1 /*
2  * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
3  *
4  * Licensed under the OpenSSL license (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 <stdio.h>
11 #include <string.h>
12 #include "apps.h"
13 #include "progs.h"
14 #include <openssl/pem.h>
15 #include <openssl/err.h>
16 #include <openssl/evp.h>
17 #ifndef OPENSSL_NO_ENGINE
18 # include <openssl/engine.h>
19 #endif
20 
21 static int init_keygen_file(EVP_PKEY_CTX **pctx, const char *file, ENGINE *e);
22 static int genpkey_cb(EVP_PKEY_CTX *ctx);
23 
24 typedef enum OPTION_choice {
25     OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
26     OPT_ENGINE, OPT_OUTFORM, OPT_OUT, OPT_PASS, OPT_PARAMFILE,
27     OPT_ALGORITHM, OPT_PKEYOPT, OPT_GENPARAM, OPT_TEXT, OPT_CIPHER
28 } OPTION_CHOICE;
29 
30 const OPTIONS genpkey_options[] = {
31     {"help", OPT_HELP, '-', "Display this summary"},
32     {"out", OPT_OUT, '>', "Output file"},
33     {"outform", OPT_OUTFORM, 'F', "output format (DER or PEM)"},
34     {"pass", OPT_PASS, 's', "Output file pass phrase source"},
35     {"paramfile", OPT_PARAMFILE, '<', "Parameters file"},
36     {"algorithm", OPT_ALGORITHM, 's', "The public key algorithm"},
37     {"pkeyopt", OPT_PKEYOPT, 's',
38      "Set the public key algorithm option as opt:value"},
39     {"genparam", OPT_GENPARAM, '-', "Generate parameters, not key"},
40     {"text", OPT_TEXT, '-', "Print the in text"},
41     {"", OPT_CIPHER, '-', "Cipher to use to encrypt the key"},
42 #ifndef OPENSSL_NO_ENGINE
43     {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},
44 #endif
45     /* This is deliberately last. */
46     {OPT_HELP_STR, 1, 1,
47      "Order of options may be important!  See the documentation.\n"},
48     {NULL}
49 };
50 
genpkey_main(int argc,char ** argv)51 int genpkey_main(int argc, char **argv)
52 {
53     BIO *in = NULL, *out = NULL;
54     ENGINE *e = NULL;
55     EVP_PKEY *pkey = NULL;
56     EVP_PKEY_CTX *ctx = NULL;
57     char *outfile = NULL, *passarg = NULL, *pass = NULL, *prog;
58     const EVP_CIPHER *cipher = NULL;
59     OPTION_CHOICE o;
60     int outformat = FORMAT_PEM, text = 0, ret = 1, rv, do_param = 0;
61     int private = 0;
62 
63     prog = opt_init(argc, argv, genpkey_options);
64     while ((o = opt_next()) != OPT_EOF) {
65         switch (o) {
66         case OPT_EOF:
67         case OPT_ERR:
68  opthelp:
69             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
70             goto end;
71         case OPT_HELP:
72             ret = 0;
73             opt_help(genpkey_options);
74             goto end;
75         case OPT_OUTFORM:
76             if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &outformat))
77                 goto opthelp;
78             break;
79         case OPT_OUT:
80             outfile = opt_arg();
81             break;
82         case OPT_PASS:
83             passarg = opt_arg();
84             break;
85         case OPT_ENGINE:
86             e = setup_engine(opt_arg(), 0);
87             break;
88         case OPT_PARAMFILE:
89             if (do_param == 1)
90                 goto opthelp;
91             if (!init_keygen_file(&ctx, opt_arg(), e))
92                 goto end;
93             break;
94         case OPT_ALGORITHM:
95             if (!init_gen_str(&ctx, opt_arg(), e, do_param))
96                 goto end;
97             break;
