Demo of use of errors in applications.
[openssl.git] / apps / passwd.c
index c189d23..9ca25dd 100644 (file)
@@ -1,6 +1,10 @@
 /* apps/passwd.c */
 
-#if !defined(NO_DES) /* && !defined(prerequisites of other algorithms) */
+#if defined OPENSSL_NO_MD5 || defined CHARSET_EBCDIC
+# define NO_MD5CRYPT_1
+#endif
+
+#if !defined(OPENSSL_NO_DES) || !defined(NO_MD5CRYPT_1)
 
 #include <assert.h>
 #include <string.h>
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/rand.h>
-
-#ifndef NO_DES
+#ifndef OPENSSL_NO_DES
 # include <openssl/des.h>
 #endif
+#ifndef NO_MD5CRYPT_1
+# include <openssl/md5.h>
+#endif
+
 
 #undef PROG
 #define PROG passwd_main
@@ -32,21 +39,38 @@ static unsigned const char cov_2char[64]={
        0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A
 };
 
-/* -crypt        - standard Unix password algorithm (default, only choice)
+static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
+       char *passwd, BIO *out, int quiet, int table, int reverse,
+       size_t pw_maxlen, int usecrypt, int use1, int useapr1);
+
+/* -crypt        - standard Unix password algorithm (default)
+ * -1            - MD5-based password algorithm
+ * -apr1         - MD5-based password algorithm, Apache variant
  * -salt string  - salt
+ * -in file      - read passwords from file
+ * -stdin        - read passwords from stdin
+ * -noverify     - never verify when reading password from terminal
  * -quiet        - no warnings
  * -table        - format output as table
+ * -reverse      - switch table columns
  */
 
+int MAIN(int, char **);
+
 int MAIN(int argc, char **argv)
        {
        int ret = 1;
-       char *salt = NULL, *passwd, **passwds = NULL;
+       char *infile = NULL;
+       int in_stdin = 0;
+       int in_noverify = 0;
+       char *salt = NULL, *passwd = NULL, **passwds = NULL;
        char *salt_malloc = NULL, *passwd_malloc = NULL;
-       BIO *out = NULL;
+       size_t passwd_malloc_size = 0;
+       int pw_source_defined = 0;
+       BIO *in = NULL, *out = NULL;
        int i, badopt, opt_done;
-       int passed_salt = 0, quiet = 0, table = 0;
-       int usecrypt = 0;
+       int passed_salt = 0, quiet = 0, table = 0, reverse = 0;
+       int usecrypt = 0, use1 = 0, useapr1 = 0;
        size_t pw_maxlen = 0;
 
        apps_startup();
@@ -54,10 +78,19 @@ int MAIN(int argc, char **argv)
        if (bio_err == NULL)
                if ((bio_err=BIO_new(BIO_s_file())) != NULL)
                        BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);
+
+       if (!load_config(bio_err, NULL))
+               goto err;
        out = BIO_new(BIO_s_file());
        if (out == NULL)
                goto err;
        BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
+#ifdef OPENSSL_SYS_VMS
+       {
+       BIO *tmpbio = BIO_new(BIO_f_linebuffer());
+       out = BIO_push(tmpbio, out);
+       }
+#endif
 
        badopt = 0, opt_done = 0;
        i = 0;
@@ -65,6 +98,10 @@ int MAIN(int argc, char **argv)
                {
                if (strcmp(argv[i], "-crypt") == 0)
                        usecrypt = 1;
+               else if (strcmp(argv[i], "-1") == 0)
+                       use1 = 1;
+               else if (strcmp(argv[i], "-apr1") == 0)
+                       useapr1 = 1;
                else if (strcmp(argv[i], "-salt") == 0)
                        {
                        if ((argv[i+1] != NULL) && (salt == NULL))
@@ -72,121 +109,404 @@ int MAIN(int argc, char **argv)
                                passed_salt = 1;
                                salt = argv[++i];
                                }
-                       else badopt = 1;
+                       else
+                               badopt = 1;
+                       }
+               else if (strcmp(argv[i], "-in") == 0)
+                       {
+                       if ((argv[i+1] != NULL) && !pw_source_defined)
+                               {
+                               pw_source_defined = 1;
+                               infile = argv[++i];
+                               }
+                       else
+                               badopt = 1;
+                       }
+               else if (strcmp(argv[i], "-stdin") == 0)
+                       {
+                       if (!pw_source_defined)
+                               {
+                               pw_source_defined = 1;
+                               in_stdin = 1;
+                               }
+                       else
+                               badopt = 1;
                        }
+               else if (strcmp(argv[i], "-noverify") == 0)
+                       in_noverify = 1;
                else if (strcmp(argv[i], "-quiet") == 0)
                        quiet = 1;
                else if (strcmp(argv[i], "-table") == 0)
                        table = 1;
+               else if (strcmp(argv[i], "-reverse") == 0)
+                       reverse = 1;
                else if (argv[i][0] == '-')
                        badopt = 1;
-               else
-                       /* non-option argument */
+               else if (!pw_source_defined)
+                       /* non-option arguments, use as passwords */
                        {
+                       pw_source_defined = 1;
                        passwds = &argv[i];
                        opt_done = 1;
                        }
+               else
+                       badopt = 1;
                }
 
