diff options
Diffstat (limited to 'source3/client/cifs.upcall.c')
| -rw-r--r-- | source3/client/cifs.upcall.c | 391 |
1 files changed, 0 insertions, 391 deletions
diff --git a/source3/client/cifs.upcall.c b/source3/client/cifs.upcall.c deleted file mode 100644 index 4110de35fd..0000000000 --- a/source3/client/cifs.upcall.c +++ /dev/null @@ -1,391 +0,0 @@ -/* -* CIFS user-space helper. -* Copyright (C) Igor Mammedov (niallain@gmail.com) 2007 -* -* Used by /sbin/request-key for handling -* cifs upcall for kerberos authorization of access to share and -* cifs upcall for DFS srver name resolving (IPv4/IPv6 aware). -* You should have keyutils installed and add something like the -* following lines to /etc/request-key.conf file: - -create cifs.spnego * * /usr/local/sbin/cifs.upcall %k -create dns_resolver * * /usr/local/sbin/cifs.upcall %k - -* This program is free software; you can redistribute it and/or modify -* it under the terms of the GNU General Public License as published by -* the Free Software Foundation; either version 2 of the License, or -* (at your option) any later version. -* This program is distributed in the hope that it will be useful, -* but WITHOUT ANY WARRANTY; without even the implied warranty of -* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -* GNU General Public License for more details. -* You should have received a copy of the GNU General Public License -* along with this program; if not, write to the Free Software -* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -*/ - -#include "includes.h" -#include <keyutils.h> - -#include "cifs_spnego.h" - -const char *CIFSSPNEGO_VERSION = "1.2"; -static const char *prog = "cifs.upcall"; -typedef enum _secType { - NONE = 0, - KRB5, - MS_KRB5 -} secType_t; - -/* - * Prepares AP-REQ data for mechToken and gets session key - * Uses credentials from cache. It will not ask for password - * you should receive credentials for yuor name manually using - * kinit or whatever you wish. - * - * in: - * oid - string with OID/ Could be OID_KERBEROS5 - * or OID_KERBEROS5_OLD - * principal - Service name. - * Could be "cifs/FQDN" for KRB5 OID - * or for MS_KRB5 OID style server principal - * like "pdc$@YOUR.REALM.NAME" - * - * out: - * secblob - pointer for spnego wrapped AP-REQ data to be stored - * sess_key- pointer for SessionKey data to be stored - * - * ret: 0 - success, others - failure -*/ -static int -handle_krb5_mech(const char *oid, const char *principal, - DATA_BLOB * secblob, DATA_BLOB * sess_key) -{ - int retval; - DATA_BLOB tkt, tkt_wrapped; - - /* get a kerberos ticket for the service and extract the session key */ - retval = cli_krb5_get_ticket(principal, 0, - &tkt, sess_key, 0, NULL, NULL); - - if (retval) - return retval; - - /* wrap that up in a nice GSS-API wrapping */ - tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ); - - /* and wrap that in a shiny SPNEGO wrapper */ - *secblob = gen_negTokenInit(oid, tkt_wrapped); - - data_blob_free(&tkt_wrapped); - data_blob_free(&tkt); - return retval; -} - -#define DKD_HAVE_HOSTNAME 1 -#define DKD_HAVE_VERSION 2 -#define DKD_HAVE_SEC 4 -#define DKD_HAVE_IPV4 8 -#define DKD_HAVE_IPV6 16 -#define DKD_HAVE_UID 32 -#define DKD_MUSTHAVE_SET (DKD_HAVE_HOSTNAME|DKD_HAVE_VERSION|DKD_HAVE_SEC) - -static int -decode_key_description(const char *desc, int *ver, secType_t * sec, - char **hostname, uid_t * uid) -{ - int retval = 0; - char *pos; - const char *tkn = desc; - - do { - pos = index(tkn, ';'); - if (strncmp(tkn, "host=", 5) == 0) { - int len; - - if (pos == NULL) { - len = strlen(tkn); - } else { - len = pos - tkn; - } - len -= 4; - SAFE_FREE(*hostname); - *hostname = SMB_XMALLOC_ARRAY(char, len); - strlcpy(*hostname, tkn + 5, len); - retval |= DKD_HAVE_HOSTNAME; - } else if (strncmp(tkn, "ipv4=", 5) == 0) { - /* BB: do we need it if we have hostname already? */ - } else if (strncmp(tkn, "ipv6=", 5) == 0) { - /* BB: do we need it if we have hostname already? */ - } else if (strncmp(tkn, "sec=", 4) == 0) { - if (strncmp(tkn + 4, "krb5", 4) == 0) { - retval |= DKD_HAVE_SEC; - *sec = KRB5; - } else if (strncmp(tkn + 4, "mskrb5", 6) == 0) { - retval |= DKD_HAVE_SEC; - *sec = MS_KRB5; - } - } else if (strncmp(tkn, "uid=", 4) == 0) { - errno = 0; - *uid = strtol(tkn + 4, NULL, 16); - if (errno != 0) { - syslog(LOG_WARNING, "Invalid uid format: %s", - strerror(errno)); - return 1; - } else { - retval |= DKD_HAVE_UID; - } - } else if (strncmp(tkn, "ver=", 4) == 0) { /* if version */ - errno = 0; - *ver = strtol(tkn + 4, NULL, 16); - if (errno != 0) { - syslog(LOG_WARNING, - "Invalid version format: %s", - strerror(errno)); - return 1; - } else { - retval |= DKD_HAVE_VERSION; - } - } - if (pos == NULL) - break; - tkn = pos + 1; - } while (tkn); - return retval; -} - -static int -cifs_resolver(const key_serial_t key, const char *key_descr) -{ - int c; - struct addrinfo *addr; - char ip[INET6_ADDRSTRLEN]; - void *p; - const char *keyend = key_descr; - /* skip next 4 ';' delimiters to get to description */ - for (c = 1; c <= 4; c++) { - keyend = index(keyend+1, ';'); - if (!keyend) { - syslog(LOG_WARNING, "invalid key description: %s", - key_descr); - return 1; - } - } - keyend++; - - /* resolve name to ip */ - c = getaddrinfo(keyend, NULL, NULL, &addr); - if (c) { - syslog(LOG_WARNING, "unable to resolve hostname: %s [%s]", - keyend, gai_strerror(c)); - return 1; - } - - /* conver ip to string form */ - if (addr->ai_family == AF_INET) { - p = &(((struct sockaddr_in *)addr->ai_addr)->sin_addr); - } else { - p = &(((struct sockaddr_in6 *)addr->ai_addr)->sin6_addr); - } - if (!inet_ntop(addr->ai_family, p, ip, sizeof(ip))) { - syslog(LOG_WARNING, "%s: inet_ntop: %s", - __FUNCTION__, strerror(errno)); - freeaddrinfo(addr); - return 1; - } - - /* setup key */ - c = keyctl_instantiate(key, ip, strlen(ip)+1, 0); - if (c == -1) { - syslog(LOG_WARNING, "%s: keyctl_instantiate: %s", - __FUNCTION__, strerror(errno)); - freeaddrinfo(addr); - return 1; - } - - freeaddrinfo(addr); - return 0; -} - -static void -usage(void) -{ - syslog(LOG_WARNING, "Usage: %s [-c] [-v] key_serial", prog); - fprintf(stderr, "Usage: %s [-c] [-v] key_serial\n", prog); -} - -int main(const int argc, char *const argv[]) -{ - struct cifs_spnego_msg *keydata = NULL; - DATA_BLOB secblob = data_blob_null; - DATA_BLOB sess_key = data_blob_null; - secType_t sectype = NONE; - key_serial_t key = 0; - size_t datalen; - long rc = 1; - uid_t uid = 0; - int kernel_upcall_version = 0; - int c, use_cifs_service_prefix = 0; - char *buf, *hostname = NULL; - const char *oid; - - openlog(prog, 0, LOG_DAEMON); - - while ((c = getopt(argc, argv, "cv")) != -1) { - switch (c) { - case 'c':{ - use_cifs_service_prefix = 1; - break; - } - case 'v':{ - printf("version: %s\n", CIFSSPNEGO_VERSION); - goto out; - } - default:{ - syslog(LOG_WARNING, "unknown