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#include <sys/resource.h> |
#include <sys/resource.h> |
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#include "config.h" |
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#include "imapfilter.h" |
#include "imapfilter.h" |
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extern unsigned int options; |
extern unsigned int options; |
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#ifdef MEMORY_LOCK |
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extern uid_t ruid, euid; |
extern uid_t ruid, euid; |
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#endif |
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static secmem_t *smem = NULL; /* First node of secure memory linked list. */ |
static secmem_t *smem = NULL; /* First node of secure memory linked list. */ |
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*/ |
*/ |
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void *smalloc(size_t size) |
void *smalloc(size_t size) |
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{ |
{ |
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#ifdef MEMORY_LOCK |
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int r; |
int r; |
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void *ptr; |
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static int w = 0; |
static int w = 0; |
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#endif |
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void *ptr; |
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secmem_t *node; |
secmem_t *node; |
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ptr = xmalloc(size); |
ptr = xmalloc(size); |
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#ifdef MEMORY_LOCK |
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seteuid(euid); /* Gain root privileges. */ |
seteuid(euid); /* Gain root privileges. */ |
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r = mlock(ptr, size); |
r = mlock(ptr, size); |
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seteuid(ruid); /* Drop root privileges. */ |
seteuid(ruid); /* Drop root privileges. */ |
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if (getuid() != geteuid()) |
if (getuid() != geteuid()) |
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fatal(ERROR_SETUID, "imapfilter: failed to drop privileges\n"); |
fatal(ERROR_SETUID, "imapfilter: failed to drop privileges\n"); |
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if (options & OPTION_WARNING && r && !w) { |
if (options & OPTION_WARNING && r && !w) { |
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error("imapfilter: warning: using insecure memory\n"); |
error("imapfilter: warning: using insecure memory\n"); |
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w = 1; |
w = 1; |
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} |
} |
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#endif |
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node = (secmem_t *) xmalloc(sizeof(secmem_t)); |
node = (secmem_t *) xmalloc(sizeof(secmem_t)); |
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node->buf = ptr; |
node->buf = ptr; |
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xfree(ptr); |
xfree(ptr); |
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return; |
return; |
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} |
} |
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memset(node->buf, 0, node->size); |
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memset(node->buf, 0, node->size); |
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secmem_remove(node); |
secmem_remove(node); |
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xfree(node->buf); |
xfree(node->buf); |
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xfree(node); |
xfree(node); |
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node->prev->next = node->next; |
node->prev->next = node->next; |
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if (node->next) |
if (node->next) |
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node->next->prev = node->prev; |
node->next->prev = node->prev; |
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if (smem == node) |
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smem = node->next; |
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} |
} |
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*/ |
*/ |
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void secmem_clear(void) |
void secmem_clear(void) |
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{ |
{ |
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secmem_t *p; |
secmem_t *p, *t; |
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for (p = smem; p; p = p->next) |
for (p = smem; p; p = t) { |
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sfree(p); |
t = p->next; |
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sfree(p->buf); |
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} |
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} |
} |
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#ifdef MEMORY_LOCK |
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/* |
/* |
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* Lock memory of allocated buffers. |
* Lock memory of allocated buffers. |
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*/ |
*/ |
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fatal(ERROR_SETUID, "imapfilter: failed to drop privileges\n"); |
fatal(ERROR_SETUID, "imapfilter: failed to drop privileges\n"); |
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} |
} |
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#endif |
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/* |
/* |
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* Disable core file dumping. |
* Disable core file dumping. |