sbase/libutil/crypt.c

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C
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/* See LICENSE file for copyright and license details. */
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../crypt.h"
#include "../text.h"
#include "../util.h"
static int
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hexdec(int c)
{
if (c >= '0' && c <= '9')
return c - '0';
else if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
else if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
return -1; /* unknown character */
}
static int
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mdcheckline(const char *s, uint8_t *md, size_t sz)
{
size_t i;
int b1, b2;
for (i = 0; i < sz; i++) {
if (!*s || (b1 = hexdec(*s++)) < 0)
return -1; /* invalid format */
if (!*s || (b2 = hexdec(*s++)) < 0)
return -1; /* invalid format */
if ((uint8_t)((b1 << 4) | b2) != md[i])
return 0; /* value mismatch */
}
return (i == sz) ? 1 : 0;
}
static void
mdchecklist(FILE *listfp, struct crypt_ops *ops, uint8_t *md, size_t sz,
int *formatsucks, int *noread, int *nonmatch)
{
int fd;
size_t bufsiz = 0;
int r;
char *line = NULL, *file, *p;
while (getline(&line, &bufsiz, listfp) > 0) {
if (!(file = strstr(line, " "))) {
(*formatsucks)++;
continue;
}
if ((file - line) / 2 != sz) {
(*formatsucks)++; /* checksum length mismatch */
continue;
}
*file = '\0';
file += 2;
for (p = file; *p && *p != '\n' && *p != '\r'; p++); /* strip newline */
*p = '\0';
if ((fd = open(file, O_RDONLY)) < 0) {
weprintf("open %s:", file);
(*noread)++;
continue;
}
if (cryptsum(ops, fd, file, md)) {
(*noread)++;
continue;
}
r = mdcheckline(line, md, sz);
if (r == 1) {
printf("%s: OK\n", file);
} else if (r == 0) {
printf("%s: FAILED\n", file);
(*nonmatch)++;
} else {
(*formatsucks)++;
}
close(fd);
}
free(line);
}
int
cryptcheck(int argc, char *argv[], struct crypt_ops *ops, uint8_t *md, size_t sz)
{
FILE *fp;
int formatsucks = 0, noread = 0, nonmatch = 0, ret = 0;
if (argc == 0) {
mdchecklist(stdin, ops, md, sz, &formatsucks, &noread, &nonmatch);
} else {
for (; *argv; argc--, argv++) {
if ((*argv)[0] == '-' && !(*argv)[1]) {
fp = stdin;
} else if (!(fp = fopen(*argv, "r"))) {
weprintf("fopen %s:", *argv);
ret = 1;
continue;
}
mdchecklist(fp, ops, md, sz, &formatsucks, &noread, &nonmatch);
if (fp != stdin)
fclose(fp);
}
}
if (formatsucks) {
weprintf("%d lines are improperly formatted\n", formatsucks);
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ret = 1;
}
if (noread) {
weprintf("%d listed file could not be read\n", noread);
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ret = 1;
}
if (nonmatch) {
weprintf("%d computed checksums did NOT match\n", nonmatch);
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ret = 1;
}
return ret;
}
int
cryptmain(int argc, char *argv[], struct crypt_ops *ops, uint8_t *md, size_t sz)
{
int fd;
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int ret = 0;
if (argc == 0) {
if (cryptsum(ops, 0, "<stdin>", md))
ret = 1;
else
mdprint(md, "<stdin>", sz);
} else {
for (; *argv; argc--, argv++) {
if ((*argv)[0] == '-' && !(*argv)[1]) {
*argv = "<stdin>";
fd = 0;
} else if ((fd = open(*argv, O_RDONLY)) < 0) {
weprintf("open %s:", *argv);
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ret = 1;
continue;
}
if (cryptsum(ops, fd, *argv, md))
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ret = 1;
else
mdprint(md, *argv, sz);
if (fd != 0)
close(fd);
}
}
return ret;
}
int
cryptsum(struct crypt_ops *ops, int fd, const char *f, uint8_t *md)
{
uint8_t buf[BUFSIZ];
ssize_t n;
ops->init(ops->s);
while ((n = read(fd, buf, sizeof(buf))) > 0)
ops->update(ops->s, buf, n);
if (n < 0) {
weprintf("%s: read error:", f);
return 1;
}
ops->sum(ops->s, md);
return 0;
}
void
mdprint(const uint8_t *md, const char *f, size_t len)
{
size_t i;
for (i = 0; i < len; i++)
printf("%02x", md[i]);
printf(" %s\n", f);
}