98         case OPT_PKEYOPT:
99             if (ctx == NULL) {
100                 BIO_printf(bio_err, "%s: No keytype specified.\n", prog);
101                 goto opthelp;
102             }
103             if (pkey_ctrl_string(ctx, opt_arg()) <= 0) {
104                 BIO_printf(bio_err,
105                            "%s: Error setting %s parameter:\n",
106                            prog, opt_arg());
107                 ERR_print_errors(bio_err);
108                 goto end;
109             }
110             break;
111         case OPT_GENPARAM:
112             if (ctx != NULL)
113                 goto opthelp;
114             do_param = 1;
115             break;
116         case OPT_TEXT:
117             text = 1;
118             break;
119         case OPT_CIPHER:
120             if (!opt_cipher(opt_unknown(), &cipher)
121                 || do_param == 1)
122                 goto opthelp;
123             if (EVP_CIPHER_mode(cipher) == EVP_CIPH_GCM_MODE ||
124                 EVP_CIPHER_mode(cipher) == EVP_CIPH_CCM_MODE ||
125                 EVP_CIPHER_mode(cipher) == EVP_CIPH_XTS_MODE ||
126                 EVP_CIPHER_mode(cipher) == EVP_CIPH_OCB_MODE) {
127                 BIO_printf(bio_err, "%s: cipher mode not supported\n", prog);
128                 goto end;
129             }
130         }
131     }
132     argc = opt_num_rest();
133     if (argc != 0)
134         goto opthelp;
135 
136     private = do_param ? 0 : 1;
137 
138     if (ctx == NULL)
139         goto opthelp;
140 
141     if (!app_passwd(passarg, NULL, &pass, NULL)) {
142         BIO_puts(bio_err, "Error getting password\n");
143         goto end;
144     }
145 
146     out = bio_open_owner(outfile, outformat, private);
147     if (out == NULL)
148         goto end;
149 
150     EVP_PKEY_CTX_set_cb(ctx, genpkey_cb);
151     EVP_PKEY_CTX_set_app_data(ctx, bio_err);
152 
153     if (do_param) {
154         if (EVP_PKEY_paramgen(ctx, &pkey) <= 0) {
155             BIO_puts(bio_err, "Error generating parameters\n");
156             ERR_print_errors(bio_err);
157             goto end;
158         }
159     } else {
160         if (EVP_PKEY_keygen(ctx, &pkey) <= 0) {
161             BIO_puts(bio_err, "Error generating key\n");
162             ERR_print_errors(bio_err);
163             goto end;
164         }
165     }
166 
167     if (do_param) {
168         rv = PEM_write_bio_Parameters(out, pkey);
169     } else if (outformat == FORMAT_PEM) {
170         assert(private);
171         rv = PEM_write_bio_PrivateKey(out, pkey, cipher, NULL, 0, NULL, pass);
172     } else if (outformat == FORMAT_ASN1) {
173         assert(private);
174         rv = i2d_PrivateKey_bio(out, pkey);
175     } else {
176         BIO_printf(bio_err, "Bad format specified for key\n");
177         goto end;
178     }
179 
180     ret = 0;
181 
182     if (rv <= 0) {
183         BIO_puts(bio_err, "Error writing key\n");
184         ERR_print_errors(bio_err);
185         ret = 1;
186     }
187 
188     if (text) {
189         if (do_param)
190             rv = EVP_PKEY_print_params(out, pkey, 0, NULL);
191         else
192             rv = EVP_PKEY_print_private(out, pkey, 0, NULL);
193 
194         if (rv <= 0) {
195             BIO_puts(bio_err, "Error printing key\n");
196             ERR_print_errors(bio_err);
197             ret = 1;
