diff options
Diffstat (limited to 'lib/util/sudo_debug.c')
| -rw-r--r-- | lib/util/sudo_debug.c | 1167 |
1 files changed, 1167 insertions, 0 deletions
diff --git a/lib/util/sudo_debug.c b/lib/util/sudo_debug.c new file mode 100644 index 0000000..c06ba8c --- /dev/null +++ b/lib/util/sudo_debug.c @@ -0,0 +1,1167 @@ +/* + * SPDX-License-Identifier: ISC + * + * Copyright (c) 2011-2017 Todd C. Miller <Todd.Miller@sudo.ws> + * + * 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 <config.h> + +#include <sys/stat.h> +#include <sys/time.h> +#include <sys/uio.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#ifdef HAVE_STRINGS_H +# include <strings.h> +#endif /* HAVE_STRINGS_H */ +#include <unistd.h> +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <time.h> + +#include "sudo_compat.h" +#include "sudo_conf.h" +#include "sudo_debug.h" +#include "sudo_fatal.h" +#include "sudo_gettext.h" +#include "sudo_plugin.h" +#include "sudo_util.h" + +#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION +/* + * The debug priorities and subsystems are currently hard-coded. + * In the future we might consider allowing plugins to register their + * own subsystems and provide direct access to the debugging API. + */ + +/* Note: this must match the order in sudo_debug.h */ +static const char *const sudo_debug_priorities[] = { + "crit", + "err", + "warn", + "notice", + "diag", + "info", + "trace", + "debug", + NULL +}; + +/* Note: this must match the order in sudo_debug.h */ +static const char *const sudo_debug_default_subsystems[] = { + "args", + "conv", + "edit", + "event", + "exec", + "hooks", + "main", + "netif", + "pcomm", + "plugin", + "pty", + "selinux", + "util", + "utmp", + NULL +}; + +#define NUM_DEF_SUBSYSTEMS (nitems(sudo_debug_default_subsystems) - 1) + +/* + * For multiple programs/plugins there is a per-program instance + * and one or more outputs (files). + */ +struct sudo_debug_output { + SLIST_ENTRY(sudo_debug_output) entries; + char *filename; + int *settings; + int fd; +}; +SLIST_HEAD(sudo_debug_output_list, sudo_debug_output); +struct sudo_debug_instance { + char *program; + const char *const *subsystems; + const unsigned int *subsystem_ids; + unsigned int max_subsystem; + unsigned int refcnt; + struct sudo_debug_output_list outputs; +}; + +/* Support up to 10 instances. */ +#define SUDO_DEBUG_INSTANCE_MAX 10 +static struct sudo_debug_instance *sudo_debug_instances[SUDO_DEBUG_INSTANCE_MAX]; +static int sudo_debug_last_instance = -1; + +static char sudo_debug_pidstr[(((sizeof(int) * 8) + 2) / 3) + 3]; +static size_t sudo_debug_pidlen; + +#define round_nfds(_n) (((_n) + (4 * NBBY) - 1) & ~((4 * NBBY) - 1)) +static int sudo_debug_fds_size; +static unsigned char *sudo_debug_fds; +static int sudo_debug_max_fd = -1; + +/* Default instance index to use for common utility functions. */ +static int sudo_debug_active_instance = -1; + +/* + * Free the specified output structure. + */ +static void +sudo_debug_free_output(struct sudo_debug_output *output) +{ + free(output->filename); + free(output->settings); + if (output->fd != -1) + close(output->fd); + free(output); +} + +/* + * Create a new output file for the specified debug instance. + * Returns NULL if the file cannot be opened or memory cannot be allocated. + * XXX - check for duplicates + */ +static struct sudo_debug_output * +sudo_debug_new_output(struct sudo_debug_instance *instance, + struct sudo_debug_file *debug_file, int minfd) +{ + char *buf, *cp, *last, *subsys, *pri; + struct sudo_debug_output *output; + unsigned int j; + int i; + + /* Create new output for the instance. */ + /* XXX - reuse fd for existing filename? */ + output = calloc(1, sizeof(*output)); + if (output == NULL) + goto oom; + output->fd = -1; + output->settings = reallocarray(NULL, instance->max_subsystem + 1, + sizeof(int)); + if (output->settings == NULL) + goto oom; + output->filename = strdup(debug_file->debug_file); + if (output->filename == NULL) + goto oom; + + /* Init per-subsystems settings to -1 since 0 is a valid priority. */ + for (j = 0; j <= instance->max_subsystem; j++) + output->settings[j] = -1; + + /* Open debug file. */ + output->fd = open(output->filename, O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR); + if (output->fd == -1) { + /* Create debug file as needed and set group ownership. */ + if (errno == ENOENT) { + output->fd = open(output->filename, O_WRONLY|O_APPEND|O_CREAT, + S_IRUSR|S_IWUSR); + } + if (output->fd == -1) { + sudo_warn_nodebug("%s", output->filename); + goto bad; + } + ignore_result(fchown(output->fd, (uid_t)-1, 0)); + } + if (output->fd < minfd) { + int newfd = fcntl(output->fd, F_DUPFD, minfd); + if (newfd == -1) { + sudo_warn_nodebug("%s", output->filename); + goto bad; + } + close(output->fd); + output->fd = newfd; + } + if (fcntl(output->fd, F_SETFD, FD_CLOEXEC) == -1) { + sudo_warn_nodebug("%s", output->filename); + goto bad; + } + if (sudo_debug_fds_size < output->fd) { + /* Bump fds size to the next multiple of 4 * NBBY. */ + const int old_size = sudo_debug_fds_size / NBBY; + const int new_size = round_nfds(output->fd + 1) / NBBY; + unsigned char *new_fds; + + new_fds = realloc(sudo_debug_fds, new_size); + if (new_fds == NULL) + goto oom; + memset(new_fds + old_size, 0, new_size - old_size); + sudo_debug_fds = new_fds; + sudo_debug_fds_size = new_size * NBBY; + } + sudo_setbit(sudo_debug_fds, output->fd); + if (output->fd > sudo_debug_max_fd) + sudo_debug_max_fd = output->fd; + + /* Parse Debug conf string. */ + buf = strdup(debug_file->debug_flags); + if (buf == NULL) + goto oom; + for ((cp = strtok_r(buf, ",", &last)); cp != NULL; (cp = strtok_r(NULL, ",", &last))) { + /* Should be in the form subsys@pri. */ + subsys = cp; + if ((pri = strchr(cp, '@')) == NULL) + continue; + *pri++ = '\0'; + + /* Look up priority and subsystem, fill in sudo_debug_settings[]. */ + for (i = 0; sudo_debug_priorities[i] != NULL; i++) { + if (strcasecmp(pri, sudo_debug_priorities[i]) == 0) { + for (j = 0; instance->subsystems[j] != NULL; j++) { + if (strcasecmp(subsys, "all") == 0) { + const unsigned int idx = instance->subsystem_ids ? + SUDO_DEBUG_SUBSYS(instance->subsystem_ids[j]) : j; + if (i > output->settings[idx]) + output->settings[idx] = i; + continue; + } + if (strcasecmp(subsys, instance->subsystems[j]) == 0) { + const unsigned int idx = instance->subsystem_ids ? + SUDO_DEBUG_SUBSYS(instance->subsystem_ids[j]) : j; + if (i > output->settings[idx]) + output->settings[idx] = i; + break; + } + } + break; + } + } + } + free(buf); + + return output; +oom: + // -V:sudo_warn_nodebug:575, 618 + sudo_warn_nodebug(NULL); +bad: + if (output != NULL) + sudo_debug_free_output(output); + return NULL; +} + +/* + * Register a program/plugin with the debug framework, + * parses settings string from sudo.conf and opens debug_files. + * If subsystem names are specified they override the default values. + * NOTE: subsystems must not be freed by caller unless deregistered. + * Sets the active instance to the newly registered instance. + * Returns instance index on success, SUDO_DEBUG_INSTANCE_INITIALIZER + * if no debug files are specified and SUDO_DEBUG_INSTANCE_ERROR + * on error. + */ +int +sudo_debug_register_v2(const char *program, const char *const subsystems[], + unsigned int ids[], struct sudo_conf_debug_file_list *debug_files, + int minfd) +{ + struct sudo_debug_instance *instance = NULL; + struct sudo_debug_output *output; + struct sudo_debug_file *debug_file; + int idx, free_idx = -1; + debug_decl_func(sudo_debug_register); + + if (debug_files == NULL) + return SUDO_DEBUG_INSTANCE_INITIALIZER; + + /* Use default subsystem names if none are provided. */ + if (subsystems == NULL) { + subsystems = sudo_debug_default_subsystems; + } else if (ids == NULL) { + /* If subsystems are specified we must have ids[] too. */ + return SUDO_DEBUG_INSTANCE_ERROR; + } + + /* Search for existing instance. */ + for (idx = 0; idx <= sudo_debug_last_instance; idx++) { + if (sudo_debug_instances[idx] == NULL) { + free_idx = idx; + continue; + } + if (sudo_debug_instances[idx]->subsystems == subsystems && + strcmp(sudo_debug_instances[idx]->program, program) == 0) { + instance = sudo_debug_instances[idx]; + break; + } + } + + if (instance == NULL) { + unsigned int i, j, max_id = NUM_DEF_SUBSYSTEMS - 1; + + /* Fill in subsystem name -> id mapping as needed. */ + if (ids != NULL) { + for (i = 0; subsystems[i] != NULL; i++) { + /* Check default subsystems. */ + for (j = 0; j < NUM_DEF_SUBSYSTEMS; j++) { + if (strcmp(subsystems[i], sudo_debug_default_subsystems[j]) == 0) + break; + } + if (j == NUM_DEF_SUBSYSTEMS) + j = ++max_id; + ids[i] = ((j + 1) << 6); + } + } + + if (free_idx != -1) + idx = free_idx; + if (idx == SUDO_DEBUG_INSTANCE_MAX) { + /* XXX - realloc? */ + sudo_warnx_nodebug("too many debug instances (max %d)", SUDO_DEBUG_INSTANCE_MAX); + return SUDO_DEBUG_INSTANCE_ERROR; + } + if (idx != sudo_debug_last_instance + 1 && idx != free_idx) { + sudo_warnx_nodebug("%s: instance number mismatch: expected %d or %d, got %d", __func__, sudo_debug_last_instance + 1, free_idx, idx); + return SUDO_DEBUG_INSTANCE_ERROR; + } + if ((instance = malloc(sizeof(*instance))) == NULL) + return SUDO_DEBUG_INSTANCE_ERROR; + if ((instance->program = strdup(program)) == NULL) { + free(instance); + return SUDO_DEBUG_INSTANCE_ERROR; + } + instance->subsystems = subsystems; + instance->subsystem_ids = ids; + instance->max_subsystem = max_id; + instance->refcnt = 1; + SLIST_INIT(&instance->outputs); + sudo_debug_instances[idx] = instance; + if (idx != free_idx) + sudo_debug_last_instance++; + } else { + /* Check for matching instance but different ids[]. */ + if (ids != NULL && instance->subsystem_ids != ids) { + unsigned int i; + + for (i = 0; subsystems[i] != NULL; i++) + ids[i] = instance->subsystem_ids[i]; + } + instance->refcnt++; + } + + TAILQ_FOREACH(debug_file, debug_files, entries) { + output = sudo_debug_new_output(instance, debug_file, minfd); + if (output != NULL) + SLIST_INSERT_HEAD(&instance->outputs, output, entries); + } + + /* Set active instance. */ + sudo_debug_active_instance = idx; + + /* Stash the pid string so we only have to format it once. */ + if (sudo_debug_pidlen == 0) { + (void)snprintf(sudo_debug_pidstr, sizeof(sudo_debug_pidstr), "[%d] ", + (int)getpid()); + sudo_debug_pidlen = strlen(sudo_debug_pidstr); + } + + return idx; +} + +int +sudo_debug_register_v1(const char *program, const char *const subsystems[], + unsigned int ids[], struct sudo_conf_debug_file_list *debug_files) +{ + return sudo_debug_register_v2(program, subsystems, ids, debug_files, -1); +} + +/* + * De-register the specified instance from the debug subsystem + * and free up any associated data structures. + * Returns the number of remaining references for the instance or -1 on error. + */ +int +sudo_debug_deregister_v1(int idx) +{ + struct sudo_debug_instance *instance; + struct sudo_debug_output *output, *next; + debug_decl_func(sudo_debug_deregister); + + if (idx < 0 || idx > sudo_debug_last_instance) { + sudo_warnx_nodebug("%s: invalid instance ID %d, max %d", + __func__, idx, sudo_debug_last_instance); + return -1; + } + /* Reset active instance as needed. */ + if (sudo_debug_active_instance == idx) + sudo_debug_active_instance = -1; + + instance = sudo_debug_instances[idx]; + if (instance == NULL) + return -1; /* already deregistered */ + + if (--instance->refcnt != 0) + return instance->refcnt; /* ref held by other caller */ + + /* Free up instance data, note that subsystems[] is owned by caller. */ + sudo_debug_instances[idx] = NULL; + SLIST_FOREACH_SAFE(output, &instance->outputs, entries, next) { + close(output->fd); + free(output->filename); + free(output->settings); + free(output); + } + free(instance->program); + free(instance); + + if (idx == sudo_debug_last_instance) + sudo_debug_last_instance--; + + return 0; +} + +/* + * Parse the "filename flags,..." debug_flags entry from sudo.conf + * and insert a new sudo_debug_file struct into the list. + * Returns 0 on success, 1 on parse error or -1 on malloc failure. + */ +int +sudo_debug_parse_flags_v1(struct sudo_conf_debug_file_list *debug_files, + const char *entry) +{ + struct sudo_debug_file *debug_file; + const char *filename, *flags; + size_t namelen; + + /* Only process new-style debug flags: filename flags,... */ + filename = entry; + if (*filename != '/' || (flags = strpbrk(filename, " \t")) == NULL) + return 1; + namelen = (size_t)(flags - filename); + while (isblank((unsigned char)*flags)) + flags++; + if (*flags != '\0') { + if ((debug_file = calloc(1, sizeof(*debug_file))) == NULL) + goto oom; + if ((debug_file->debug_file = strndup(filename, namelen)) == NULL) + goto oom; + if ((debug_file->debug_flags = strdup(flags)) == NULL) + goto oom; + TAILQ_INSERT_TAIL(debug_files, debug_file, entries); + } + return 0; +oom: + if (debug_file != NULL) { + free(debug_file->debug_file); + free(debug_file->debug_flags); + free(debug_file); + } + return -1; +} + +int +sudo_debug_get_instance_v1(const char *program) +{ + int idx; + + for (idx = 0; idx <= sudo_debug_last_instance; idx++) { + if (sudo_debug_instances[idx] == NULL) + continue; + if (strcmp(sudo_debug_instances[idx]->program, program) == 0) + return idx; + } + return SUDO_DEBUG_INSTANCE_INITIALIZER; +} + +pid_t +sudo_debug_fork_v1(void) +{ + pid_t pid; + + if ((pid = fork()) == 0) { + (void)snprintf(sudo_debug_pidstr, sizeof(sudo_debug_pidstr), "[%d] ", + (int)getpid()); + sudo_debug_pidlen = strlen(sudo_debug_pidstr); + } + + return pid; +} + +void +sudo_debug_enter_v1(const char *func, const char *file, int line, + int subsys) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "-> %s @ %s:%d", func, file, line); +} + +void +sudo_debug_exit_v1(const char *func, const char *file, int line, + int subsys) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d", func, file, line); +} + +void +sudo_debug_exit_int_v1(const char *func, const char *file, int line, + int subsys, int ret) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %d", func, file, line, ret); +} + +void +sudo_debug_exit_long_v1(const char *func, const char *file, int line, + int subsys, long ret) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %ld", func, file, line, ret); +} + +void +sudo_debug_exit_id_t_v1(const char *func, const char *file, int line, + int subsys, id_t ret) +{ +#if SIZEOF_ID_T == 8 + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %lld", func, file, line, (long long)ret); +#else + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %d", func, file, line, (int)ret); +#endif +} + +void +sudo_debug_exit_size_t_v1(const char *func, const char *file, int line, + int subsys, size_t ret) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %zu", func, file, line, ret); +} + +void +sudo_debug_exit_ssize_t_v1(const char *func, const char *file, int line, + int subsys, ssize_t ret) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %zd", func, file, line, ret); +} + +void +sudo_debug_exit_time_t_v1(const char *func, const char *file, int line, + int subsys, time_t ret) +{ +#if SIZEOF_TIME_T == 8 + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %lld", func, file, line, (long long)ret); +#else + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %d", func, file, line, (int)ret); +#endif +} + +void +sudo_debug_exit_bool_v1(const char *func, const char *file, int line, + int subsys, bool ret) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %s", func, file, line, ret ? "true" : "false"); +} + +void +sudo_debug_exit_str_v1(const char *func, const char *file, int line, + int subsys, const char *ret) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %s", func, file, line, ret ? ret : "(null)"); +} + +void +sudo_debug_exit_str_masked_v1(const char *func, const char *file, int line, + int subsys, const char *ret) +{ + static const char stars[] = "********************************************************************************"; + int len = ret ? strlen(ret) : sizeof("(null)") - 1; + + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %.*s", func, file, line, len, ret ? stars : "(null)"); +} + +void +sudo_debug_exit_ptr_v1(const char *func, const char *file, int line, + int subsys, const void *ret) +{ + sudo_debug_printf2(NULL, NULL, 0, subsys | SUDO_DEBUG_TRACE, + "<- %s @ %s:%d := %p", func, file, line, ret); +} + +void +sudo_debug_write2_v1(int fd, const char *func, const char *file, int lineno, + const char *str, int len, int errnum) +{ + char numbuf[(((sizeof(int) * 8) + 2) / 3) + 2]; + char timebuf[64]; + struct timeval tv; + struct iovec iov[12]; + int iovcnt = 3; + + /* Cannot use sudo_gettime_real() here since it calls sudo_debug. */ + timebuf[0] = '\0'; + if (gettimeofday(&tv, NULL) != -1) { + time_t now = tv.tv_sec; + struct tm tm; + size_t tlen; + if (localtime_r(&now, &tm) != NULL) { + timebuf[sizeof(timebuf) - 1] = '\0'; + tlen = strftime(timebuf, sizeof(timebuf), "%b %e %H:%M:%S", &tm); + if (tlen == 0 || timebuf[sizeof(timebuf) - 1] != '\0') { + /* contents are undefined on error */ + timebuf[0] = '\0'; + } else { + (void)snprintf(timebuf + tlen, sizeof(timebuf) - tlen, + ".%03d ", (int)tv.tv_usec / 1000); + } + } + } + iov[0].iov_base = timebuf; + iov[0].iov_len = strlen(timebuf); + + /* Prepend program name and pid with a trailing space. */ + iov[1].iov_base = (char *)getprogname(); + iov[1].iov_len = strlen(iov[1].iov_base); + iov[2].iov_base = sudo_debug_pidstr; + iov[2].iov_len = sudo_debug_pidlen; + + /* Add string, trimming any trailing newlines. */ + while (len > 0 && str[len - 1] == '\n') + len--; + if (len > 0) { + iov[iovcnt].iov_base = (char *)str; + iov[iovcnt].iov_len = len; + iovcnt++; + } + + /* Append error string if errno is specified. */ + if (errnum) { + if (len > 0) { + iov[iovcnt].iov_base = (char *)": "; + iov[iovcnt].iov_len = 2; + iovcnt++; + } + iov[iovcnt].iov_base = strerror(errnum); + iov[iovcnt].iov_len = strlen(iov[iovcnt].iov_base); + iovcnt++; + } + + /* If function, file and lineno are specified, append them. */ + if (func != NULL && file != NULL && lineno != 0) { + iov[iovcnt].iov_base = (char *)" @ "; + iov[iovcnt].iov_len = 3; + iovcnt++; + + iov[iovcnt].iov_base = (char *)func; + iov[iovcnt].iov_len = strlen(func); + iovcnt++; + + iov[iovcnt].iov_base = (char *)"() "; + iov[iovcnt].iov_len = 3; + iovcnt++; + + iov[iovcnt].iov_base = (char *)file; + iov[iovcnt].iov_len = strlen(file); + iovcnt++; + + (void)snprintf(numbuf, sizeof(numbuf), ":%d", lineno); + iov[iovcnt].iov_base = numbuf; + iov[iovcnt].iov_len = strlen(numbuf); + iovcnt++; + } + + /* Append newline. */ + iov[iovcnt].iov_base = (char *)"\n"; + iov[iovcnt].iov_len = 1; + iovcnt++; + + /* Write message in a single syscall */ + ignore_result(writev(fd, iov, iovcnt)); +} + +bool +sudo_debug_needed_v1(int level) +{ + unsigned int subsys; + int pri; + struct sudo_debug_instance *instance; + struct sudo_debug_output *output; + bool result = false; + + if (sudo_debug_active_instance == -1) + goto out; + + /* Extract priority and subsystem from level. */ + pri = SUDO_DEBUG_PRI(level); + subsys = (unsigned int)SUDO_DEBUG_SUBSYS(level); + + if (sudo_debug_active_instance > sudo_debug_last_instance) + goto out; + + instance = sudo_debug_instances[sudo_debug_active_instance]; + if (instance == NULL) + goto out; + + if (subsys <= instance->max_subsystem) { + SLIST_FOREACH(output, &instance->outputs, entries) { + if (output->settings[subsys] >= pri) { + result = true; + break; + } + } + } +out: + return result; +} + +void +sudo_debug_vprintf2_v1(const char *func, const char *file, int lineno, int level, + const char *fmt, va_list ap) +{ + int buflen, pri, saved_errno = errno; + unsigned int subsys; + char static_buf[1024], *buf = static_buf; + struct sudo_debug_instance *instance; + struct sudo_debug_output *output; + debug_decl_func(sudo_debug_vprintf2); + + if (sudo_debug_active_instance == -1) + goto out; + + /* Extract priority and subsystem from level. */ + pri = SUDO_DEBUG_PRI(level); + subsys = SUDO_DEBUG_SUBSYS(level); + + /* Find matching instance. */ + if (sudo_debug_active_instance > sudo_debug_last_instance) { + sudo_warnx_nodebug("%s: invalid instance ID %d, max %d", + __func__, sudo_debug_active_instance, sudo_debug_last_instance); + goto out; + } + instance = sudo_debug_instances[sudo_debug_active_instance]; + if (instance == NULL) { + sudo_warnx_nodebug("%s: unregistered instance index %d", __func__, + sudo_debug_active_instance); + goto out; + } + + SLIST_FOREACH(output, &instance->outputs, entries) { + /* Make sure we want debug info at this level. */ + if (subsys <= instance->max_subsystem && output->settings[subsys] >= pri) { + va_list ap2; + + /* Operate on a copy of ap to support multiple outputs. */ + va_copy(ap2, ap); + buflen = fmt ? vsnprintf(static_buf, sizeof(static_buf), fmt, ap2) : 0; + va_end(ap2); + if (buflen >= ssizeof(static_buf)) { + va_list ap3; + + /* Not enough room in static buf, allocate dynamically. */ + va_copy(ap3, ap); + buflen = vasprintf(&buf, fmt, ap3); + va_end(ap3); + } + if (buflen != -1) { + int errcode = ISSET(level, SUDO_DEBUG_ERRNO) ? saved_errno : 0; + if (ISSET(level, SUDO_DEBUG_LINENO)) + sudo_debug_write2(output->fd, func, file, lineno, buf, buflen, errcode); + else + sudo_debug_write2(output->fd, NULL, NULL, 0, buf, buflen, errcode); + if (buf != static_buf) { + free(buf); + buf = static_buf; + } + } + } + } +out: + errno = saved_errno; +} + +#ifdef NO_VARIADIC_MACROS +void +sudo_debug_printf_nvm_v1(int pri, const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + sudo_debug_vprintf2(NULL, NULL, 0, pri, fmt, ap); + va_end(ap); +} +#endif /* NO_VARIADIC_MACROS */ + +void +sudo_debug_printf2_v1(const char *func, const char *file, int lineno, int level, + const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + sudo_debug_vprintf2(func, file, lineno, level, fmt, ap); + va_end(ap); +} + +#define EXEC_PREFIX "exec " + +void +sudo_debug_execve2_v1(int