diff options
Diffstat (limited to 'wgtpkg-zip.c')
| -rw-r--r-- | wgtpkg-zip.c | 53 |
1 files changed, 39 insertions, 14 deletions
diff --git a/wgtpkg-zip.c b/wgtpkg-zip.c index 98501ff..6ca321f 100644 --- a/wgtpkg-zip.c +++ b/wgtpkg-zip.c @@ -38,8 +38,28 @@ #define MODE_OF_DIRECTORY_CREATION 0750 #endif +static int is_valid_filename(const char *filename) +{ + int lastsp = 0; + int index = 0; + unsigned char c; + + c = (unsigned char)filename[index]; + while (c) { + if ((c < 0x1f) + || ((lastsp = (c == 0x20)) && index == 0) + || c == 0x7f || c == 0x3c || c == 0x3e + || c == 0x3a || c == 0x22 || c == 0x2f + || c == 0x5c || c == 0x7c || c == 0x3f + || c == 0x2a || c == 0x5e || c == 0x60 + || c == 0x7b || c == 0x7d || c == 0x21) + return 0; + c = (unsigned char)filename[++index]; + } + return !lastsp; +} -int create_directory(char *file, int mode) +static int create_directory(char *file, int mode) { int rc; char *last = strrchr(file, '/'); @@ -62,7 +82,7 @@ int create_directory(char *file, int mode) return rc; } -int create_file(char *file, int fmode, int dmode) +static int create_file(char *file, int fmode, int dmode) { int fd = creat(file, fmode); if (fd < 0 && errno == ENOENT) { @@ -108,6 +128,10 @@ int zread(const char *zipfile, unsigned long long maxsize) for (index = 0 ; index < count ; index++) { err = zip_stat_index(zip, index, ZIP_FL_ENC_GUESS, &zstat); /* check the file name */ + if (!is_valid_filename(zstat.name)) { + syslog(LOG_ERR, "invalid entry %s found in %s", zstat.name, zipfile); + goto error; + } if (zstat.name[0] == '/') { syslog(LOG_ERR, "absolute entry %s found in %s", zstat.name, zipfile); goto error; @@ -233,39 +257,37 @@ static int zwr(struct zws *zws, int offset) (ent->d_name[1] == '.' && len == 2))) ; else if (offset + len >= sizeof(zws->name)) { - closedir(dir); syslog(LOG_ERR, "name too long in zwr"); errno = ENAMETOOLONG; - return -1; + goto error; } else { memcpy(zws->name + offset, ent->d_name, 1+len); + if (!is_valid_filename(ent->d_name)) { + syslog(LOG_ERR, "invalid name %s", zws->name); + goto error; + } switch (ent->d_type) { case DT_DIR: z64 = zip_dir_add(zws->zip, zws->name, ZIP_FL_ENC_UTF_8); if (z64 < 0) { syslog(LOG_ERR, "zip_dir_add of %s failed", zws->name); - closedir(dir); - return -1; + goto error; } err = zwr(zws, offset + len); - if (err) { - closedir(dir); - return -1; - } + if (err) + goto error; break; case DT_REG: zsrc = zip_source_file(zws->zip, zws->name, 0, 0); if (zsrc == NULL) { syslog(LOG_ERR, "zip_source_file of %s failed", zws->name); - closedir(dir); - return -1; + goto error; } z64 = zip_file_add(zws->zip, zws->name, zsrc, ZIP_FL_ENC_UTF_8); if (z64 < 0) { syslog(LOG_ERR, "zip_file_add of %s failed", zws->name); zip_source_free(zsrc); - closedir(dir); - return -1; + goto error; } break; default: @@ -277,6 +299,9 @@ static int zwr(struct zws *zws, int offset) closedir(dir); return 0; +error: + closedir(dir); + return -1; } /* write (pack) content of the current directory in 'zipfile' */ |