/* * Copyright (c) 2009-2014 Todd C. Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #ifdef STDC_HEADERS # include # include #else # ifdef HAVE_STDLIB_H # include # endif #endif /* STDC_HEADERS */ #ifdef HAVE_STRING_H # include #endif /* HAVE_STRING_H */ #ifdef HAVE_STRINGS_H # include #endif /* HAVE_STRINGS_H */ #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #ifdef TIME_WITH_SYS_TIME # include #endif #include #include #include #include #include #ifdef HAVE_ZLIB_H # include #endif #include "sudoers.h" #include "iolog.h" struct script_buf { int len; /* buffer length (how much read in) */ int off; /* write position (how much already consumed) */ char buf[16 * 1024]; }; /* XXX - separate sudoers.h and iolog.h? */ #undef runas_pw #undef runas_gr struct iolog_details { const char *cwd; const char *tty; const char *user; const char *command; const char *iolog_path; struct passwd *runas_pw; struct group *runas_gr; int lines; int cols; }; static int iolog_compress; static struct timeval last_time; static unsigned int sessid_max = SESSID_MAX; /* sudoers_io is declared at the end of this file. */ extern __dso_public struct io_plugin sudoers_io; /* * Create path and any parent directories as needed. * If is_temp is set, use mkdtemp() for the final directory. */ static void io_mkdirs(char *path, mode_t mode, bool is_temp) { struct stat sb; gid_t parent_gid = 0; char *slash = path; debug_decl(io_mkdirs, SUDO_DEBUG_UTIL) /* Fast path: not a temporary and already exists. */ if (!is_temp && stat(path, &sb) == 0) { if (!S_ISDIR(sb.st_mode)) { log_fatal(0, N_("%s exists but is not a directory (0%o)"), path, (unsigned int) sb.st_mode); } debug_return; } while ((slash = strchr(slash + 1, '/')) != NULL) { *slash = '\0'; if (stat(path, &sb) != 0) { if (mkdir(path, mode) != 0) log_fatal(USE_ERRNO, N_("unable to mkdir %s"), path); ignore_result(chown(path, (uid_t)-1, parent_gid)); } else if (!S_ISDIR(sb.st_mode)) { log_fatal(0, N_("%s exists but is not a directory (0%o)"), path, (unsigned int) sb.st_mode); } else { /* Inherit gid of parent dir for ownership. */ parent_gid = sb.st_gid; } *slash = '/'; } /* Create final path component. */ if (is_temp) { if (mkdtemp(path) == NULL) log_fatal(USE_ERRNO, N_("unable to mkdir %s"), path); ignore_result(chown(path, (uid_t)-1, parent_gid)); } else { if (mkdir(path, mode) != 0 && errno != EEXIST) log_fatal(USE_ERRNO, N_("unable to mkdir %s"), path); ignore_result(chown(path, (uid_t)-1, parent_gid)); } debug_return; } /* * Set max session ID (aka sequence number) */ int io_set_max_sessid(const char *maxval) { const char *errstr; unsigned int value; debug_decl(io_set_max_sessid, SUDO_DEBUG_UTIL) value = strtonum(maxval, 0, SESSID_MAX, &errstr); if (errstr != NULL) { if (errno != ERANGE) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO, "bad maxseq: %s: %s", maxval, errstr); debug_return_bool(false); } /* Out of range, clamp to SESSID_MAX as documented. */ value = SESSID_MAX; } sessid_max = value; debug_return_bool(true); } /* * Read the on-disk sequence number, set sessid to the next * number, and update the on-disk copy. * Uses file locking to avoid sequence number collisions. */ void io_nextid(char *iolog_dir, char *iolog_dir_fallback, char sessid[7]) { struct stat sb; char buf[32], *ep; int fd, i; unsigned long id = 0; int len; ssize_t nread; char pathbuf[PATH_MAX]; static const char b36char[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; debug_decl(io_nextid, SUDO_DEBUG_UTIL) /* * Create I/O log directory if it doesn't already exist. */ io_mkdirs(iolog_dir, S_IRWXU, false); /* * Open sequence file */ len = snprintf(pathbuf, sizeof(pathbuf), "%s/seq", iolog_dir); if (len <= 0 || (size_t)len >= sizeof(pathbuf)) { errno = ENAMETOOLONG; log_fatal(USE_ERRNO, "%s/seq", pathbuf); } fd = open(pathbuf, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR); if (fd == -1) log_fatal(USE_ERRNO, N_("unable to open %s"), pathbuf); lock_file(fd, SUDO_LOCK); /* * If there is no seq file in iolog_dir and a fallback dir was * specified, look for seq in the fallback dir. This is to work * around a bug in sudo 1.8.5 and older where iolog_dir was not * expanded before the sequence number was updated. */ if (iolog_dir_fallback != NULL && fstat(fd, &sb) == 0 && sb.st_size == 0) { char fallback[PATH_MAX]; len = snprintf(fallback, sizeof(fallback), "%s/seq", iolog_dir_fallback); if (len > 0 && (size_t)len < sizeof(fallback)) { int fd2 = open(fallback, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR); if (fd2 != -1) { nread = read(fd2, buf, sizeof(buf) - 1); if (nread > 0) { if (buf[nread - 1] == '\n') nread--; buf[nread] = '\0'; id = strtoul(buf, &ep, 36); if (ep == buf || *ep != '\0' || id >= sessid_max) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO, "%s: bad sequence number: %s", fallback, buf); id = 0; } } close(fd2); } } } /* Read current seq number (base 36). */ if (id == 0) { nread = read(fd, buf, sizeof(buf) - 1); if (nread != 0) { if (nread == -1) log_fatal(USE_ERRNO, N_("unable to read %s"), pathbuf); if (buf[nread - 1] == '\n') nread--; buf[nread] = '\0'; id = strtoul(buf, &ep, 36); if (ep == buf || *ep != '\0' || id >= sessid_max) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO, "%s: bad sequence number: %s", pathbuf, buf); id = 0; } } } id++; /* * Convert id to a string and stash in sessid. * Note that that least significant digits go at the end of the string. */ for (i = 5; i >= 0; i--) { buf[i] = b36char[id % 36]; id /= 36; } buf[6] = '\n'; /* Stash id for logging purposes. */ memcpy(sessid, buf, 6); sessid[6] = '\0'; /* Rewind and overwrite old seq file, including the NUL byte. */ if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1 || write(fd, buf, 7) != 7) log_fatal(USE_ERRNO, N_("unable to write to %s"), pathbuf); close(fd); debug_return; } /* * Copy iolog_path to pathbuf and create the directory and any intermediate * directories. If iolog_path ends in 'XXXXXX', use mkdtemp(). */ static size_t mkdir_iopath(const char *iolog_path, char *pathbuf, size_t pathsize) { size_t len; bool is_temp = false; debug_decl(mkdir_iopath, SUDO_DEBUG_UTIL) len = strlcpy(pathbuf, iolog_path, pathsize); if (len >= pathsize) { errno = ENAMETOOLONG; log_fatal(USE_ERRNO, "%s", iolog_path); } /* * Create path and intermediate subdirs as needed. * If path ends in at least 6 Xs (ala POSIX mktemp), use mkdtemp(). */ if (len >= 6 && strcmp(&pathbuf[len - 6], "XXXXXX") == 0) is_temp = true; io_mkdirs(pathbuf, S_IRWXU, is_temp); debug_return_size_t(len); } /* * Append suffix to pathbuf after len chars and open the resulting file. * Note that the size of pathbuf is assumed to be PATH_MAX. * Uses zlib if docompress is true. * Stores the open file handle which has the close-on-exec flag set. */ static void open_io_fd(char *pathbuf, size_t len, struct io_log_file *iol, bool docompress) { int fd; debug_decl(open_io_fd, SUDO_DEBUG_UTIL) pathbuf[len] = '\0'; strlcat(pathbuf, iol->suffix, PATH_MAX); if (iol->enabled) { fd = open(pathbuf, O_CREAT|O_TRUNC|O_WRONLY, S_IRUSR|S_IWUSR); if (fd != -1) { fcntl(fd, F_SETFD, FD_CLOEXEC); #ifdef HAVE_ZLIB_H if (docompress) iol->fd.g = gzdopen(fd, "w"); else #endif iol->fd.f = fdopen(fd, "w"); } if (fd == -1 || iol->fd.v == NULL) log_fatal(USE_ERRNO, N_("unable to create %s"), pathbuf); } else { /* Remove old log file if we recycled sequence numbers. */ unlink(pathbuf); } debug_return; } /* * Pull out I/O log related