/* * Copyright (c) 2009-2018 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. */ /* * This is an open source non-commercial project. Dear PVS-Studio, please check it. * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com */ #include #include #include #include #include #ifdef HAVE_STRING_H # include #endif /* HAVE_STRING_H */ #ifdef HAVE_STRINGS_H # include #endif /* HAVE_STRINGS_H */ #include #include #include #include #include #include #include #include "sudoers.h" #include "iolog.h" #include "iolog_files.h" /* 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; bool ignore_iolog_errors; }; static struct iolog_details iolog_details; static bool iolog_compress = false; static bool warned = false; static struct timespec last_time; static unsigned int sessid_max = SESSID_MAX; static mode_t iolog_filemode = S_IRUSR|S_IWUSR; static mode_t iolog_dirmode = S_IRWXU; static bool iolog_gid_set; /* shared with set_perms.c */ uid_t iolog_uid = ROOT_UID; gid_t iolog_gid = ROOT_GID; /* sudoers_io is declared at the end of this file. */ extern __dso_public struct io_plugin sudoers_io; /* * Create directory and any parent directories as needed. */ static bool io_mkdirs(char *path) { struct stat sb; bool ok, uid_changed = false; debug_decl(io_mkdirs, SUDOERS_DEBUG_UTIL) ok = stat(path, &sb) == 0; if (!ok && errno == EACCES) { /* Try again as the I/O log owner (for NFS). */ if (set_perms(PERM_IOLOG)) { ok = stat(path, &sb) == 0; if (!restore_perms()) ok = false; } } if (ok) { if (S_ISDIR(sb.st_mode)) { if (sb.st_uid != iolog_uid || sb.st_gid != iolog_gid) { if (chown(path, iolog_uid, iolog_gid) != 0) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to chown %d:%d %s", __func__, (int)iolog_uid, (int)iolog_gid, path); } } if ((sb.st_mode & ALLPERMS) != iolog_dirmode) { if (chmod(path, iolog_dirmode) != 0) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to chmod 0%o %s", __func__, (int)iolog_dirmode, path); } } } else { sudo_warnx(U_("%s exists but is not a directory (0%o)"), path, (unsigned int) sb.st_mode); ok = false; } goto done; } ok = sudo_mkdir_parents(path, iolog_uid, iolog_gid, iolog_dirmode, true); if (!ok && errno == EACCES) { /* Try again as the I/O log owner (for NFS). */ uid_changed = set_perms(PERM_IOLOG); ok = sudo_mkdir_parents(path, -1, -1, iolog_dirmode, false); } if (ok) { /* Create final path component. */ sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO, "mkdir %s, mode 0%o", path, (unsigned int) iolog_dirmode); ok = mkdir(path, iolog_dirmode) == 0 || errno == EEXIST; if (!ok) { if (errno == EACCES && !uid_changed) { /* Try again as the I/O log owner (for NFS). */ uid_changed = set_perms(PERM_IOLOG); ok = mkdir(path, iolog_dirmode) == 0 || errno == EEXIST; } if (!ok) sudo_warn(U_("unable to mkdir %s"), path); } else { if (chown(path, iolog_uid, iolog_gid) != 0) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to chown %d:%d %s", __func__, (int)iolog_uid, (int)iolog_gid, path); } } } if (uid_changed) { if (!restore_perms()) ok = false; } done: debug_return_bool(ok); } /* * Create temporary directory and any parent directories as needed. */ static bool io_mkdtemp(char *path) { bool ok, uid_changed = false; debug_decl(io_mkdtemp, SUDOERS_DEBUG_UTIL) ok = sudo_mkdir_parents(path, iolog_uid, iolog_gid, iolog_dirmode, true); if (!ok && errno == EACCES) { /* Try