型定義 | |
typedef enum _secType | secType_t |
列挙型 | |
enum | _secType { KRB5, MS_KRB5 } |
関数 | |
int | handle_krb5_mech (const char *oid, const char *principal, DATA_BLOB *secblob, DATA_BLOB *sess_key) |
int | decode_key_description (const char *desc, int *ver, secType_t *sec, char **hostname, uid_t *uid) |
int | cifs_resolver (const key_serial_t key, const char *key_descr) |
int | main (const int argc, char *const argv[]) |
変数 | |
const char * | CIFSSPNEGO_VERSION = "1.1" |
static const char * | prog = "cifs.spnego" |
enum _secType |
int handle_krb5_mech | ( | const char * | oid, | |
const char * | principal, | |||
DATA_BLOB * | secblob, | |||
DATA_BLOB * | sess_key | |||
) |
cifs.spnego.c の 59 行で定義されています。
参照先 cli_krb5_get_ticket()・data_blob_free()・gen_negTokenInit()・spnego_gen_krb5_wrap().
参照元 main().
00061 { 00062 int retval; 00063 DATA_BLOB tkt, tkt_wrapped; 00064 00065 /* get a kerberos ticket for the service and extract the session key */ 00066 retval = cli_krb5_get_ticket(principal, 0, 00067 &tkt, sess_key, 0, NULL, NULL); 00068 00069 if (retval) 00070 return retval; 00071 00072 /* wrap that up in a nice GSS-API wrapping */ 00073 tkt_wrapped = spnego_gen_krb5_wrap(tkt, TOK_ID_KRB_AP_REQ); 00074 00075 /* and wrap that in a shiny SPNEGO wrapper */ 00076 *secblob = gen_negTokenInit(OID_KERBEROS5, tkt_wrapped); 00077 00078 data_blob_free(&tkt_wrapped); 00079 data_blob_free(&tkt); 00080 return retval; 00081 }
int decode_key_description | ( | const char * | desc, | |
int * | ver, | |||
secType_t * | sec, | |||
char ** | hostname, | |||
uid_t * | uid | |||
) |
cifs.spnego.c の 91 行で定義されています。
参照先 errno・index・KRB5・len・strerror()・strlcpy().
参照元 main().
00093 { 00094 int retval = 0; 00095 char *pos; 00096 const char *tkn = desc; 00097 00098 do { 00099 pos = index(tkn, ';'); 00100 if (strncmp(tkn, "host=", 5) == 0) { 00101 int len; 00102 00103 if (pos == NULL) { 00104 len = strlen(tkn); 00105 } else { 00106 len = pos - tkn; 00107 } 00108 len -= 4; 00109 SAFE_FREE(*hostname); 00110 *hostname = SMB_XMALLOC_ARRAY(char, len); 00111 strlcpy(*hostname, tkn + 5, len); 00112 retval |= DKD_HAVE_HOSTNAME; 00113 } else if (strncmp(tkn, "ipv4=", 5) == 0) { 00114 /* BB: do we need it if we have hostname already? */ 00115 } else if (strncmp(tkn, "ipv6=", 5) == 0) { 00116 /* BB: do we need it if we have hostname already? */ 00117 } else if (strncmp(tkn, "sec=", 4) == 0) { 00118 if (strncmp(tkn + 4, "krb5", 4) == 0) { 00119 retval |= DKD_HAVE_SEC; 00120 *sec = KRB5; 00121 } 00122 } else if (strncmp(tkn, "uid=", 4) == 0) { 00123 errno = 0; 00124 *uid = strtol(tkn + 4, NULL, 16); 00125 if (errno != 0) { 00126 syslog(LOG_WARNING, "Invalid uid format: %s", 00127 strerror(errno)); 00128 return 1; 00129 } else { 00130 retval |= DKD_HAVE_UID; 00131 } 00132 } else if (strncmp(tkn, "ver=", 4) == 0) { /* if version */ 00133 errno = 0; 00134 *ver = strtol(tkn + 4, NULL, 16); 00135 if (errno != 0) { 00136 syslog(LOG_WARNING, 00137 "Invalid version format: %s", 00138 strerror(errno)); 00139 return 1; 00140 } else { 00141 retval |= DKD_HAVE_VERSION; 00142 } 00143 } 00144 if (pos == NULL) 00145 break; 00146 tkn = pos + 1; 00147 } while (tkn); 00148 return retval; 00149 }
int cifs_resolver | ( | const key_serial_t | key, | |
const char * | key_descr | |||
) |
cifs.spnego.c の 151 行で定義されています。
参照先 c・errno・index・strerror().
