diff options
Diffstat (limited to 'sunrpc/key_call.c')
| -rw-r--r-- | sunrpc/key_call.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/sunrpc/key_call.c b/sunrpc/key_call.c new file mode 100644 index 0000000000..ba1c2638fb --- /dev/null +++ b/sunrpc/key_call.c @@ -0,0 +1,363 @@ +/* + * Copyright (c) 1988 by Sun Microsystems, Inc. + */ +/* + * Sun RPC is a product of Sun Microsystems, Inc. and is provided for + * unrestricted use provided that this legend is included on all tape + * media and as a part of the software program in whole or part. Users + * may copy or modify Sun RPC without charge, but are not authorized + * to license or distribute it to anyone else except as part of a product or + * program developed by the user. + * + * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE + * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR + * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. + * + * Sun RPC is provided with no support and without any obligation on the + * part of Sun Microsystems, Inc. to assist in its use, correction, + * modification or enhancement. + * + * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE + * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC + * OR ANY PART THEREOF. + * + * In no event will Sun Microsystems, Inc. be liable for any lost revenue + * or profits or other special, indirect and consequential damages, even if + * Sun has been advised of the possibility of such damages. + * + * Sun Microsystems, Inc. + * 2550 Garcia Avenue + * Mountain View, California 94043 + */ + +/* + * The original source is from the RPCSRC 4.0 package from Sun Microsystems. + * The Interface to keyserver protocoll 2 was added by + * Thorsten Kukuk <kukuk@vt.uni-paderborn.de> + */ + +#include <stdio.h> +#include <signal.h> +#include <unistd.h> +#include <string.h> +#include <rpc/rpc.h> +#include <rpc/auth.h> +#include <sys/wait.h> +#include <sys/param.h> +#include <sys/socket.h> +#include <rpc/key_prot.h> + +#define KEY_TIMEOUT 5 /* per-try timeout in seconds */ +#define KEY_NRETRY 12 /* number of retries */ + +#define debug(msg) /* turn off debugging */ + +extern int _openchild (char *command, FILE ** fto, FILE ** ffrom); + + +static int key_call (u_long, xdrproc_t xdr_arg, char *, + xdrproc_t xdr_rslt, char *); + +static struct timeval trytimeout = {KEY_TIMEOUT, 0}; +static struct timeval tottimeout = {KEY_TIMEOUT * KEY_NRETRY, 0}; + +int +key_setsecret (char *secretkey) +{ + keystatus status; + + if (!key_call ((u_long) KEY_SET, (xdrproc_t) xdr_keybuf, secretkey, + (xdrproc_t) xdr_keystatus, (char *) &status)) + return -1; + if (status != KEY_SUCCESS) + { + debug ("set status is nonzero"); + return -1; + } + return 0; +} + +/* key_secretkey_is_set() returns 1 if the keyserver has a secret key + * stored for the caller's effective uid; it returns 0 otherwise + * + * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't + * be using it, because it allows them to get the user's secret key. + */ +int +key_secretkey_is_set (void) +{ + struct key_netstres kres; + + memset (&kres, 0, sizeof (kres)); + if (key_call ((u_long) KEY_NET_GET, (xdrproc_t) xdr_void, (char *) NULL, + (xdrproc_t) xdr_key_netstres, (char *) &kres) && + (kres.status == KEY_SUCCESS) && + (kres.key_netstres_u.knet.st_priv_key[0] != 0)) + { + /* avoid leaving secret key in memory */ + memset (kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES); + return 1; + } + return 0; +} + +int +key_encryptsession (char *remotename, des_block * deskey) +{ + cryptkeyarg arg; + cryptkeyres res; + + arg.remotename = remotename; + arg.deskey = *deskey; + if (!key_call ((u_long) KEY_ENCRYPT, (xdrproc_t) xdr_cryptkeyarg, + (char *) &arg, (xdrproc_t) xdr_cryptkeyres, (char *) &res)) + return -1; + + if (res.status != KEY_SUCCESS) + { + debug ("encrypt status is nonzero"); + return -1; + } + *deskey = res.cryptkeyres_u.deskey; + return 0; +} + +int +key_decryptsession (char *remotename, des_block * deskey) +{ + cryptkeyarg arg; + cryptkeyres res; + + arg.remotename = remotename; + arg.deskey = *deskey; + if (!key_call ((u_long) KEY_DECRYPT, (xdrproc_t) xdr_cryptkeyarg, + (char *) &arg, (xdrproc_t) xdr_cryptkeyres, (char *) &res)) + return -1; + if (res.status != KEY_SUCCESS) + { + debug ("decrypt status is nonzero"); + return -1; + } + *deskey = res.cryptkeyres_u.deskey; + return 0; +} + +int +key_encryptsession_pk (char *remotename, netobj * remotekey, + des_block * deskey) +{ + cryptkeyarg2 arg; + cryptkeyres res; + + arg.remotename = remotename; + arg.remotekey = *remotekey; + arg.deskey = *deskey; + if (!key_call ((u_long) KEY_ENCRYPT_PK, (xdrproc_t) xdr_cryptkeyarg2, + (char *) &arg, (xdrproc_t) xdr_cryptkeyres, (char *) &res)) + return -1; + + if (res.status != KEY_SUCCESS) + { + debug ("encrypt