again as the I/O log owner (for NFS). */ uid_changed = set_perms(PERM_IOLOG); ok = sudo_mkdir_parents(path, -1, -1, iolog_dirmode, false); } if (ok) { /* Create final path component. */ sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO, "mkdtemp %s", path); /* We cannot retry mkdtemp() so always use PERM_IOLOG */ if (!uid_changed) uid_changed = set_perms(PERM_IOLOG); if (mkdtemp(path) == NULL) { sudo_warn(U_("unable to mkdir %s"), path); ok = false; } else { if (chmod(path, iolog_dirmode) != 0) { sudo_warn(U_("unable to change mode of %s to 0%o"), path, (unsigned int)iolog_dirmode); } } } if (uid_changed) { if (!restore_perms()) ok = false; } debug_return_bool(ok); } /* * Set max session ID (aka sequence number) */ static bool io_set_max_sessid(const char *maxval) { const char *errstr; unsigned int value; debug_decl(io_set_max_sessid, SUDOERS_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); } /* * Sudoers callback for maxseq Defaults setting. */ bool cb_maxseq(const union sudo_defs_val *sd_un) { debug_decl(cb_maxseq, SUDOERS_DEBUG_UTIL) /* Clamp value to SESSID_MAX as documented. */ sessid_max = sd_un->uival < SESSID_MAX ? sd_un->uival : SESSID_MAX; debug_return_bool(true); } /* * Look up I/O log user ID from user name. Sets iolog_uid. * Also sets iolog_gid if iolog_group not specified. */ static bool iolog_set_user(const char *name) { struct passwd *pw; debug_decl(iolog_set_user, SUDOERS_DEBUG_UTIL) if (name != NULL) { pw = sudo_getpwnam(name); if (pw != NULL) { iolog_uid = pw->pw_uid; if (!iolog_gid_set) iolog_gid = pw->pw_gid; sudo_pw_delref(pw); } else { log_warningx(SLOG_SEND_MAIL, N_("unknown user: %s"), name); } } else { /* Reset to default. */ iolog_uid = ROOT_UID; if (!iolog_gid_set) iolog_gid = ROOT_GID; } debug_return_bool(true); } /* * Sudoers callback for iolog_user Defaults setting. */ bool cb_iolog_user(const union sudo_defs_val *sd_un) { return iolog_set_user(sd_un->str); } /* * Look up I/O log group ID from group name. * Sets iolog_gid. */ static bool iolog_set_group(const char *name) { struct group *gr; debug_decl(iolog_set_group, SUDOERS_DEBUG_UTIL) if (name != NULL) { gr = sudo_getgrnam(name); if (gr != NULL) { iolog_gid = gr->gr_gid; iolog_gid_set = true; sudo_gr_delref(gr); } else { log_warningx(SLOG_SEND_MAIL, N_("unknown group: %s"), name); } } else { /* Reset to default. */ iolog_gid = ROOT_GID; iolog_gid_set = false; } debug_return_bool(true); } /* * Look up I/O log group ID from group name. */ bool cb_iolog_group(const union sudo_defs_val *sd_un) { return iolog_set_group(sd_un->str); } /* * Set iolog_filemode and iolog_dirmode. */ static bool iolog_set_mode(mode_t mode) { debug_decl(iolog_set_mode, SUDOERS_DEBUG_UTIL) /* I/O log files must be readable and writable by owner. */ iolog_filemode = S_IRUSR|S_IWUSR; /* Add in group and other read/write if specified. */ iolog_filemode |= mode & (S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH); /* For directory mode, add execute bits as needed. */ iolog_dirmode = iolog_filemode | S_IXUSR; if (iolog_dirmode & (S_IRGRP|S_IWGRP)) iolog_dirmode |= S_IXGRP; if (iolog_dirmode & (S_IROTH|S_IWOTH)) iolog_dirmode |= S_IXOTH; debug_return_bool(true); } /* * Sudoers callback for iolog_mode Defaults setting. */ bool cb_iolog_mode(const union sudo_defs_val *sd_un) { return iolog_set_mode(sd_un->mode); } /* * Wrapper