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 <stdio.h>
11 #include <string.h>
12 #include <stdlib.h>
13 #include <openssl/bio.h>
14 #include <openssl/crypto.h>
15 #include <openssl/trace.h>
16 #include <openssl/lhash.h>
17 #include <openssl/conf.h>
18 #include <openssl/x509.h>
19 #include <openssl/pem.h>
20 #include <openssl/ssl.h>
21 #ifndef OPENSSL_NO_ENGINE
22 # include <openssl/engine.h>
23 #endif
24 #include <openssl/err.h>
25 /* Needed to get the other O_xxx flags. */
26 #ifdef OPENSSL_SYS_VMS
27 # include <unixio.h>
28 #endif
29 #include "apps.h"
30 #include "progs.h"
31 
32 /*
33  * The LHASH callbacks ("hash" & "cmp") have been replaced by functions with
34  * the base prototypes (we cast each variable inside the function to the
35  * required type of "FUNCTION*"). This removes the necessity for
36  * macro-generated wrapper functions.
37  */
38 static LHASH_OF(FUNCTION) *prog_init(void);
39 static int do_cmd(LHASH_OF(FUNCTION) *prog, int argc, char *argv[]);
40 char *default_config_file = NULL;
41 
42 BIO *bio_in = NULL;
43 BIO *bio_out = NULL;
44 BIO *bio_err = NULL;
45 
warn_deprecated(const FUNCTION * fp)46 static void warn_deprecated(const FUNCTION *fp)
47 {
48     if (fp->deprecated_version != NULL)
49         BIO_printf(bio_err, "The command %s was deprecated in version %s.",
50                    fp->name, fp->deprecated_version);
51     else
52         BIO_printf(bio_err, "The command %s is deprecated.", fp->name);
53     if (strcmp(fp->deprecated_alternative, DEPRECATED_NO_ALTERNATIVE) != 0)
54         BIO_printf(bio_err, " Use '%s' instead.", fp->deprecated_alternative);
55     BIO_printf(bio_err, "\n");
56 }
57 
apps_startup(void)58 static int apps_startup(void)
59 {
60     const char *use_libctx = NULL;
61 #ifdef SIGPIPE
62     signal(SIGPIPE, SIG_IGN);
63 #endif
64 
65     /* Set non-default library initialisation settings */
66     if (!OPENSSL_init_ssl(OPENSSL_INIT_ENGINE_ALL_BUILTIN
67                           | OPENSSL_INIT_LOAD_CONFIG, NULL))
68         return 0;
69 
70     (void)setup_ui_method();
71     (void)setup_engine_loader();
72 
73     /*
74      * NOTE: This is an undocumented feature required for testing only.
75      * There are no guarantees that it will exist in future builds.
76      */
77     use_libctx = getenv("OPENSSL_TEST_LIBCTX");
78     if (use_libctx != NULL) {
79         /* Set this to "1" to create a global libctx */
80         if (strcmp(use_libctx, "1") == 0) {
81             if (app_create_libctx() == NULL)
82                 return 0;
83         }
84     }
85 
86     return 1;
87 }
88 
apps_shutdown(void)89 static void apps_shutdown(void)
90 {
91     app_providers_cleanup();
92     OSSL_LIB_CTX_free(app_get0_libctx());
93     destroy_engine_loader();
94     destroy_ui_method();
95 }
96 
97 
98 #ifndef OPENSSL_NO_TRACE
99 typedef struct tracedata_st {
100     BIO *bio;
101     unsigned int ingroup:1;
102 } tracedata;
103 
internal_trace_cb(const char * buf,size_t cnt,int category,int cmd,void * vdata)104 static size_t internal_trace_cb(const char *buf, size_t cnt,
105                                 int category, int cmd, void *vdata)
106 {
107     int ret = 0;