-       if (usecrypt /* + algo2 + algo3 + ... */ == 0) /* use default */
+       if (!usecrypt && !use1 && !useapr1) /* use default */
                usecrypt = 1;
-       if (usecrypt /* + algo2 + algo3 */ > 1) /* conflict */
+       if (usecrypt + use1 + useapr1 > 1) /* conflict */
                badopt = 1;
 
+       /* reject unsupported algorithms */
+#ifdef OPENSSL_NO_DES
+       if (usecrypt) badopt = 1;
+#endif
+#ifdef NO_MD5CRYPT_1
+       if (use1 || useapr1) badopt = 1;
+#endif
+
        if (badopt) 
                {
                BIO_printf(bio_err, "Usage: passwd [options] [passwords]\n");
                BIO_printf(bio_err, "where options are\n");
+#ifndef OPENSSL_NO_DES
                BIO_printf(bio_err, "-crypt             standard Unix password algorithm (default)\n");
+#endif
+#ifndef NO_MD5CRYPT_1
+               BIO_printf(bio_err, "-1                 MD5-based password algorithm\n");
+               BIO_printf(bio_err, "-apr1              MD5-based password algorithm, Apache variant\n");
+#endif
                BIO_printf(bio_err, "-salt string       use provided salt\n");
+               BIO_printf(bio_err, "-in file           read passwords from file\n");
+               BIO_printf(bio_err, "-stdin             read passwords from stdin\n");
+               BIO_printf(bio_err, "-noverify          never verify when reading password from terminal\n");
                BIO_printf(bio_err, "-quiet             no warnings\n");
                BIO_printf(bio_err, "-table             format output as table\n");
+               BIO_printf(bio_err, "-reverse           switch table columns\n");
                
                goto err;
                }
 
+       if ((infile != NULL) || in_stdin)
+               {
+               in = BIO_new(BIO_s_file());
+               if (in == NULL)
+                       goto err;
+               if (infile != NULL)
+                       {
+                       assert(in_stdin == 0);
+                       if (BIO_read_filename(in, infile) <= 0)
+                               goto err;
+                       }
+               else
+                       {
+                       assert(in_stdin);
+                       BIO_set_fp(in, stdin, BIO_NOCLOSE);
+                       }
+               }
+       
        if (usecrypt)
                pw_maxlen = 8;
-       /* else if ... */
+       else if (use1 || useapr1)
+               pw_maxlen = 256; /* arbitrary limit, should be enough for most passwords */
 
        if (passwds == NULL)
+               {
+               /* no passwords on the command line */
+
+               passwd_malloc_size = pw_maxlen + 2;
+               /* longer than necessary so that we can warn about truncation */
+               passwd = passwd_malloc = OPENSSL_malloc(passwd_malloc_size);
+               if (passwd_malloc == NULL)
+                       goto err;
+               }
+
+       if ((in == NULL) && (passwds == NULL))
                {
                /* build a null-terminated list */
                static char *passwds_static[2] = {NULL, NULL};
-                  
+               
                passwds = passwds_static;
-               passwd_malloc = Malloc(pw_maxlen + 1);
-               if (passwd_malloc == NULL)
-                       goto err;
-               if (EVP_read_pw_string(passwd_malloc, pw_maxlen + 1, "Password: ", 0) != 0)
-                       goto err;
+               if (in == NULL)
+                       if (EVP_read_pw_string(passwd_malloc, passwd_malloc_size, "Password: ", !(passed_salt || in_noverify)) != 0)
+                               goto err;
                passwds[0] = passwd_malloc;
                }
 