for open(2) that retries with PERM_IOLOG if open(2) * returns EACCES. */ static int io_open(const char *path, int flags, mode_t perm) { int fd; debug_decl(io_open, SUDOERS_DEBUG_UTIL) fd = open(path, flags, perm); if (fd == -1 && errno == EACCES) { /* Try again as the I/O log owner (for NFS). */ if (set_perms(PERM_IOLOG)) { fd = open(path, flags, perm); if (!restore_perms()) { /* restore_perms() warns on error. */ if (fd != -1) { close(fd); fd = -1; } } } } debug_return_int(fd); } /* * 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. */ bool io_nextid(char *iolog_dir, char *iolog_dir_fallback, char sessid[7]) { struct stat sb; char buf[32], *ep; int i, len, fd = -1; unsigned long id = 0; mode_t omask; ssize_t nread; bool ret = false; char pathbuf[PATH_MAX]; static const char b36char[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; debug_decl(io_nextid, SUDOERS_DEBUG_UTIL) /* umask must not be more restrictive than the file modes. */ omask = umask(ACCESSPERMS & ~(iolog_filemode|iolog_dirmode)); /* * Create I/O log directory if it doesn't already exist. */ if (!io_mkdirs(iolog_dir)) goto done; /* * Open sequence file */ len = snprintf(pathbuf, sizeof(pathbuf), "%s/seq", iolog_dir); if (len <= 0 || (size_t)len >= sizeof(pathbuf)) { errno = ENAMETOOLONG; log_warning(SLOG_SEND_MAIL, "%s/seq", pathbuf); goto done; } fd = io_open(pathbuf, O_RDWR|O_CREAT, iolog_filemode); if (fd == -1) { log_warning(SLOG_SEND_MAIL, N_("unable to open %s"), pathbuf); goto done; } sudo_lock_file(fd, SUDO_LOCK); if (fchown(fd, iolog_uid, iolog_gid) != 0) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to fchown %d:%d %s", __func__, (int)iolog_uid, (int)iolog_gid, pathbuf); } /* * 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 = io_open(fallback, O_RDWR|O_CREAT, iolog_filemode); if (fd2 != -1) { if (fchown(fd2, iolog_uid, iolog_gid) != 0) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to fchown %d:%d %s", __func__, (int)iolog_uid, (int)iolog_gid, fallback); } 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_warning(SLOG_SEND_MAIL, N_("unable to read %s"), pathbuf); goto done; } 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. */ #ifdef HAVE_PWRITE if (pwrite(fd, buf, 7, 0) != 7) { #else if (lseek(fd, 0, SEEK_SET) == -1 || write(fd, buf, 7) != 7) { #endif log_warning(SLOG_SEND_MAIL, N_("unable to write to %s"), pathbuf); warned = true; goto done; } ret = true; done: umask(omask); if (fd != -1) close(fd); debug_return_bool(ret); } /* * Copy iolog_path to pathbuf and create the directory and any intermediate * directories. If iolog_path ends in 'XXXXXX', use mkdtemp(). * Returns SIZE_MAX on error. */ static size_t mkdir_iopath(const char *iolog_path, char *pathbuf, size_t pathsize) { size_t len; bool ok; debug_decl(mkdir_iopath, SUDOERS_DEBUG_UTIL) len = strlcpy(pathbuf, iolog_path, pathsize); if (len >= pathsize) { errno = ENAMETOOLONG; log_warning(SLOG_SEND_MAIL, "%s", iolog_path); debug_return_size_t((size_t)-1); } /* * Create path and intermediate subdirs as needed. * If path ends in at least 6 Xs (ala POSIX mktemp), use mkdtemp(). * Sets iolog_gid (if it is not already set) as a side effect. */ if (len >= 6 && strcmp(&pathbuf[len - 6], "XXXXXX") == 0) ok = io_mkdtemp(pathbuf); else ok = io_mkdirs(pathbuf); debug_return_size_t(ok ? len : (size_t)-1); } /* * 