108     tracedata *trace_data = vdata;
109     char buffer[256], *hex;
110     CRYPTO_THREAD_ID tid;
111 
112     switch (cmd) {
113     case OSSL_TRACE_CTRL_BEGIN:
114         if (trace_data->ingroup) {
115             BIO_printf(bio_err, "ERROR: tracing already started\n");
116             return 0;
117         }
118         trace_data->ingroup = 1;
119 
120         tid = CRYPTO_THREAD_get_current_id();
121         hex = OPENSSL_buf2hexstr((const unsigned char *)&tid, sizeof(tid));
122         BIO_snprintf(buffer, sizeof(buffer), "TRACE[%s]:%s: ",
123                      hex == NULL ? "<null>" : hex,
124                      OSSL_trace_get_category_name(category));
125         OPENSSL_free(hex);
126         BIO_set_prefix(trace_data->bio, buffer);
127         break;
128     case OSSL_TRACE_CTRL_WRITE:
129         if (!trace_data->ingroup) {
130             BIO_printf(bio_err, "ERROR: writing when tracing not started\n");
131             return 0;
132         }
133 
134         ret = BIO_write(trace_data->bio, buf, cnt);
135         break;
136     case OSSL_TRACE_CTRL_END:
137         if (!trace_data->ingroup) {
138             BIO_printf(bio_err, "ERROR: finishing when tracing not started\n");
139             return 0;
140         }
141         trace_data->ingroup = 0;
142 
143         BIO_set_prefix(trace_data->bio, NULL);
144 
145         break;
146     }
147 
148     return ret < 0 ? 0 : ret;
149 }
150 
151 DEFINE_STACK_OF(tracedata)
152 static STACK_OF(tracedata) *trace_data_stack;
153 
tracedata_free(tracedata * data)154 static void tracedata_free(tracedata *data)
155 {
156     BIO_free_all(data->bio);
157     OPENSSL_free(data);
158 }
159 
STACK_OF(tracedata)160 static STACK_OF(tracedata) *trace_data_stack;
161 
162 static void cleanup_trace(void)
163 {
164     sk_tracedata_pop_free(trace_data_stack, tracedata_free);
165 }
166 
setup_trace_category(int category)167 static void setup_trace_category(int category)
168 {
169     BIO *channel;
170     tracedata *trace_data;
171     BIO *bio = NULL;
172 
173     if (OSSL_trace_enabled(category))
174         return;
175 
176     bio = BIO_new(BIO_f_prefix());
177     channel = BIO_push(bio, dup_bio_err(FORMAT_TEXT));
178     trace_data = OPENSSL_zalloc(sizeof(*trace_data));
179 
180     if (trace_data == NULL
181         || bio == NULL
182         || (trace_data->bio = channel) == NULL
183         || OSSL_trace_set_callback(category, internal_trace_cb,
184                                    trace_data) == 0
185         || sk_tracedata_push(trace_data_stack, trace_data) == 0) {
186 
187         fprintf(stderr,
188                 "warning: unable to setup trace callback for category '%s'.\n",
189                 OSSL_trace_get_category_name(category));
190 
191         OSSL_trace_set_callback(category, NULL, NULL);
192         BIO_free_all(channel);
193     }
194 }
195 
setup_trace(const char * str)196 static void setup_trace(const char *str)
197 {
198     char *val;
199 
200     /*
201      * We add this handler as early as possible to ensure it's executed
202      * as late as possible, i.e. after the TRACE code has done its cleanup
203      * (which happens last in OPENSSL_cleanup).