option: %c", c); - goto out; - } - } - } - - /* is there a key? */ - if (argc <= optind) { - usage(); - goto out; - } - - /* get key and keyring values */ - errno = 0; - key = strtol(argv[optind], NULL, 10); - if (errno != 0) { - key = 0; - syslog(LOG_WARNING, "Invalid key format: %s", strerror(errno)); - goto out; - } - - rc = keyctl_describe_alloc(key, &buf); - if (rc == -1) { - syslog(LOG_WARNING, "keyctl_describe_alloc failed: %s", - strerror(errno)); - rc = 1; - goto out; - } - - if ((strncmp(buf, "cifs.resolver", sizeof("cifs.resolver")-1) == 0) || - (strncmp(buf, "dns_resolver", sizeof("dns_resolver")-1) == 0)) { - rc = cifs_resolver(key, buf); - goto out; - } - - rc = decode_key_description(buf, &kernel_upcall_version, §ype, - &hostname, &uid); - if ((rc & DKD_MUSTHAVE_SET) != DKD_MUSTHAVE_SET) { - syslog(LOG_WARNING, - "unable to get from description necessary params"); - rc = 1; - SAFE_FREE(buf); - goto out; - } - SAFE_FREE(buf); - - if (kernel_upcall_version > CIFS_SPNEGO_UPCALL_VERSION) { - syslog(LOG_WARNING, - "incompatible kernel upcall version: 0x%x", - kernel_upcall_version); - rc = 1; - goto out; - } - - if (rc & DKD_HAVE_UID) { - rc = setuid(uid); - if (rc == -1) { - syslog(LOG_WARNING, "setuid: %s", strerror(errno)); - goto out; - } - } - - /* BB: someday upcall SPNEGO blob could be checked here to decide - * what mech to use */ - - // do mech specific authorization - switch (sectype) { - case MS_KRB5: - case KRB5:{ - char *princ; - size_t len; - - /* for "cifs/" service name + terminating 0 */ - len = strlen(hostname) + 5 + 1; - princ = SMB_XMALLOC_ARRAY(char, len); - if (!princ) { - rc = 1; - break; - } - if (use_cifs_service_prefix) { - strlcpy(princ, "cifs/", len); - } else { - strlcpy(princ, "host/", len); - } - strlcpy(princ + 5, hostname, len - 5); - - if (sectype == MS_KRB5) - oid = OID_KERBEROS5_OLD; - else - oid = OID_KERBEROS5; - - rc = handle_krb5_mech(oid, princ, &secblob, &sess_key); - SAFE_FREE(princ); - break; - } - default:{ - syslog(LOG_WARNING, "sectype: %d is not implemented", - sectype); - rc = 1; - break; - } - } - - if (rc) { - goto out; - } - - /* pack SecurityBLob and SessionKey into downcall packet */ - datalen = - sizeof(struct cifs_spnego_msg) + secblob.length + sess_key.length; - keydata = (struct cifs_spnego_msg*)SMB_XMALLOC_ARRAY(char, datalen); - if (!keydata) { - rc = 1; - goto out; - } - keydata->version = kernel_upcall_version; - keydata->flags = 0; - keydata->sesskey_len = sess_key.length; - keydata->secblob_len = secblob.length; - memcpy(&(keydata->data), sess_key.data, sess_key.length); - memcpy(&(keydata->data) + keydata->sesskey_len, - secblob.data, secblob.length); - - /* setup key */ - rc = keyctl_instantiate(key, keydata, datalen, 0); - if (rc == -1) { - syslog(LOG_WARNING, "keyctl_instantiate: %s", strerror(errno)); - goto out; - } - - /* BB: maybe we need use timeout for key: for example no more then - * ticket lifietime? */ - /* keyctl_set_timeout( key, 60); */ -out: - /* - * on error, negatively instantiate the key ourselves so that we can - * make sure the kernel doesn't hang it off of a searchable keyring - * and interfere with the next attempt to instantiate the key. - */ - if (rc != 0 && key == 0) - keyctl_negate(key, 1, KEY_REQKEY_DEFL_DEFAULT); - data_blob_free(&secblob); - data_blob_free(&sess_key); - SAFE_FREE(hostname); - SAFE_FREE(keydata); - return rc; -} |