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Annotation of src/usr.bin/skeyaudit/skeyaudit.c, Revision 1.1

1.1     ! millert     1: #include <err.h>
        !             2: #include <errno.h>
        !             3: #include <limits.h>
        !             4: #include <paths.h>
        !             5: #include <pwd.h>
        !             6: #include <stdio.h>
        !             7: #include <stdlib.h>
        !             8: #include <string.h>
        !             9: #include <unistd.h>
        !            10: #include <skey.h>
        !            11:
        !            12: #include <sys/types.h>
        !            13: #include <sys/param.h>
        !            14:
        !            15: extern char *__progname;
        !            16:
        !            17: void usage __P((void));
        !            18:
        !            19: int
        !            20: main(argc, argv)
        !            21:        int argc;
        !            22:        char **argv;
        !            23: {
        !            24:        struct passwd *pw;
        !            25:        struct skey key;
        !            26:        int ch, errs, left = 0, iflag = 0, limit = 12;
        !            27:        char *name, hostname[MAXHOSTNAMELEN];
        !            28:        FILE *out;
        !            29:
        !            30:        while ((ch = getopt(argc, argv, "il:")) != -1)
        !            31:                switch(ch) {
        !            32:                case 'i':
        !            33:                        iflag = 1;
        !            34:                        break;
        !            35:                case 'l':
        !            36:                        errno = 0;
        !            37:                        if ((limit = (int)strtol(optarg, NULL, 10)) == 0)
        !            38:                                errno = ERANGE;
        !            39:                        if (errno) {
        !            40:                                warn("key limit");
        !            41:                                usage();
        !            42:                        }
        !            43:                        break;
        !            44:                default:
        !            45:                        usage();
        !            46:        }
        !            47:
        !            48:        if (argc - optind > 0)
        !            49:                usage();
        !            50:
        !            51:        if ((pw = getpwuid(getuid())) == NULL)
        !            52:                errx(1, "no passwd entry for uid %u", getuid());
        !            53:        if ((name = strdup(pw->pw_name)) == NULL)
        !            54:                err(1, "cannot allocate memory");
        !            55:        sevenbit(name);
        !            56:
        !            57:        errs = skeylookup(&key, name);
        !            58:        switch (errs) {
        !            59:                case 0:         /* Success! */
        !            60:                        left = key.n - 1;
        !            61:                        break;
        !            62:                case -1:        /* File error */
        !            63:                        /* XXX - _PATH_SKEYFILE should be in paths.h? */
        !            64:                        warnx("cannot open /etc/skeykeys");
        !            65:                        break;
        !            66:                case 1:         /* Unknown user */
        !            67:                        warnx("%s is not listed in /etc/skeykeys", name);
        !            68:        }
        !            69:
        !            70:        setuid(getuid());       /* Run sendmail as user not root */
        !            71:
        !            72:        if (errs || left >= limit)
        !            73:                exit(errs);
        !            74:
        !            75:        if (gethostname(hostname, sizeof(hostname)) == -1)
        !            76:                strcpy(hostname, "unknown");
        !            77:
        !            78:        if (iflag) {
        !            79:                out = stdout;
        !            80:        } else {
        !            81:                char cmd[sizeof(_PATH_SENDMAIL) + 3];
        !            82:
        !            83:                sprintf(cmd, "%s -t", _PATH_SENDMAIL);
        !            84:                out = popen(cmd, "w");
        !            85:        }
        !            86:
        !            87:        if (!iflag)
        !            88:                (void)fprintf(out,
        !            89:                    "To: %s\nSubject: IMPORTANT action required\n", name);
        !            90:
        !            91:        (void)fprintf(out,
        !            92: "\nYou are nearing the end of your current S/Key sequence for account\n\
        !            93: %s on system %s.\n\n\
        !            94: Your S/key sequence number is now %d.  When it reaches zero\n\
        !            95: you will no longer be able to use S/Key to login into the system.\n\n\
        !            96: Type \"skeyinit -s\" to reinitialize your sequence number.\n\n",
        !            97: name, hostname, left - 1);
        !            98:
        !            99:        if (iflag)
        !           100:                (void)fclose(out);
        !           101:        else
        !           102:                (void)pclose(out);
        !           103:
        !           104:        exit(0);
        !           105: }
        !           106:
        !           107: void
        !           108: usage()
        !           109: {
        !           110:        (void)fprintf(stderr, "Usage: %s [-i] [-l limit]\n",
        !           111:            __progname);
        !           112:        exit(1);
        !           113: }