1 files changed, 91 insertions, 0 deletions
diff --git a/plugins/sudoers/filedigest.c b/plugins/sudoers/filedigest.c
new file mode 100644
index 0000000..36cc498
--- /dev/null
+++ b/plugins/sudoers/filedigest.c
@@ -0,0 +1,91 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#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, unsigned 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 == 0) {
+	sudo_warnx(U_("unsupported digest type %u for %s"), digest_type, file);
+	debug_return_ptr(NULL);
+    }
+
+    if ((fd2 = dup(fd)) == -1) {
+	sudo_debug_printf(SUDO_DEBUG_INFO, "unable to dup %s: %s",
+	    file, strerror(errno));
+	debug_return_ptr(NULL);
+    }
+    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;
+    }
+    if ((dig = sudo_digest_alloc(digest_type)) == 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);
+}