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1/* $OpenBSD: boot.c,v 1.57 2023/02/23 19:48:22 miod Exp $ */
2
3/*
4 * Copyright (c) 2003 Dale Rahn
5 * Copyright (c) 1997,1998 Michael Shalayeff
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 */
30
31#include <sys/param.h>
32#include <sys/reboot.h>
33#include <sys/stat.h>
34#include <libsa.h>
35#include <lib/libsa/colorchar.h>
36#include <lib/libsa/loadfile.h>
37#include <lib/libkern/funcs.h>
38#include <lib/libsa/arc4.h>
39
40#include <stand/boot/bootarg.h>
41
42#include "cmd.h"
43
44#ifndef KERNEL
45#define KERNEL "/bsd"
46#endif
47
48char prog_ident[40];
49char *progname = "BOOT";
50
51extern const char version[];
52struct cmd_state cmd;
53
54/* bootprompt can be set by MD code to avoid prompt first time round */
55int bootprompt = 1;
56char *kernelfile = KERNEL; /* can be changed by MD code */
57int boottimeout = 5; /* can be changed by MD code */
58
59char rnddata[BOOTRANDOM_MAX] __aligned(sizeof(long));
60struct rc4_ctx randomctx;
61
62void
63boot(dev_t bootdev)
64{
65 int fd, isupgrade = 0;
66 int i, try = 0, st;
67 uint64_t marks[MARK_MAX];
68
69 machdep();
70
71 snprintf(prog_ident, sizeof(prog_ident),
72 ">> OpenBSD/" MACHINE " %s %s", progname, version);
73
74 printf(">> ");
75 colorchar('O', COLOR_DEFAULT_BG, COLOR_BRIGHT_YELLOW);
76 colorchar('p', COLOR_DEFAULT_BG, COLOR_BRIGHT_YELLOW);
77 colorchar('e', COLOR_DEFAULT_BG, COLOR_BRIGHT_YELLOW);
78 colorchar('n', COLOR_DEFAULT_BG, COLOR_BRIGHT_YELLOW);
79 colorchar('B', COLOR_DEFAULT_BG, COLOR_RED);
80 colorchar('S', COLOR_DEFAULT_BG, COLOR_RED);
81 colorchar('D', COLOR_DEFAULT_BG, COLOR_RED);
82
83 colorchar('/', COLOR_DEFAULT_BG, COLOR_DEFAULT_FG);
84
85 for (i = 0; i < strlen(MACHINE); i++)
86 colorchar(MACHINE[i], COLOR_DEFAULT_BG, COLOR_BRIGHT_WHITE);
87
88 printf(" %s %s\n", progname, version);
89
90 devboot(bootdev, cmd.bootdev);
91 strlcpy(cmd.image, kernelfile, sizeof(cmd.image));
92 cmd.boothowto = 0;
93 cmd.conf = "/etc/boot.conf";
94 cmd.timeout = boottimeout;
95
96 if (upgrade()) {
97 strlcpy(cmd.image, "/bsd.upgrade", sizeof(cmd.image));
98 printf("upgrade detected: switching to %s\n", cmd.image);
99 isupgrade = 1;
100 }
101
102 st = read_conf();
103
104#ifdef HIBERNATE
105 int bootdev_has_hibernate(void);
106
107 if (bootdev_has_hibernate()) {
108 strlcpy(cmd.image, "/bsd.booted", sizeof(cmd.image));
109 printf("unhibernate detected: switching to %s\n", cmd.image);
110 cmd.boothowto |= RB_UNHIBERNATE;
111 }
112#endif
113
114 if (!bootprompt)
115 snprintf(cmd.path, sizeof cmd.path, "%s:%s",
116 cmd.bootdev, cmd.image);
117
118 while (1) {
119 /* no boot.conf, or no boot cmd in there */
120 if (bootprompt && st <= 0) {
121 do {
122 printf("boot> ");
123 } while(!getcmd());
124 }
125
126 if (loadrandom(BOOTRANDOM, rnddata, sizeof(rnddata)) == 0)
127 cmd.boothowto |= RB_GOODRANDOM;
128#ifdef MDRANDOM
129 if (mdrandom(rnddata, sizeof(rnddata)) == 0)
130 cmd.boothowto |= RB_GOODRANDOM;
131#endif
132#ifdef FWRANDOM
133 if (fwrandom(rnddata, sizeof(rnddata)) == 0)
134 cmd.boothowto |= RB_GOODRANDOM;
135#endif
136 rc4_keysetup(&randomctx, rnddata, sizeof rnddata);
137 rc4_skip(&randomctx, 1536);
138
139 st = 0;
140 bootprompt = 1; /* allow reselect should we fail */
141
142 printf("booting %s: ", cmd.path);
143 marks[MARK_START] = 0;
144 if ((fd = loadfile(cmd.path, marks, LOAD_ALL)) != -1) {
145
146 /* Prevent re-upgrade: chmod a-x bsd.upgrade */
147 if (isupgrade) {
148 struct stat st;
149
150 if (fstat(fd, &st) == 0) {
151 st.st_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
152 if (fchmod(fd, st.st_mode) == -1)
153 printf("fchmod a-x %s: failed\n",
154 cmd.path);
155 }
156 }
157 close(fd);
158 break;
159 }
160
161 kernelfile = KERNEL;
162 try++;
163 strlcpy(cmd.image, kernelfile, sizeof(cmd.image));
164 printf(" failed(%d). will try %s\n", errno, kernelfile);
165
166 if (try < 2) {
167 if (cmd.timeout > 0)
168 cmd.timeout++;
169 } else {
170 if (cmd.timeout)
171 printf("Turning timeout off.\n");
172 cmd.timeout = 0;
173 }
174 }
175
176 /* exec */
177 run_loadfile(marks, cmd.boothowto);
178}
179
180int
181loadrandom(char *name, char *buf, size_t buflen)
182{
183 char path[MAXPATHLEN];
184 struct stat sb;
185 int fd, i, error = 0;
186
187 /* Extract the device name from the kernel we are loading. */
188 for (i = 0; i < sizeof(cmd.path); i++) {
189 if (cmd.path[i] == ':') {
190 strlcpy(path, cmd.path, i + 1);
191 snprintf(path + i, sizeof(path) - i, ":%s", name);
192 break;
193 } else if (cmd.path[i] == '\0') {
194 snprintf(path, sizeof path, "%s:%s",
195 cmd.bootdev, name);
196 break;
197 }
198 }
199
200 fd = open(path, O_RDONLY);
201 if (fd == -1) {
202 if (errno != EPERM)
203 printf("cannot open %s: %s\n", path, strerror(errno));
204 return -1;
205 }
206 if (fstat(fd, &sb) == -1) {
207 error = -1;
208 goto done;
209 }
210 if (read(fd, buf, buflen) != buflen) {
211 error = -1;
212 goto done;
213 }
214 if (sb.st_mode & S_ISTXT) {
215 printf("NOTE: random seed is being reused.\n");
216 error = -1;
217 goto done;
218 }
219 fchmod(fd, sb.st_mode | S_ISTXT);
220done:
221 close(fd);
222 return (error);
223}