204      */
205     atexit(cleanup_trace);
206 
207     trace_data_stack = sk_tracedata_new_null();
208     val = OPENSSL_strdup(str);
209 
210     if (val != NULL) {
211         char *valp = val;
212         char *item;
213 
214         for (valp = val; (item = strtok(valp, ",")) != NULL; valp = NULL) {
215             int category = OSSL_trace_get_category_num(item);
216 
217             if (category == OSSL_TRACE_CATEGORY_ALL) {
218                 while (++category < OSSL_TRACE_CATEGORY_NUM)
219                     setup_trace_category(category);
220                 break;
221             } else if (category > 0) {
222                 setup_trace_category(category);
223             } else {
224                 fprintf(stderr,
225                         "warning: unknown trace category: '%s'.\n", item);
226             }
227         }
228     }
229 
230     OPENSSL_free(val);
231 }
232 #endif /* OPENSSL_NO_TRACE */
233 
234 static char *help_argv[] = { "help", NULL };
235 
main(int argc,char * argv[])236 int main(int argc, char *argv[])
237 {
238     FUNCTION f, *fp;
239     LHASH_OF(FUNCTION) *prog = NULL;
240     char *pname;
241     const char *fname;
242     ARGS arg;
243     int global_help = 0;
244     int ret = 0;
245 
246     arg.argv = NULL;
247     arg.size = 0;
248 
249     /* Set up some of the environment. */
250     bio_in = dup_bio_in(FORMAT_TEXT);
251     bio_out = dup_bio_out(FORMAT_TEXT);
252     bio_err = dup_bio_err(FORMAT_TEXT);
253 
254 #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
255     argv = copy_argv(&argc, argv);
256 #elif defined(_WIN32)
257     /* Replace argv[] with UTF-8 encoded strings. */
258     win32_utf8argv(&argc, &argv);
259 #endif
260 
261 #ifndef OPENSSL_NO_TRACE
262     setup_trace(getenv("OPENSSL_TRACE"));
263 #endif
264 
265     if ((fname = "apps_startup", !apps_startup())
266             || (fname = "prog_init", (prog = prog_init()) == NULL)) {
267         BIO_printf(bio_err,
268                    "FATAL: Startup failure (dev note: %s()) for %s\n",
269                    fname, argv[0]);
270         ERR_print_errors(bio_err);
271         ret = 1;
272         goto end;
273     }
274     pname = opt_progname(argv[0]);
275 
276     default_config_file = CONF_get1_default_config_file();
277     if (default_config_file == NULL)
278         app_bail_out("%s: could not get default config file\n", pname);
279 
280     /* first check the program name */
281     f.name = pname;
282     fp = lh_FUNCTION_retrieve(prog, &f);
283     if (fp == NULL) {
284         /* We assume we've been called as 'openssl ...' */
285         global_help = argc > 1
286             && (strcmp(argv[1], "-help") == 0 || strcmp(argv[1], "--help") == 0
287                 || strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--h") == 0);
288         argc--;
289         argv++;
290         opt_appname(argc == 1 || global_help ? "help" : argv[0]);
291     } else {
292         argv[0] = pname;
293     }
294 
295     /* If there's a command, run with that, otherwise "help". */
296     ret = argc == 0 || global_help
297         ? do_cmd(prog, 1, help_argv)
298         : do_cmd(prog, argc, argv);
299 
300  end:
301     OPENSSL_free(default_config_file);
302     lh_FUNCTION_free(prog);
303     OPENSSL_free(arg.argv);
304     if (!app_RAND_write())
305         ret = EXIT_FAILURE;
306 
307     BIO_free(bio_in);
308     BIO_free_all(bio_out);
309     apps_shutdown();
310     BIO_free(bio_err);
311     EXIT(ret);
312 }
313 
314 typedef enum HELP_CHOICE {
315     OPT_hERR = -1, OPT_hEOF = 0, OPT_hHELP
316 } HELP_CHOICE;
317 
318 const OPTIONS help_options[] = {
319     {OPT_HELP_STR, 1, '-', "Usage: help [options] [command]\n"},
320 
321     OPT_SECTION("General"),
322     {"help", OPT_hHELP, '-', "Display this summary"},
323 
324     OPT_PARAMETERS(),
325     {"command", 0, 0, "Name of command to display help (optional)"},
326     {NULL}
327 };
328 
329 
help_main(int argc,char ** argv)330 int help_main(int argc, char **argv)
331 {
332     FUNCTION *fp;
333     int i, nl;
334     FUNC_TYPE tp;
335     char *prog;
336     HELP_CHOICE o;
337     DISPLAY_COLUMNS dc;
338     char *new_argv[3];
339 
340     prog = opt_init(argc, argv, help_options);
341     while ((o = opt_next()) != OPT_hEOF) {
342         switch (o) {
343         case OPT_hERR:
344         case OPT_hEOF:
345             BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
