1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <stdio.h>
27 #include <string.h>
28 #include <fcntl.h>
29 #include <sys/types.h>
30 #include <sys/stat.h>
31 #include <errno.h>
32 #include <locale.h>
33 #include <cryptoutil.h>
34
35 /*
36 * Read file into buffer. Used to read raw key data or initialization
37 * vector data. Buffer must be freed by caller using free().
38 *
39 * If file is a regular file, entire file is read and dlen is set
40 * to the number of bytes read. Otherwise, dlen should first be set
41 * to the number of bytes requested and will be reset to actual number
42 * of bytes returned.
43 *
44 * Return 0 on success and errno on error.
45 */
46 int
pkcs11_read_data(char * filename,void ** dbuf,size_t * dlen)47 pkcs11_read_data(char *filename, void **dbuf, size_t *dlen)
48 {
49 int fd = -1;
50 struct stat statbuf;
51 boolean_t plain_file;
52 void *filebuf = NULL;
53 size_t filesize = 0;
54 int ret = 0;
55
56 if (filename == NULL || dbuf == NULL || dlen == NULL)
57 return (-1);
58
59 if ((fd = open(filename, O_RDONLY | O_NONBLOCK)) == -1) {
60 ret = errno;
61 cryptoerror(LOG_STDERR, gettext("cannot open %s"), filename);
62 goto error;
63 }
64
65 if (fstat(fd, &statbuf) == -1) {
66 ret = errno;
67 cryptoerror(LOG_STDERR, gettext("cannot stat %s"), filename);
68 goto error;
69 }
70
71 if (S_ISREG(statbuf.st_mode)) {
72 /* read the entire regular file */
73 filesize = statbuf.st_size;
74 plain_file = B_TRUE;
75 } else {
76 /* read requested bytes from special file */
77 filesize = *dlen;
78 plain_file = B_FALSE;
79 }
80
81 if (filesize == 0) {
82 /*
83 * for decrypt this is an error; for digest this is ok;
84 * make it ok here but also set dbuf = NULL and dlen = 0
85 * to indicate there was no data to read and caller can
86 * retranslate that to an error if it wishes.
87 */
88 (void) close(fd);
89 *dbuf = NULL;
90 *dlen = 0;
91 return (0);
92 }
93
94 if ((filebuf = malloc(filesize)) == NULL) {
95 ret = errno;
96 cryptoerror(LOG_STDERR, gettext("malloc: %s"), strerror(ret));
97 goto error;
98 }
99
100 if (plain_file) {
101 /* either it got read or it didn't */
102 if (read(fd, filebuf, filesize) != filesize) {
103 ret = errno;
104 cryptoerror(LOG_STDERR,
105 gettext("error reading file %s: %s"), filename,
106 strerror(ret));
107 goto error;
108 }
109 } else {
110 /* reading from special file may need some coaxing */
111 char *marker = (char *)filebuf;
112 size_t left = filesize;
113 ssize_t nread;
114
115 for (/* */; left > 0; marker += nread, left -= nread) {
116 /* keep reading it's going well */
117 nread = read(fd, marker, left);
118 if (nread > 0 || (nread == 0 && errno == EINTR)) {
119 errno = 0;
120 continue;
121 }
122
123 /* might have to be good enough for caller */
124 if (nread == 0 && errno == EAGAIN)
125 break;
126
127 /* anything else is an error */
128 if (errno) {
129 ret = errno;
130 cryptoerror(LOG_STDERR,
131 gettext("error reading file %s: %s"),
132 filename, strerror(ret));
133 goto error;
134 }
135 }
136 /* reset to actual number of bytes read */
137 filesize -= left;
138 }
139
140 (void) close(fd);
141 *dbuf = filebuf;
142 *dlen = filesize;
143 return (0);
144
145 error:
146 if (fd != -1)
147 (void) close(fd);
148
149 return (ret);
150 }
151