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/* $OpenBSD: tcfs_keymaint.c,v 1.9 2000/06/19 23:06:25 aaron Exp $ */
/*
* Transparent Cryptographic File System (TCFS) for NetBSD
* Author and mantainer: Luigi Catuogno [luicat@tcfs.unisa.it]
*
* references: http://tcfs.dia.unisa.it
* tcfs-bsd@tcfs.unisa.it
*/
/*
* Base utility set v0.1
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/ucred.h>
#include <blf.h>
#include <ctype.h>
#include <pwd.h>
#include <string.h>
#include <unistd.h>
#include <miscfs/tcfs/tcfs.h>
#include <miscfs/tcfs/tcfs_cmd.h>
#include "tcfsdefines.h"
#include "uuencode.h"
int
tcfs_verify_fs(char *fs)
{
int ret;
struct statfs buf;
ret = statfs(fs, &buf);
if (ret)
return (0);
if (!strcmp("tcfs", buf.f_fstypename))
return (1);
else
return (0);
}
int
tcfs_callfunction(char *filesystem, struct tcfs_args *arg)
{
int i;
if (tcfs_verify_fs(filesystem))
i = mount("tcfs", filesystem, MNT_UPDATE, (void *)arg);
else
i = -1;
return (i);
}
int
tcfs_decrypt_key(char *pwd, u_char *t, u_char *tk, int tklen)
{
char pass[_PASSWORD_LEN];
char tcfskey[KEYSIZE * 2], iv[8];
blf_ctx ctx;
int len;
if (!tk)
return (0);
strlcpy(pass, pwd, sizeof(pass));
len = uudecode((char *)t, tcfskey, sizeof(tcfskey));
if (len == -1) {
fprintf(stderr, "tcfs_decrypt_key: uudecode failed\n");
return (0);
} else if (len != tklen) {
fprintf(stderr, "tcfs_decrypt_key: uudecode wrong length\n");
return (0);
}
while (strlen (pass) < 8) {
char tmp[_PASSWORD_LEN];
strcpy(tmp, pass);
strcat(tmp, pass);
strcat(pass, tmp);
}
blf_key(&ctx, pass, strlen(pass));
memset(iv, 0, sizeof(iv));
blf_cbc_decrypt(&ctx, iv, tcfskey, tklen);
memset(pass, 0, strlen(pass));
memset(&ctx, 0, sizeof(ctx));
memcpy(tk, tcfskey, tklen);
return (1);
}
int
tcfs_encrypt_key(char *pw, u_char *key, int klen, u_char *ek, int eklen)
{
char pass[_PASSWORD_LEN], iv[8];
blf_ctx ctx;
int res;
if (!ek)
return (0);
strlcpy(pass, pw, sizeof(pass));
while (strlen(pass) < 8) {
char tmp[_PASSWORD_LEN];
strcpy(tmp, pass);
strcat(tmp, pass);
strcat(pass, tmp);
}
blf_key(&ctx, pass, strlen(pass));
memset(iv, 0, sizeof(iv));
blf_cbc_encrypt(&ctx, iv, key, klen);
memset(&ctx, 0, sizeof(ctx));
res = uuencode(key, klen, ek, eklen);
if (res != eklen - 1) {
fprintf(stderr, "tcfs_encrypt_key: uuencode length wrong\n");
return (0);
}
return (1);
}
int
tcfs_user_enable(char *filesystem, uid_t user, u_char *key)
{
struct tcfs_args a;
a.user = user;
memcpy(a.tcfs_key, key, sizeof(a.tcfs_key));
a.cmd = TCFS_PUT_UIDKEY;
return (tcfs_callfunction(filesystem, &a));
}
int
tcfs_user_disable(char *filesystem, uid_t user)
{
struct tcfs_args a;
a.user = user;
a.cmd = TCFS_RM_UIDKEY;
return (tcfs_callfunction(filesystem, &a));
}
int
tcfs_proc_enable(char *filesystem, uid_t user, pid_t pid, char *key)
{
struct tcfs_args a;
a.user = user;
a.cmd = TCFS_PUT_PIDKEY;
a.proc = pid;
memcpy(a.tcfs_key, key, sizeof(a.tcfs_key));
return (tcfs_callfunction(filesystem, &a));
}
int
tcfs_proc_disable(char *filesystem, uid_t user, pid_t pid)
{
struct tcfs_args a;
a.user = user;
a.cmd = TCFS_RM_PIDKEY;
a.proc = pid;
return (tcfs_callfunction(filesystem, &a));
}
int
tcfs_group_enable(char *filesystem, uid_t uid, gid_t gid,
int tre, char *key)
{
struct tcfs_args a;
a.cmd = TCFS_PUT_GIDKEY;
a.user = uid;
a.group = gid;
a.treshold = tre;
memcpy(a.tcfs_key, key, sizeof(a.tcfs_key));
return (tcfs_callfunction(filesystem, &a));
}
int tcfs_group_disable(char *filesystem, uid_t uid, gid_t gid)
{
struct tcfs_args a;
a.cmd = TCFS_RM_GIDKEY;
a.user = uid;
a.group = gid;
return (tcfs_callfunction(filesystem, &a));
}
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