diff options
Diffstat (limited to 'source3/lib/util_sid.c')
| -rw-r--r-- | source3/lib/util_sid.c | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/source3/lib/util_sid.c b/source3/lib/util_sid.c index 295fd0efac..b497a1e455 100644 --- a/source3/lib/util_sid.c +++ b/source3/lib/util_sid.c @@ -245,3 +245,299 @@ DOM_SID *sid_dup(const DOM_SID *src) return dst; } + + +/**************************************************************************** + Read a SID from a file. +****************************************************************************/ + +static BOOL read_sid_from_file(int fd, char *sid_file, DOM_SID *sid) +{ + fstring fline; + fstring sid_str; + + 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(sid, fline)) { + DEBUG(0,("unable to generate machine SID.\n")); + return False; + } + + sid_to_string(sid_str, sid); + DEBUG(5,("read_sid_from_file: sid %s\n", sid_str)); + + return True; +} + +/**************************************************************************** + Generate the global machine sid. Look for the DOMAINNAME.SID file first, if + not found then look in smb.conf and use it to create the DOMAINNAME.SID file. +****************************************************************************/ +BOOL read_sid(char *domain_name, DOM_SID *sid) +{ + int fd; + char *p; + pstring sid_file; + fstring sid_string; + fstring file_name; + SMB_STRUCT_STAT st; + + pstrcpy(sid_file, lp_smb_passwd_file()); + sid_to_string(sid_string, sid); + + DEBUG(10,("read_sid: Domain: %s SID: %s\n", domain_name, sid_string)); + fstrcat(sid_string, "\n"); + + if (sid_file[0] == 0) + { + DEBUG(0,("cannot find smb passwd file\n")); + return False; + } + + 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; + } + } + + slprintf(file_name, sizeof(file_name)-1, "%s.SID", domain_name); + strupper(file_name); + pstrcat(sid_file, file_name); + + 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) + { + close(fd); + return False; + } + + /* + * We have a valid SID - read it. + */ + + if (!read_sid_from_file(fd, sid_file, sid)) + { + DEBUG(0,("unable to read file %s. Error was %s\n", + sid_file, strerror(errno) )); + close(fd); + return False; + } + close(fd); + return True; +} + + +/**************************************************************************** + Generate the global machine sid. Look for the DOMAINNAME.SID file first, if + not found then look in smb.conf and use it to create the DOMAINNAME.SID file. +****************************************************************************/ +BOOL write_sid(char *domain_name, DOM_SID *sid) +{ + int fd; + char *p; + pstring sid_file; + fstring sid_string; + fstring file_name; + SMB_STRUCT_STAT st; + + pstrcpy(sid_file, lp_smb_passwd_file()); + sid_to_string(sid_string, sid); + + DEBUG(10,("write_sid: Domain: %s SID: %s\n", domain_name, sid_string)); + fstrcat(sid_string, "\n"); + + if (sid_file[0] == 0) + { + DEBUG(0,("cannot find smb passwd file\n")); + return False; + } + + 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; + } + } + + slprintf(file_name, sizeof(file_name)-1, "%s.SID", domain_name); + strupper(file_name); + pstrcat(sid_file, file_name); + + 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 already. + */ + close(fd); + DEBUG(0,("SID file %s already exists\n", sid_file)); + return False; + } + + 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; + } + + /* + * 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 already. + */ + + DEBUG(0,("SID file %s already exists\n", sid_file)); + close(fd); + return False; + } + + /* + * The file is still empty and we have an exlusive lock on it. + * Write out out SID data into the file. + */ + + if (fchmod(fd, 0644) < 0) + { + DEBUG(0,("unable to set correct permissions on file %s. \ +Error was %s\n", sid_file, strerror(errno) )); + 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) )); + close(fd); + return False; + } + + /* + * Unlock & exit. + */ + + do_file_lock(fd, 60, F_UNLCK); + close(fd); + return True; +} + +/**************************************************************************** +create a random SID. +****************************************************************************/ +BOOL create_new_sid(DOM_SID *sid) +{ + uchar raw_sid_data[12]; + fstring sid_string; + int i; + + /* + * Generate the new sid data & turn it into a string. + */ + generate_random_buffer(raw_sid_data, 12, True); + + fstrcpy(sid_string, "S-1-5-21"); + for(i = 0; i < 3; i++) + { + fstring tmp_string; + slprintf(tmp_string, sizeof(tmp_string) - 1, "-%u", IVAL(raw_sid_data, i*4)); + fstrcat(sid_string, tmp_string); + } + + fstrcat(sid_string, "\n"); + + /* + * Ensure our new SID is valid. + */ + + if (!string_to_sid(sid, sid_string)) + { + DEBUG(0,("unable to generate machine SID.\n")); + return False; + } + + return True; +} + |