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 bool open_io_fd(char *pathbuf, size_t len, struct io_log_file *iol, bool docompress) { debug_decl(open_io_fd, SUDOERS_DEBUG_UTIL) pathbuf[len] = '\0'; strlcat(pathbuf, iol->suffix, PATH_MAX); if (iol->enabled) { int fd = io_open(pathbuf, O_CREAT|O_TRUNC|O_WRONLY, iolog_filemode); if (fd != -1) { if (fchown(fd, iolog_uid, iolog_gid) != 0) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to fchown %d:%d %s", __func__, (int)iolog_uid, (int)iolog_gid, pathbuf); } (void)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 (iol->fd.v == NULL) { close(fd); fd = -1; } } if (fd == -1) { log_warning(SLOG_SEND_MAIL, N_("unable to create %s"), pathbuf); debug_return_bool(false); } } else { /* Remove old log file if we recycled sequence numbers. */ unlink(pathbuf); } debug_return_bool(true); } /* * 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, SUDOERS_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, "ignore_iolog_errors=", sizeof("ignore_iolog_errors=") - 1) == 0) { if (sudo_strtobool(*cur + sizeof("ignore_iolog_errors=") - 1) == true) details->ignore_iolog_errors = true; continue; } 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 (sudo_strtobool(*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 (sudo_strtobool(*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 (sudo_strtobool(*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 (sudo_strtobool(*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 (sudo_strtobool(*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 (sudo_strtobool(*cur + sizeof("iolog_compress=") - 1) == true) iolog_compress = true; /* must be global */ continue; } if (strncmp(*cur, "iolog_mode=", sizeof("iolog_mode=") - 1) == 0) { mode_t mode = sudo_strtomode(*cur + sizeof("iolog_mode=") - 1, &errstr); if (errstr == NULL) iolog_set_mode(mode); continue; } if (strncmp(*cur, "iolog_group=", sizeof("iolog_group=") - 1) == 0) { iolog_set_group(*cur + sizeof("iolog_group=") - 1); continue; } if (strncmp(*cur, "iolog_user=", sizeof("iolog_user=") - 1) == 0) { iolog_set_user(*cur + sizeof("iolog_user=") - 1); continue; } break; case 'm': if (strncmp(*cur, "maxseq=", sizeof("maxseq=") - 1) == 0) { io_set_max_sessid(*cur + sizeof("maxseq=") - 1); continue; } 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 = sudo_strtoid(runas_uid_str, NULL, NULL, &errstr); if (errstr != NULL) sudo_warnx("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 = sudo_strtoid(runas_gid_str, NULL, NULL, &errstr); if (errstr != NULL) sudo_warnx("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. * This file is not compressed. */ static bool write_info_log(char *pathbuf, size_t len, struct iolog_details *details, char * const argv[]) { time_t now; char * const *av; FILE *fp; int fd; bool ret = true; debug_decl(write_info_log, SUDOERS_DEBUG_UTIL) pathbuf[len] = '\0'; strlcat(pathbuf, "/log", PATH_MAX); fd = io_open(pathbuf, O_CREAT|O_TRUNC|O_WRONLY, iolog_filemode); if (fd == -1 || (fp = fdopen(fd, "w")) == NULL) { log_warning(SLOG_SEND_MAIL, N_("unable to create %s"), pathbuf); debug_return_bool(false); } if (fchown(fd, iolog_uid, iolog_gid) != 0) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to fchown %d:%d %s", __func__, (int)iolog_uid, (int)iolog_gid, pathbuf); } fprintf(fp, "%lld:%s:%s:%s:%s:%d:%d\n%s\n%s", (long