-       assert(passwds != NULL);
-       assert(*passwds != NULL);
-       
-       do /* loop over list of passwords */
+       if (in == NULL)
                {
-               /* first make sure we have a salt */
-               if (!passed_salt)
+               assert(passwds != NULL);
+               assert(*passwds != NULL);
+               
+               do /* loop over list of passwords */
                        {
-                       if (usecrypt)
+                       passwd = *passwds++;
+                       if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
+                               quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
+                               goto err;
+                       }
+               while (*passwds != NULL);
+               }
+       else
+               /* in != NULL */
+               {
+               int done;
+
+               assert (passwd != NULL);
+               do
+                       {
+                       int r = BIO_gets(in, passwd, pw_maxlen + 1);
+                       if (r > 0)
                                {
-                               if (salt_malloc == NULL)
+                               char *c = (strchr(passwd, '\n')) ;
+                               if (c != NULL)
+                                       *c = 0; /* truncate at newline */
+                               else
                                        {
-                                       salt = salt_malloc = Malloc(3);
-                                       if (salt_malloc == NULL)
-                                               goto err;
+                                       /* ignore rest of line */
+                                       char trash[BUFSIZ];
+                                       do
+                                               r = BIO_gets(in, trash, sizeof trash);
+                                       while ((r > 0) && (!strchr(trash, '\n')));
                                        }
-                               if (RAND_pseudo_bytes((unsigned char *)salt, 2) < 0)
+                               
+                               if (!do_passwd(passed_salt, &salt, &salt_malloc, passwd, out,
+                                       quiet, table, reverse, pw_maxlen, usecrypt, use1, useapr1))
                                        goto err;
-                               salt[0] = cov_2char[salt[0] & 0x3f]; /* 6 bits */
-                               salt[1] = cov_2char[salt[1] & 0x3f]; /* 6 bits */
-                               salt[2] = 0;
-#ifdef CHARSET_EBCDIC
-                               ascii2ebcdic(salt, salt, 2); /* des_crypt will convert
-                                                             * back to ASCII */
-#endif
                                }
-                       /* else if (algo2) ... */
+                       done = (r <= 0);
                        }
+               while (!done);
+               }
+       ret = 0;
+
+err:
+       ERR_print_errors(bio_err);
+       if (salt_malloc)
+               OPENSSL_free(salt_malloc);
+       if (passwd_malloc)
+               OPENSSL_free(passwd_malloc);
+       if (in)
+               BIO_free(in);
+       if (out)
+               BIO_free_all(out);
+       apps_shutdown();
+       OPENSSL_EXIT(ret);
+       }
+
+
+#ifndef NO_MD5CRYPT_1
+/* MD5-based password algorithm (should probably be available as a library
+ * function; then the static buffer would not be acceptable).