data from user_info and command_info arrays. * Returns true if I/O logging is enabled, else false. */ static bool iolog_deserialize_info(struct iolog_details *details, char * const user_info[], char * const command_info[]) { const char *runas_uid_str = "0", *runas_euid_str = NULL; const char *runas_gid_str = "0", *runas_egid_str = NULL; const char *errstr; char idbuf[MAX_UID_T_LEN + 2]; char * const *cur; id_t id; uid_t runas_uid = 0; gid_t runas_gid = 0; debug_decl(iolog_deserialize_info, SUDO_DEBUG_UTIL) details->lines = 24; details->cols = 80; for (cur = user_info; *cur != NULL; cur++) { switch (**cur) { case 'c': if (strncmp(*cur, "cols=", sizeof("cols=") - 1) == 0) { int n = strtonum(*cur + sizeof("cols=") - 1, 1, INT_MAX, NULL); if (n > 0) details->cols = n; continue; } if (strncmp(*cur, "cwd=", sizeof("cwd=") - 1) == 0) { details->cwd = *cur + sizeof("cwd=") - 1; continue; } break; case 'l': if (strncmp(*cur, "lines=", sizeof("lines=") - 1) == 0) { int n = strtonum(*cur + sizeof("lines=") - 1, 1, INT_MAX, NULL); if (n > 0) details->lines = n; continue; } break; case 't': if (strncmp(*cur, "tty=", sizeof("tty=") - 1) == 0) { details->tty = *cur + sizeof("tty=") - 1; continue; } break; case 'u': if (strncmp(*cur, "user=", sizeof("user=") - 1) == 0) { details->user = *cur + sizeof("user=") - 1; continue; } break; } } for (cur = command_info; *cur != NULL; cur++) { switch (**cur) { case 'c': if (strncmp(*cur, "command=", sizeof("command=") - 1) == 0) { details->command = *cur + sizeof("command=") - 1; continue; } break; case 'i': if (strncmp(*cur, "iolog_path=", sizeof("iolog_path=") - 1) == 0) { details->iolog_path = *cur + sizeof("iolog_path=") - 1; continue; } if (strncmp(*cur, "iolog_stdin=", sizeof("iolog_stdin=") - 1) == 0) { if (atobool(*cur + sizeof("iolog_stdin=") - 1) == true) io_log_files[IOFD_STDIN].enabled = true; continue; } if (strncmp(*cur, "iolog_stdout=", sizeof("iolog_stdout=") - 1) == 0) { if (atobool(*cur + sizeof("iolog_stdout=") - 1) == true) io_log_files[IOFD_STDOUT].enabled = true; continue; } if (strncmp(*cur, "iolog_stderr=", sizeof("iolog_stderr=") - 1) == 0) { if (atobool(*cur + sizeof("iolog_stderr=") - 1) == true) io_log_files[IOFD_STDERR].enabled = true; continue; } if (strncmp(*cur, "iolog_ttyin=", sizeof("iolog_ttyin=") - 1) == 0) { if (atobool(*cur + sizeof("iolog_ttyin=") - 1) == true) io_log_files[IOFD_TTYIN].enabled = true; continue; } if (strncmp(*cur, "iolog_ttyout=", sizeof("iolog_ttyout=") - 1) == 0) { if (atobool(*cur + sizeof("iolog_ttyout=") - 1) == true) io_log_files[IOFD_TTYOUT].enabled = true; continue; } if (strncmp(*cur, "iolog_compress=", sizeof("iolog_compress=") - 1) == 0) { if (atobool(*cur + sizeof("iolog_compress=") - 1) == true) iolog_compress = true; /* must be global */ continue; } break; case 'm': if (strncmp(*cur, "maxseq=", sizeof("maxseq=") - 1) == 0) io_set_max_sessid(*cur + sizeof("maxseq=") - 1); break; case 'r': if (strncmp(*cur, "runas_gid=", sizeof("runas_gid=") - 1) == 0) { runas_gid_str = *cur + sizeof("runas_gid=") - 1; continue; } if (strncmp(*cur, "runas_egid=", sizeof("runas_egid=") - 1) == 0) { runas_egid_str = *cur + sizeof("runas_egid=") - 1; continue; } if (strncmp(*cur, "runas_uid=", sizeof("runas_uid=") - 1) == 0) { runas_uid_str = *cur + sizeof("runas_uid=") - 1; continue; } if (strncmp(*cur, "runas_euid=", sizeof("runas_euid=") - 1) == 0) { runas_euid_str = *cur + sizeof("runas_euid=") - 1; continue; } break; } } /* * Lookup runas user and group, preferring effective over real uid/gid. */ if (runas_euid_str != NULL) runas_uid_str = runas_euid_str; if (runas_uid_str != NULL) { id = atoid(runas_uid_str, NULL, NULL, &errstr); if (errstr != NULL) warningx("runas