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-rw-r--r--plugins/sudoers/filedigest.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/plugins/sudoers/filedigest.c b/plugins/sudoers/filedigest.c
new file mode 100644
index 0000000..764e35e
--- /dev/null
+++ b/plugins/sudoers/filedigest.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2013-2018 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 */
+#if defined(HAVE_STDINT_H)
+# include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+# include <inttypes.h>
+#endif
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "sudoers.h"
+#include "sudo_digest.h"
+
+unsigned char *
+sudo_filedigest(int fd, const char *file, int digest_type, size_t *digest_len)
+{
+ unsigned char *file_digest = NULL;
+ unsigned char buf[32 * 1024];
+ struct sudo_digest *dig = NULL;
+ FILE *fp = NULL;
+ size_t nread;
+ int fd2;
+ debug_decl(sudo_filedigest, SUDOERS_DEBUG_UTIL)
+
+ *digest_len = sudo_digest_getlen(digest_type);
+ if (*digest_len == (size_t)-1) {
+ sudo_warnx(U_("unsupported digest type %d for %s"), digest_type, file);
+ goto bad;
+ }
+
+ if ((dig = sudo_digest_alloc(digest_type)) == NULL) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ goto bad;
+ }
+
+ if ((fd2 = dup(fd)) == -1) {
+ sudo_debug_printf(SUDO_DEBUG_INFO, "unable to dup %s: %s",
+ file, strerror(errno));
+ goto bad;
+ }
+ if ((fp = fdopen(fd2, "r")) == NULL) {
+ sudo_debug_printf(SUDO_DEBUG_INFO, "unable to fdopen %s: %s",
+ file, strerror(errno));
+ close(fd2);
+ goto bad;
+ }
+ if ((file_digest = malloc(*digest_len)) == NULL) {
+ sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+ goto bad;
+ }
+
+ while ((nread = fread(buf, 1, sizeof(buf), fp)) != 0) {
+ sudo_digest_update(dig, buf, nread);
+ }
+ if (ferror(fp)) {
+ sudo_warnx(U_("%s: read error"), file);
+ goto bad;
+ }
+ sudo_digest_final(dig, file_digest);
+ sudo_digest_free(dig);
+ fclose(fp);
+
+ debug_return_ptr(file_digest);
+bad:
+ sudo_digest_free(dig);
+ free(file_digest);
+ if (fp != NULL)
+ fclose(fp);
+ debug_return_ptr(NULL);
+}