+ * For magic string "1", this should be compatible to the MD5-based BSD
+ * password algorithm.
+ * For 'magic' string "apr1", this is compatible to the MD5-based Apache
+ * password algorithm.
+ * (Apparently, the Apache password algorithm is identical except that the
+ * 'magic' string was changed -- the laziest application of the NIH principle
+ * I've ever encountered.)
+ */
+static char *md5crypt(const char *passwd, const char *magic, const char *salt)
+       {
+       static char out_buf[6 + 9 + 24 + 2]; /* "$apr1$..salt..$.......md5hash..........\0" */
+       unsigned char buf[MD5_DIGEST_LENGTH];
+       char *salt_out;
+       int n;
+       unsigned int i;
+       EVP_MD_CTX md,md2;
+       size_t passwd_len, salt_len;
+
+       passwd_len = strlen(passwd);
+       out_buf[0] = '$';
+       out_buf[1] = 0;
+       assert(strlen(magic) <= 4); /* "1" or "apr1" */
+       strncat(out_buf, magic, 4);
+       strncat(out_buf, "$", 1);
+       strncat(out_buf, salt, 8);
+       assert(strlen(out_buf) <= 6 + 8); /* "$apr1$..salt.." */
+       salt_out = out_buf + 2 + strlen(magic);
+       salt_len = strlen(salt_out);
+       assert(salt_len <= 8);
+       
+       EVP_MD_CTX_init(&md);
+       EVP_DigestInit_ex(&md,EVP_md5(), NULL);
+       EVP_DigestUpdate(&md, passwd, passwd_len);
+       EVP_DigestUpdate(&md, "$", 1);
+       EVP_DigestUpdate(&md, magic, strlen(magic));
+       EVP_DigestUpdate(&md, "$", 1);
+       EVP_DigestUpdate(&md, salt_out, salt_len);
+       
+       EVP_MD_CTX_init(&md2);
+       EVP_DigestInit_ex(&md2,EVP_md5(), NULL);
+       EVP_DigestUpdate(&md2, passwd, passwd_len);
+       EVP_DigestUpdate(&md2, salt_out, salt_len);
+       EVP_DigestUpdate(&md2, passwd, passwd_len);
+       EVP_DigestFinal_ex(&md2, buf, NULL);
+
+       for (i = passwd_len; i > sizeof buf; i -= sizeof buf)
+               EVP_DigestUpdate(&md, buf, sizeof buf);
+       EVP_DigestUpdate(&md, buf, i);
+       
+       n = passwd_len;
+       while (n)
+               {
+               EVP_DigestUpdate(&md, (n & 1) ? "\0" : passwd, 1);
+               n >>= 1;
+               }
+       EVP_DigestFinal_ex(&md, buf, NULL);
+
+       for (i = 0; i < 1000; i++)
+               {
+               EVP_DigestInit_ex(&md2,EVP_md5(), NULL);
+               EVP_DigestUpdate(&md2, (i & 1) ? (unsigned const char *) passwd : buf,
+                                      (i & 1) ? passwd_len : sizeof buf);
+               if (i % 3)
+                       EVP_DigestUpdate(&md2, salt_out, salt_len);
+               if (i % 7)
+                       EVP_DigestUpdate(&md2, passwd, passwd_len);
+               EVP_DigestUpdate(&md2, (i & 1) ? buf : (unsigned const char *) passwd,
+                                      (i & 1) ? sizeof buf : passwd_len);
+               EVP_DigestFinal_ex(&md2, buf, NULL);
+               }
+       EVP_MD_CTX_cleanup(&md2);
+       
+        {
+               /* transform buf into output string */
+       
+               unsigned char buf_perm[sizeof buf];
+               int dest, source;
+               char *output;
+
+               /* silly output permutation */
+               for (dest = 0, source = 0; dest < 14; dest++, source = (source + 6) % 17)
+                       buf_perm[dest] = buf[source];
+               buf_perm[14] = buf[5];
+               buf_perm[15] = buf[11];
+#ifndef PEDANTIC /* Unfortunately, this generates a "no effect" warning */
+               assert(16 == sizeof buf_perm);
+#endif
                