参照元 main().
00152 { 00153 int c; 00154 struct addrinfo *addr; 00155 char ip[INET6_ADDRSTRLEN]; 00156 void *p; 00157 const char *keyend = key_descr; 00158 /* skip next 4 ';' delimiters to get to description */ 00159 for (c = 1; c <= 4; c++) { 00160 keyend = index(keyend+1, ';'); 00161 if (!keyend) { 00162 syslog(LOG_WARNING, "invalid key description: %s", 00163 key_descr); 00164 return 1; 00165 } 00166 } 00167 keyend++; 00168 00169 /* resolve name to ip */ 00170 c = getaddrinfo(keyend, NULL, NULL, &addr); 00171 if (c) { 00172 syslog(LOG_WARNING, "unable to resolve hostname: %s [%s]", 00173 keyend, gai_strerror(c)); 00174 return 1; 00175 } 00176 00177 /* conver ip to string form */ 00178 if (addr->ai_family == AF_INET) { 00179 p = &(((struct sockaddr_in *)addr->ai_addr)->sin_addr); 00180 } else { 00181 p = &(((struct sockaddr_in6 *)addr->ai_addr)->sin6_addr); 00182 } 00183 if (!inet_ntop(addr->ai_family, p, ip, sizeof(ip))) { 00184 syslog(LOG_WARNING, "%s: inet_ntop: %s", 00185 __FUNCTION__, strerror(errno)); 00186 freeaddrinfo(addr); 00187 return 1; 00188 } 00189 00190 /* setup key */ 00191 c = keyctl_instantiate(key, ip, strlen(ip)+1, 0); 00192 if (c == -1) { 00193 syslog(LOG_WARNING, "%s: keyctl_instantiate: %s", 00194 __FUNCTION__, strerror(errno)); 00195 freeaddrinfo(addr); 00196 return 1; 00197 } 00198 00199 freeaddrinfo(addr); 00200 return 0; 00201 }
int main | ( | const int | argc, | |
char *const | argv[] | |||
) |
cifs.spnego.c の 203 行で定義されています。
参照先 buf・c・cifs_resolver()・CIFSSPNEGO_VERSION・cifs_spnego_msg::data・data_blob_free()・data_blob_null・decode_key_description()・errno・fprintf()・handle_krb5_mech()・KRB5・len・optind・prog・cifs_spnego_msg::secblob_len・strerror()・strlcpy()・cifs_spnego_msg::version.
参照元 parse_quota_set().
00204 { 00205 struct cifs_spnego_msg *keydata = NULL; 00206 DATA_BLOB secblob = data_blob_null; 00207 DATA_BLOB sess_key = data_blob_null; 00208 secType_t sectype; 00209 key_serial_t key; 00210 size_t datalen; 00211 long rc = 1; 00212 uid_t uid; 00213 int kernel_upcall_version; 00214 int c, use_cifs_service_prefix = 0; 00215 char *buf, *hostname = NULL; 00216 00217 openlog(prog, 0, LOG_DAEMON); 00218 if (argc < 1) { 00219 syslog(LOG_WARNING, "Usage: %s [-c] key_serial", prog); 00220 goto out; 00221 } 00222 00223 while ((c = getopt(argc, argv, "cv")) != -1) { 00224 switch (c) { 00225 case 'c':{ 00226 use_cifs_service_prefix = 1; 00227 break; 00228 } 00229 case 'v':{ 00230 syslog(LOG_WARNING, "version: %s", CIFSSPNEGO_VERSION); 00231 fprintf(stderr, "version: %s", CIFSSPNEGO_VERSION); 00232 break; 00233 } 00234 default:{ 00235 syslog(LOG_WARNING, "unknow option: %c", c); 00236 goto out; 00237 } 00238 } 00239 } 00240 /* get key and keyring values */ 00241 errno = 0; 00242 key = strtol(argv[optind], NULL, 10); 00243 if (errno != 0) { 00244 syslog(LOG_WARNING, "Invalid key format: %s", strerror(errno)); 00245 goto out; 00246 } 00247 00248 rc = keyctl_describe_alloc(key, &buf); 00249 if (rc == -1) { 00250 syslog(LOG_WARNING, "keyctl_describe_alloc failed: %s", 