diff options
Diffstat (limited to 'source3/libsmb/asn1.c')
| -rw-r--r-- | source3/libsmb/asn1.c | 603 |
1 files changed, 0 insertions, 603 deletions
diff --git a/source3/libsmb/asn1.c b/source3/libsmb/asn1.c deleted file mode 100644 index aca1c48841..0000000000 --- a/source3/libsmb/asn1.c +++ /dev/null @@ -1,603 +0,0 @@ -/* - Unix SMB/CIFS implementation. - simple SPNEGO routines - Copyright (C) Andrew Tridgell 2001 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see <http://www.gnu.org/licenses/>. -*/ - -#include "includes.h" - -/* free an asn1 structure */ -void asn1_free(ASN1_DATA *data) -{ - struct nesting *nesting = data->nesting; - - while (nesting) { - struct nesting *nnext = nesting->next; - free(nesting); - nesting = nnext; - }; - data->nesting = NULL; - SAFE_FREE(data->data); -} - -/* write to the ASN1 buffer, advancing the buffer pointer */ -bool asn1_write(ASN1_DATA *data, const void *p, int len) -{ - if (data->has_error) return false; - if (data->length < data->ofs+len) { - data->data = SMB_REALLOC_ARRAY(data->data, unsigned char, - data->ofs+len); - if (!data->data) { - data->has_error = true; - return false; - } - data->length = data->ofs+len; - } - memcpy(data->data + data->ofs, p, len); - data->ofs += len; - return true; -} - -/* useful fn for writing a uint8 */ -bool asn1_write_uint8(ASN1_DATA *data, uint8 v) -{ - return asn1_write(data, &v, 1); -} - -/* push a tag onto the asn1 data buffer. Used for nested structures */ -bool asn1_push_tag(ASN1_DATA *data, uint8 tag) -{ - struct nesting *nesting; - - asn1_write_uint8(data, tag); - nesting = SMB_MALLOC_P(struct nesting); - if (!nesting) { - data->has_error = true; - return false; - } - - nesting->start = data->ofs; - nesting->next = data->nesting; - data->nesting = nesting; - return asn1_write_uint8(data, 0xff); -} - -/* pop a tag */ -bool asn1_pop_tag(ASN1_DATA *data) -{ - struct nesting *nesting; - size_t len; - - if (data->has_error) { - return false; - } - - nesting = data->nesting; - - if (!nesting) { - data->has_error = true; - return false; - } - len = data->ofs - (nesting->start+1); - /* yes, this is ugly. We don't know in advance how many bytes the length - of a tag will take, so we assumed 1 byte. If we were wrong then we - need to correct our mistake */ - if (len > 0xFFFF) { - data->data[nesting->start] = 0x83; - if (!asn1_write_uint8(data, 0)) return false; - if (!asn1_write_uint8(data, 0)) return false; - if (!asn1_write_uint8(data, 0)) return false; - memmove(data->data+nesting->start+4, data->data+nesting->start+1, len); - data->data[nesting->start+1] = (len>>16) & 0xFF; - data->data[nesting->start+2] = (len>>8) & 0xFF; - data->data[nesting->start+3] = len&0xff; - } else if (len > 255) { - data->data[nesting->start] = 0x82; - if (!asn1_write_uint8(data, 0)) return false; - if (!asn1_write_uint8(data, 0)) return false; - memmove(data->data+nesting->start+3, data->data+nesting->start+1, len); - data->data[nesting->start+1] = len>>8; - data->data[nesting->start+2] = len&0xff; - } else if (len > 127) { - data->data[nesting->start] = 0x81; - if (!asn1_write_uint8(data, 0)) return false; - memmove(data->data+nesting->start+2, data->data+nesting->start+1, len); - data->data[nesting->start+1] = len; - } else { - data->data[nesting->start] = len; - } - - data->nesting = nesting->next; - free(nesting); - return true; -} - - -/* write an integer */ -bool asn1_write_Integer(ASN1_DATA *data, int i) -{ - if (!asn1_push_tag(data, ASN1_INTEGER)) return false; - do { - asn1_write_uint8(data, i); - i = i >> 8; - } while (i); - return asn1_pop_tag(data); -} - -/* write an object ID to a ASN1 buffer */ -bool asn1_write_OID(ASN1_DATA *data, const char *OID) -{ - unsigned v, v2; - const char *p = (const char *)OID; - char *newp; - - if (!asn1_push_tag(data, ASN1_OID)) - return false; - v = strtol(p, &newp, 10); - p = newp; - v2 = strtol(p, &newp, 10); - p = newp; - if (!asn1_write_uint8(data, 40*v + v2)) - return false; - - while (*p) { - v = strtol(p, &newp, 10); - p = newp; - if (v >= (1<<28)) asn1_write_uint8(data, 0x80 | ((v>>28)&0xff)); - if (v >= (1<<21)) asn1_write_uint8(data, 0x80 | ((v>>21)&0xff)); - if (v >= (1<<14)) asn1_write_uint8(data, 0x80 | ((v>>14)&0xff)); - if (v >= (1<<7)) asn1_write_uint8(data, 0x80 | ((v>>7)&0xff)); - if (!asn1_write_uint8(data, v&0x7f)) - return false; - } - return asn1_pop_tag(data); -} - -/* write an octet string */ -bool asn1_write_OctetString(ASN1_DATA *data, const void *p, size_t length) -{ - asn1_push_tag(data, ASN1_OCTET_STRING); - asn1_write(data, p, length); - asn1_pop_tag(data); - return !data->has_error; -} - -/* write a general string */ -bool asn1_write_GeneralString(ASN1_DATA *data, const char *s) -{ - asn1_push_tag(data, ASN1_GENERAL_STRING); - asn1_write(data, s, strlen(s)); - asn1_pop_tag(data); - return !data->has_error; -} - -/* write a BOOLEAN */ -bool asn1_write_BOOLEAN(ASN1_DATA *data, bool v) -{ - asn1_write_uint8(data, ASN1_BOOLEAN); - asn1_write_uint8(data, v); - return !data->has_error; -} - -/* write a BOOLEAN - hmm, I suspect this one is the correct one, and the - above boolean is bogus. Need to check */ -bool asn1_write_BOOLEAN2(ASN1_DATA *data, bool v) -{ - asn1_push_tag(data, ASN1_BOOLEAN); - asn1_write_uint8(data, v); - asn1_pop_tag(data); - return !data->has_error; -} - -/* check a BOOLEAN */ -bool asn1_check_BOOLEAN(ASN1_DATA *data, bool v) -{ - uint8 b = 0; - - asn1_read_uint8(data, &b); - if (b != ASN1_BOOLEAN) { - data->has_error = true; - return false; - } - asn1_read_uint8(data, &b); - if (b != v) { - data->has_error = true; - return false; - } - return !data->has_error; -} - - -/* load a ASN1_DATA structure with a lump of data, ready to be parsed */ -bool asn1_load(ASN1_DATA *data, DATA_BLOB blob) -{ - ZERO_STRUCTP(data); - data->data = (unsigned char *)memdup(blob.data, blob.length); - if (!data->data) { - data->has_error = true; - return false; - } - data->length = blob.length; - return true; -} - -/* read from a ASN1 buffer, advancing the buffer pointer */ -bool asn1_read(ASN1_DATA *data, void *p, int len) -{ - if (data->has_error) - return false; - - if (len < 0 || data->ofs + len < data->ofs || data->ofs + len < len) { - data->has_error = true; - return false; - } - - if (data->ofs + len > data->length) { - data->has_error = true; - return false; - } - memcpy(p, data->data + data->ofs, len); - data->ofs += len; - return true; -} - -/* read a uint8 from a ASN1 buffer */ -bool asn1_read_uint8(ASN1_DATA *data, uint8 *v) -{ - return asn1_read(data, v, 1); -} - -/* - * Check thta the value of the ASN1 buffer at the