-               assert(salt != NULL);
+               output = salt_out + salt_len;
+               assert(output == out_buf + strlen(out_buf));
+               
+               *output++ = '$';
 
-               /* truncate password if necessary */
-               passwd = *passwds++;
-               if ((strlen(passwd) > pw_maxlen))
+               for (i = 0; i < 15; i += 3)
                        {
-                       if (!quiet)
-                               BIO_printf(bio_err, "Warning: truncating password to %u characters\n", pw_maxlen);
-                       passwd[pw_maxlen] = 0;
+                       *output++ = cov_2char[buf_perm[i+2] & 0x3f];
+                       *output++ = cov_2char[((buf_perm[i+1] & 0xf) << 2) |
+                                                 (buf_perm[i+2] >> 6)];
+                       *output++ = cov_2char[((buf_perm[i] & 3) << 4) |
+                                                 (buf_perm[i+1] >> 4)];
+                       *output++ = cov_2char[buf_perm[i] >> 2];
                        }
-               assert(strlen(passwd) <= pw_maxlen);
-               
-               /* now compute password hash */
+               assert(i == 15);
+               *output++ = cov_2char[buf_perm[i] & 0x3f];
+               *output++ = cov_2char[buf_perm[i] >> 6];
+               *output = 0;
+               assert(strlen(out_buf) < sizeof(out_buf));
+        }
+       EVP_MD_CTX_cleanup(&md);
+
+       return out_buf;
+       }
+#endif
+
+
+static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
+       char *passwd, BIO *out, int quiet, int table, int reverse,
+       size_t pw_maxlen, int usecrypt, int use1, int useapr1)
+       {
+       char *hash = NULL;
+
+       assert(salt_p != NULL);
+       assert(salt_malloc_p != NULL);
+
+       /* first make sure we have a salt */
+       if (!passed_salt)
+               {
+#ifndef OPENSSL_NO_DES
                if (usecrypt)
                        {
-                       char *hash = des_crypt(passwd, salt);
-                       if (table)
-                               BIO_printf(out, "%s\t%s\n", passwd, hash);
-                       else
-                               BIO_printf(out, "%s\n", hash);
+                       if (*salt_malloc_p == NULL)
+                               {
+                               *salt_p = *salt_malloc_p = OPENSSL_malloc(3);
+                               if (*salt_malloc_p == NULL)
+                                       goto err;
+                               }
+                       if (RAND_pseudo_bytes((unsigned char *)*salt_p, 2) < 0)
+                               goto err;
+                       (*salt_p)[0] = cov_2char[(*salt_p)[0] & 0x3f]; /* 6 bits */
+                       (*salt_p)[1] = cov_2char[(*salt_p)[1] & 0x3f]; /* 6 bits */
+                       (*salt_p)[2] = 0;
+#ifdef CHARSET_EBCDIC
+                       ascii2ebcdic(*salt_p, *salt_p, 2); /* des_crypt will convert
+                                                           * back to ASCII */
+#endif
                        }
-               /* else if (algo2) { ... } else if (algo3) { ... } */
-               else
-                       assert(0);
+#endif /* !OPENSSL_NO_DES */
+
+#ifndef NO_MD5CRYPT_1
+               if (use1 || useapr1)
+                       {
+                       int i;
+                       
+                       if (*salt_malloc_p == NULL)
+                               {
+                               *salt_p = *salt_malloc_p = OPENSSL_malloc(9);
+                               if (*salt_malloc_p == NULL)
+                                       goto err;
+                               }
+                       if (RAND_pseudo_bytes((unsigned char *)*salt_p, 8) < 0)
+                               goto err;
+                       
+                       for (i = 0; i < 8; i++)
+                               (*salt_p)[i] = cov_2char[(*salt_p)[i] & 0x3f]; /* 6 bits */
+                       (*salt_p)[8] = 0;
+                       }
+#endif /* !NO_MD5CRYPT_1 */
                }
-       while (*passwds != NULL);
+       
+       assert(*salt_p != NULL);
+       
+       /* truncate password if necessary */
+       if ((strlen(passwd) > pw_maxlen))
+               {
+               if (!quiet)
+                       /* XXX: really we should know how to print a size_t, not cast it */
+                       BIO_printf(bio_err, "Warning: truncating password to %u characters\n", (unsigned)pw_maxlen);
+               passwd[pw_maxlen] = 0;
+               }
+       assert(strlen(passwd) <= pw_maxlen);
+       
+       /* now compute password hash */
+#ifndef OPENSSL_NO_DES
+       if (usecrypt)
+               hash = DES_crypt(passwd, *salt_p);
+#endif
+#ifndef NO_MD5CRYPT_1
+       if (use1 || useapr1)
+               hash = md5crypt(passwd, (use1 ? "1" : "apr1"), *salt_p);
+#endif
+       assert(hash != NULL);
+
+       if (table && !reverse)
+               BIO_printf(out, "%s\t%s\n", passwd, hash);
+       else if (table && reverse)
+               BIO_printf(out, "%s\t%s\n", hash, passwd);
+       else
+               BIO_printf(out, "%s\n", hash);
+       return 1;
        
 err:
-       ERR_print_errors(bio_err);
-       if (salt_malloc)
-               Free(salt_malloc);
-       if (passwd_malloc)
-               Free(passwd_malloc);
-       if (out)
-               BIO_free(out);
-       EXIT(ret);
+       return 0;
+       }
+#else
+
+int MAIN(int argc, char **argv)
+       {
+       fputs("Program not available.\n", stderr)
+       OPENSSL_EXIT(1);
        }
 #endif