diff options
Diffstat (limited to 'libtar/block.c')
| -rw-r--r-- | libtar/block.c | 68 |
1 files changed, 48 insertions, 20 deletions
diff --git a/libtar/block.c b/libtar/block.c index 8b2205933..d0adb2bcd 100644 --- a/libtar/block.c +++ b/libtar/block.c @@ -18,6 +18,10 @@ # include <stdlib.h> #endif +#ifdef HAVE_EXT4_CRYPT +# include "ext4crypt_tar.h" +#endif + #define BIT_ISSET(bitmask, bit) ((bitmask) & (bit)) // Used to identify selinux_context in extended ('x') @@ -138,9 +142,8 @@ th_read(TAR *t) if (t->th_buf.selinux_context != NULL) free(t->th_buf.selinux_context); #ifdef HAVE_EXT4_CRYPT - if (t->th_buf.e4crypt_policy != NULL) { - free(t->th_buf.e4crypt_policy); - } + if (t->th_buf.eep != NULL) + free(t->th_buf.eep); #endif if (t->th_buf.has_cap_data) { @@ -345,16 +348,40 @@ th_read(TAR *t) start = strstr(buf, E4CRYPT_TAG); if (start && start+E4CRYPT_TAG_LEN < buf+len) { + t->th_buf.eep = (struct ext4_encryption_policy*)malloc(sizeof(struct ext4_encryption_policy)); + if (!t->th_buf.eep) { + printf("malloc ext4_encryption_policy\n"); + return -1; + } start += E4CRYPT_TAG_LEN; - char *end = strchr(start, '\n'); - if(!end) - end = strchr(start, '\0'); - if(end) + if (*start == '2') + { + start++; + if (start + sizeof(struct ext4_encryption_policy) != '\n') + printf("did not find newline char in expected location, continuing anyway...\n"); + memcpy(t->th_buf.eep, start, sizeof(struct ext4_encryption_policy)); +#ifdef DEBUG + printf(" th_read(): E4Crypt policy v2 detected: %i %i %i %i %s\n", + (int)t->th_buf.eep->version, + (int)t->th_buf.eep->contents_encryption_mode, + (int)t->th_buf.eep->filenames_encryption_mode, + (int)t->th_buf.eep->flags, + t->th_buf.eep->master_key_descriptor); +#endif + } + else { - t->th_buf.e4crypt_policy = strndup(start, end-start); + e4crypt_policy_fill_default_struct(t->th_buf.eep); + char *end = strchr(start, '\n'); + if(!end) + end = strchr(start, '\0'); + if(end) + { + strncpy(t->th_buf.eep->master_key_descriptor, start, end-start); #ifdef DEBUG - printf(" th_read(): E4Crypt policy detected: %s\n", t->th_buf.e4crypt_policy); + printf(" th_read(): E4Crypt policy v1 detected: %s\n", t->th_buf.eep->master_key_descriptor); #endif + } } } #endif // HAVE_EXT4_CRYPT @@ -557,22 +584,22 @@ th_write(TAR *t) } #ifdef HAVE_EXT4_CRYPT - if((t->options & TAR_STORE_EXT4_POL) && t->th_buf.e4crypt_policy != NULL) + if((t->options & TAR_STORE_EXT4_POL) && t->th_buf.eep != NULL) { #ifdef DEBUG printf("th_write(): using e4crypt_policy %s\n", - t->th_buf.e4crypt_policy); + t->th_buf.eep->master_key_descriptor); #endif - /* setup size - EXT header has format "*size of this whole tag as ascii numbers* *space* *content* *newline* */ + /* setup size - EXT header has format "*size of this whole tag as ascii numbers* *space* *version code* *content* *newline* */ // size newline - sz = E4CRYPT_TAG_LEN + strlen(t->th_buf.e4crypt_policy) + 3 + 1; + sz = E4CRYPT_TAG_LEN + sizeof(struct ext4_encryption_policy) + 1 + 3 + 1; if(sz >= 100) // another ascci digit for size ++sz; if (total_sz + sz >= T_BLOCKSIZE) { - if (th_write_extended(t, &buf, total_sz)) + if (th_write_extended(t, &buf[0], total_sz)) return -1; ptr = buf; total_sz = sz; @@ -580,7 +607,8 @@ th_write(TAR *t) else total_sz += sz; - snprintf(ptr, T_BLOCKSIZE, "%d "E4CRYPT_TAG"%s", (int)sz, t->th_buf.e4crypt_policy); + snprintf(ptr, T_BLOCKSIZE, "%d "E4CRYPT_TAG"2", (int)sz); + memcpy(ptr + sz - sizeof(struct ext4_encryption_policy) - 1, t->th_buf.eep, sizeof(struct ext4_encryption_policy)); char *nlptr = ptr + sz - 1; *nlptr = '\n'; ptr += sz; @@ -599,7 +627,7 @@ th_write(TAR *t) if (total_sz + sz >= T_BLOCKSIZE) { - if (th_write_extended(t, &buf, total_sz)) + if (th_write_extended(t, &buf[0], total_sz)) return -1; ptr = buf; total_sz = sz; @@ -623,7 +651,7 @@ th_write(TAR *t) if (total_sz + sz >= T_BLOCKSIZE) { - if (th_write_extended(t, &buf, total_sz)) + if (th_write_extended(t, &buf[0], total_sz)) return -1; ptr = buf; total_sz = sz; @@ -644,7 +672,7 @@ th_write(TAR *t) if (total_sz + sz >= T_BLOCKSIZE) { - if (th_write_extended(t, &buf, total_sz)) + if (th_write_extended(t, &buf[0], total_sz)) return -1; ptr = buf; total_sz = sz; @@ -665,7 +693,7 @@ th_write(TAR *t) if (total_sz + sz >= T_BLOCKSIZE) { - if (th_write_extended(t, &buf, total_sz)) + if (th_write_extended(t, &buf[0], total_sz)) return -1; ptr = buf; total_sz = sz; @@ -679,7 +707,7 @@ th_write(TAR *t) ptr += sz; } } - if (total_sz > 0 && th_write_extended(t, &buf, total_sz)) // write any outstanding tar extended header + if (total_sz > 0 && th_write_extended(t, &buf[0], total_sz)) // write any outstanding tar extended header return -1; th_finish(t); |