current offset equals tag. - */ -bool asn1_check_tag(ASN1_DATA *data, uint8 tag) -{ - if (data->has_error || data->ofs >= data->length || data->ofs < 0) { - data->has_error = true; - return false; - } - - return (tag == data->data[data->ofs]); -} - -/* start reading a nested asn1 structure */ -bool asn1_start_tag(ASN1_DATA *data, uint8 tag) -{ - uint8 b; - struct nesting *nesting; - - if (!asn1_read_uint8(data, &b)) - return false; - - if (b != tag) { - data->has_error = true; - return false; - } - nesting = SMB_MALLOC_P(struct nesting); - if (!nesting) { - data->has_error = true; - return false; - } - - if (!asn1_read_uint8(data, &b)) { - SAFE_FREE(nesting); - return false; - } - - if (b & 0x80) { - int n = b & 0x7f; - if (!asn1_read_uint8(data, &b)) { - SAFE_FREE(nesting); - return false; - } - nesting->taglen = b; - while (n > 1) { - if (!asn1_read_uint8(data, &b)) { - SAFE_FREE(nesting); - return false; - } - nesting->taglen = (nesting->taglen << 8) | b; - n--; - } - } else { - nesting->taglen = b; - } - nesting->start = data->ofs; - nesting->next = data->nesting; - data->nesting = nesting; - return !data->has_error; -} - - -/* stop reading a tag */ -bool asn1_end_tag(ASN1_DATA *data) -{ - struct nesting *nesting; - - /* make sure we read it all */ - if (asn1_tag_remaining(data) != 0) { - data->has_error = true; - return false; - } - - nesting = data->nesting; - - if (!nesting) { - data->has_error = true; - return false; - } - - data->nesting = nesting->next; - free(nesting); - return true; -} - -/* work out how many bytes are left in this nested tag */ -int asn1_tag_remaining(ASN1_DATA *data) -{ - if (data->has_error) - return 0; - - if (!data->nesting) { - data->has_error = true; - return -1; - } - return data->nesting->taglen - (data->ofs - data->nesting->start); -} - -/* read an object ID from a ASN1 buffer */ -bool asn1_read_OID(ASN1_DATA *data, char **OID) -{ - uint8 b = 0; - char *oid_str = NULL; - - *OID = NULL; - - if (!asn1_start_tag(data, ASN1_OID)) { - return false; - } - asn1_read_uint8(data, &b); - - oid_str = talloc_asprintf(NULL, - "%u", - b/40); - if (!oid_str) { - data->has_error = true; - goto out; - } - oid_str = talloc_asprintf_append(oid_str, - " %u", - b%40); - if (!oid_str) { - data->has_error = true; - goto out; - } - - while (asn1_tag_remaining(data) > 0) { - unsigned v = 0; - do { - asn1_read_uint8(data, &b); - v = (v<<7) | (b&0x7f); - } while (!data->has_error && b & 0x80); - oid_str = talloc_asprintf_append(oid_str, - " %u", - v); - if (!oid_str) { - data->has_error = true; - goto out; - } - } - - out: - - asn1_end_tag(data); - - if (!data->has_error) { - *OID = SMB_STRDUP(oid_str); - } - - TALLOC_FREE(oid_str); - - return !data->has_error; -} - -/* check that the next object ID is correct */ -bool asn1_check_OID(ASN1_DATA *data, const char *OID) -{ - char *id; - - if (!asn1_read_OID(data, &id)) { - return false; - } - - if (strcmp(id, OID) != 0) { - data->has_error = true; - free(id); - return false; - } - free(id); - return true; -} - -/* read a GeneralString from a ASN1 buffer */ -bool asn1_read_GeneralString(ASN1_DATA *data, char **s) -{ - int len; - char *str; - - *s = NULL; - - if (!asn1_start_tag(data, ASN1_GENERAL_STRING)) { - return false; - } - len = asn1_tag_remaining(data); - if (len < 