long)time(&now), 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); fflush(fp); if (ferror(fp)) { log_warning(SLOG_SEND_MAIL, N_("unable to write to I/O log file: %s"), strerror(errno)); warned = true; ret = false; } fclose(fp); debug_return_bool(ret); } #ifdef HAVE_ZLIB_H static const char * gzstrerror(gzFile file) { int errnum; return gzerror(file, &errnum); } #endif /* HAVE_ZLIB_H */ /* * Write to an I/O log, compressing if iolog_compress is enabled. * If def_iolog_flush is true, flush the buffer immediately. */ static const char * iolog_write(union io_fd ifd, const void *buf, unsigned int len) { const char *errstr = NULL; debug_decl(iolog_write, SUDOERS_DEBUG_PLUGIN) #ifdef HAVE_ZLIB_H if (iolog_compress) { if (gzwrite(ifd.g, (const voidp)buf, len) != (int)len) { errstr = gzstrerror(ifd.g); goto done; } if (def_iolog_flush) { if (gzflush(ifd.g, Z_SYNC_FLUSH) != Z_OK) { errstr = gzstrerror(ifd.g); goto done; } } } else #endif { if (fwrite(buf, 1, len, ifd.f) != len) { errstr = strerror(errno); goto done; } if (def_iolog_flush) { if (fflush(ifd.f) != 0) { errstr = strerror(errno); goto done; } } } done: debug_return_const_str(errstr); } 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 sudo_conf_debug_file_list debug_files = TAILQ_HEAD_INITIALIZER(debug_files); char pathbuf[PATH_MAX], sessid[7]; char *tofree = NULL; char * const *cur; const char *cp, *plugin_path = NULL; size_t len; mode_t omask; int i, ret = -1; debug_decl(sudoers_io_open, SUDOERS_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_int(true); bindtextdomain("sudoers", LOCALEDIR); /* Initialize the debug subsystem. */ for (cur = settings; (cp = *cur) != NULL; cur++) { if (strncmp(cp, "debug_flags=", sizeof("debug_flags=") - 1) == 0) { cp += sizeof("debug_flags=") - 1; if (!sudoers_debug_parse_flags(&debug_files, cp)) debug_return_int(-1); continue; } if (strncmp(cp, "plugin_path=", sizeof("plugin_path=") - 1) == 0) { plugin_path = cp + sizeof("plugin_path=") - 1; continue; } } /* umask must not be more restrictive than the file modes. */ omask = umask(ACCESSPERMS & ~(iolog_filemode|iolog_dirmode)); if (!sudoers_debug_register(plugin_path, &debug_files)) { ret = -1; goto done; } /* * Pull iolog settings out of command_info. */ if (!iolog_deserialize_info(&iolog_details, user_info, command_info)) { ret = false; goto done; } /* If no I/O log path defined we need to figure it out ourselves. */ if (iolog_details.iolog_path == NULL) { /* Get next session ID and convert it into a path. */ tofree = malloc(sizeof(_PATH_SUDO_IO_LOGDIR) + sizeof(sessid) + 2); if (tofree == NULL) { sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory")); goto done; } memcpy(tofree, _PATH_SUDO_IO_LOGDIR, sizeof(_PATH_SUDO_IO_LOGDIR)); if (!io_nextid(tofree, NULL, sessid)) { ret = false; goto done; } 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]); iolog_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(iolog_details.iolog_path, pathbuf, sizeof(pathbuf)); if (len >= sizeof(pathbuf)) goto done; /* Write log file with user and command details. */ if (!write_info_log(pathbuf, len, &iolog_details, argv)) goto done; /* Create the timing and I/O log files. */ for (i = 0; i < IOFD_MAX; i++) { if (!open_io_fd(pathbuf, len, &io_log_files[i], iolog_compress)) goto done; } /* * 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; if (sudo_gettime_awake(&last_time) == -1) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to get time of day", __func__); goto done; } ret = true; done: umask(omask); free(tofree); if (iolog_details.runas_pw) sudo_pw_delref(iolog_details.runas_pw); if (iolog_details.runas_gr) sudo_gr_delref(iolog_details.runas_gr); sudo_freepwcache(); sudo_freegrcache(); /* Ignore errors if they occur if the policy says so. */ if (ret == -1 && iolog_details.ignore_iolog_errors) ret = 0; debug_return_int(ret); } static void sudoers_io_close(int exit_status, int error) { const char *errstr = NULL; int i; debug_decl(sudoers_io_close, SUDOERS_DEBUG_PLUGIN) for (i = 0; i < IOFD_MAX; i++) { if (io_log_files[i].fd.v == NULL) continue; #ifdef HAVE_ZLIB_H if (iolog_compress) { int errnum; if (gzclose(io_log_files[i].fd.g) != Z_OK) errstr = gzerror(io_log_files[i].fd.g, &errnum); } else #endif if (fclose(io_log_files[i].fd.f) != 0) errstr = strerror(errno); } if (errstr != NULL && !warned) { /* Only warn about I/O log file errors once. */ log_warning(SLOG_SEND_MAIL, N_("unable to write to I/O log file: %s"), errstr); warned = true; } sudoers_debug_deregister(); return; } static int sudoers_io_version(int verbose) { debug_decl(sudoers_io_version, SUDOERS_DEBUG_PLUGIN) sudo_printf(SUDO_CONV_INFO_MSG, "Sudoers I/O plugin version %s\n", PACKAGE_VERSION); debug_return_int(true); } /* * Generic I/O logging function. Called by the I/O logging entry points. * Returns 1 on success and -1 on error. */ static int sudoers_io_log(union io_fd ifd, const char *buf, unsigned int len, int event) { struct timespec now, delay; char tbuf[1024]; const char *errstr = NULL; int ret = -1; debug_decl(sudoers_io_log, SUDOERS_DEBUG_PLUGIN) if (ifd.v == NULL) { sudo_warnx(U_("%s: internal error, I/O log file for event %d not open"), __func__, event); debug_return_int(-1); } if (sudo_gettime_awake(&now) == -1) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to get time of day", __func__); errstr = strerror(errno); goto bad; } /* Write I/O log file entry. */ errstr = iolog_write(ifd, buf, len); if (errstr != NULL) goto done; /* Write timing file entry. */ sudo_timespecsub(&now, &last_time, &delay); len = (unsigned int)snprintf(tbuf, sizeof(tbuf), "%d %lld.%09ld %u\n", event, (long long)delay.tv_sec, delay.tv_nsec, len); if (len >= sizeof(tbuf)) { /* Not actually possible due to the size of tbuf[]. */ errstr = strerror(EOVERFLOW); goto done; } errstr = iolog_write(io_log_files[IOFD_TIMING].fd, tbuf, len); if (errstr != NULL) goto done; /* Success. */ ret = 1; done: last_time.tv_sec = now.tv_sec; last_time.tv_nsec = now.tv_nsec; bad: if (ret == -1) { if (errstr != NULL && !warned) { /* Only warn about I/O log file errors once. */ log_warning(SLOG_SEND_MAIL, N_("unable to write to I/O log file: %s"), errstr); warned = true; } /* Ignore errors if they occur if the policy says so. */ if (iolog_details.ignore_iolog_errors) ret = 1; } debug_return_int(ret); } static int sudoers_io_log_stdin(const char *buf, unsigned int len) { const union io_fd ifd = io_log_files[IOFD_STDIN].fd; return sudoers_io_log(ifd, buf, len, IO_EVENT_STDIN); } static int sudoers_io_log_stdout(const char *buf, unsigned int len) { const union io_fd ifd = io_log_files[IOFD_STDOUT].fd; return sudoers_io_log(ifd, buf, len, IO_EVENT_STDOUT); } static