198         }
199     }
200 
201  end:
202     EVP_PKEY_free(pkey);
203     EVP_PKEY_CTX_free(ctx);
204     BIO_free_all(out);
205     BIO_free(in);
206     release_engine(e);
207     OPENSSL_free(pass);
208     return ret;
209 }
210 
init_keygen_file(EVP_PKEY_CTX ** pctx,const char * file,ENGINE * e)211 static int init_keygen_file(EVP_PKEY_CTX **pctx, const char *file, ENGINE *e)
212 {
213     BIO *pbio;
214     EVP_PKEY *pkey = NULL;
215     EVP_PKEY_CTX *ctx = NULL;
216     if (*pctx) {
217         BIO_puts(bio_err, "Parameters already set!\n");
218         return 0;
219     }
220 
221     pbio = BIO_new_file(file, "r");
222     if (!pbio) {
223         BIO_printf(bio_err, "Can't open parameter file %s\n", file);
224         return 0;
225     }
226 
227     pkey = PEM_read_bio_Parameters(pbio, NULL);
228     BIO_free(pbio);
229 
230     if (!pkey) {
231         BIO_printf(bio_err, "Error reading parameter file %s\n", file);
232         return 0;
233     }
234 
235     ctx = EVP_PKEY_CTX_new(pkey, e);
236     if (ctx == NULL)
237         goto err;
238     if (EVP_PKEY_keygen_init(ctx) <= 0)
239         goto err;
240     EVP_PKEY_free(pkey);
241     *pctx = ctx;
242     return 1;
243 
244  err:
245     BIO_puts(bio_err, "Error initializing context\n");
246     ERR_print_errors(bio_err);
247     EVP_PKEY_CTX_free(ctx);
248     EVP_PKEY_free(pkey);
249     return 0;
250 
251 }
252 
init_gen_str(EVP_PKEY_CTX ** pctx,const char * algname,ENGINE * e,int do_param)253 int init_gen_str(EVP_PKEY_CTX **pctx,
254                  const char *algname, ENGINE *e, int do_param)
255 {
256     EVP_PKEY_CTX *ctx = NULL;
257     const EVP_PKEY_ASN1_METHOD *ameth;
258     ENGINE *tmpeng = NULL;
259     int pkey_id;
260 
261     if (*pctx) {
262         BIO_puts(bio_err, "Algorithm already set!\n");
263         return 0;
264     }
265 
266     ameth = EVP_PKEY_asn1_find_str(&tmpeng, algname, -1);
267 
268 #ifndef OPENSSL_NO_ENGINE
269     if (!ameth && e)
270         ameth = ENGINE_get_pkey_asn1_meth_str(e, algname, -1);
271 #endif
272 
273     if (!ameth) {
274         BIO_printf(bio_err, "Algorithm %s not found\n", algname);
275         return 0;
276     }
277 
278     ERR_clear_error();
279 
280     EVP_PKEY_asn1_get0_info(&pkey_id, NULL, NULL, NULL, NULL, ameth);
281 #ifndef OPENSSL_NO_ENGINE
282     ENGINE_finish(tmpeng);
283 #endif
284     ctx = EVP_PKEY_CTX_new_id(pkey_id, e);
285 
286     if (!ctx)
287         goto err;
288     if (do_param) {
289         if (EVP_PKEY_paramgen_init(ctx) <= 0)
290             goto err;
291     } else {
292         if (EVP_PKEY_keygen_init(ctx) <= 0)
293             goto err;
294     }
295 
296     *pctx = ctx;
297     return 1;
298 
299  err:
300     BIO_printf(bio_err, "Error initializing %s context\n", algname);
301     ERR_print_errors(bio_err);
302     EVP_PKEY_CTX_free(ctx);
303     return 0;
304 
305 }
306 
genpkey_cb(EVP_PKEY_CTX * ctx)307 static int genpkey_cb(EVP_PKEY_CTX *ctx)
308 {
309     char c = '*';
310     BIO *b = EVP_PKEY_CTX_get_app_data(ctx);
311     int p;
312     p = EVP_PKEY_CTX_get_keygen_info(ctx, 0);
313     if (p == 0)
314         c = '.';
315     if (p == 1)
316         c = '+';
317     if (p == 2)
318         c = '*';
319     if (p == 3)
320         c = '\n';
321     BIO_write(b, &c, 1);
322     (void)BIO_flush(b);
323     return 1;
324 }
325