diff options
Diffstat (limited to 'source3/passdb/machine_sid.c')
| -rw-r--r-- | source3/passdb/machine_sid.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/source3/passdb/machine_sid.c b/source3/passdb/machine_sid.c new file mode 100644 index 0000000000..f714106b43 --- /dev/null +++ b/source3/passdb/machine_sid.c @@ -0,0 +1,260 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + Password and authentication handling + Copyright (C) Jeremy Allison 1996-1998 + Copyright (C) Luke Kenneth Casson Leighton 1996-1998 + Copyright (C) Gerald (Jerry) Carter 2000 + + 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., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + +/**************************************************************************** + Read the machine SID from a file. +****************************************************************************/ + +static BOOL read_sid_from_file(int fd, char *sid_file) +{ + fstring fline; + + memset(fline, '\0', sizeof(fline)); + + if(read(fd, fline, sizeof(fline) -1 ) < 0) { + DEBUG(0,("unable to read file %s. Error was %s\n", + sid_file, strerror(errno) )); + return False; + } + + /* + * Convert to the machine SID. + */ + + fline[sizeof(fline)-1] = '\0'; + if(!string_to_sid( &global_sam_sid, fline)) { + DEBUG(0,("unable to generate machine SID.\n")); + return False; + } + + return True; +} + +/**************************************************************************** + Generate the global machine sid. Look for the MACHINE.SID file first, if + not found then look in smb.conf and use it to create the MACHINE.SID file. + Note this function will be replaced soon. JRA. +****************************************************************************/ + +BOOL pdb_generate_sam_sid(void) +{ + int fd; + char *p; + pstring sid_file; + fstring sid_string; + SMB_STRUCT_STAT st; + BOOL overwrite_bad_sid = False; + + generate_wellknown_sids(); + + pstrcpy(sid_file, lp_smb_passwd_file()); + p = strrchr(sid_file, '/'); + if(p != NULL) { + *++p = '\0'; + } + + if (!directory_exist(sid_file, NULL)) { + if (mkdir(sid_file, 0700) != 0) { + DEBUG(0,("can't create private directory %s : %s\n", + sid_file, strerror(errno))); + return False; + } + } + + pstrcat(sid_file, "MACHINE.SID"); + + if((fd = sys_open(sid_file, O_RDWR | O_CREAT, 0644)) == -1) { + DEBUG(0,("unable to open or create file %s. Error was %s\n", + sid_file, strerror(errno) )); + return False; + } + + /* + * Check if the file contains data. + */ + + if(sys_fstat( fd, &st) < 0) { + DEBUG(0,("unable to stat file %s. Error was %s\n", + sid_file, strerror(errno) )); + close(fd); + return False; + } + + if(st.st_size > 0) { + /* + * We have a valid SID - read it. + */ + if(!read_sid_from_file( fd, sid_file)) { + DEBUG(0,("unable to read file %s. Error was %s\n", + sid_file, strerror(errno) )); + close(fd); + return False; + } + + /* + * JRA. Reversed the sense of this test now that I have + * actually done this test *personally*. One more reason + * to never trust third party information you have not + * independently verified.... sigh. JRA. + */ + + if(global_sam_sid.num_auths > 0 && global_sam_sid.sub_auths[0] == 0x21) { + /* + * Fix and re-write... + */ + overwrite_bad_sid = True; + global_sam_sid.sub_auths[0] = 21; + DEBUG(5,("pdb_generate_sam_sid: Old (incorrect) sid id_auth of hex 21 \ +detected - re-writing to be decimal 21 instead.\n" )); + sid_to_string(sid_string, &global_sam_sid); + if(sys_lseek(fd, (SMB_OFF_T)0, SEEK_SET) != 0) { + DEBUG(0,("unable to seek file file %s. Error was %s\n", + sid_file, strerror(errno) )); + close(fd); + return False; + } + } else { + close(fd); + return True; + } + } else { + /* + * The file contains no data - we need to generate our + * own sid. + * Generate the new sid data & turn it into a string. + */ + int i; + uchar raw_sid_data[12]; + DOM_SID mysid; + + memset((char *)&mysid, '\0', sizeof(DOM_SID)); + mysid.sid_rev_num = 1; + mysid.id_auth[5] = 5; + mysid.num_auths = 0; + mysid.sub_auths[mysid.num_auths++] = 21; + + generate_random_buffer( raw_sid_data, 12, True); + for( i = 0; i < 3; i++) + mysid.sub_auths[mysid.num_auths++] = IVAL(raw_sid_data, i*4); + + sid_to_string(sid_string, &mysid); + } + + fstrcat(sid_string, "\n"); + + /* + * Ensure our new SID is valid. + */ + + if(!string_to_sid( &global_sam_sid, sid_string)) { + DEBUG(0,("unable to generate machine SID.\n")); + return False; + } + + /* + * Do an exclusive blocking lock on the file. + */ + + if(!do_file_lock( fd, 60, F_WRLCK)) { + DEBUG(0,("unable to lock file %s. Error was %s\n", + sid_file, strerror(errno) )); + close(fd); + return False; + } + + if(!overwrite_bad_sid) { + /* + * At this point we have a blocking lock on the SID + * file - check if in the meantime someone else wrote + * SID data into the file. If so - they were here first, + * use their data. + */ + + if(sys_fstat( fd, &st) < 0) { + DEBUG(0,("unable to stat file %s. Error was %s\n", + sid_file, strerror(errno) )); + close(fd); + return False; + } + + if(st.st_size > 0) { + /* + * Unlock as soon as possible to reduce + * contention on the exclusive lock. + */ + do_file_lock( fd, 60, F_UNLCK); + + /* + * We have a valid SID - read it. + */ + + if(!read_sid_from_file( fd, sid_file)) { + DEBUG(0,("unable to read file %s. Error was %s\n", + sid_file, strerror(errno) )); + close(fd); + return False; + } + close(fd); + return True; + } + } + + /* + * The file is still empty and we have an exlusive lock on it, + * or we're fixing an earlier mistake. + * Write out out SID data into the file. + */ + + /* + * Use chmod here as some (strange) UNIX's don't + * have fchmod. JRA. + */ + + if(chmod(sid_file, 0644) < 0) { + DEBUG(0,("unable to set correct permissions on file %s. \ +Error was %s\n", sid_file, strerror(errno) )); + do_file_lock( fd, 60, F_UNLCK); + close(fd); + return False; + } + + if(write( fd, sid_string, strlen(sid_string)) != strlen(sid_string)) { + DEBUG(0,("unable to write file %s. Error was %s\n", + sid_file, strerror(errno) )); + do_file_lock( fd, 60, F_UNLCK); + close(fd); + return False; + } + + /* + * Unlock & exit. + */ + + do_file_lock( fd, 60, F_UNLCK); + close(fd); + return True; +} + + |