level, const char *path, char *const argv[], char *const envp[]) +{ + int buflen, pri, saved_errno = errno; + unsigned int subsys; + struct sudo_debug_instance *instance; + struct sudo_debug_output *output; + char * const *av; + char *cp, static_buf[4096], *buf = static_buf; + size_t plen; + debug_decl_func(sudo_debug_execve2); + + if (sudo_debug_active_instance == -1 || path == NULL) + goto out; + + /* Extract priority and subsystem from level. */ + pri = SUDO_DEBUG_PRI(level); + subsys = SUDO_DEBUG_SUBSYS(level); + + /* Find matching instance. */ + if (sudo_debug_active_instance > sudo_debug_last_instance) { + sudo_warnx_nodebug("%s: invalid instance ID %d, max %d", + __func__, sudo_debug_active_instance, sudo_debug_last_instance); + goto out; + } + instance = sudo_debug_instances[sudo_debug_active_instance]; + if (instance == NULL) { + sudo_warnx_nodebug("%s: unregistered instance index %d", __func__, + sudo_debug_active_instance); + goto out; + } + if (subsys > instance->max_subsystem) + goto out; + + SLIST_FOREACH(output, &instance->outputs, entries) { + bool log_envp = false; + + /* Make sure we want debug info at this level. */ + if (output->settings[subsys] < pri) + continue; + + /* Log envp for debug level "debug". */ + if (output->settings[subsys] >= SUDO_DEBUG_DEBUG - 1 && envp != NULL) + log_envp = true; + + /* Alloc and build up buffer. */ + plen = strlen(path); + buflen = sizeof(EXEC_PREFIX) -1 + plen; + if (argv != NULL && argv[0] != NULL) { + buflen += sizeof(" []") - 1; + for (av = argv; *av; av++) + buflen += strlen(*av) + 1; + buflen--; + } + if (log_envp && envp[0] != NULL) { + buflen += sizeof(" []") - 1; + for (av = envp; *av; av++) + buflen += strlen(*av) + 1; + buflen--; + } + if (buflen >= ssizeof(static_buf)) { + buf = malloc(buflen + 1); + if (buf == NULL) + goto out; + } + + /* Copy prefix and command. */ + memcpy(buf, EXEC_PREFIX, sizeof(EXEC_PREFIX) - 1); + cp = buf + sizeof(EXEC_PREFIX) - 1; + memcpy(cp, path, plen); + cp += plen; + + /* Copy argv. */ + if (argv != NULL && argv[0] != NULL) { + *cp++ = ' '; + *cp++ = '['; + for (av = argv; *av; av++) { + size_t avlen = strlen(*av); + memcpy(cp, *av, avlen); + cp += avlen; + *cp++ = ' '; + } + cp[-1] = ']'; + } + + if (log_envp && envp[0] != NULL) { + *cp++ = ' '; + *cp++ = '['; + for (av = envp; *av; av++) { + size_t avlen = strlen(*av); + memcpy(cp, *av, avlen); + cp += avlen; + *cp++ = ' '; + } + cp[-1] = ']'; + } + + *cp = '\0'; + + sudo_debug_write(output->fd, buf, buflen, 0); + if (buf != static_buf) { + free(buf); + buf = static_buf; + } + } +out: + errno = saved_errno; +} + +/* + * Returns the active instance or SUDO_DEBUG_INSTANCE_INITIALIZER + * if no instance is active. + */ +int +sudo_debug_get_active_instance_v1(void) +{ + return sudo_debug_active_instance; +} + +/* + * Sets a new active instance, returning the old one. + * Note that the old instance may be SUDO_DEBUG_INSTANCE_INITIALIZER + * if this is the only instance. + */ +int +sudo_debug_set_active_instance_v1(int idx) +{ + const int old_idx = sudo_debug_active_instance; + + if (idx >= -1 && idx <= sudo_debug_last_instance) + sudo_debug_active_instance = idx; + return old_idx; +} + +/* + * Replace the ofd with nfd in all outputs if present. + * Also updates sudo_debug_fds. + */ +void +sudo_debug_update_fd_v1(int ofd, int nfd) +{ + int idx; + + if (ofd <= sudo_debug_max_fd && sudo_isset(sudo_debug_fds, ofd)) { + /* Update sudo_debug_fds. */ + sudo_clrbit(sudo_debug_fds, ofd); + sudo_setbit(sudo_debug_fds, nfd); + + /* Update the outputs. */ + for (idx = 0; idx <= sudo_debug_last_instance; idx++) { + struct sudo_debug_instance *instance; + struct