmin link: %s", error_message(ret));
leave(NULL, 1);
}
ret = krb_get_cred (PWSERV_NAME, KADM_SINST, u_realm, &c);
if (ret == KSUCCESS)
des_init_random_number_generator (&c.session);
else {
umask(077);
/*
* create ticket file and get admin tickets
*/
snprintf(tktstring, sizeof(tktstring), "%s_ksrvutil_%d",
TKT_ROOT, (int)getpid());
krb_set_tkt_string(tktstring);
destroyp = TRUE;
ret = get_admin_password(u_name, u_inst, u_realm);
if (ret) {
warnx("Couldn't get admin password.");
leave(NULL, 1);
}
}
for(;p;){
get_srvtab_ent(unique_filename, fd, filename, p->name, p->inst, p->realm);
p=p->next;
}
unlink(tktstring);
}
static void
parseinput (char *result, size_t sz, char *val, char *def)
{
char *lim;
int inq;
if (val[0] == '\0') {
strlcpy (result, def, sz);
return;
}
lim = result + sz - 1;
inq = 0;
while(*val && result < lim) {
switch(*val) {
case '\'' :
inq = !inq;
++val;
break;
case '\\' :
if(!inq)
val++;
default:
*result++ = *val++;
break;
}
}
*result = '\0';
}
void
ksrvutil_get(int unique_filename, int fd, char *filename, int argc, char **argv)
{
char sname[ANAME_SZ]; /* name of service */
char sinst[INST_SZ]; /* instance of service */
char srealm[REALM_SZ]; /* realm of service */
char databuf[BUFSIZ];
char local_hostname[100];
char prompt[100];
struct srv_ent *head=NULL;
int i;
gethostname(local_hostname, sizeof(local_hostname));
strlcpy(local_hostname,
krb_get_phost(local_hostname),
sizeof(local_hostname));
if (argc)
for(i=0; i < argc; ++i) {
struct srv_ent *p=malloc(sizeof(*p));
if(p == NULL) {
warnx ("out of memory in malloc");
leave(NULL,1);
}
p->next = head;
strlcpy (p->realm, u_realm, sizeof(p->realm));
if (kname_parse (p->name, p->inst, p->realm, argv[i]) !=
KSUCCESS) {
warnx ("parse error on '%s'\n", argv[i]);
free(p);
continue;
}
if (p->name[0] == '\0')
strlcpy(p->name, "rcmd", sizeof(p->name));
if (p->inst[0] == '\0')
strlcpy(p->inst, local_hostname, sizeof(p->inst));
if (p->realm[0] == '\0')
strlcpy(p->realm, u_realm, sizeof(p->realm));
head = p;
}
else
do{
safe_read_stdin("Name [rcmd]: ", databuf, sizeof(databuf));
parseinput (sname, sizeof(sname), databuf, "rcmd");
snprintf(prompt, sizeof(prompt), "Instance [%s]: ", local_hostname);
safe_read_stdin(prompt, databuf, sizeof(databuf));
parseinput (sinst, sizeof(sinst), databuf, local_hostname);
snprintf(prompt, sizeof(prompt), "Realm [%s]: ", u_realm);
safe_read_stdin(prompt, databuf, sizeof(databuf));
parseinput (srealm, sizeof(srealm), databuf, u_realm);
if(yn("Is this correct?")){
struct srv_ent *p=(struct srv_ent*)malloc(sizeof(struct srv_ent));
if (p == NULL) {
warnx ("out of memory in malloc");
leave(NULL,1);
}
p->next=head;
head=p;
strlcpy(p->name, sname, sizeof(p->name));
strlcpy(p->inst, sinst, sizeof(p->inst));
strlcpy(p->realm, srealm, sizeof(p->realm));
}
}while(ny("Add more keys?"));
ksrvutil_kadm(unique_filename, fd, filename, head);
{
struct srv_ent *p=head, *q;
while(p){
q=p;
p=p->next;
free(q);
}
}
}