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-rw-r--r--plugins/sudoers/iolog_path.c287
1 files changed, 287 insertions, 0 deletions
diff --git a/plugins/sudoers/iolog_path.c b/plugins/sudoers/iolog_path.c
new file mode 100644
index 0000000..7cdc6ed
--- /dev/null
+++ b/plugins/sudoers/iolog_path.c
@@ -0,0 +1,287 @@
+/*
+ * Copyright (c) 2011-2015 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/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <pwd.h>
+#include <grp.h>
+#include <time.h>
+
+#include "sudoers.h"
+
+struct path_escape {
+ const char *name;
+ size_t (*copy_fn)(char *, size_t, char *);
+};
+
+static size_t
+fill_seq(char *str, size_t strsize, char *logdir)
+{
+#ifdef SUDOERS_NO_SEQ
+ debug_decl(fill_seq, SUDOERS_DEBUG_UTIL)
+ debug_return_size_t(strlcpy(str, "%{seq}", strsize));
+#else
+ static char sessid[7];
+ int len;
+ debug_decl(fill_seq, SUDOERS_DEBUG_UTIL)
+
+ if (sessid[0] == '\0') {
+ if (!io_nextid(logdir, def_iolog_dir, sessid))
+ debug_return_size_t((size_t)-1);
+ }
+
+ /* Path is of the form /var/log/sudo-io/00/00/01. */
+ len = snprintf(str, strsize, "%c%c/%c%c/%c%c", sessid[0],
+ sessid[1], sessid[2], sessid[3], sessid[4], sessid[5]);
+ if (len < 0)
+ debug_return_size_t(strsize); /* handle non-standard snprintf() */
+ debug_return_size_t(len);
+#endif /* SUDOERS_NO_SEQ */
+}
+
+static size_t
+fill_user(char *str, size_t strsize, char *unused)
+{
+ debug_decl(fill_user, SUDOERS_DEBUG_UTIL)
+ debug_return_size_t(strlcpy(str, user_name, strsize));
+}
+
+static size_t
+fill_group(char *str, size_t strsize, char *unused)
+{
+ struct group *grp;
+ size_t len;
+ debug_decl(fill_group, SUDOERS_DEBUG_UTIL)
+
+ if ((grp = sudo_getgrgid(user_gid)) != NULL) {
+ len = strlcpy(str, grp->gr_name, strsize);
+ sudo_gr_delref(grp);
+ } else {
+ len = strlen(str);
+ len = snprintf(str + len, strsize - len, "#%u",
+ (unsigned int) user_gid);
+ }
+ debug_return_size_t(len);
+}
+
+static size_t
+fill_runas_user(char *str, size_t strsize, char *unused)
+{
+ debug_decl(fill_runas_user, SUDOERS_DEBUG_UTIL)
+ debug_return_size_t(strlcpy(str, runas_pw->pw_name, strsize));
+}
+
+static size_t
+fill_runas_group(char *str, size_t strsize, char *unused)
+{
+ struct group *grp;
+ size_t len;
+ debug_decl(fill_runas_group, SUDOERS_DEBUG_UTIL)
+
+ if (runas_gr != NULL) {
+ len = strlcpy(str, runas_gr->gr_name, strsize);
+ } else {
+ if ((grp = sudo_getgrgid(runas_pw->pw_gid)) != NULL) {
+ len = strlcpy(str, grp->gr_name, strsize);
+ sudo_gr_delref(grp);
+ } else {
+ len = strlen(str);
+ len = snprintf(str + len, strsize - len, "#%u",
+ (unsigned int) runas_pw->pw_gid);
+ }
+ }
+ debug_return_size_t(len);
+}
+
+static size_t
+fill_hostname(char *str, size_t strsize, char *unused)
+{
+ debug_decl(fill_hostname, SUDOERS_DEBUG_UTIL)
+ debug_return_size_t(strlcpy(str, user_shost, strsize));
+}
+
+static size_t
+fill_command(char *str, size_t strsize, char *unused)
+{
+ debug_decl(fill_command, SUDOERS_DEBUG_UTIL)
+ debug_return_size_t(strlcpy(str, user_base, strsize));
+}
+
+/* Note: "seq" must be first in the list. */
+static struct path_escape io_path_escapes[] = {
+ { "seq", fill_seq },
+ { "user", fill_user },
+ { "group", fill_group },
+ { "runas_user", fill_runas_user },
+ { "runas_group", fill_runas_group },
+ { "hostname", fill_hostname },
+ { "command", fill_command },
+ { NULL, NULL }
+};
+
+/*
+ * Concatenate dir + file, expanding any escape sequences.