int sudoers_io_log_stderr(const char *buf, unsigned int len) { const union io_fd ifd = io_log_files[IOFD_STDERR].fd; return sudoers_io_log(ifd, buf, len, IO_EVENT_STDERR); } static int sudoers_io_log_ttyin(const char *buf, unsigned int len) { const union io_fd ifd = io_log_files[IOFD_TTYIN].fd; return sudoers_io_log(ifd, buf, len, IO_EVENT_TTYIN); } static int sudoers_io_log_ttyout(const char *buf, unsigned int len) { const union io_fd ifd = io_log_files[IOFD_TTYOUT].fd; return sudoers_io_log(ifd, buf, len, IO_EVENT_TTYOUT); } static int sudoers_io_change_winsize(unsigned int lines, unsigned int cols) { struct timespec now, delay; unsigned int len; char tbuf[1024]; const char *errstr = NULL; int ret = -1; debug_decl(sudoers_io_change_winsize, SUDOERS_DEBUG_PLUGIN) if (sudo_gettime_awake(&now) == -1) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to get time of day", __func__); errstr = strerror(errno); goto bad; } /* Write window change event to the timing file. */ sudo_timespecsub(&now, &last_time, &delay); len = (unsigned int)snprintf(tbuf, sizeof(tbuf), "%d %lld.%09ld %u %u\n", IO_EVENT_WINSIZE, (long long)delay.tv_sec, delay.tv_nsec, lines, cols); if (len >= sizeof(tbuf)) { /* Not actually possible due to the size of tbuf[]. */ errstr = strerror(EOVERFLOW); goto done; } errstr = iolog_write(io_log_files[IOFD_TIMING].fd, tbuf, len); if (errstr != NULL) goto done; /* Success. */ ret = 1; done: last_time.tv_sec = now.tv_sec; last_time.tv_nsec = now.tv_nsec; bad: if (ret == -1) { if (errstr != NULL && !warned) { /* Only warn about I/O log file errors once. */ log_warning(SLOG_SEND_MAIL, N_("unable to write to I/O log file: %s"), errstr); warned = true; } /* Ignore errors if they occur if the policy says so. */ if (iolog_details.ignore_iolog_errors) ret = 1; } debug_return_int(ret); } static int sudoers_io_suspend(int signo) { struct timespec now, delay; unsigned int len; char tbuf[1024]; const char *errstr = NULL; int ret = -1; debug_decl(sudoers_io_suspend, SUDOERS_DEBUG_PLUGIN) if (signo <= 0) { sudo_warnx(U_("%s: internal error, invalid signal %d"), __func__, signo); debug_return_int(-1); } if (sudo_gettime_awake(&now) == -1) { sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO, "%s: unable to get time of day", __func__); errstr = strerror(errno); goto bad; } /* Write suspend event to the timing file. */ sudo_timespecsub(&now, &last_time, &delay); len = (unsigned int)snprintf(tbuf, sizeof(tbuf), "%d %lld.%09ld %d\n", IO_EVENT_SUSPEND, (long long)delay.tv_sec, delay.tv_nsec, signo); if (len >= sizeof(tbuf)) { /* Not actually possible due to the size of tbuf[]. */ errstr = strerror(EOVERFLOW); goto done; } errstr = iolog_write(io_log_files[IOFD_TIMING].fd, tbuf, len); if (errstr != NULL) goto done; /* Success. */ ret = 1; done: last_time.tv_sec = now.tv_sec; last_time.tv_nsec = now.tv_nsec; bad: if (ret == -1) { if (errstr != NULL && !warned) { /* Only warn about I/O log file errors once. */ log_warning(SLOG_SEND_MAIL, N_("unable to write to I/O log file: %s"), errstr); warned = true; } /* Ignore errors if they occur if the policy says so. */ if (iolog_details.ignore_iolog_errors) ret = 1; } debug_return_int(ret); } __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, NULL, /* register_hooks */ NULL, /* deregister_hooks */ sudoers_io_change_winsize, sudoers_io_suspend };