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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#include "swissknife_capabilities.h" |
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#include <errno.h> |
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#include <sys/capability.h> |
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#include <cassert> |
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#include "util/logging.h" |
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namespace swissknife { |
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bool ObtainDacReadSearchCapability() { |
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cap_value_t cap = CAP_DAC_READ_SEARCH; |
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#ifdef CAP_IS_SUPPORTED |
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assert(CAP_IS_SUPPORTED(cap)); |
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#endif |
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cap_t caps_proc = cap_get_proc(); |
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assert(caps_proc != NULL); |
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cap_flag_value_t cap_state; |
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int retval = cap_get_flag(caps_proc, cap, CAP_EFFECTIVE, &cap_state); |
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assert(retval == 0); |
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if (cap_state == CAP_SET) { |
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cap_free(caps_proc); |
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return true; |
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} |
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retval = cap_get_flag(caps_proc, cap, CAP_PERMITTED, &cap_state); |
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assert(retval == 0); |
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if (cap_state != CAP_SET) { |
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LogCvmfs(kLogCvmfs, kLogStdout, |
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"Warning: CAP_DAC_READ_SEARCH cannot be obtained. " |
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"It's not in the process's permitted set."); |
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cap_free(caps_proc); |
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return false; |
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} |
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retval = cap_set_flag(caps_proc, CAP_EFFECTIVE, 1, &cap, CAP_SET); |
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assert(retval == 0); |
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retval = cap_set_proc(caps_proc); |
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cap_free(caps_proc); |
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if (retval != 0) { |
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LogCvmfs(kLogCvmfs, kLogStderr, |
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"Cannot reset capabilities for current process " |
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"(errno: %d)", |
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errno); |
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return false; |
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} |
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return true; |
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} |
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} // namespace swissknife |
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