+ * Returns the concatenated path and sets slashp point to
+ * the path separator between the expanded dir and file.
+ */
+char *
+expand_iolog_path(const char *prefix, const char *dir, const char *file,
+ char **slashp)
+{
+ size_t len, prelen = 0;
+ char *dst, *dst0, *path, *pathend, tmpbuf[PATH_MAX];
+ char *slash = NULL;
+ const char *endbrace, *src = dir;
+ struct path_escape *escapes = NULL;
+ int pass, oldlocale;
+ bool strfit;
+ debug_decl(expand_iolog_path, SUDOERS_DEBUG_UTIL)
+
+ /* Expanded path must be <= PATH_MAX */
+ if (prefix != NULL)
+ prelen = strlen(prefix);
+ path = malloc(prelen + PATH_MAX);
+ if (path == NULL) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ goto bad;
+ }
+ *path = '\0';
+ pathend = path + prelen + PATH_MAX;
+ dst = path;
+
+ /* Copy prefix, if present. */
+ if (prefix != NULL) {
+ memcpy(path, prefix, prelen);
+ dst += prelen;
+ *dst = '\0';
+ }
+
+ /* Trim leading slashes from file component. */
+ while (*file == '/')
+ file++;
+
+ for (pass = 0; pass < 3; pass++) {
+ strfit = false;
+ switch (pass) {
+ case 0:
+ src = dir;
+ escapes = io_path_escapes + 1; /* skip "%{seq}" */
+ break;
+ case 1:
+ /* Trim trailing slashes from dir component. */
+ while (dst > path + prelen + 1 && dst[-1] == '/')
+ dst--;
+ /* The NUL will be replaced with a '/' at the end. */
+ if (dst + 1 >= pathend)
+ goto bad;
+ slash = dst++;
+ continue;
+ case 2:
+ src = file;
+ escapes = io_path_escapes;
+ break;
+ }
+ dst0 = dst;
+ for (; *src != '\0'; src++) {
+ if (src[0] == '%') {
+ if (src[1] == '{') {
+ endbrace = strchr(src + 2, '}');
+ if (endbrace != NULL) {
+ struct path_escape *esc;
+ len = (size_t)(endbrace - src - 2);
+ for (esc = escapes; esc->name != NULL; esc++) {
+ if (strncmp(src + 2, esc->name, len) == 0 &&
+ esc->name[len] == '\0')
+ break;
+ }
+ if (esc->name != NULL) {
+ len = esc->copy_fn(dst, (size_t)(pathend - dst),
+ path + prelen);
+ if (len >= (size_t)(pathend - dst))
+ goto bad;
+ dst += len;
+ src = endbrace;
+ continue;
+ }
+ }
+ } else if (src[1] == '%') {
+ /* Collapse %% -> % */
+ src++;
+ } else {
+ /* May need strftime() */
+ strfit = 1;
+ }
+ }
+ /* Need at least 2 chars, including the NUL terminator. */
+ if (dst + 1 >= pathend)
+ goto bad;
+ *dst++ = *src;
+ }
+ *dst = '\0';
+
+ /* Expand strftime escapes as needed. */
+ if (strfit) {
+ time_t now;
+ struct tm *timeptr;
+
+ time(&now);
+ if ((timeptr = localtime(&now)) == NULL)
+ goto bad;
+
+ /* Use sudoers locale for strftime() */
+ sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
+
+ /* We only call strftime() on the current part of the buffer. */
+ tmpbuf[sizeof(tmpbuf) - 1] = '\0';
+ len = strftime(tmpbuf, sizeof(tmpbuf), dst0, timeptr);
+
+ /* Restore old locale. */
+ sudoers_setlocale(oldlocale, NULL);
+
+ if (len == 0 || tmpbuf[sizeof(tmpbuf) - 1] != '\0')
+ goto bad; /* strftime() failed, buf too small? */
+
+ if (len >= (size_t)(pathend - dst0))
+ goto bad; /* expanded buffer too big to fit. */
+ memcpy(dst0, tmpbuf, len);
+ dst = dst0 + len;
+ *dst = '\0';
+ }
+ }
+ if (slash != NULL)
+ *slash = '/';
+ if (slashp != NULL)
+ *slashp = slash;
+
+ debug_return_str(path);
+bad:
+ free(path);
+ debug_return_str(NULL);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-31 08:52:47 +0000