0) { - data->has_error = true; - return false; - } - str = SMB_MALLOC_ARRAY(char, len+1); - if (!str) { - data->has_error = true; - return false; - } - asn1_read(data, str, len); - str[len] = 0; - asn1_end_tag(data); - - if (!data->has_error) { - *s = str; - } - return !data->has_error; -} - -/* read a octet string blob */ -bool asn1_read_OctetString(ASN1_DATA *data, DATA_BLOB *blob) -{ - int len; - ZERO_STRUCTP(blob); - if (!asn1_start_tag(data, ASN1_OCTET_STRING)) return false; - len = asn1_tag_remaining(data); - if (len < 0) { - data->has_error = true; - return false; - } - *blob = data_blob(NULL, len); - asn1_read(data, blob->data, len); - asn1_end_tag(data); - return !data->has_error; -} - -/* read an interger */ -bool asn1_read_Integer(ASN1_DATA *data, int *i) -{ - uint8 b; - *i = 0; - - if (!asn1_start_tag(data, ASN1_INTEGER)) return false; - while (asn1_tag_remaining(data)>0) { - asn1_read_uint8(data, &b); - *i = (*i << 8) + b; - } - return asn1_end_tag(data); - -} - -/* check a enumarted value is correct */ -bool asn1_check_enumerated(ASN1_DATA *data, int v) -{ - uint8 b; - if (!asn1_start_tag(data, ASN1_ENUMERATED)) return false; - asn1_read_uint8(data, &b); - asn1_end_tag(data); - - if (v != b) - data->has_error = false; - - return !data->has_error; -} - -/* write an enumarted value to the stream */ -bool asn1_write_enumerated(ASN1_DATA *data, uint8 v) -{ - if (!asn1_push_tag(data, ASN1_ENUMERATED)) return false; - asn1_write_uint8(data, v); - asn1_pop_tag(data); - return !data->has_error; -} - -bool ber_write_OID_String(DATA_BLOB *blob, const char *OID) -{ - uint_t v, v2; - const char *p = (const char *)OID; - char *newp; - int i; - - v = strtoul(p, &newp, 10); - if (newp[0] != '.') return false; - p = newp + 1; - - v2 = strtoul(p, &newp, 10); - if (newp[0] != '.') return false; - p = newp + 1; - - /*the ber representation can't use more space then the string one */ - *blob = data_blob(NULL, strlen(OID)); - if (!blob->data) return false; - - blob->data[0] = 40*v + v2; - - i = 1; - while (*p) { - v = strtoul(p, &newp, 10); - if (newp[0] == '.') { - p = newp + 1; - } else if (newp[0] == '\0') { - p = newp; - } else { - data_blob_free(blob); - return false; - } - if (v >= (1<<28)) blob->data[i++] = (0x80 | ((v>>28)&0x7f)); - if (v >= (1<<21)) blob->data[i++] = (0x80 | ((v>>21)&0x7f)); - if (v >= (1<<14)) blob->data[i++] = (0x80 | ((v>>14)&0x7f)); - if (v >= (1<<7)) blob->data[i++] = (0x80 | ((v>>7)&0x7f)); - blob->data[i++] = (v&0x7f); - } - - blob->length = i; - - return true; -} - -/* read an object ID from a data blob */ -bool ber_read_OID_String(TALLOC_CTX *mem_ctx, DATA_BLOB blob, const char **OID) -{ - int i; - uint8_t *b; - uint_t v; - char *tmp_oid = NULL; - - if (blob.length < 2) return false; - - b = blob.data; - - tmp_oid = talloc_asprintf(mem_ctx, "%u", b[0]/40); - if (!tmp_oid) goto nomem; - tmp_oid = talloc_asprintf_append_buffer(tmp_oid, ".%u", b[0]%40); - if (!tmp_oid) goto nomem; - - for(i = 1, v = 0; i < blob.length; i++) { - v = (v<<7) | (b[i]&0x7f); - if ( ! (b[i] & 0x80)) { - tmp_oid = talloc_asprintf_append_buffer(tmp_oid, ".%u", v); - v = 0; - } - if (!tmp_oid) goto nomem; - } - - if (v != 0) { - talloc_free(tmp_oid); - return false; - } - - *OID = tmp_oid; - return true; - -nomem: - return false; -} - - |