sudo_debug_output *output; + + instance = sudo_debug_instances[idx]; + if (instance == NULL) + continue; + SLIST_FOREACH(output, &instance->outputs, entries) { + if (output->fd == ofd) + output->fd = nfd; + } + } + } +} + +/* + * Returns the highest debug output fd or -1 if no debug files open. + * Fills in fds with the value of sudo_debug_fds. + */ +int +sudo_debug_get_fds_v1(unsigned char **fds) +{ + *fds = sudo_debug_fds; + return sudo_debug_max_fd; +} +#else /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */ +int +sudo_debug_register_v2(const char *program, const char *const subsystems[], + unsigned int ids[], struct sudo_conf_debug_file_list *debug_files, + int minfd) +{ + return SUDO_DEBUG_INSTANCE_INITIALIZER; +} + +int +sudo_debug_register_v1(const char *program, const char *const subsystems[], + unsigned int ids[], struct sudo_conf_debug_file_list *debug_files) +{ + return SUDO_DEBUG_INSTANCE_INITIALIZER; +} + +int +sudo_debug_deregister_v1(int idx) +{ + return -1; +} + +int +sudo_debug_parse_flags_v1(struct sudo_conf_debug_file_list *debug_files, + const char *entry) +{ + return 0; +} + +int +sudo_debug_get_instance_v1(const char *program) +{ + return SUDO_DEBUG_INSTANCE_INITIALIZER; +} + +pid_t +sudo_debug_fork_v1(void) +{ + return fork(); +} + +void +sudo_debug_enter_v1(const char *func, const char *file, int line, + int subsys) +{ +} + +void +sudo_debug_exit_v1(const char *func, const char *file, int line, + int subsys) +{ +} + +void +sudo_debug_exit_int_v1(const char *func, const char *file, int line, + int subsys, int ret) +{ +} + +void +sudo_debug_exit_long_v1(const char *func, const char *file, int line, + int subsys, long ret) +{ +} + +void +sudo_debug_exit_id_t_v1(const char *func, const char *file, int line, + int subsys, id_t ret) +{ +} + +void +sudo_debug_exit_size_t_v1(const char *func, const char *file, int line, + int subsys, size_t ret) +{ +} + +void +sudo_debug_exit_ssize_t_v1(const char *func, const char *file, int line, + int subsys, ssize_t ret) +{ +} + +void +sudo_debug_exit_time_t_v1(const char *func, const char *file, int line, + int subsys, time_t ret) +{ +} + +void +sudo_debug_exit_bool_v1(const char *func, const char *file, int line, + int subsys, bool ret) +{ +} + +void +sudo_debug_exit_str_v1(const char *func, const char *file, int line, + int subsys, const char *ret) +{ +} + +void +sudo_debug_exit_str_masked_v1(const char *func, const char *file, int line, + int subsys, const char *ret) +{ +} + +void +sudo_debug_exit_ptr_v1(const char *func, const char *file, int line, + int subsys, const void *ret) +{ +} + +void +sudo_debug_write2_v1(int fd, const char *func, const char *file, int lineno, + const char *str, int len, int errnum) +{ +} + +bool +sudo_debug_needed_v1(int level) +{ + return false; +} + +void +sudo_debug_vprintf2_v1(const char *func, const char *file, int lineno, int level, + const char *fmt, va_list ap) +{ +} + +#ifdef NO_VARIADIC_MACROS +void +sudo_debug_printf_nvm_v1(int pri, const char *fmt, ...) +{ +} +#endif /* NO_VARIADIC_MACROS */ + +void +sudo_debug_printf2_v1(const char *func, const char *file, int lineno, int level, + const char *fmt, ...) +{ +} + +void +sudo_debug_execve2_v1(int level, const char *path, char *const argv[], char *const envp[]) +{ +} + +int +sudo_debug_get_active_instance_v1(void) +{ + return SUDO_DEBUG_INSTANCE_INITIALIZER; +} + +int +sudo_debug_set_active_instance_v1(int idx) +{ + return SUDO_DEBUG_INSTANCE_INITIALIZER; +} + +void +sudo_debug_update_fd_v1(int ofd, int nfd) +{ +} + +int +sudo_debug_get_fds_v1(unsigned char **fds) +{ + return -1; +} +#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */ |