1 /*
2  * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the Apache License 2.0 (the "License").  You may not use
5  * this file except in compliance with the License.  You can obtain a copy
6  * in the file LICENSE in the source distribution or at
7  * https://www.openssl.org/source/license.html
8  */
9 
10 #include <openssl/opensslconf.h>
11 
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <time.h>
16 #include "apps.h"
17 #include "progs.h"
18 #include <openssl/bio.h>
19 #include <openssl/err.h>
20 #include <openssl/dsa.h>
21 #include <openssl/evp.h>
22 #include <openssl/x509.h>
23 #include <openssl/pem.h>
24 #include <openssl/bn.h>
25 #include <openssl/encoder.h>
26 #include <openssl/core_names.h>
27 #include <openssl/core_dispatch.h>
28 
29 #ifndef OPENSSL_NO_RC4
30 # define DEFAULT_PVK_ENCR_STRENGTH      2
31 #else
32 # define DEFAULT_PVK_ENCR_STRENGTH      0
33 #endif
34 
35 typedef enum OPTION_choice {
36     OPT_COMMON,
37     OPT_INFORM, OPT_OUTFORM, OPT_IN, OPT_OUT, OPT_ENGINE,
38     /* Do not change the order here; see case statements below */
39     OPT_PVK_NONE, OPT_PVK_WEAK, OPT_PVK_STRONG,
40     OPT_NOOUT, OPT_TEXT, OPT_MODULUS, OPT_PUBIN,
41     OPT_PUBOUT, OPT_CIPHER, OPT_PASSIN, OPT_PASSOUT,
42     OPT_PROV_ENUM
43 } OPTION_CHOICE;
44 
45 const OPTIONS dsa_options[] = {
46     OPT_SECTION("General"),
47     {"help", OPT_HELP, '-', "Display this summary"},
48     {"", OPT_CIPHER, '-', "Any supported cipher"},
49 #ifndef OPENSSL_NO_RC4
50     {"pvk-strong", OPT_PVK_STRONG, '-', "Enable 'Strong' PVK encoding level (default)"},
51     {"pvk-weak", OPT_PVK_WEAK, '-', "Enable 'Weak' PVK encoding level"},
52     {"pvk-none", OPT_PVK_NONE, '-', "Don't enforce PVK encoding"},
53 #endif
54 #ifndef OPENSSL_NO_ENGINE
55     {"engine", OPT_ENGINE, 's', "Use engine e, possibly a hardware device"},
56 #endif
57 
58     OPT_SECTION("Input"),
59     {"in", OPT_IN, 's', "Input key"},
60     {"inform", OPT_INFORM, 'f', "Input format (DER/PEM/PVK); has no effect"},
61     {"pubin", OPT_PUBIN, '-', "Expect a public key in input file"},
62     {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},
63 
64     OPT_SECTION("Output"),
65     {"out", OPT_OUT, '>', "Output file"},
66     {"outform", OPT_OUTFORM, 'f', "Output format, DER PEM PVK"},
67     {"noout", OPT_NOOUT, '-', "Don't print key out"},
68     {"text", OPT_TEXT, '-', "Print the key in text"},
69     {"modulus", OPT_MODULUS, '-', "Print the DSA public value"},
70     {"pubout", OPT_PUBOUT, '-', "Output public key, not private"},
71     {"passout", OPT_PASSOUT, 's', "Output file pass phrase source"},
72 
73     OPT_PROV_OPTIONS,
74     {NULL}
75 };
76 
dsa_main(int argc,char ** argv)77 int dsa_main(int argc, char **argv)
78 {
79     BIO *out = NULL;
80     ENGINE *e = NULL;
81     EVP_PKEY *pkey = NULL;
82     EVP_CIPHER *enc = NULL;
83     char *infile = NULL, *outfile = NULL, *prog;
84     char *passin = NULL, *passout = NULL, *passinarg = NULL, *passoutarg = NULL;
85     OPTION_CHOICE o;
86     int informat = FORMAT_UNDEF, outformat = FORMAT_PEM, text = 0, noout = 0;
87     int modulus = 0, pubin = 0, pubout = 0, ret = 1;
88     int pvk_encr = DEFAULT_PVK_ENCR_STRENGTH;
89     int private = 0;
90     const char *output_type = NULL, *ciphername = NULL;
91     const char *output_structure = NULL;
92     int selection = 0;
93     OSSL_ENCODER_CTX *ectx = NULL;
94 
95     prog = opt_init(argc, argv, dsa_options);
96     while ((o = opt_next()) != OPT_EOF) {
97         switch (o) {
98         case OPT_EOF:
99         case OPT_ERR:
100  opthelp:
101             ret = 0;
102             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
103             goto end;
104         case OPT_HELP:
105             opt_help(dsa_options);
106             ret = 0;
107             goto end;
108         case OPT_INFORM:
109             if (!opt_format(opt_arg(), OPT_FMT_ANY, &informat))
110                 goto opthelp;
111             break;
112         case OPT_IN:
113             infile = opt_arg();
114             break;
115         case OPT_OUTFORM:
116             if (!opt_format(opt_arg(), OPT_FMT_ANY, &outformat))
117                 goto opthelp;
118             break;
119         case OPT_OUT:
120             outfile = opt_arg();
121             break;
122         case OPT_ENGINE:
123             e = setup_engine(opt_arg(), 0);
124             break;
125         case OPT_PASSIN:
126             passinarg = opt_arg();
127             break;
128         case OPT_PASSOUT:
129             passoutarg = opt_arg();
130             break;
131         case OPT_PVK_STRONG:    /* pvk_encr:= 2 */
132         case OPT_PVK_WEAK:      /* pvk_encr:= 1 */
133         case OPT_PVK_NONE:      /* pvk_encr:= 0 */
134 #ifndef OPENSSL_NO_RC4
135             pvk_encr = (o - OPT_PVK_NONE);
136 #endif
137             break;
138         case OPT_NOOUT:
139             noout = 1;
140             break;
141         case OPT_TEXT:
142             text = 1;
143             break;
144         case OPT_MODULUS:
145             modulus = 1;
146             break;
147         case OPT_PUBIN:
148             pubin = 1;
149             break;
150         case OPT_PUBOUT:
151             pubout = 1;
152             break;
153         case OPT_CIPHER:
154             ciphername = opt_unknown();
155             break;
156         case OPT_PROV_CASES:
157             if (!opt_provider(o))
158                 goto end;
159             break;
160         }
161     }
162 
163     /* No extra args. */
164     argc = opt_num_rest();
165     if (argc != 0)
166         goto opthelp;
167 
168     if (ciphername != NULL) {
169         if (!opt_cipher(ciphername, &enc))
170             goto end;
171     }
172     private = pubin || pubout ? 0 : 1;
173     if (text && !pubin)
174         private = 1;
175 
176     if (!app_passwd(passinarg, passoutarg, &passin, &passout)) {
177         BIO_printf(bio_err, "Error getting passwords\n");
178         goto end;
179     }
180 
181     BIO_printf(bio_err, "read DSA key\n");
182     if (pubin)
183         pkey = load_pubkey(infile, informat, 1, passin, e, "public key");
184     else
185         pkey = load_key(infile, informat, 1, passin, e, "private key");
186 
187     if (pkey == NULL) {
188         BIO_printf(bio_err, "unable to load Key\n");
189         ERR_print_errors(bio_err);
190         goto end;
191     }
192     if (!EVP_PKEY_is_a(pkey, "DSA")) {
193         BIO_printf(bio_err, "Not a DSA key\n");
194         goto end;
195     }
196 
197     out = bio_open_owner(outfile, outformat, private);
198     if (out == NULL)
199         goto end;
200 
201     if (text) {
202         assert(pubin || private);
203         if ((pubin && EVP_PKEY_print_public(out, pkey, 0, NULL) <= 0)
204             || (!pubin && EVP_PKEY_print_private(out, pkey, 0, NULL) <= 0)) {
205             perror(outfile);
206             ERR_print_errors(bio_err);
207             goto end;
208         }
209     }
210 
211     if (modulus) {
212         BIGNUM *pub_key = NULL;
213 
214         if (!EVP_PKEY_get_bn_param(pkey, "pub", &pub_key)) {
215             ERR_print_errors(bio_err);
216             goto end;
217         }
218         BIO_printf(out, "Public Key=");
219         BN_print(out, pub_key);
220         BIO_printf(out, "\n");
221         BN_free(pub_key);
222     }
223 
224     if (noout) {
225         ret = 0;
226         goto end;
227     }
228     BIO_printf(bio_err, "writing DSA key\n");
229     if (outformat == FORMAT_ASN1) {
230         output_type = "DER";
231     } else if (outformat == FORMAT_PEM) {
232         output_type = "PEM";
233     } else if (outformat == FORMAT_MSBLOB) {
234         output_type = "MSBLOB";
235     } else if (outformat == FORMAT_PVK) {
236         if (pubin) {
237             BIO_printf(bio_err, "PVK form impossible with public key input\n");
238             goto end;
239         }
240         output_type = "PVK";
241     } else {
242         BIO_printf(bio_err, "bad output format specified for outfile\n");
243         goto end;
244     }
245 
246     if (outformat == FORMAT_ASN1 || outformat == FORMAT_PEM) {
247         if (pubout || pubin)
248             output_structure = "SubjectPublicKeyInfo";
249         else
250             output_structure = "type-specific";
251     }
252 
253     /* Select what you want in the output */
254     if (pubout || pubin) {
255         selection = OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
256     } else {
257         assert(private);
258         selection = (OSSL_KEYMGMT_SELECT_KEYPAIR
259                      | OSSL_KEYMGMT_SELECT_ALL_PARAMETERS);
260     }
261 
262     /* Perform the encoding */
263     ectx = OSSL_ENCODER_CTX_new_for_pkey(pkey, selection, output_type,
264                                          output_structure, NULL);
265     if (OSSL_ENCODER_CTX_get_num_encoders(ectx) == 0) {
266         BIO_printf(bio_err, "%s format not supported\n", output_type);
267         goto end;
268     }
269 
270     /* Passphrase setup */
271     if (enc != NULL)
272         OSSL_ENCODER_CTX_set_cipher(ectx, EVP_CIPHER_get0_name(enc), NULL);
273 
274     /* Default passphrase prompter */
275     if (enc != NULL || outformat == FORMAT_PVK) {
276         OSSL_ENCODER_CTX_set_passphrase_ui(ectx, get_ui_method(), NULL);
277         if (passout != NULL)
278             /* When passout given, override the passphrase prompter */
279             OSSL_ENCODER_CTX_set_passphrase(ectx,
280                                             (const unsigned char *)passout,
281                                             strlen(passout));
282     }
283 
284     /* PVK requires a bit more */
285     if (outformat == FORMAT_PVK) {
286         OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
287 
288         params[0] = OSSL_PARAM_construct_int("encrypt-level", &pvk_encr);
289         if (!OSSL_ENCODER_CTX_set_params(ectx, params)) {
290             BIO_printf(bio_err, "invalid PVK encryption level\n");
291             goto end;
292         }
293     }
294 
295     if (!OSSL_ENCODER_to_bio(ectx, out)) {
296         BIO_printf(bio_err, "unable to write key\n");
297         goto end;
298     }
299     ret = 0;
300  end:
301     if (ret != 0)
302         ERR_print_errors(bio_err);
303     OSSL_ENCODER_CTX_free(ectx);
304     BIO_free_all(out);
305     EVP_PKEY_free(pkey);
306     EVP_CIPHER_free(enc);
307     release_engine(e);
308     OPENSSL_free(passin);
309     OPENSSL_free(passout);
310     return ret;
311 }
312