uid %s: %s", runas_uid_str, U_(errstr)); else runas_uid = (uid_t)id; } if (runas_egid_str != NULL) runas_gid_str = runas_egid_str; if (runas_gid_str != NULL) { id = atoid(runas_gid_str, NULL, NULL, &errstr); if (errstr != NULL) warningx("runas gid %s: %s", runas_gid_str, U_(errstr)); else runas_gid = (gid_t)id; } details->runas_pw = sudo_getpwuid(runas_uid); if (details->runas_pw == NULL) { idbuf[0] = '#'; strlcpy(&idbuf[1], runas_uid_str, sizeof(idbuf) - 1); details->runas_pw = sudo_fakepwnam(idbuf, runas_gid); } if (runas_gid != details->runas_pw->pw_gid) { details->runas_gr = sudo_getgrgid(runas_gid); if (details->runas_gr == NULL) { idbuf[0] = '#'; strlcpy(&idbuf[1], runas_gid_str, sizeof(idbuf) - 1); details->runas_gr = sudo_fakegrnam(idbuf); } } debug_return_bool( io_log_files[IOFD_STDIN].enabled || io_log_files[IOFD_STDOUT].enabled || io_log_files[IOFD_STDERR].enabled || io_log_files[IOFD_TTYIN].enabled || io_log_files[IOFD_TTYOUT].enabled); } /* * Write the "/log" file that contains the user and command info. */ void write_info_log(char *pathbuf, size_t len, struct iolog_details *details, char * const argv[], struct timeval *now) { char * const *av; FILE *fp; int fd; pathbuf[len] = '\0'; strlcat(pathbuf, "/log", PATH_MAX); fd = open(pathbuf, O_CREAT|O_TRUNC|O_WRONLY, S_IRUSR|S_IWUSR); if (fd == -1 || (fp = fdopen(fd, "w")) == NULL) log_fatal(USE_ERRNO, N_("unable to create %s"), pathbuf); fprintf(fp, "%lld:%s:%s:%s:%s:%d:%d\n%s\n%s", (long long)now->tv_sec, details->user ? details->user : "unknown", details->runas_pw->pw_name, details->runas_gr ? details->runas_gr->gr_name : "", details->tty ? details->tty : "unknown", details->lines, details->cols, details->cwd ? details->cwd : "unknown", details->command ? details->command : "unknown"); for (av = argv + 1; *av != NULL; av++) { fputc(' ', fp); fputs(*av, fp); } fputc('\n', fp); fclose(fp); } static int sudoers_io_open(unsigned int version, sudo_conv_t conversation, sudo_printf_t plugin_printf, char * const settings[], char * const user_info[], char * const command_info[], int argc, char * const argv[], char * const user_env[], char * const args[]) { struct iolog_details details; char pathbuf[PATH_MAX], sessid[7]; char *tofree = NULL; char * const *cur; const char *debug_flags = NULL; size_t len; int i, rval = -1; debug_decl(sudoers_io_open, SUDO_DEBUG_PLUGIN) sudo_conv = conversation; sudo_printf = plugin_printf; /* If we have no command (because -V was specified) just return. */ if (argc == 0) debug_return_bool(true); memset(&details, 0, sizeof(details)); if (fatal_setjmp() != 0) { /* called via fatal(), fatalx() or log_fatal() */ rval = -1; goto done; } bindtextdomain("sudoers", LOCALEDIR); sudo_setpwent(); sudo_setgrent(); /* * Check for debug flags in settings list. */ for (cur = settings; *cur != NULL; cur++) { if (strncmp(*cur, "debug_flags=", sizeof("debug_flags=") - 1) == 0) debug_flags = *cur + sizeof("debug_flags=") - 1; } if (debug_flags != NULL) sudo_debug_init(NULL, debug_flags); /* * Pull iolog settings out of command_info. */ if (!iolog_deserialize_info(&details, user_info, command_info)) { rval = false; goto done; } /* If no I/O log path defined we need to figure it out ourselves. */ if (details.iolog_path == NULL) { /* Get next session ID and convert it into a path. */ tofree = emalloc(sizeof(_PATH_SUDO_IO_LOGDIR) + sizeof(sessid) + 2); memcpy(tofree, _PATH_SUDO_IO_LOGDIR, sizeof(_PATH_SUDO_IO_LOGDIR)); io_nextid(tofree, NULL, sessid); snprintf(tofree + sizeof(_PATH_SUDO_IO_LOGDIR), sizeof(sessid) + 2, "%c%c/%c%c/%c%c", sessid[0], sessid[1], sessid[2], sessid[3], sessid[4], sessid[5]); details.iolog_path = tofree; } /* * Make local copy of I/O log path and create it, along with any * intermediate subdirs. Calls mkdtemp() if iolog_path ends in XXXXXX. */ len = mkdir_iopath(details.iolog_path, pathbuf, sizeof(pathbuf)); if (len >= sizeof(pathbuf)) goto done; /* Write log file with user and command details. */ gettimeofday(&last_time, NULL); write_info_log(pathbuf, len, &details, argv, &last_time); /* Create the timing and I/O log files. */ for (i = 0; i < IOFD_MAX; i++) open_io_fd(pathbuf, len, &io_log_files[i], iolog_compress); /* * Clear I/O log function pointers for disabled log functions. */ if (!io_log_files[IOFD_STDIN].enabled) sudoers_io.log_stdin = NULL; if (!io_log_files[IOFD_STDOUT].enabled) sudoers_io.log_stdout = NULL; if (!io_log_files[IOFD_STDERR].enabled) sudoers_io.log_stderr = NULL; if (!io_log_files[IOFD_TTYIN].enabled) sudoers_io.log_ttyin = NULL; if (!io_log_files[IOFD_TTYOUT].enabled) sudoers_io.log_ttyout = NULL; rval = true; done: fatal_disable_setjmp(); efree(tofree); if (details.runas_pw) sudo_pw_delref(details.runas_pw); sudo_endpwent(); if (details.runas_gr) sudo_gr_delref(details.runas_gr); sudo_endgrent(); debug_return_bool(rval); } static void sudoers_io_close(int exit_status, int error) { int i; debug_decl(sudoers_io_close, SUDO_DEBUG_PLUGIN) if (fatal_setjmp() != 0) { /* called via fatal(), fatalx() or log_fatal() */ fatal_disable_setjmp(); debug_return; } for (i = 0; i < IOFD_MAX; i++) { if (io_log_files[i].fd.v == NULL) continue; #ifdef HAVE_ZLIB_H if (iolog_compress) gzclose(io_log_files[i].fd.g); else #endif fclose(io_log_files[i].fd.f); } debug_return; } static int sudoers_io_version(int verbose) { debug_decl(sudoers_io_version, SUDO_DEBUG_PLUGIN) if (fatal_setjmp() != 0) { /* called via fatal(), fatalx() or log_fatal() */ fatal_disable_setjmp(); debug_return_bool(-1); } sudo_printf(SUDO_CONV_INFO_MSG, "Sudoers I/O plugin version %s\n", PACKAGE_VERSION); debug_return_bool(true); } /* * Generic I/O logging function. Called by the I/O logging entry points. */ static int sudoers_io_log(const char *buf, unsigned int len, int idx) { struct timeval now, delay; debug_decl(sudoers_io_version, SUDO_DEBUG_PLUGIN) gettimeofday(&now, NULL); if (fatal_setjmp() != 0) { /* called via fatal(), fatalx() or log_fatal() */ fatal_disable_setjmp(); debug_return_bool(-1); } #ifdef HAVE_ZLIB_H if (iolog_compress) ignore_result(gzwrite(io_log_files[idx].fd.g, (const voidp)buf, len)); else #endif ignore_result(fwrite(buf, 1, len, io_log_files[idx].fd.f)); sudo_timevalsub(&now, &last_time, &delay); #ifdef HAVE_ZLIB_H if (iolog_compress) gzprintf(io_log_files[IOFD_TIMING].fd.g, "%d %f %u\n", idx, delay.tv_sec + ((double)delay.tv_usec / 1000000), len); else #endif fprintf(io_log_files[IOFD_TIMING].fd.f, "%d %f %u\n", idx, delay.tv_sec + ((double)delay.tv_usec / 1000000), len); last_time.tv_sec = now.tv_sec; last_time.tv_usec = now.tv_usec; debug_return_bool(true); } static int sudoers_io_log_ttyin(const char *buf, unsigned int len) { return sudoers_io_log(buf, len, IOFD_TTYIN); } static int sudoers_io_log_ttyout(const char *buf, unsigned int len) { return sudoers_io_log(buf, len, IOFD_TTYOUT); } static int sudoers_io_log_stdin(const char *buf, unsigned int len) { return sudoers_io_log(buf, len, IOFD_STDIN); } static int sudoers_io_log_stdout(const char *buf, unsigned int len) { return sudoers_io_log(buf, len, IOFD_STDOUT); } static int sudoers_io_log_stderr(const char *buf, unsigned int len) { return sudoers_io_log(buf, len, IOFD_STDERR); } __dso_public struct io_plugin sudoers_io = { SUDO_IO_PLUGIN, SUDO_API_VERSION, sudoers_io_open, sudoers_io_close, sudoers_io_version, sudoers_io_log_ttyin, sudoers_io_log_ttyout, sudoers_io_log_stdin, sudoers_io_log_stdout, sudoers_io_log_stderr };