346             return 1;
347         case OPT_hHELP:
348             opt_help(help_options);
349             return 0;
350         }
351     }
352 
353     /* One optional argument, the command to get help for. */
354     if (opt_num_rest() == 1) {
355         new_argv[0] = opt_rest()[0];
356         new_argv[1] = "--help";
357         new_argv[2] = NULL;
358         return do_cmd(prog_init(), 2, new_argv);
359     }
360     if (opt_num_rest() != 0) {
361         BIO_printf(bio_err, "Usage: %s\n", prog);
362         return 1;
363     }
364 
365     calculate_columns(functions, &dc);
366     BIO_printf(bio_err, "%s:\n\nStandard commands", prog);
367     i = 0;
368     tp = FT_none;
369     for (fp = functions; fp->name != NULL; fp++) {
370         nl = 0;
371         if (i++ % dc.columns == 0) {
372             BIO_printf(bio_err, "\n");
373             nl = 1;
374         }
375         if (fp->type != tp) {
376             tp = fp->type;
377             if (!nl)
378                 BIO_printf(bio_err, "\n");
379             if (tp == FT_md) {
380                 i = 1;
381                 BIO_printf(bio_err,
382                            "\nMessage Digest commands (see the `dgst' command for more details)\n");
383             } else if (tp == FT_cipher) {
384                 i = 1;
385                 BIO_printf(bio_err,
386                            "\nCipher commands (see the `enc' command for more details)\n");
387             }
388         }
389         BIO_printf(bio_err, "%-*s", dc.width, fp->name);
390     }
391     BIO_printf(bio_err, "\n\n");
392     return 0;
393 }
394 
do_cmd(LHASH_OF (FUNCTION)* prog,int argc,char * argv[])395 static int do_cmd(LHASH_OF(FUNCTION) *prog, int argc, char *argv[])
396 {
397     FUNCTION f, *fp;
398 
399     if (argc <= 0 || argv[0] == NULL)
400         return 0;
401     memset(&f, 0, sizeof(f));
402     f.name = argv[0];
403     fp = lh_FUNCTION_retrieve(prog, &f);
404     if (fp == NULL) {
405         if (EVP_get_digestbyname(argv[0])) {
406             f.type = FT_md;
407             f.func = dgst_main;
408             fp = &f;
409         } else if (EVP_get_cipherbyname(argv[0])) {
410             f.type = FT_cipher;
411             f.func = enc_main;
412             fp = &f;
413         }
414     }
415     if (fp != NULL) {
416         if (fp->deprecated_alternative != NULL)
417             warn_deprecated(fp);
418         return fp->func(argc, argv);
419     }
420     if ((strncmp(argv[0], "no-", 3)) == 0) {
421         /*
422          * User is asking if foo is unsupported, by trying to "run" the
423          * no-foo command.  Strange.
424          */
425         f.name = argv[0] + 3;
426         if (lh_FUNCTION_retrieve(prog, &f) == NULL) {
427             BIO_printf(bio_out, "%s\n", argv[0]);
428             return 0;
429         }
430         BIO_printf(bio_out, "%s\n", argv[0] + 3);
431         return 1;
432     }
433 
434     BIO_printf(bio_err, "Invalid command '%s'; type \"help\" for a list.\n",
435                argv[0]);
436     return 1;
437 }
438 
function_cmp(const FUNCTION * a,const FUNCTION * b)439 static int function_cmp(const FUNCTION * a, const FUNCTION * b)
440 {
441     return strncmp(a->name, b->name, 8);
442 }
443 
function_hash(const FUNCTION * a)444 static unsigned long function_hash(const FUNCTION * a)
445 {
446     return OPENSSL_LH_strhash(a->name);
447 }
448 
SortFnByName(const void * _f1,const void * _f2)449 static int SortFnByName(const void *_f1, const void *_f2)
450 {
451     const FUNCTION *f1 = _f1;
452     const FUNCTION *f2 = _f2;
453 
454     if (f1->type != f2->type)
455         return f1->type - f2->type;
456     return strcmp(f1->name, f2->name);
457 }
458 
LHASH_OF(FUNCTION)459 static LHASH_OF(FUNCTION) *prog_init(void)
460 {
461     static LHASH_OF(FUNCTION) *ret = NULL;
462     static int prog_inited = 0;
463     FUNCTION *f;
464     size_t i;
465 
466     if (prog_inited)
467         return ret;
468 
469     prog_inited = 1;
470 
471     /* Sort alphabetically within category. For nicer help displays. */
472     for (i = 0, f = functions; f->name != NULL; ++f, ++i)
473         ;
474     qsort(functions, i, sizeof(*functions), SortFnByName);
475 
476     if ((ret = lh_FUNCTION_new(function_hash, function_cmp)) == NULL)
477         return NULL;
478 
479     for (f = functions; f->name != NULL; f++)
480         (void)lh_FUNCTION_insert(ret, f);
481     return ret;
482 }
483