status is nonzero"); + return -1; + } + *deskey = res.cryptkeyres_u.deskey; + return 0; +} + +int +key_decryptsession_pk (char *remotename, netobj * remotekey, + des_block * deskey) +{ + cryptkeyarg2 arg; + cryptkeyres res; + + arg.remotename = remotename; + arg.remotekey = *remotekey; + arg.deskey = *deskey; + if (!key_call ((u_long) KEY_DECRYPT_PK, (xdrproc_t) xdr_cryptkeyarg2, + (char *) &arg, (xdrproc_t) xdr_cryptkeyres, (char *) &res)) + return -1; + + if (res.status != KEY_SUCCESS) + { + debug ("decrypt status is nonzero"); + return -1; + } + *deskey = res.cryptkeyres_u.deskey; + return 0; +} + +int +key_gendes (des_block * key) +{ + struct sockaddr_in sin; + CLIENT *client; + int socket; + enum clnt_stat stat; + + sin.sin_family = AF_INET; + sin.sin_port = 0; + sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK); + bzero (sin.sin_zero, sizeof (sin.sin_zero)); + socket = RPC_ANYSOCK; + client = clntudp_bufcreate (&sin, (u_long) KEY_PROG, (u_long) KEY_VERS, + trytimeout, &socket, RPCSMALLMSGSIZE, + RPCSMALLMSGSIZE); + if (client == NULL) + return -1; + + stat = clnt_call (client, KEY_GEN, (xdrproc_t) xdr_void, NULL, + (xdrproc_t) xdr_des_block, (caddr_t) key, tottimeout); + clnt_destroy (client); + close (socket); + if (stat != RPC_SUCCESS) + return -1; + + return 0; +} + +int +key_setnet (struct key_netstarg *arg) +{ + keystatus status; + + if (!key_call ((u_long) KEY_NET_PUT, (xdrproc_t) xdr_key_netstarg, + (char *) arg,(xdrproc_t) xdr_keystatus, (char *) &status)) + return -1; + + if (status != KEY_SUCCESS) + { + debug ("key_setnet status is nonzero"); + return -1; + } + return 1; +} + +int +key_get_conv (char *pkey, des_block * deskey) +{ + cryptkeyres res; + + if (!key_call ((u_long) KEY_GET_CONV, (xdrproc_t) xdr_keybuf, pkey, + (xdrproc_t) xdr_cryptkeyres, (char *) &res)) + return -1; + + if (res.status != KEY_SUCCESS) + { + debug ("get_conv status is nonzero"); + return -1; + } + *deskey = res.cryptkeyres_u.deskey; + return 0; +} + +/* + * Hack to allow the keyserver to use AUTH_DES (for authenticated + * NIS+ calls, for example). The only functions that get called + * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes. + * + * The approach is to have the keyserver fill in pointers to local + * implementations of these functions, and to call those in key_call(). + */ + +cryptkeyres *(*__key_encryptsession_pk_LOCAL) (uid_t, char *) = 0; +cryptkeyres *(*__key_decryptsession_pk_LOCAL) (uid_t, char *) = 0; +des_block *(*__key_gendes_LOCAL) (uid_t, char *) = 0; + +static int +key_call (u_long proc, xdrproc_t xdr_arg, char *arg, + xdrproc_t xdr_rslt, char *rslt) +{ + XDR xdrargs; + XDR xdrrslt; + FILE *fargs; + FILE *frslt; + void (*osigchild) (int); + union wait status; + int pid; + int success; + uid_t ruid; + uid_t euid; + static char MESSENGER[] = "/usr/etc/keyenvoy"; + + success = 1; + osigchild = signal (SIGCHLD, SIG_IGN); + + if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) + { + cryptkeyres *res; + res = (*__key_encryptsession_pk_LOCAL) (geteuid (), arg); + *(cryptkeyres *) rslt = *res; + return 1; + } + else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) + { + cryptkeyres *res; + res = (*__key_decryptsession_pk_LOCAL) (geteuid (), arg); + *(cryptkeyres *) rslt = *res; + return 1; + } + else if (proc == KEY_GEN && __key_gendes_LOCAL) + { + des_block *res; + res = (*__key_gendes_LOCAL) (geteuid (), 0); + *(des_block *) rslt = *res; + return 1; + } + + /* + * We are going to exec a set-uid program which makes our effective uid + * zero, and authenticates us with our real uid. We need to make the + * effective uid be the real uid for the setuid program, and + * the real uid be the effective uid so that we can change things back. + */ + euid = geteuid (); + ruid = getuid (); + setreuid (euid, ruid); + pid = _openchild (MESSENGER, &fargs, &frslt); + setreuid (ruid, euid); + if (pid < 0) + { + debug ("open_streams"); + return (0); + } + xdrstdio_create (&xdrargs, fargs, XDR_ENCODE); + xdrstdio_create (&xdrrslt, frslt, XDR_DECODE); + + if (!xdr_u_long (&xdrargs, &proc) || !(*xdr_arg) (&xdrargs, arg)) + { + debug ("xdr args"); + success = 0; + } + fclose (fargs); + + if (success && !(*xdr_rslt) (&xdrrslt, rslt)) + { + debug ("xdr rslt"); + success = 0; + } + +#ifdef NOTDEF + /* + * WARNING! XXX + * The original code appears first. wait4 returns only after the process + * with the requested pid terminates. The effect of using wait() instead + * has not been determined. + */ + fclose (frslt); + if (wait4 (pid, &status, 0, NULL) < 0 || status.w_retcode != 0) + { + debug ("wait4"); + success = 0; + } +#endif /* def NOTDEF */ + if (wait (&status) < 0 || status.w_retcode != 0) + { + debug ("wait"); + success = 0; + } + signal (SIGCHLD, osigchild); + + return (success); +} |