00251 strerror(errno)); 00252 rc = 1; 00253 goto out; 00254 } 00255 00256 if (strncmp(buf, "cifs.resolver", sizeof("cifs.resolver")-1) == 0) { 00257 rc = cifs_resolver(key, buf); 00258 goto out; 00259 } 00260 00261 rc = decode_key_description(buf, &kernel_upcall_version, §ype, 00262 &hostname, &uid); 00263 if ((rc & DKD_MUSTHAVE_SET) != DKD_MUSTHAVE_SET) { 00264 syslog(LOG_WARNING, 00265 "unable to get from description necessary params"); 00266 rc = 1; 00267 SAFE_FREE(buf); 00268 goto out; 00269 } 00270 SAFE_FREE(buf); 00271 00272 if (kernel_upcall_version != CIFS_SPNEGO_UPCALL_VERSION) { 00273 syslog(LOG_WARNING, 00274 "incompatible kernel upcall version: 0x%x", 00275 kernel_upcall_version); 00276 rc = 1; 00277 goto out; 00278 } 00279 00280 if (rc & DKD_HAVE_UID) { 00281 rc = setuid(uid); 00282 if (rc == -1) { 00283 syslog(LOG_WARNING, "setuid: %s", strerror(errno)); 00284 goto out; 00285 } 00286 } 00287 00288 /* BB: someday upcall SPNEGO blob could be checked here to decide 00289 * what mech to use */ 00290 00291 // do mech specific authorization 00292 switch (sectype) { 00293 case KRB5:{ 00294 char *princ; 00295 size_t len; 00296 00297 /* for "cifs/" service name + terminating 0 */ 00298 len = strlen(hostname) + 5 + 1; 00299 princ = SMB_XMALLOC_ARRAY(char, len); 00300 if (!princ) { 00301 rc = 1; 00302 break; 00303 } 00304 if (use_cifs_service_prefix) { 00305 strlcpy(princ, "cifs/", len); 00306 } else { 00307 strlcpy(princ, "host/", len); 00308 } 00309 strlcpy(princ + 5, hostname, len - 5); 00310 00311 rc = handle_krb5_mech(OID_KERBEROS5, princ, 00312 &secblob, &sess_key); 00313 SAFE_FREE(princ); 00314 break; 00315 } 00316 default:{ 00317 syslog(LOG_WARNING, "sectype: %d is not implemented", 00318 sectype); 00319 rc = 1; 00320 break; 00321 } 00322 } 00323 00324 if (rc) { 00325 goto out; 00326 } 00327 00328 /* pack SecurityBLob and SessionKey into downcall packet */ 00329 datalen = 00330 sizeof(struct cifs_spnego_msg) + secblob.length + sess_key.length; 00331 keydata = (struct cifs_spnego_msg*)SMB_XMALLOC_ARRAY(char, datalen); 00332 if (!keydata) { 00333 rc = 1; 00334 goto out; 00335 } 00336 keydata->version = CIFS_SPNEGO_UPCALL_VERSION; 00337 keydata->flags = 0; 00338 keydata->sesskey_len = sess_key.length; 00339 keydata->secblob_len = secblob.length; 00340 memcpy(&(keydata->data), sess_key.data, sess_key.length); 00341 memcpy(&(keydata->data) + keydata->sesskey_len, 00342 secblob.data, secblob.length); 00343 00344 /* setup key */ 00345 rc = keyctl_instantiate(key, keydata, datalen, 0); 00346 if (rc == -1) { 00347 syslog(LOG_WARNING, "keyctl_instantiate: %s", strerror(errno)); 00348 goto out; 00349 } 00350 00351 /* BB: maybe we need use timeout for key: for example no more then 00352 * ticket lifietime? */ 00353 /* keyctl_set_timeout( key, 60); */ 00354 out: 00355 data_blob_free(&secblob); 00356 data_blob_free(&sess_key); 00357 SAFE_FREE(hostname); 00358 SAFE_FREE(keydata); 00359 return rc; 00360 }
const char* CIFSSPNEGO_VERSION = "1.1" |
const char* prog = "cifs.spnego" [static] |