harden cmdline options

make all options single-set, only accept options after command and only
those needed for the specific command.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This work was sponsored by WIO (wiowireless.com)

diff --git a/ucert.c b/ucert.c
index 12b42a875830f0e6857b2e8c5d953befd413562f..7e419d4d8b04700df3b6f06803706f5be3ba6185 100644 (file)
--- a/ucert.c
+++ b/ucert.c
@@ -624,39 +624,63 @@ int main(int argc, char *argv[]) {
        while ((ch = getopt(argc, argv, "ADIRVc:m:p:P:qs:x:")) != -1) {
                switch (ch) {
                case 'A':
+                       if (cmd != CMD_NONE)
+                               return usage(argv[0]);
                        cmd = CMD_APPEND;
                        break;
                case 'D':
+                       if (cmd != CMD_NONE)
+                               return usage(argv[0]);
                        cmd = CMD_DUMP;
                        break;
                case 'I':
+                       if (cmd != CMD_NONE)
+                               return usage(argv[0]);
                        cmd = CMD_ISSUE;
                        break;
                case 'R':
+                       if (cmd != CMD_NONE)
+                               return usage(argv[0]);
                        cmd = CMD_REVOKE;
                        break;
                case 'V':
+                       if (cmd != CMD_NONE)
+                               return usage(argv[0]);
                        cmd = CMD_VERIFY;
                        break;
                case 'c':
+                       if (certfile || cmd == CMD_NONE)
+                               return usage(argv[0]);
                        certfile = optarg;
                        break;
                case 'm':
+                       if (msgfile || cmd != CMD_VERIFY)
+                               return usage(argv[0]);
                        msgfile = optarg;
                        break;
                case 'p':
+                       if (pubkeyfile || (cmd != CMD_VERIFY && cmd != CMD_ISSUE) || cmd == CMD_NONE)
+                               return usage(argv[0]);
                        pubkeyfile = optarg;
                        break;
                case 'P':
+                       if (pubkeydir || (cmd != CMD_VERIFY && cmd != CMD_REVOKE) || cmd == CMD_NONE)
+                               return usage(argv[0]);
                        pubkeydir = optarg;
                        break;
                case 'q':
+                       if (quiet || cmd == CMD_NONE)
+                               return usage(argv[0]);
                        quiet = true;
                        break;
                case 's':
+                       if (seckeyfile || cmd != CMD_ISSUE || cmd == CMD_NONE)
+                               return usage(argv[0]);
                        seckeyfile = optarg;
                        break;
                case 'x':
+                       if (sigfile || cmd != CMD_APPEND || cmd == CMD_NONE)
+                               return usage(argv[0]);
                        sigfile = optarg;
                        break;
                default: