/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2005 Doug Rabson * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 #include #include #include #include #include #include #include "mech_switch.h" #include "utils.h" #ifndef _PATH_GSS_MECH #define _PATH_GSS_MECH "/etc/gss/mech" #endif struct _gss_mech_switch_list _gss_mechs = SLIST_HEAD_INITIALIZER(_gss_mechs); gss_OID_set _gss_mech_oids; /* * Convert a string containing an OID in 'dot' form * (e.g. 1.2.840.113554.1.2.2) to a gss_OID. */ static int _gss_string_to_oid(const char* s, gss_OID oid) { int number_count, i, j; int byte_count; const char *p, *q; char *res; oid->length = 0; oid->elements = NULL; /* * First figure out how many numbers in the oid, then * calculate the compiled oid size. */ number_count = 0; for (p = s; p; p = q) { q = strchr(p, '.'); if (q) q = q + 1; number_count++; } /* * The first two numbers are in the first byte and each * subsequent number is encoded in a variable byte sequence. */ if (number_count < 2) return (EINVAL); /* * We do this in two passes. The first pass, we just figure * out the size. Second time around, we actually encode the * number. */ res = NULL; for (i = 0; i < 2; i++) { byte_count = 0; for (p = s, j = 0; p; p = q, j++) { unsigned int number = 0; /* * Find the end of this number. */ q = strchr(p, '.'); if (q) q = q + 1; /* * Read the number of of the string. Don't * bother with anything except base ten. */ while (*p && *p != '.') { number = 10 * number + (*p - '0'); p++; } /* * Encode the number. The first two numbers * are packed into the first byte. Subsequent * numbers are encoded in bytes seven bits at * a time with the last byte having the high * bit set. */ if (j == 0) { if (res) *res = number * 40; } else if (j == 1) { if (res) { *res += number; res++; } byte_count++; } else if (j >= 2) { /* * The number is encoded in seven bit chunks. */ unsigned int t; int bytes; bytes = 0; for (t = number; t; t >>= 7) bytes++; if (bytes == 0) bytes = 1; while (bytes) { if (res) { int bit = 7*(bytes-1); *res = (number >> bit) & 0x7f; if (bytes != 1) *res |= 0x80; res++; } byte_count++; bytes--; } } } if (!res) { res = malloc(byte_count); if (!res) return (ENOMEM); oid->length = byte_count; oid->elements = res; } } return (0); } #define SYM(name) \ do { \ snprintf(buf, sizeof(buf), "%s_%s", \ m->gm_name_prefix, #name); \ m->gm_ ## name = dlsym(so, buf); \ if (!m->gm_ ## name) { \ fprintf(stderr, "can't find symbol %s\n", buf); \ goto bad; \ } \ } while (0) #define OPTSYM(name) \ do { \ snprintf(buf, sizeof(buf), "%s_%s", \ m->gm_name_prefix, #name); \ m->gm_ ## name = dlsym(so, buf); \ } while (0) /* * Load the mechanisms file (/etc/gss/mech). */ void _gss_load_mech(void) { OM_uint32 major_status, minor_status; FILE *fp; char buf[256]; char *p; char *name, *oid, *lib, *kobj; struct _gss_mech_switch *m; void *so; const char *(*prefix_fn)(void); if (SLIST_FIRST(&_gss_mechs)) return; major_status = gss_create_empty_oid_set(&minor_status, &_gss_mech_oids); if (major_status) return; fp = fopen(_PATH_GSS_MECH, "r"); if (!fp) { perror(_PATH_GSS_MECH); return; } while (fgets(buf, sizeof(buf), fp)) { if (*buf == '#') continue; p = buf; name = strsep(&p, "\t\n "); if (p) while (isspace(*p)) p++; oid = strsep(&p, "\t\n "); if (p) while (isspace(*p)) p++; lib = strsep(&p, "\t\n "); if (p) while (isspace(*p)) p++; kobj = strsep(&p, "\t\n "); if (!name || !oid || !lib || !kobj) continue; so = dlopen(lib, RTLD_LOCAL); if (!so) { fprintf(stderr, "dlopen: %s\n", dlerror()); continue; } m = malloc(sizeof(struct _gss_mech_switch)); if (!m) break; m->gm_so = so; if (_gss_string_to_oid(oid, &m->gm_mech_oid)) { free(m); continue; } prefix_fn = (const char *(*)(void)) dlsym(so, "_gss_name_prefix"); if (prefix_fn) m->gm_name_prefix = prefix_fn(); else m->gm_name_prefix = "gss"; major_status = gss_add_oid_set_member(&minor_status, &m->gm_mech_oid, &_gss_mech_oids); if (major_status) { free(m->gm_mech_oid.elements); free(m); continue; } SYM(acquire_cred); SYM(release_cred); SYM(init_sec_context); SYM(accept_sec_context); SYM(process_context_token); SYM(delete_sec_context); SYM(context_time); SYM(get_mic); SYM(verify_mic); SYM(wrap); SYM(unwrap); SYM(display_status); OPTSYM(indicate_mechs); SYM(compare_name); SYM(display_name); SYM(import_name); SYM(export_name); SYM(release_name); SYM(inquire_cred); SYM(inquire_context); SYM(wrap_size_limit); SYM(add_cred); SYM(inquire_cred_by_mech); SYM(export_sec_context); SYM(import_sec_context); SYM(inquire_names_for_mech); SYM(inquire_mechs_for_name); SYM(canonicalize_name); SYM(duplicate_name); OPTSYM(inquire_sec_context_by_oid); OPTSYM(inquire_cred_by_oid); OPTSYM(set_sec_context_option); OPTSYM(set_cred_option); OPTSYM(pseudo_random); OPTSYM(pname_to_uid); SLIST_INSERT_HEAD(&_gss_mechs, m, gm_link); continue; bad: free(m->gm_mech_oid.elements); free(m); dlclose(so); continue; } fclose(fp); } struct _gss_mech_switch * _gss_find_mech_switch(gss_OID mech) { struct _gss_mech_switch *m; _gss_load_mech(); SLIST_FOREACH(m, &_gss_mechs, gm_link) { if (gss_oid_equal(&m->gm_mech_oid, mech)) return m; } return (0); }