djm@openbsd.org | de40876 | 2020-01-25 23:28:06 +0000 | [diff] [blame] | 1 | /* $OpenBSD: sshbuf-io.c,v 1.2 2020/01/25 23:28:06 djm Exp $ */ |
djm@openbsd.org | 99aa803 | 2020-01-25 23:02:13 +0000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 2011 Damien Miller |
| 4 | * |
| 5 | * Permission to use, copy, modify, and distribute this software for any |
| 6 | * purpose with or without fee is hereby granted, provided that the above |
| 7 | * copyright notice and this permission notice appear in all copies. |
| 8 | * |
| 9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 16 | */ |
| 17 | |
| 18 | #include "includes.h" |
| 19 | |
| 20 | #include <sys/types.h> |
| 21 | #include <sys/stat.h> |
| 22 | |
| 23 | #include <errno.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <unistd.h> |
| 26 | #include <string.h> |
| 27 | |
| 28 | #include "ssherr.h" |
djm@openbsd.org | 99aa803 | 2020-01-25 23:02:13 +0000 | [diff] [blame] | 29 | #include "sshbuf.h" |
| 30 | #include "atomicio.h" |
| 31 | |
| 32 | /* Load a file from a fd into a buffer */ |
| 33 | int |
| 34 | sshbuf_load_fd(int fd, struct sshbuf **blobp) |
| 35 | { |
| 36 | u_char buf[4096]; |
| 37 | size_t len; |
| 38 | struct stat st; |
| 39 | int r; |
| 40 | struct sshbuf *blob; |
| 41 | |
| 42 | *blobp = NULL; |
| 43 | |
| 44 | if (fstat(fd, &st) == -1) |
| 45 | return SSH_ERR_SYSTEM_ERROR; |
| 46 | if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 && |
| 47 | st.st_size > SSHBUF_SIZE_MAX) |
| 48 | return SSH_ERR_INVALID_FORMAT; |
| 49 | if ((blob = sshbuf_new()) == NULL) |
| 50 | return SSH_ERR_ALLOC_FAIL; |
| 51 | for (;;) { |
| 52 | if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) { |
| 53 | if (errno == EPIPE) |
| 54 | break; |
| 55 | r = SSH_ERR_SYSTEM_ERROR; |
| 56 | goto out; |
| 57 | } |
| 58 | if ((r = sshbuf_put(blob, buf, len)) != 0) |
| 59 | goto out; |
| 60 | if (sshbuf_len(blob) > SSHBUF_SIZE_MAX) { |
| 61 | r = SSH_ERR_INVALID_FORMAT; |
| 62 | goto out; |
| 63 | } |
| 64 | } |
| 65 | if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 && |
| 66 | st.st_size != (off_t)sshbuf_len(blob)) { |
| 67 | r = SSH_ERR_FILE_CHANGED; |
| 68 | goto out; |
| 69 | } |
| 70 | /* success */ |
| 71 | *blobp = blob; |
| 72 | blob = NULL; /* transferred */ |
| 73 | r = 0; |
| 74 | out: |
| 75 | explicit_bzero(buf, sizeof(buf)); |
| 76 | sshbuf_free(blob); |
| 77 | return r; |
| 78 | } |
| 79 | |
| 80 | int |
| 81 | sshbuf_load_file(const char *path, struct sshbuf **bufp) |
| 82 | { |
| 83 | int r, fd, oerrno; |
| 84 | |
| 85 | *bufp = NULL; |
| 86 | if ((fd = open(path, O_RDONLY)) == -1) |
| 87 | return SSH_ERR_SYSTEM_ERROR; |
| 88 | if ((r = sshbuf_load_fd(fd, bufp)) != 0) |
| 89 | goto out; |
| 90 | /* success */ |
| 91 | r = 0; |
| 92 | out: |
| 93 | oerrno = errno; |
| 94 | close(fd); |
| 95 | if (r != 0) |
| 96 | errno = oerrno; |
| 97 | return r; |
| 98 | } |
| 99 | |
| 100 | int |
| 101 | sshbuf_write_file(const char *path, struct sshbuf *buf) |
| 102 | { |
| 103 | int fd, oerrno; |
| 104 | |
| 105 | if ((fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644)) == -1) |
| 106 | return SSH_ERR_SYSTEM_ERROR; |
| 107 | if (atomicio(vwrite, fd, sshbuf_mutable_ptr(buf), |
| 108 | sshbuf_len(buf)) != sshbuf_len(buf) || close(fd) != 0) { |
| 109 | oerrno = errno; |
| 110 | close(fd); |
| 111 | unlink(path); |
| 112 | errno = oerrno; |
| 113 | return SSH_ERR_SYSTEM_ERROR; |
| 114 | } |
| 115 | return 0; |
| 116 | } |
| 117 | |